Bourns, Inc. has launched a new series of air coil inductors that features high Q, high self-resonant frequency and tight inductance tolerance. The high-frequency and low-loss Model AC4842R air coil inductor series gives RF application designers a wider range of high Q solution options, said the company.

Air coil inductors use air as their core material, compared to other types such as ferrite core inductors, offering advantages in low core losses and minimal saturation, according to Bourns. This makes them suitable for a range of applications, including signal filtering, impedance matching and frequency tuning in a variety of electronic circuits.

The AC4842R series delivers a high Q value of at least 100 with inductance from 22 to 150 nanohenry (nH). They are suited for high-frequency TV and radio receivers, radio transmitters and RF amplifier and tuning applications.

Thanks to a wire coil design without a magnetic core, the AC4842R series provides significantly lower inductance values and higher functionality at high frequencies. It is also manufactured with an epoxy cover for added mechanical stability.

Designed with tight inductance tolerance, the air coil inductors feature a DC resistance from 4 to 33 milliohms and a 1.2 A to 3.5 A maximum rated current. The operating temperature range is –25°C to 125°C. The devices are RoHS compliant.

The air coil inductors measure 4.83 × 3.81 × 4.2 mm, and their surface-mount design makes them suited for pick and place processes. The Model AC4842R Series is available now.

Bourns, Inc. has released a new series of four high power, ultra-low ohmic current sense resistors. These current measurement devices are designed to help save energy and maximize sensing performance in power electronics designs.

“Current sense resistors are increasingly being used in higher power applications due to their precise measurement accuracy and relatively low cost compared to other technologies,” Bourns said.

The four CSI Model Series feature low temperature coefficient of resistance (TCR) for operating accuracy over a wide temperature range and long-term stability. Together, the very low resistance levels, low thermal electromagnetic force (EMF) and high-power handling capabilities make them suitable for a variety of industrial and consumer applications and power electronics including battery management systems (BMS), switched-mode power supplies (SMPS) and motor drives.

The Model CSI Series is constructed with electron beam welded (EBW) resistive and copper alloy terminals. Bourns said the metal alloy current sensing element supports low thermal EMF and low TCRs of ±50 PPM/°C in the 20°C to 60 °C temperature range.

The series is available in two- and four-terminal options. The two-terminal models are offered in three footprint sizes: 5930, 3920 and 2512. The four-terminal devices, in a 4026 size, allow for very precise four-wire Kelvin (K) resistance measurement, Bourns said.

All four models provide resistance values as low as 0.2 milliohms, power ratings of up to 15 W and a range of low resistance options. Available now, the devices are RoHS compliant and halogen-free.

Kyocera AVX has announced that several of its VCAS Series multilayer varistors (MLVs) are  now qualified to both the VW80808 and AEC-Q200 standards. The VCAS Series MLVs, introduced in October of 2022, were the industry’s first MLVs with automotive-grade flexible terminations, and are now the first flexible-termination varistors to be qualified to both AEC-Q200 and VW80808 standards.

The VW80808 standard targets the protection of automotive electrical systems from shorts involving the battery. The qualification is based on 5-mm board bend testing, power line testing (60,000 pulses at -55°C, 25°C and 125°C) and temperature cycling testing.

The VCAS Series MLVs with FLEXITERM terminations can withstand severe flection, vibration and temperature cycling, said the company. They can tolerate up to 5 mm of mechanical board flexure and up to 3,000 temperature cycles up to 150°C, which exceeds the AEC-Q200 testing requirement of 1,000 cycles at up to 125°.

Test results showed that the VCAS Series MLVs exhibited zero board flex failures, including internal cracks and depanelization, and no significant changes to their electrical characteristics, even when subjected to 200% more temperature cycles at 20% higher temperatures than those mandated for AEC-Q200 qualification, Kyocera AVX said.

The VW80808 qualification ensures that these devices can operate in an extended range of demanding high-reliability applications in the automotive industry. They can also be used in industrial, aerospace, downhole drilling, IoT and consumer electronics applications.

Key specs include clamping voltages from 14–165 V, transient energies from 0.1 up to 4.5 J and working voltages ranging from 3.3–85 V. The operating temperature range is -55°C to 150°C.

The RoHS-compliant devices are available in four surface-mount case sizes: 0603, 0805, 1206 and 1210. Lead time is currently 10 weeks. They can be ordered at Digi-Key Electronics and Mouser Electronics websites.

Q-Tech Corp. has introduced its New Space Series of temperature compensated crystal oscillators (TCXOs). The new TCXOs, designed by the company’s German affiliate, AXTAL, offer low phase noise and high-frequency stability and are fully TID and SEE radiation tested.

The TCXOs are optimized for low-earth orbit (LEO) satellite timing and frequency generation applications. Key features include radiation tolerance to 50 kRad (Si) TID, single event latch-up (SEL) immunity (tested up to 120 MeV-cm2/mg), selectable frequency stability (±1 to ±3 ppm) and phase noise floor of -160 dBc/Hz (at ≥100 kHz offset).

The New Space devices are offered in two small packages: the AXLE5032S in a 5 × 3.2-mm footprint and the AXLE7050S in a 7 × 5 mm package. Testing and screening are available for specific customer requirements and swept crystal versions are available.

“Today’s low-earth orbit applications require lower-cost New Space products that offer proven state-of-the-art performance and known radiation hardness,” said Henry Halang, AXTAL’s managing director, in a statement. “The AXTAL New Space Series TCXO’s noise and stability features are optimized to meet all mission-critical specifications. Plus, they offer a unique benefit–their industry-leading small package sizes.”

The TCXOs are packaged in hermetically sealed surface-mount ceramic enclosures. They are available now.

Bourns, Inc. has announced an advanced, space-saving EdgMOV varistor series with high surge protection performance in a space-saving design. The new family with high surge capabilities are available in a range of model options that allow designers to select the size and level of surge protection for their applications.

The range of options, for example, enable designers to specify a higher surge rating with a lower clamping voltage or the same surge rating with a smaller diameter protection device, according to Bourns. It also allows designers to select a higher MOV voltage, while maintaining the same clamping voltage, which helps reduce the potential of MOV leakage current, which can cause failures.

The EdgMOV disc varistors are designed to match common MOV footprints, allowing for drop-in replacement without any PCB redesign. They are available in four model family sizes of 7 mm, 10 mm, 14 mm and 20 mm with nominal current ratings of 1.5 kA, 3 kA, 5 kA and 8 kA, respectively.

The EdgMOV varistors offer comparable surge ratings of the next larger size of conventional MOV components, Bourns said. For example, a 10-mm EdgMOV surge protector is rated for 3-kA nominal current (15 operations), which is comparable to a current typical 14-mm standard MOV (typically also rated at 3-kA nominal current).

If a designer wants to increase the primary protector performance without increasing its size, a similarly sized EdgMOV protector can be selected to replace the existing MOV, with enhanced performance in the same package size, the company added.

In addition, the coating material used in the EdgMOV devices is rated for use up to 105°C, which is higher than the standard 85°C. “UL requires components that are rated higher than 85 °C to undergo 1000 hours of an aging test, helping to increase maximum equipment lifespan for end users,” Bourns said.

Available now, the EdgMOV disc varistor series is RoHS compliant and halogen free. For more information, visit the varistor product page (EV series).

Q-Tech Corp. has announced the availability of the AXIOM line of ultra-low noise (ULN) OCXOs from its German affiliate, Axtal.  The new line is available in custom versions, offering designers specific frequencies and modules with multiple outputs.

The new AXIOM OCXOs with ultra-low close-in phase noise and noise floor enable higher resolution for radar systems, higher quality and more transmissible information in communications systems and higher accuracy and lower measurement limits in RF measurement systems, said the company.

The new devices include the AXIOM145ULN for communications systems and RF measurement systems that typically require 10-MHz OCXOs. It features frequency over temperature stability of 5 to 20 ppb; close-in phase noise of <-115 dBc/Hz @ 1 Hz offset and a noise floor of <-170 dBc/Hz @ ≥100kHz. Radar and other similar applications require frequency generation from MHz to GHz, Q-Tech said.

Also available are the AXIOM75ULN and AXIOM5050ULN (80 to 160 MHz) and multiple-output AXIOM2700 (50 MHz to 7.0 GHz) that are well suited for these applications. They offer close-in phase noise of <-140 dBc/Hz @ 100 Hz offset, and noise floors down to -185 dBc/Hz, respectively (at 100 MHz carrier frequency).

“AXTAL not only offers ULN OCXOs operating over broad frequency ranges, but entire custom modules, which generate GHz signals using frequency multiplication and/or phase-locked loop (PLL) techniques,” said Henry Halang, AXTAL’s managing director, in a statement. “These modules are fully customizable providing customers with maximum design flexibility.”

The AXIOM OCXOs are available now. Visit the OCXO product page for more information.

TDK Corp. has added a series of high-performance EPCOS ERUC23 coupled inductors (B82559S*) to its family of flat wire inductors. Coupled inductors have two windings that share a single magnetic core, offering higher flexibility in applications.

“Since the two windings are coupled, the ripple current is reduced, which improves efficiency,” TDK said. In addition, by using coupled inductors instead of two chokes, it saves significant space on the circuit board, the company added.

These EPCOS ERU23 inductors are suited for dual-phase buck converters, boost converters, buck/boost converters as well as hybrid voltage converters (flying capacitor converters) that convert 48 V to 12 V. They target the server, 48-V automotive and general power applications.

The coupled inductors offer high saturation currents and low DC resistance. The series is comprised of six types with a coupled inductance range from 1.4 µH to 4.1 µH and saturation currents from 50 A to 97 A. Depending on the type, the DC resistance of a single winding is 0.82 mΩ to 1.85 mΩ. The operating temperature range is -40°C to 150°C.

The AEC-Q200-qualified and RoHS-compliant components measure 26.8 × 13.8 mm2. Heights vary between 13.7 mm and 14.0 mm, depending on the type. The devices can be picked and placed automatically.

Murata Manufacturing Co., Ltd. is claiming the smallest and thinnest 1-µF LW reversed multi-layer ceramic capacitor (MLCC) for automotive applications with the introduction of its LLC series. Featuring a reversed termination for low equivalent series inductance (ESL), the automotive-grade MLCCs tout the industry’s first 0.18-mm profile package.

In addition, the 1-µF capacitance in a 0.5 × 1.0 mm footprint makes the parts the smallest in the market, Murata said.

The small size is achieved using Murata’s proprietary thin-layer forming and high-precision lamination technology, in combination with advanced material atomization and homogenization techniques. The result is about a 20% reduction in component height compared with existing parts, according to the company.

Murata said the smaller size allows the capacitors to fit more easily on the backside of circuit boards. It also allows the parts to be placed in optimum positions for decoupling of processor power rails, close to the die. This reduces the number of capacitors required, thus saving cost and increasing system reliability, the company said.

The MLCC series features low equivalent series resistance (ESR) and a reduction in ESL, which is reported to reduce the high-frequency impedance of the capacitors. “This improves circuit performance to meet the requirements of modern, low-voltage, compute-intensive applications such as automotive advanced driver-assistance systems (ADAS),” Murata said.

The LLC series complies with AEC-Q200 requirements, passing the 1,000 temperature cycle test and temperature/humidity endurance test of 85°C at 80-85% humidity for 1,000 hours. The operating temperature range is -55℃ to 125℃. Click here for additional product information.

Kyocera AVX is offering three new multilayer organic (MLO) filter series, claiming best-in-class performance for a variety of RF applications. Designed using company’s MLO high-density interconnect technology, the LP Series MLO low-pass filters, HF Series MLO high-pass filters and BP Series MLO band-pass filters exhibit a high dielectric constant and high lot-to-lot repeatability. Low material losses enable high-Q passive printed elements, such as inductors and capacitors, in a multilayer stack.

The filters are not subject to performance variations caused by temperature changes and expansion of organic PCBs, resulting in greater reliability than standard silicon and ceramic filter solutions, according to the company. Typical applications for the three series include mobile communications, 5G, radar, signal processing, instrumentation and test equipment.

Key features of all three series include low parasitic and insertion loss, effective heat dissipation, very high rejection and improved solderability. The filters are rated for 50-Ω impedance up to 12 GHz (and soon up to 20 GHz), and provide an extended operating temperature range from -55°C to 85°C. The MLO filters are 100% electrically tested.

Thanks to the material technology, the filters integrate inductors and capacitors into small, low-profile land grid array surface-mount packages for a reduction in circuit complexity and board space as well as improved performance and reliability compared to discrete inductors and capacitors, according to the company.

The LP Series filters are rated for 4-W continuous power handling, frequencies from 71 MHz to 7.09 GHz and less than 1.2-dB insertion loss for passband frequencies extending from DC-f0. The filters support a variety of frequency bands and multiple wireless standards.

The HF Series MLO filters are rated for 2-W continuous power handling. They feature passband frequencies from 740 MHz to 8 GHz and a maximum of 1.20-dB insertion loss.

The BP Series MLO filters feature steep roll-off and high rejection of out-of-band frequencies and are rated for 1-W or 2-W continuous power handling, frequencies from 770 MHz to 4.68 GHz and less than 5-dB insertion loss. They are currently available in six case sizes (2616, 3116, 3416, 4016, 4617 and 5021) and are suitable for use in military and EMS radios, UAVs, base stations and wireless access points and terminals.

All of the new filters are available in RoHS compliant and lead-free compatible variants in a variety of case sizes from 2616 to 5021 with maximum height profiles of 1.02 mm and gold terminations. They do not contain substances of very high concern (SVHCs).

The MLO filters are currently available in waffle packs or tape and reel in quantities of 250 or 1,000. Custom MLO filters are available.

To address the growing need for fast transmission of signals, while keeping noise from interfering with devices and affecting communication, TDK Corp. has introduced the TCM0403T series of noise reduction common-mode filters. Designed for high-speed interface differential transmission, the thin-film common-mode filters are available in the industry’s smallest package size, measuring 0.45 × 0.3 × 0.2 mm.

Target applications include high-speed differential interfaces, including USB3.0/3.1/3.2, HDMI2.0/2.1, Display port/eDP and MIPI D-PHY, for smartphones, tablets and wearable devices.

The TCM0403T-200-2P-T210 and TCM0403T-080-2P-T210 feature a differential insertion loss cutoff frequency of 8 GHz or higher and support transfer speeds up to 12 Gbits/s. The TCM0403T-200-2P-T210 offers a high common mode attenuation of 42 dB at 2.4 GHz, and the TCM0403T-080-2P-T210 features a high common mode attenuation of 34 dB at 5.0 GHz. The operating temperature range is –25 to 85°C.

TDK said common mode attenuation, an important index for noise countermeasures, has improved in the TCM0403T series compared to conventional products.

The devices feature a proprietary coil conductor pattern that uses a thin-film production method and leverages material technology developed via TDK’s magnetic heads. The common-mode filters support miniaturization and weight reduction of electronic devices and offer noise control in high-speed differential transmission and high common mode attenuation.