Wirewound resistors target electric-vehicle applications

Vishay Intertechnology, Inc. has introduced a series of AEC-Q200 qualified, chassis-mount wirewound resistors for electric-vehicle (EV) applications. The Vishay Dale RHA series resistors operate as pre-charge and discharge resistors in EVs, in addition to voltage dividers in taillights and current limiters in dimming circuits for interior lighting.

The wirewound resistors mount directly onto a chassis to use the heat-sink effect, said Vishay. The devices feature a completely welded and molded construction for total environmental protection, and operate over a temperature range of -55°C to 250°C.

The RHA series devices –  the RHA005, RHA010, RHA025, and RHA050 – offer high power ratings up to 50 W in four small package sizes. They also provide tight tolerance down to ±1%, a temperature coefficient of resistance (TCR) as low as 20 ppm/°C, and a wide resistance range from 0.1 kΩ to 39.2 kΩ for high accuracy and stability. The TCR is ±20 ppm/°C  for 10 Ω and above, ±50 ppm/°C for 1 Ω to 9.9 Ω, and ±100 ppm/°C for 0.1 Ω to 0.99 Ω.

Device specification table:

Click for a larger image. (Source: Vishay Intertechnology)

The RHA series is RoHS-compliant, halogen-free, and Vishay Green. Samples and production quantities are available now, with lead times of eight to 12 weeks. Pricing for U.S. delivery starts at $1.61 for 100 pieces in the RHA005 size.