Circuit Protection
Multilayer Varistors from AVX
AVX Corporation has expanded its AntennaGuard Series of low capacitance multilayer varistors (MLVs) to include a sub 1pf version. Designed to provide a one chip solution for protecting high speed digital interfaces, RF antenna and RF amplifier circuits against ESD events, the application specific, bi-directional transient voltage suppressor provides minimal signal distortion and low insertion loss. The low profile 0402 MLV features a fast response time to ESD and can withstand successive 1k strikes at 8kV (IEC 61000–4-2).
Double-Diode Bus Port-Protection Array from Vishay
Vishay Intertechnology has released a compact new double-diode ESD-protection array designed to protect dual high-speed USB ports or up to two other high-frequency signal lines against transient voltage signals.
New Chip Varistor Series for automotive Applications
The requirements on product reliability in the automotive sector are among the toughest in industry. Targeting these demands KOA introduced the chip Varistor series NV73DL for automotive applications. The complete AEC-Q200 test data is available now for the new Varistor series.
Murata's PRF thermistor series protects power FETs in multiple locations in POL converter applications
The latest addition to Murata's PRF family of chip ceramic thermistors (POSISTORs) is the PRF18xx5RB series, designed for overheat detection of power FETs in point of load (POL) DC-DC converters and other power supply applications. Each part has two temperature sensing points and features characteristic curves that rise very sharply. The series has a resistance of 470 at 25C, rising to 4.7K between 65 and 145C, rising further to 47k between 80 and 150C, depending on the part number. The PRF series is available in tiny 0603 packaging, and is also suitable for detecting overheat conditions in battery packs, motors, power devices and other systems.
Four-Channel, Single-Package Solution For Data And Power Isolation from Analog Devices
Analog Devices is expanding its family of digital isolation products with a series of four-channel devices that isolate both data and power. Each device integrates ADI's iCoupler digital isolation technology and ADI's proprietary isoPower dc-to-dc converter, providing both isolated power and isolated signal channels within a single package.
Digital Isolators Qualified For Automotive Systems are a first says Analog Devices
Tuning its proprietary iCoupler digital isolation technology to meet the reliability and quality needs of emerging electric-hybrid vehicles, Analog Devices, Inc. (ADI) is introducing a family of digital isolators designed to operate in today's electrically challenging automotive environment. Unlike the relatively low-voltage signals powering most in-car entertainment, safety, and power train systems, hybrid-vehicle batteries can operate at voltages in excess of 600 V, which creates a need to galvanically isolate system-critical electronics. Analog Devices' new ADuM120xW, ADuM130xW and ADuM140xW digital isolators were developed for electric-hybrid vehicle systems, such as motor drives and battery management systems. These new iCoupler products are the first digital isolators to carry an AEC-Q100 qualified –40°C to +125°C automotive temperature rating.
Lightning Protection for Load Cell Installations
Celsum Technologies Ltd have recently added to their range of strain gauge based sensors and instrumentation the IPU40 Lightning Protection System. The IPU40 is especially useful for applications with external load cells, such as vehicle weighing, web tensioning, crane loading, canitlever overload protection, lift assemblies, generic load movers, and many others.
Medium Power multilayer chip varistors
AVX Corporation has made available medium power multilayer chip varistors for transient voltage suppression and ESD protection in automotive electronics, designated the Automotive Series – VC13, 14, 15 and 20. The devices operate over -55 to 125 degrees Celsius, feature high energy ratings of up to 25 Joules in a 2220 case size, and are specified with 'Load Dump' and 'Jump Start' test requirements.
Precision Zener Diodes protect Automotive Infotainment Peripherals
Tyco Electronics has announced the addition of two new devices to its line of PolyZen polymer enhanced, precision Zener diode micro-assemblies. The new devices feature a higher hold current (2.3A) and are designed to help protect circuits in global positioning systems (GPS), smart phones, game consoles, portable media players (PMPs) and other video-based peripherals that can be charged in the car.
Medium power multilayer chip varistors
Medium power multilayer chip varistors from AVX Corporation are available for transient voltage suppression and ESD protection in telecommunications, designated the Telecom Series – VC14. The devices operate over -55 to 125 degrees Celsius, and meet interference requirements of telecoms equipment with a 2000 V rated test pulse of 10 x 700 µs duration as specified by CCITT or IEC 61000-4-5. For example a 60 Vrms varistor can reduce the interference voltage at the equipment connected from 2 kV to less than 200 V.
Low leakage transient voltage suppressors from AVX
UltraGuard Series ZnO based varistors from AVX Corporation, a leading manufacturer of advanced passive components, exhibit very low leakage current of2 µA maximum making them ideal transient protection applications where power consumption is a primary concern.
Multilayer ceramic transient voltage suppressors target ESD protection for CMOS, Bipolar and SiGe devices
StaticGuard multilayer ceramic transient voltage suppressors from AVX Corporation, a leading manufacturer of advanced passive components, are designed to address ESD protection for CMOS, Bi-polar and SiGe based devices. The voltage suppressors meet 15 kV ESD pulse (air discharge) per IEC 1000-4-2, Level 4, generating less than 20 millijoules of energy. It is particularly important to protect ICs against ESD as the typical failure voltage for CMOS and Bi-polar is under 200 V.
STMicroelectronics Combines ESD Protection and EMI Filtering in Small Packages
STMicroelectronics has announced new devices that combine EMI filtering and ESD protection in a single ultra-compact package, enabling system designers to implement both functions within a footprint of 0.6mm2. Until now, the smallest available components have required this much board space for ESD protection alone.
Device Helps Provide Resettable Circuit Protection For Automotive Wire Harnesses
Tyco Electronics has announced the introduction of a new line of Raychem Circuit Protection PolySwitch devices for the automotive market. Useful in helping to provide resettable overcurrent protection for passenger vehicle and heavy truck wire harnesses, the PolySwitch bladed contact device features a 2.8 mm form factor to facilitate easy, one-to-one replacement of mini-sized fuses and Type II bimetal circuit protection devices in 12V vehicle systems.
Varistors from AVX reduce component count for ESD protection in CAN applications
CAN Series varistors from AVX Corporation are specifically designed to provide ESD protection in controlled-area-network (CAN) applications, predominantly in automotive electronics. The zinc-oxide (ZnO) based, multilayer ceramic varistors feature non-linear, bi-directional voltage-current characteristics similar to back-to-back Zener diodes and an EMC (electromagnetic compatibility) capacitor in parallel. This "equivalent" capacitor ensures inherent EMI/RFI attenuation.
Multilayer varistors from AVX protect antennas and RF amplifiers from transients and ESD
AntennaGuard multilayer ceramic transient voltage suppressors from AVX Corporation, a leading manufacturer of advanced passive components, target RF-antenna and RF-amplifier protection. These devices are zinc-oxide (ZnO) based, multilayer ceramic chips in 0402 and 0603 sizes and feature non-linear, bi-directional voltage-current characteristics similar to back-to-back Zener diodes and an EMC (electromagnetic compatibility) capacitor in parallel.
Circuit breakers take flight with Aerco
Aerco holds stock of a wide range of E-T-A circuit breakers designed specifically to provide electrical safety on all types of military and civil aircraft and meet the demands of the aerospace industry. E-T-A has long experience of supplying breakers that have high interrupt capacity and tolerance to adverse conditions combined with the small physical size and low weight essential for use in the confines of aircraft and aerospace vehicles.
On-Load Isolators from Rittal
Rittal RiLine NH on-load isolators provide safe, reliable isolation protection from down-stream electrical equipment. Available either with or without fuse monitoring, the isolators range from 100 to 630A (60mm), sizes 000 to 3 and can be easily mounted directly onto Rittal's range of busbar systems.
Surge Suppression Devices Help Protect High Data Rate Telecom and Datacom Equipment
Tyco Electronics has announced the addition of new devices to its Raychem brand SiBar thyristor series. These new bi-directional transient voltage surge suppressors include an expanded range of available voltages, and lower capacitance to help protect high-speed ADSL/VDSL modems, Ethernet and Power-over-Ethernet and other high data rate communications equipment from damage from overvoltage events.
Current monitor simplifies high voltage circuit protection
With its extended common-mode sensing voltage range of 3V to 60V, the ZXCT1080 current monitor from Zetex Semiconductors provides a simple solution for high side current sensing in a wide range of high voltage circuit protection duties in automotive, industrial motor control and power supply applications.
ESD and Overcurrent Reference Layout for HDMI 1.3 Interfaces Based on Passive Protection Devices
Tyco Electronics announced today the introduction of a reference layout for ESD and overcurrent protection for HDMI 1.3 interfaces. The reference layout utilizes Tyco Electronics' low-capacitance (0.25pF signal to ground) PESD protection devices, and space-effective component placement and routing to help protect against ESD events and optimize board space. The reference layout also includes optional overcurrent protection on the +5V rail, using the PolySwitch nanoSMD device.
Inductor/Transformer Features a Low Profile Surface Mount Design
The DR359 Series Surface Mount Inductor/Transformer from Datatronics features a unique dual coil design in a compact, low-profile package that makes it ideal for a wide range of applications in mini and hand-held electronic devices designed for the consumer, industrial, instrumentation, telecom and other industries.
Low-Profile Surface Mount Inductors Save Space
Designers of small, compact or portable electronic equipment will find the new low-profile DR331-5 Surface Mount Inductor from Datatronic Distribution offers excellent EMI protection performance and reliability in a miniature package.
Chip Inductor Supports High Frequency Electronic Circuitry
With a sub-1mm square surface mount chip footprint, the DR354-0 Chip Inductors from Datatronic Distribution feature a miniature design that delivers superior performance and value in high frequency circuit designs for a wide range of electronic equipment.
Overvoltage Protection Regulator from Linear Technology protects high availability systems
Linear Technology has introduced the LT4356, an overvoltage protection regulator, with overcurrent protection and inrush current limiting for high availability systems. In applications where electronic systems must cope with high voltage surges of short duration, such as load dump in automobiles, the LT4356 provides solid front-end protection for valuable, safety critical downstream components. The wide input operating range of 4V to 80V enables continuous operation during cold crank conditions where the battery voltage can be as low as 4V. With its high input voltage rating, the LT4356 can handle transient voltages of 100V and higher, and provides reverse input protection to -30V without damage to itself or the load. The LT4356 lends itself well to automotive, industrial and avionics applications, as well as positive high voltage distributed power Hot Swap systems.
Tyco's Polyswitch features small form factor
Tyco Electronics has announced an addition to its PolySwitch resettable PPTC (polymeric positive temperature coefficient) devices surface-mount product family. Useful for the latest generation of high frequency data ports, I/O ports and storage devices, the picoSMD035F device offers circuit designers the smallest PPTC overcurrent protection device available for consumer and computer electronics.
IEC approved UMF fuse in 1206 package from Arrow
Now available from Arrow, the Schurter USI 1206 is the industry's first IEC approved Universal Modular Fuse in a 1206 footprint. In addition to conformance to IEC 60127-4/2, the device bears international approvals by cURus, METI and CCC. The new fuse series has high melting I²t values, which provides greater withstand against inrush or pulse currents. In lower overcurrent conditions its opening time compares to 1206 time-delay types according to UL; but it also responds very quickly to higher overcurrents in the event of a fault condition.
Battery Charger front-end IC increases system safety when charging a cell phone
Texas Instruments has introduced today a family of battery charger front-end integrated circuits, which dramatically increases protection when charging a cell phone or other portable electronic device. The 2 mm x 2 mm safety circuits protect a system from input over-voltage, over-current and battery over-voltage conditions, which may result from a power spike during charging, or a defective or incorrect wall adapter.
16V 250 mA LDO from Microchip
Microchip has announced the MCP1703 Low Dropout Regulator (LDO)—a 250 mA LDO with low quiescent current of just 2μA and high input voltage of up to 16V. The new LDO features device- and circuit-protection capabilities including over-voltage protection and thermal shutdown. The MCP1703 also offers highly accurate output-voltage regulation, including +/- 2 percent over-temperature accuracy, helping to ensure smooth, reliable system operation.
Efficient, low-loss synchronous rectification
The European distributor ECOMAL has introduced the first Schottky barrier rectifiers from Vishay Technology which use trench MOS technology. These devices appear in the equivalent circuit diagram as an MOS element and Schottky metal in parallel. New environmental guidelines including EUP (Energy – Using – Products 2005/32/EC), which are intended to save as much energy as possible and minimize the tolerable losses in the overall system, require highly efficient circuit designs.
4.5V-20V Load Switches are perfect for Circuit Protection and Power Management Designs
Fairchild Semiconductor has announced the FPF250X series, a new family of its IntelliMAX devices with input voltages ranging from 4.5 up to 20V. These highly integrated load switches provide full protection against potentially damaging overcurrent conditions affecting low-power designs including industrial, telecom, medical, notebook and consumer applications. The FPF250X devices simplify design, reduce component count and minimize board space by integrating a 0.23 Ohm current-limited N-channel MOSFET with protection and control features such as thermal shutdown, controlled turn-on and undervoltage lockout, into a space-saving SOT-23 package. Available in either adjustable or fixed current-limiting options, the FPF250X series offer design flexibility while minimizing circuit tuning and troubleshooting, accelerating time to market in numerous power management and circuit protection applications.
L-C Protection Devices for Color LCDs in 3G Handsets
Semtech Corp has announced the EClamp239xP, the newest addition to Semtech's EMIClampTM protection portfolio. The EClamp239xP is a series of inductor-capacitor (L-C) protection devices featuring greater attenuation, steeper amplitude roll-off, and lower clamping voltage needed for high-performance color LCD interfaces in GSM and CDMA-based 3G handsets. The EClamp239xP series includes the four-line EClamp2394P, the six-line EClamp2396P and the eight-line EClamp2398P. The EClamp239xP's 5-pole L-C filter network has inductor values of 19nH and capacitor values of 12pF, enabling the devices to offer minimal attenuation in the passband and 30 dB minimum attenuation from 800 MHz to 2.7 GHz, ideal for 3G-based mobile phones.
NIC adds SMT chip fuses to its product offering
NIC Components' comprehensive portfolio of passive components now includes safety agency certified surface mount chip fuses. The NFCC, NFHC and NFSC series provide an ultra-miniature solution to circuit protection applications in a wide range of electronics equipment.
ESD Protection for High-Speed Applications
Semtech has announced two new additions to its RailClamp family of low capacitance protection devices that provide system designers a new option for adding critical power protection to high-speed lines without the high clamping voltage and high capacitance limitations of competing solutions. RClamp1502B and RClamp2402B are designed with an ultra-low capacitance of 0.6pF to protect high-speed data lines without signal attenuation. The devices also have low clamping voltages to reduce stress on the protected IC that are very susceptible to ESD and CDE threats. The RClamp1502B protects two 15V lines and the RClamp2402B protects two 24V lines. Both devices protect two lines and are targeted for interfaces operating up to 1GHz, such as IEEE 1394 (FireWire), high-power USB, or ADSL input/output lines.
Ultra High Speed ESD Protection Diodes
Toshiba Electronics Europe (TEE) has announced the first device in a new Ultra High Speed family of ESD protection diodes aimed at interface protection applications for high-speed data ports, for example, USB2.0 interfaces. With handheld and portable devices, including mobile phones and digital cameras, integrating ever more functionality into increasingly smaller form factors, providing electrostatic discharge protection becomes even more important.
Combined Thermal Fuse/Resistor Acts Fast
ATC Semitec's SEFUSE D6X is said to offer a new concept in thermal fuse technology. By combining a thermal fuse element and resistor on a single substrate, NEC has created a fast-acting ultimate protection device for high power DC applications upto 12A/32VDC.
Device Helps Protect Electric Motors and Transformers from Overcurrent and Overtemperature
Raychem Circuit Protection, a business unit of Tyco Electronics, has announced the introduction of its PolySwitch LVR series of resettable circuit protection devices. PolySwitch LVR devices help protect electric motors and transformers used in commercial and home appliances from failures caused by mechanical overloads, overheating, stall, lost neutral and other potentially damaging conditions.
5V Protection Device with Flow Through Design For Easy Board Layout from Semtech
Semtech has announced the uClamp 0524P, the first 5V electrostatic discharge protection device with a flow through design. The four-line device is ideal for portable systems and replaces four separate discrete components, saving both cost and board space.
Avago's Optocouplers Target Industrial Applications
Avago Technologies has announced a new family of multi-channel phototransistor optocouplers to complement its existing single-channel product line. The company is a leading supplier of innovative semiconductor solutions for advanced communications, industrial and commercial applications.
Avago Expands Dual-Supply Voltage Optocoupler Family
Avago Technologies has announced the latest addition to its line of high-speed digital CMOS optocouplers. At 25 Megabaud (MBd), the new ACPL-772L is the industry's fastest, dual-supply voltage (3.3 V and 5 V) optocoupler in a DIP-8 package. With its unprecedented speed and the ability to support up to 5 kV in isolation voltage protection, the ACPL-772L is ideal for not only high-speed data-line transmission applications, but also those operating in higher voltages, such as test and measurement products. Avago is a leading supplier of innovative semiconductor solutions for advanced communications, industrial and commercial applications.
