High temperature Multi Layer Varistors rated for 150°C operation

17th January 2020
Lanna Cooper


AVX has released a new series of high temperature, glass-encapsulated Multi Layer 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 new 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, very fast, sub-nanosecond (less than 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 (1206, 1210, 1812, 2220, and 3220) 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, the new automotive-qualified VGAH Series MLVs are well suited 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 suitable 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.

“AVX’s new TransGuard Automotive VGAH Series High Temperature, Glass-Encapsulated Multilayer Varistors further extends its portfolio of high reliability solutions for high temperature, high energy, and harsh environment applications in the automotive, industrial, and oil and gas industries,” said Jiri Machanicek, Product Marketing Manager for Circuit Protection at AVX.

“The new VGAH Series MLVs provide TVS protection in their on-state and broadband EMI/RFI filtering in their off-state, don’t require any current or energy derating over the entire range of rated operating temperatures, which spans -55°C to 150°C, and have a compact form factor that ruggedly withstands harsh-environment conditions and processes and satisfies increasingly common demands for lightweight, space-saving, multifunctional components.”

The new VGAH Series High Temperature, Glass-Encapsulated MLVs also have RoHS-compliant nickel-barrier-over-pure-tin (Ni/Sn) terminations, are compliant with the ESD performance requirements defined in the AEC-Q200, IEC 61000-4-2, and ISO 10605 standards, and are supplied on 7” or 13” tape and reel for automated placement. Lead-time for the series is currently 14 weeks.

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