Alternative to wirewound resistors

Vishay has released a new series of thin film precision single in-line resistors with resistance tolerance down to +/-0.01% over a range of 50 kilohms to 10 megohms.

Vishay Intertechnology has announced the release of a new series of thin film high-value precision single in-line resistors with resistance tolerance down to +/-0.01% over a range of 50 kilohms to 10 megohms.

The new Vishay Thin Film HVPS series of discrete resistors is intended for instrumentation amplifiers and precision voltage dividers in products such as medical and test equipment requiring high precision over a broad resistance range. According to Vishay, HVPS devices offer designers compact and readily available alternatives to the wirewound resistors previously required for such applications.

In addition to precision performance over a high-value resistance range with a very low resistance tolerance, the thin film resistors provide stability of 500ppm (2000 hours at +70 degrees C) and temperature coefficient ratio (TCR) values of 25ppm/degrees C, 15ppm/degrees C, 10ppm/degrees C, and +/-5ppm/degrees C.

The HVPS1 is available with a working voltage of 250V, a power rating of 0.125W, a resistance range of 50 kilohms to 5 megohms.

The HVPS2 is rated for a working voltage of 300V, a power rating of 0.250W, and a resistance range from 100 kilohms to 10 megohms,

A flame-resistant conformal coating that meets the UL94V-X rating protects epoxy body of the resistors, each of which also features a 99.6% alumina substrate, a TAMELOX (passivated nichrome) resistive element, and two copper terminals with a nickel barrier. Both resistor options are rated for an operating temperature range of -55 degrees C to +125 degrees C.

Samples and production quantities of the new high-value precision resistors are available now, with a lead-time of 10 weeks for larger orders.

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