Automotive varistors provide off-state EMI/RFI attenuation

28th January 2015
Source: AVX
Posted By : Barney Scott
Automotive varistors provide off-state EMI/RFI attenuation

A series of high temperature, low leakage automotive varistors, suitable for use in under-bonnet applications such as Transmission Control Units (TCUs), Brake Control Modules (BCMs), data lines, bus interface units, and other capacitance sensitive applications, has been introduced by AVX. 

Qualified to AEC-Q200, the high temperature, low leakage CANATL series automotive controlled area network varistors exhibit extremely low leakage (equal to or less than 1µA at 32VDC and 25°C) and are tested, qualified, and specified at 150°C.

Based on AVX’s MultiLayer Varistor (MLV) technology, which combines circuit protection and EMI/RFI attenuation functions in a single, high reliability device, CANATL series automotive varistors are ZnO-based ceramic semiconductor devices that exhibit non-linear, bi-directional voltage current characteristics similar to back-to-back Zener diodes and an EMC capacitor in parallel.

In addition to the space savings provided by enabling EMI/RFI attenuation in the off-state, CANATL series multilayer varistors provide several valuable performance advantages over diodes, including an inrush current capacity of 8x20µS, a high 25kV (HBM Level 6) ESD rating, low capacitance of 10pF to minimise signal distortion and no derating over operating temperatures. Very fast response times conservatively clamp the energy before it reaches its maximum.

CANATL series varistors exhibit multi-strike capability, excellent solderability, and an impressive FIT rate of under 0.1 per billion hours.

“By extending our CAN Bus varistor offering with the CANATL series high temperature, low leakage automotive varistors, we have significantly expanded the number of applications that can benefit from the space savings and performance advantages inherent to AVX’s patented MLV technology,” said Jiri Machanicek, Product Manager, AVX.

Rated for use in temperatures spanning -55 to 150°C, CANATL series automotive varistors are currently available in a 0603 case rated for 32VDC operating voltage. RoHS compliant, CANATL series varistors are supplied with Ni barrier/100% Sn terminations and packaged on 7” or 13” reels. Pd/Ag terminations for hybrid assembly are available upon request, and current lead time for the series is 14 weeks.

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