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 | |
|---|---|---|---|
Littelfuse Inc.
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53,335
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Price on request
53,335
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On Semiconductor
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53,303
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Price on request
53,303
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On Semiconductor
<p>The ESDU3121MXT5G is a 12V unidirectional TVS diode designed for ESD and surge protection. It protects voltage-sensitive components from electrostatic discharge and electrical fast transients, meeting IEC 61000-4-2 Level 4 and IEC 61000-4-5 standards.</p><p> </p><p>Key electrical characteristics include a reverse working voltage of 12V, a breakdown voltage range of 14.1V to 15.8V at 1mA, and a clamping voltage of 20.3V typical and 22V maximum at 8.5A peak pulse current (8/20µs waveform). It features low leakage current of 0.1µA maximum and junction capacitance of 55pF at 1MHz.</p><p> </p><p>The device is housed in a small 2-XDFN package (X2DFN2, 1.0mm x 0.6mm) suitable for space-constrained applications. It is surface mountable and supplied in tape and reel packaging with 8000 units per reel.</p><p> </p><p>Typical applications include power line protection, GPIO protection, and port protection in portable electronics such as cellular phones, tablets, MP3 players, and digital cameras. The device is RoHS compliant, lead-free, and halogen-free.</p>
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53,255
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Price on request
53,255
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Semtech
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53,175
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Price on request
53,175
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Semtech
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53,151
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Price on request
53,151
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Texas Instruments
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52,867
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Price on request
52,867
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Littelfuse Inc.
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52,628
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Price on request
52,628
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STMicroelectronics
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52,500
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Price on request
52,500
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STMicroelectronics
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52,500
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Price on request
52,500
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Littelfuse Inc.
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52,360
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Price on request
52,360
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Texas Instruments
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52,237
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Price on request
52,237
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Nexperia USA Inc.
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52,020
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Price on request
52,020
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Bel Fuse
<p>The C1Q 4 is a surface mount fast-acting chip fuse from Bel Fuse's C1Q series. Rated for 4A continuous current with voltage ratings of 125VAC and 63VDC, it features a fast blow response time suitable for protecting sensitive circuits. With an interrupting rating of 100A AC and 50A DC, it can safely clear fault currents. The fuse has a nominal cold resistance of 0.028Ω and a melting I²t of 0.038 A²s. It is housed in a 1206 (3216 metric) package, measuring 3.20mm x 1.58mm x 0.58mm, making it ideal for compact SMD designs. Operating temperature range is -55°C to 125°C. The C1Q 4 is RoHS, REACH, and halogen-free compliant, and approved by CE, CSA, and cULus. Typical applications include notebook computers, LCD monitors, power supplies, and DC-DC converters.</p>
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52,004
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Price on request
52,004
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Littelfuse Inc.
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52,000
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Price on request
52,000
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Bourns
<p>The Bourns 2036-09-SM-RPLF is a 3-electrode gas discharge tube (GDT) from the TRIGARD series, designed for board-level surge protection in high-bandwidth applications. It features a DC sparkover voltage of 90 V with ±20% tolerance and an impulse discharge current rating of 10 kA (8/20 µs waveform).</p><p> </p><p>The device offers low capacitance of less than 2 pF, ensuring minimal signal degradation in broadband circuits such as xDSL, cable broadband, and high-speed Ethernet. It is housed in a leadless 3-SMD cylinder square end package suitable for surface mount assembly and pick-and-place manufacturing.</p><p> </p><p>The GDT operates by ionizing and creating a short-to-ground path during transient overvoltage events, then returning to a high-impedance state after the surge passes. It does not fail short and is recognized per UL 497B.</p>
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51,909
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Price on request
51,909
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STMicroelectronics
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51,894
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Price on request
51,894
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On Semiconductor
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51,870
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Price on request
51,870
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Littelfuse Inc.
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51,670
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Price on request
51,670
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Littelfuse Inc.
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51,638
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Price on request
51,638
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ROHM Semiconductor
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51,518
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Price on request
51,518
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Semtech
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51,403
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Price on request
51,403
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Diodes Incorporated
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51,210
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Price on request
51,210
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Littelfuse Inc.
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51,114
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Price on request
51,114
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Texas Instruments
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51,042
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Price on request
51,042
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Vishay Dale
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51,030
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Price on request
51,030
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Diodes Incorporated
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51,020
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Price on request
51,020
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Diodes Incorporated
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51,020
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Price on request
51,020
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Nexperia USA Inc.
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51,020
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Price on request
51,020
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Littelfuse Inc.
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50,921
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Price on request
50,921
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Vishay Dale
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50,841
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Price on request
50,841
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Bel Fuse
<p>The 0ZCH0075AF2E is a polymeric PTC resettable fuse from Bel Fuse's 0ZCH series. It offers a hold current of 750 mA and a trip current of 1.5 A, with a maximum voltage rating of 24V. The device can withstand fault currents up to 100A and has a typical power dissipation of 0.6W.</p><p> </p><p>This fuse is designed for surface mount assembly in a 1210 (3225 metric) concave package, measuring 3.22mm x 2.58mm x 0.70mm. It features a fast trip time of 100 ms at 8A, with low resistance (Rmin 130 mOhm, R1max 400 mOhm). Operating temperature range is -40°C to 85°C.</p><p> </p><p>The 0ZCH0075AF2E is RoHS3 compliant, lead-free, halogen-free, and AEC-Q qualified for automotive applications. It is suitable for overcurrent protection in various circuits where resettable protection is required.</p>
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50,700
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Price on request
50,700
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Littelfuse Inc.
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50,396
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Price on request
50,396
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Littelfuse Inc.
<p>The Littelfuse 0461.500ER is a 500mA board-mount slow-blow (Slo-Blo) fuse from the 461 TeleLink series. It is rated for 600VAC and 80VDC with a breaking capacity of 60A AC and 100A DC.</p><p> </p><p>This surface-mount fuse is housed in a 2-SMD square end block package measuring 10.10mm x 3.12mm x 3.12mm. It operates over a -55°C to 125°C temperature range and is designed for telecom applications. The fuse carries CSA and UR agency approvals and is RoHS compliant and halogen free.</p><p> </p><p>Designed for surge resistance, the 461 series meets Telcordia GR-1089-CORE and TIA-968-A requirements when used with appropriate overvoltage protection devices. The slow-blow characteristic ensures the fuse tolerates brief inrush currents without nuisance opening, while providing overcurrent protection for telecom line cards and networking equipment.</p><p> </p><p>The part is available in tape-and-reel (F1449TR-ND), cut tape (F1449CT-ND), and Digi-Reel (F1449DKR-ND) packaging options for automated assembly.</p>
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50,316
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Price on request
50,316
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Texas Instruments
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50,269
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Price on request
50,269
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Littelfuse Inc.
<p>The 1206L012WR is a polymeric PTC resettable fuse from Littelfuse, part of the 1206L series. It provides overcurrent protection with a hold current of 125 mA and a trip current of 0.29 A. The device is rated for a maximum voltage of 30 V and can withstand fault currents up to 100 A. Typical power dissipation is 0.6 W.</p><p> </p><p>Initial resistance is 1.5 Ω minimum, increasing to 6 Ω maximum after tripping. The trip time is 200 ms at 1 A. The fuse is surface mounted in a 1206 (3216 metric) package with concave terminals, making it suitable for space-constrained applications.</p><p> </p><p>Operating temperature range is -40°C to 85°C. The component is RoHS and halogen-free compliant.</p>
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50,222
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Price on request
50,222
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Littelfuse Inc.
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50,148
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Price on request
50,148
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Vishay Dale
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50,020
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Price on request
50,020
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STMicroelectronics
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50,000
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Price on request
50,000
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Littelfuse Inc.
<p>The Littelfuse 0312007.HXP is a 7A, 250VAC fast-acting (fast-blow) 3AG cartridge fuse from the 312 series. It is designed for overcurrent protection in a wide range of electronic applications. The fuse features a glass tube construction with nickel-plated brass end caps, fitting standard 3AB/3AG fuse holders.</p><p> </p><p>Key electrical specifications include a current rating of 7A, a voltage rating of 250VAC, and a breaking capacity of 200A at 250VAC. The fast-acting response time ensures rapid disconnection under overcurrent conditions, protecting sensitive components. The operating temperature range spans -55°C to 125°C, suitable for demanding environments.</p><p> </p><p>The fuse is approved by CE, CSA, KC, PSE, and UL agencies, confirming its compliance with international safety standards. It is RoHS compliant and lead-free. The cartridge package requires a separate fuse holder for installation, making it suitable for panel-mount or in-line applications.</p>
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50,000
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Price on request
50,000
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Bel Fuse
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50,000
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Price on request
50,000
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STMicroelectronics
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50,000
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Price on request
50,000
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Microchip Technology
<p>The 1N5647A is a unidirectional transient voltage suppressor (TVS) diode from Microchip Technology, designed to protect sensitive electronics from voltage transients. It features a reverse standoff voltage of 33.3V and a clamping voltage of 53.9V, with a peak pulse current rating of 28A. The device delivers 1500W of peak pulse power at 10/1000µs waveform, ensuring robust protection against inductive switching transients, ESD, and EFT events.</p><p> </p><p>This TVS diode is housed in a hermetic DO-13 (DO-202AA) metal package, suitable for through-hole mounting. It operates over a wide temperature range from -65°C to 175°C, making it ideal for harsh environments. The Zener clamping technology provides virtually instantaneous response times, typically less than 100 picoseconds.</p><p> </p><p>Typical applications include transient protection in avionics, industrial electronics, and communication systems. The 1N5647A is part of the 1N5629 through 1N5665A series, which offers JEDEC-registered unidirectional TVS devices with consistent 1500W power handling.</p>
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50,000
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Price on request
50,000
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STMicroelectronics
<p>The ESDLIN1524BJ-HQ is a bidirectional TVS diode from STMicroelectronics designed for ESD protection in automotive applications. It features a Zener clamping technology with a clamping voltage of 40V and can handle peak pulse currents up to 50A, with a peak pulse power rating of 160W.</p><p> </p><p>The device has a low capacitance of 16pF at 1MHz, making it suitable for high-speed data lines. It operates over a wide temperature range of -40°C to 150°C and is housed in a compact SOD-323 (SC-76) surface mount package. The ESDLIN1524BJ-HQ is RoHS3 compliant and REACH unaffected.</p>
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50,000
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Price on request
50,000
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Bourns
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50,000
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Price on request
50,000
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STMicroelectronics
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50,000
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Price on request
50,000
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Littelfuse Inc.
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50,000
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Price on request
50,000
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Littelfuse Inc.
<p>The Littelfuse 0312001.MXP is a 1A, 250VAC fast-acting glass cartridge fuse from the 312 series. It features a breaking capacity of 35A at 250VAC and a nominal melting I²t of 0.76 A²s. The fuse operates over a temperature range of -55°C to 125°C. It is designed for use as supplementary protection in appliances and electronic equipment. The fuse comes in a standard 3AB/3AG package (1/4" x 1-1/4") and requires a holder for mounting. It is RoHS compliant and lead-free as per manufacturer datasheet, with approvals from CE, CSA, KC, PSE, and UL.</p>
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50,000
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Price on request
50,000
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Diodes Incorporated
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49,930
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Price on request
49,930
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Littelfuse Inc.
<p>The Littelfuse 0451.500MRL is a 500mA, 125V very fast-acting fuse in a surface mount package (2-SMD, square end block). It is part of the 451 series of Nano2 SMF fuses designed for overcurrent protection in secondary side circuits. Key specifications include a breaking capacity of 50A at rated voltage, melting I²t of 0.0795 A²s, and an operating temperature range of -55°C to 125°C. This fuse is RoHS compliant and halogen free, with approvals from CSA and UL. It is suitable for use in notebook PCs, LCD displays, power supplies, networking equipment, and other electronic devices requiring reliable overcurrent protection.</p>
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49,916
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Price on request
49,916
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Diodes Incorporated
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49,883
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Price on request
49,883
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