Varistors protect at higher temperatures

SMD multilayer varistors are well suited for industrial and high-temperature controls for ESD, switching and inductive transient protection on circuit boards and ICs.

Stackpole Electronics, though its strategic alliance with Keko Varicon, introduces the ZVY and AVY series SMD multilayer varistors designed for maximum operating temperatures up to 150C.

Most multilayer varistors are only rated for operation up to 85C, and recently there have been increasing numbers of varistors designed for operation up to 125C.

However, automotive and industrial control market trends have driven the need for low-voltage transient protection for temperatures above 12C.

The RoHS-compliant ZVY and AVY series fulfil this emerging market trend.

"We have recently seen an increase in demand for transient voltage protection devices at temperatures above 125C, especially in Europe", says Kory Schroeder, Product Engineering Manager at Stackpole.

"And in the United States, the automotive industry required varistor protection at these elevated temperatures for some time, but technology was not able to meet those needs until now".

The ZVY series is a SMD varistor that is an extension of the ZV series low-voltage SMD multilayer varistors.

It is available in sizes 0603, 0805, 1206, 1210, 1812 and 2220.

Operating voltages range from 3 to 170V DC, and from 2 to 130V AC.

The ZVY series features low capacitance for a fast response time of less than two nanoseconds.

This product has a wide range of current and energy handling capabilities and can be customised for special current, energy or capacitance requirements.

The ZVY varistors are well suited for industrial and high-temperature controls for ESD, switching and inductive transient protection on circuit boards and ICs.

The AVY series is a SMD varistor that is an extension of the AV series of automotive multilayer SMD varistors.

This product is similar to the ZV series but designed specifically for the standard automotive voltages of 12V, 24V and 42V.

It is available in sizes 0805, 1206, 1210, 1812, 2220 and 3225, and is characterised for five minutes at Vjump and for 10x load dump energy (WLD), which are critical for the automotive industry.

The AVY series has low capacitance for fast response time of less than two nanoseconds.

It has a broad range of current and energy handling capabilities, and is customisable to fit any special requirements for current, energy or capacitance.

The AVY varistor is ideal for all automotive transient protection needs, and offers more layout flexibility for the design engineer since it uses less space than silicon TVS diodes.

Pricing depends on size and voltage, and typically ranges from $0.15 to $0.50 for 10,000 pieces and greater.

Lead times are currently eight to 10 weeks.

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