Encapsulated multilayer varistors are rated for 150°C operation

November 25, 2019 //By Christoph Hammerschmidt
Encapsulated multilayer varistors are rated for 150°C Operation
Designed for use in high-temperature, high-energy, & harsh-environment automotive, industrial, & oil & gas applications, the new TransGuard Automotive VGAH Series MLVs provide bidirectional overvoltage protection & broadband EMI/RFI filtering in a single, high-reliability SMT device.

AVX Corp. has released a new series of high-temperature, glass-encapsulated multilayer varistors (MLVs) that are qualified to AEC-Q200, rated for operating temperatures up to 150°C, and designed for use in a wide variety of high-energy, harsh-environment automotive underhood, industrial, and oil and gas applications.

Comprised of zinc oxide (ZnO) based ceramic semiconductor devices with nonlinear, bidirectional voltage-current (V-I) characteristics similar to those of back-to-back Zener diodes, but with greater current and energy handling capabilities and the addition of EMI/RFI attenuation, the TransGuard Automotive VGAH Series High-Temperature, Glass-Encapsulated MLVs combine bi-directional overvoltage circuit protection and EMI/RFI filtering functions in a single, high-reliability SMT device. The series also exhibits high current- and energy-handling capabilities, sub-nanosecond (<1nS) response times to ESD strikes, multiple-strike capabilities, high energy absorption/load dump, low leakage, and excellent solderability. Additional benefits include glass encapsulation for impermeable protection against harsh environments and processes, including acids, salt, and chlorine flux, and no derating requirements for energy and current over the full range of operating temperatures extending from -55°C to +150°C. 

Available in five chip sizes with 16–31VDC working voltages, 40–57V clamping voltages, 0.6–13J energy ratings, 1.5–50J load dump energy, 200–1,800A peak current ratings, and 700–15,000pF capacitance, these MLVs are designed for use in high-temperature, harsh-environment DC motor, pencil coil, local interconnect network (LIN) bus, electrical control unit (ECU), turbocharger, sensor, and relay applications in commercial, hybrid electric (HEV), plug-in hybrid electric (PHEV), and internal combustion engine (ICE) vehicles. The series is also ideal for use in a wide range of high-temperature, harsh-environment industrial applications, including power tools, automation and downhole drilling equipment, and renewable energy systems. 

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