What are Circuit Protection ?
Circuit Protection refers to components designed to prevent damage to electrical circuits from overcurrent, voltage spikes, and other electrical anomalies. They are commonly used in applications such as production electronics assembly and maintenance. Important specifications include voltage rating, current rating, and response time; these attributes are critical for ensuring compatibility with existing designs and maintaining system performance. Additionally, validating lifecycle status is essential for procurement teams to ensure reliable sourcing.
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| Part & Mfr | Total Stock | Pricing & RFQ | |
|---|---|---|---|
Vishay Dale
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30,000
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Price on request
30,000
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Littelfuse Inc.
<p>The 1SMA17AT3G is a 400W Zener transient voltage suppression (TVS) diode designed for general-purpose circuit protection. It features a standoff voltage of 17V and a clamping voltage of 27.6V, capable of handling peak pulse currents up to 14.5A. The device is unidirectional with a single channel and offers a capacitance of 680pF at 1MHz.</p><p> </p><p>This TVS diode is housed in a DO-214AC (SMA) surface-mount package, suitable for automated assembly. It operates over a wide temperature range of -65°C to 150°C, making it robust for various environments. The Zener technology provides fast response to transient overvoltage events, protecting sensitive electronics.</p><p> </p><p>Typical applications include general-purpose circuit protection in consumer, industrial, and automotive electronics where space is limited. The SMA package allows for compact PCB layouts. Power line protection is not provided, so this device is intended for signal or low-power rail protection.</p>
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30,000
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Price on request
30,000
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Littelfuse Inc.
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30,000
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Price on request
30,000
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STMicroelectronics
<p>The ESDA37W is a dual unidirectional transient voltage suppression (TVS) diode manufactured by STMicroelectronics. It provides ESD protection for sensitive electronics with a reverse standoff voltage of 36V and a peak pulse power rating of 300W (8/20µs waveform).</p><p> </p><p>The device features a peak pulse current of 6.3A under the 8/20µs condition. It offers two unidirectional channels without power line protection, making it suitable for signal line applications. The operating junction temperature range is -40°C to 150°C.</p><p> </p><p>The ESDA37W is offered in a surface-mount SC-70 / SOT-323 package, specifically the SOT-323-3 supplier device package. It is RoHS3 compliant, REACH unaffected, and has an MSL rating of 1 (unlimited floor life).</p><p> </p><p>Designed for general purpose use, this TVS diode is ideal for protecting voltage-sensitive components in consumer, industrial, and telecom systems.</p>
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30,000
|
Price on request
30,000
|
|
Nexperia USA Inc.
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30,000
|
Price on request
30,000
|
|
Littelfuse Inc.
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30,000
|
Price on request
30,000
|
|
Kyocera AVX
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30,000
|
Price on request
30,000
|
|
Littelfuse Inc.
|
30,000
|
Price on request
30,000
|
|
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Littelfuse Inc.
<p>The 1SMA22AT3G is a unidirectional TVS diode manufactured by Littelfuse Inc. It is designed to protect sensitive electronic circuits from voltage transients induced by lightning, inductive load switching, and electrostatic discharge. The device features a reverse standoff voltage of 22V and a clamping voltage of 35.5V, ensuring that downstream components are not exposed to damaging overvoltage conditions.</p><p> </p><p>With a peak pulse power dissipation of 400W and a peak pulse current capability of 11.3A, this diode provides robust transient protection for general-purpose applications. The operating temperature range spans from -65°C to 150°C, allowing reliable performance in harsh environments.</p><p> </p><p>The 1SMA22AT3G is housed in a DO-214AC (SMA) surface-mount package, making it suitable for automated assembly processes. It is RoHS3 compliant and has an MSL rating of 1 (unlimited), simplifying handling and storage requirements. This component is ideal for use in power supplies, industrial controls, and consumer electronics where space-constrained board layouts demand compact protection solutions.</p>
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30,000
|
Price on request
30,000
|
|
On Semiconductor
<p>The 1SMA43AT3G is a unidirectional TVS diode from onsemi designed for general purpose transient voltage suppression. It features a reverse standoff voltage of 43V and a clamping voltage of 69.4V at a peak pulse current of 5.8A. The device can handle 400W of peak pulse power (10/1000μs waveform).</p><p> </p><p>Built with Zener technology, this diode offers single-channel unidirectional protection. Its capacitance is rated at 295pF at 1MHz, making it suitable for low-frequency signal line protection. The part is housed in a standard DO-214AC (SMA) surface-mount package.</p><p> </p><p>Typical applications include voltage spike protection in power supplies, industrial control systems, and general electronic circuits. The device operates over a wide temperature range of -65°C to 150°C.</p>
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30,000
|
Price on request
30,000
|
|
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On Semiconductor
<p>The 1SMA18AT3G is a unidirectional TVS diode from On Semiconductor designed for general purpose circuit protection. It features a reverse standoff voltage of 18V and a clamping voltage of 29.2V at a peak pulse current of 13.7A. With a peak pulse power rating of 400W, it provides robust protection against transient voltage spikes. The device has a capacitance of 645pF at 1MHz and is not intended for power line protection. It is housed in a 6-WDFN exposed pad package (6-TDFN-EP 3x3mm) for surface mount assembly. The operating temperature range is -65°C to 150°C. This diode is suitable for general purpose applications requiring reliable ESD and surge protection.</p>
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30,000
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Price on request
30,000
|
|
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On Semiconductor
<p>The 1SMA45AT3G is a unidirectional TVS (Transient Voltage Suppression) diode designed by ON Semiconductor for general purpose circuit protection. It provides protection against voltage transients by clamping excessive voltages to a safe level.</p><p> </p><p>This device features a standoff voltage (V_RWM) of 45V and a clamping voltage (V_C) of 72.2V at a peak pulse current (I_PP) of 5.5A. It can handle a peak pulse power (P_PP) of 400W. The diode has a capacitance of 280pF at 1MHz and is not intended for power line protection.</p><p> </p><p>The 1SMA45AT3G is offered in a DO-214AC (SMA) surface-mount package, making it suitable for automated assembly. It operates over a junction temperature range of -65°C to 150°C.</p>
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30,000
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Price on request
30,000
|
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On Semiconductor
<p>The 1SMA6.5AT3G is a unidirectional Zener TVS diode from On Semiconductor designed for general purpose transient voltage suppression. It features a reverse standoff voltage of 6.5V, a clamping voltage of 11.2V, and can handle a peak pulse current of 35.7A with a peak pulse power rating of 400W. The device is based on Zener technology and provides unidirectional protection.</p><p> </p><p>With a capacitance of 1605 pF at 1 MHz, this diode is suitable for applications where high capacitance is acceptable. The operating temperature range spans from -65°C to 150°C, making it suitable for harsh environments. The component is surface mountable, housed in a 6-WDFN exposed pad package (supplier device package 6-TDFN-EP 3x3 mm).</p><p> </p><p>This TVS diode is intended for general purpose circuit protection where power line protection is not required. Its compact package allows for space-efficient designs.</p>
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30,000
|
Price on request
30,000
|
|
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On Semiconductor
<p>The 1SMA8.0AT3G is a Zener-type transient voltage suppression (TVS) diode designed to protect sensitive electronics from voltage transients. It features a reverse standoff voltage of 8 V and a clamping voltage of 13.6 V, ensuring that downstream components are not exposed to damaging overvoltage conditions.</p><p> </p><p>This device can handle a peak pulse current of 29.4 A and a peak pulse power of 400 W, making it suitable for general-purpose circuit protection in a variety of applications. The diode is unidirectional with one channel, and it has a capacitance of 1035 pF at 1 MHz.</p><p> </p><p>The 1SMA8.0AT3G is offered in a surface-mount 6-WDFN exposed pad package (supplier package 6-TDFN-EP 3x3 mm), which facilitates compact PCB layouts and efficient heat dissipation. It operates over a junction temperature range of -65°C to 150°C.</p>
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30,000
|
Price on request
30,000
|
|
On Semiconductor
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30,000
|
Price on request
30,000
|
|
STMicroelectronics
<p>The ESDA14V2-2BF3 is a Zener-type TVS diode from STMicroelectronics designed for general purpose circuit protection. It features a reverse standoff voltage of 12V and a peak pulse power rating of 50W. The device incorporates 2 bidirectional channels for protecting two signal lines.</p><p> </p><p>This TVS diode is surface mountable and packaged in a 4-WFBGA, FCBGA case, specifically a 4-FlipChip (0.77x0.77) supplier package. It operates over a temperature range of -40°C to 125°C. The component is RoHS3 compliant and REACH unaffected.</p><p> </p><p>The diode is suitable for applications requiring low voltage transient suppression. Its compact flip-chip package makes it ideal for space-constrained designs. The 12V standoff voltage allows use in 12V systems for protecting against electrostatic discharge and other voltage transients.</p>
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30,000
|
Price on request
30,000
|
|
Vishay Dale
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30,000
|
Price on request
30,000
|
|
STMicroelectronics
<p>The BZW06-28B is a bidirectional transient voltage suppression (TVS) diode designed for over-voltage and ESD protection in general purpose applications. It features a reverse stand-off voltage of 28.2 V, a maximum clamping voltage of 59 V, and can handle peak pulse currents up to 68 A (8/20 µs waveform). The device is rated for a peak pulse power dissipation of 600 W (10/1000 µs waveform) and a steady state power dissipation of 5 W at 75°C.</p><p> </p><p>This TVS diode offers very fast response time and is suitable for protecting sensitive electronics from voltage spikes. It has a typical capacitance of 500 pF at 1 MHz. The junction temperature range is -50 to +175°C, with an operating temperature up to 150°C. The device is RoHS, REACH, and Conflict Minerals compliant (per datasheet), and the case material meets UL 94V-0 flammability rating.</p><p> </p><p>The BZW06-28B is packaged in a DO-15 (DO-204AC) axial leaded through-hole package, weighing approximately 0.4 g. It is available in bidirectional configuration (indicated by suffix B). The mounting type is through-hole with axial leads, suitable for traditional PCB assembly.</p>
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30,000
|
Price on request
30,000
|
|
Bel Fuse
<p>The Bel Fuse 0ZCG0020FF2C is a polymeric PTC resettable fuse from the 0ZCG series, designed for overcurrent protection in compact electronic circuits. It features a hold current of 200 mA and a trip current of 400 mA, with a maximum voltage rating of 30V DC. The device can handle fault currents up to 40 A and has a typical time to trip of 20 ms at 8 A. Initial resistance is as low as 0.020 Ohms, with a maximum post-trip resistance of 0.800 Ohms. Typical power dissipation is 0.8 W.</p><p> </p><p>The fuse is housed in a standard 1812 (4532 Metric) surface mount package with concave terminals, measuring 4.55mm x 3.24mm x 0.90mm. It operates over a temperature range of -40°C to 85°C and is qualified to AEC-Q200 for automotive applications. The component is RoHS compliant, lead-free, and halogen-free, with MSL Level 1 (unlimited).</p>
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30,000
|
Price on request
30,000
|
|
|
Vishay Dale
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30,000
|
Price on request
30,000
|
|
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Littelfuse Inc.
<p>The 1SMA10AT3G is a unidirectional TVS diode from Littelfuse designed for general-purpose circuit protection. It features a reverse standoff voltage of 10V and a clamping voltage of 17V, providing protection against transient overvoltage events. With a peak pulse power rating of 400W and a peak pulse current of 23.5A, this diode can absorb significant surge energy. The device has a capacitance of 1090pF at 1MHz and operates over a temperature range of -65°C to 150°C. It is packaged in a surface-mount DO-214AC (SMA) case, suitable for automated pick-and-place assembly. This TVS diode is unidirectional and not intended for power line protection. Typical applications include general-purpose circuit protection in consumer and industrial electronics.</p>
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30,000
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Price on request
30,000
|
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Bourns
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30,000
|
Price on request
30,000
|
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Bourns
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30,000
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Price on request
30,000
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|
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On Semiconductor
<p>The 1SMA48AT3G is a unidirectional Zener TVS diode from On Semiconductor, designed for general purpose transient voltage suppression. It offers a reverse standoff voltage of 48V and a clamping voltage of 77.4V, with a peak pulse power rating of 400W. The device is housed in a DO-214AC (SMA) surface mount package, suitable for automated assembly. It operates over a junction temperature range of -65°C to 150°C. The part has a capacitance of 265pF at 1MHz.</p>
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30,000
|
Price on request
30,000
|
|
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Littelfuse Inc.
<p>The 1SMA40AT3G is a unidirectional TVS (transient voltage suppression) diode from Littelfuse Inc., designed to protect sensitive electronic circuits from high voltage transients. It features a working peak reverse voltage of 40V and a clamping voltage of 64.5V, with a peak pulse power dissipation of 400W (1ms pulse). The device can handle a peak pulse current of 6.2A and has a capacitance of 315pF at 1MHz.</p><p> </p><p>This TVS diode is housed in a surface-mount DO-214AC (SMA) package, suitable for automated assembly. It operates over a wide temperature range of -65°C to 150°C. The part is intended for general-purpose applications and does not include power line protection.</p><p> </p><p>Design engineers should note that the datasheet provided for this part number is incorrect (references the 1SMA10CAT3G series). Key electrical parameters such as breakdown voltage, reverse leakage current, and test current are not available from the current data sources. Verification of specifications from the manufacturer is recommended.</p>
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30,000
|
Price on request
30,000
|
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Littelfuse Inc.
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30,000
|
Price on request
30,000
|
|
Bel Fuse
<p>The Bel Fuse 0685P9120-01 is a fast acting surface mount chip fuse from the 0685P series, designed for overcurrent protection in compact electronic assemblies. It is rated for 12A continuous current at 50V DC and features a fast blow response time.</p><p> </p><p>The fuse is housed in a standard 1206 (3216 Metric) package with dimensions of 3.20mm x 1.58mm x 0.63mm, making it suitable for automated SMD assembly processes. It is compatible with lead-free reflow soldering and is supplied on tape and reel for pick-and-place equipment.</p><p> </p><p>The 0685P series is AEC-Q200 qualified and carries cURus and CE safety approvals. The fuse is RoHS compliant, halogen free, and lead free. It has an operating temperature range of -55°C to 125°C and a breaking capacity of 150A at 50V DC.</p>
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30,000
|
Price on request
30,000
|
|
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Vishay Dale
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30,000
|
Price on request
30,000
|
|
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STMicroelectronics
<p>The ESDA37WY is a Zener TVS (transient voltage suppression) diode manufactured by STMicroelectronics, designed to protect sensitive electronics from voltage transients and ESD events. It features a reverse standoff voltage (VRWM) of 36V and a peak pulse power rating of 300W (8/20µs waveform). The device incorporates two unidirectional TVS channels, making it suitable for protecting multiple signal or power lines.</p><p> </p><p>This TVS diode offers a peak pulse current (IPP) of 6.3A under 8/20µs conditions. It operates over a wide temperature range of -55°C to 175°C (junction), enabling reliable performance in harsh environments. The part does not include power line protection, indicating it is intended for signal or low-power line clamping applications.</p><p> </p><p>The ESDA37WY is supplied in a compact SC-70 / SOT-323 surface mount package (supplier package SOT-323-3), which reduces board space requirements. With surface mount technology and an MSL rating of Level 1 (unlimited), it is suitable for automated assembly processes. The device is RoHS3 compliant and REACH unaffected, meeting current environmental standards for electronic components.</p>
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30,000
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Price on request
30,000
|
|
STMicroelectronics
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29,955
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Price on request
29,955
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Vishay Dale
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29,920
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Price on request
29,920
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STMicroelectronics
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29,900
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Price on request
29,900
|
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Littelfuse Inc.
<p>The Littelfuse 0501015.WR is a surface mount fuse from the 501 Series, designed for high-current over-current protection in circuits operating at elevated ambient temperatures up to 150°C. This fast-acting fuse is rated at 15A with a voltage rating of 32VDC and a DC interrupting rating of 150A at 32VDC. It is constructed with ceramic materials, ensuring temperature stability and reliability. The fuse offers a nominal resistance of 0.00250 ohms, a melting I²t of 39.7 A²s at 1 ms opening time, and a voltage drop of 0.04843 V at rated current. It is housed in a compact 1206 (3216 Metric) package measures 3.20mm x 1.63mm x 0.84mm. The 0501015.WR is RoHS compliant, halogen-free, and 100% lead-free, making it suitable for leaded and lead-free reflow or wave soldering processes. It is approved by UL and CSA for reliable use in demanding applications.</p>
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29,859
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Price on request
29,859
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Texas Instruments
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29,850
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Price on request
29,850
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On Semiconductor
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29,800
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Price on request
29,800
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STMicroelectronics
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29,686
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Price on request
29,686
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|
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On Semiconductor
<p>The ESDONCAN1LT1G is a low-capacitance bidirectional ESD protection diode designed by On Semiconductor for protecting CAN transceivers from ESD and transient voltages. It has a reverse working voltage of 24V, a breakdown voltage range of 26.2V to 32V at 1mA, and clamping voltages of 36.6V max at 1A and 50V max at 3A (8/20µs waveform). The device can handle a peak pulse current of 3A and a peak power dissipation of 150W per line. Capacitance is only 10pF at 1MHz, ensuring minimal signal degradation on high-speed data lines.</p><p> </p><p>The device is housed in a surface-mount SOT-23-3 package (also known as SOT-23) and is bidirectional with two protection channels. It is Pb-free, RoHS3 compliant, and meets UL 94 V-0 flammability rating. The ESD rating per IEC 61000-4-2 is 23kV for contact discharge. The S/ESDONCAN1 prefix variant (SESDONCAN1) is AEC-Q101 qualified and PPAP capable for automotive applications.</p><p> </p><p>Typical applications include automotive CAN 2.1 and CAN FD networks, industrial DeviceNet and Smart Distribution Systems, and high-speed FlexRay buses. The low leakage current (100nA max) and matched diode capacitance make it suitable for preserving signal integrity in sensitive transceiver designs.</p>
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29,645
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Price on request
29,645
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STMicroelectronics
<p>The DSILC6-4P6 is a monolithic steering diode array from STMicroelectronics that provides ESD protection for four high-speed data lines. It uses a rail-to-rail topology with a reverse standoff voltage of 5V and a minimum breakdown voltage of 6V at 1mA. The device offers a typical capacitance of only 2pF at 1MHz, minimizing signal degradation on high-speed interfaces such as USB 2.0, Ethernet, and display serial interfaces.</p><p> </p><p>Key electrical characteristics include a peak pulse power rating of 120W, a maximum leakage current of 0.5µA at 5V, and a typical forward voltage of 1V at 10mA. The DSILC6-4P6 meets IEC 61000-4-2 level 4 ESD requirements with 15kV air discharge and 8kV contact discharge capability. It also complies with MIL STD 883E Method 3015-7 class 3 (HBM) with 25kV withstand.</p><p> </p><p>The device is housed in a compact SOT-666 surface-mount package, occupying only 2.9mm² of PCB space. It supports an operating temperature range of -55°C to +150°C and a maximum junction temperature of 125°C. The lead-free package is RoHS compliant. Applications include computers, printers, communication systems, cell phone handsets, video equipment, and any system requiring ESD protection for high-speed interfaces.</p>
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29,621
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Price on request
29,621
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|
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On Semiconductor
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29,483
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Price on request
29,483
|
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Littelfuse Inc.
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29,480
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Price on request
29,480
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|
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Texas Instruments
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29,400
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Price on request
29,400
|
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Littelfuse Inc.
<p>The Littelfuse 30R300UPR is a polymeric PTC resettable fuse from the 30R series, designed for overcurrent protection in low-voltage applications up to 30V. It offers a hold current of 3A at 20°C still air, with a minimum trip current of 6A, ensuring reliable protection against overcurrent conditions.</p><p> </p><p>Key electrical specifications include a maximum voltage of 30V, maximum fault current of 40A, and typical power dissipation of 2W in tripped state. The device trips within 10.8 seconds maximum at 15A. Initial resistance ranges from 20mΩ minimum to 40mΩ typical, with a maximum post-trip resistance of 80mΩ after one hour at 20°C.</p><p> </p><p>The 30R300UPR comes in a radial leaded disc package with through-hole mounting, lead spacing of 5.10mm, and dimensions of 11.4mm x 3.0mm x 19.2mm. It operates over -40°C to 85°C and is RoHS compliant, halogen-free, and meets UL 94V-0 flame retardancy.</p><p> </p><p>Typical applications include USB hubs and ports, computer peripherals, motor protection circuits, and general electronics requiring resettable overcurrent protection.</p>
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29,274
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Price on request
29,274
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|
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Vishay Dale
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29,220
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Price on request
29,220
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|
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On Semiconductor
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29,130
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Price on request
29,130
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Vishay Dale
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29,020
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Price on request
29,020
|
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STMicroelectronics
<p>The BZW50-180B is a bidirectional TVS diode from STMicroelectronics designed for transient voltage suppression in general purpose applications. It features a reverse standoff voltage of 180V and a maximum clamping voltage of 410V at a peak pulse current of 146A (8/20µs waveform). With a peak pulse power rating of 5000W (5kW), this device provides robust protection against voltage transients.</p><p> </p><p>This TVS diode is housed in an R-6 axial package and is through-hole mountable, making it suitable for a variety of circuit protection designs. The device has a nominal capacitance of 750pF at 1MHz, which should be considered for high-frequency signal lines. It is not intended for power line protection.</p><p> </p><p>The BZW50-180B is RoHS3 compliant, REACH unaffected, and has an MSL rating of 1 (unlimited). It is commonly used in applications requiring high surge capability and bidirectional protection.</p>
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28,910
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Price on request
28,910
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STMicroelectronics
<p>The 1.5KE62A is a 1500W unidirectional TVS diode designed to protect sensitive electronic equipment from voltage transients induced by lightning and other transient voltage events. It features a reverse standoff voltage of 53V, a minimum breakdown voltage of 58.9V, and a maximum clamping voltage of 111V at peak pulse current.</p><p> </p><p>This device offers a peak pulse power dissipation of 1500W for a 10/1000µs waveform and a fast response time of typically less than 1.0ps from 0V to breakdown voltage. It is housed in a DO-201 (DO-201AA, DO-27, Axial) through-hole package with matte tin lead finish and is rated for operation from -55°C to 175°C.</p><p> </p><p>The 1.5KE62A is suitable for general purpose applications including I/O interface protection, VCC bus protection, and other vulnerable circuits in telecom, computer, industrial, and consumer electronics. It is halogen free and Pb-free (E3) compliant.</p>
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28,813
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Price on request
28,813
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STMicroelectronics
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28,793
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Price on request
28,793
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Texas Instruments
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28,655
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Price on request
28,655
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Diodes Incorporated
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28,535
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Price on request
28,535
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