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CSM Series Resistors


Vishay Foil presents CSM ultra-precision, surface-mount, current-sensing resistors


Vishay Foil Resistors' CSM Series Resistors Vishay Foil Resistors announced that it has enhanced the CSM series of ultra-precision, surface-mount, current-sensing resistors in the compact 2512 and 3637 case sizes. The improved devices offer a standard TCR of ± 15 ppm/°C max. (-55°C to + 125°C, + 25°C ref.), with ± 10 ppm/°C max. available on request, and an extended resistance range down to 1 mΩ.

The CSM features a low thermal electromotive force (EMF) that is critical in many precision applications. The device’s all-welded construction is composed of a Bulk Metal® resistive element with welded copper terminations, plated for soldering. The terminations make true ohmic contact with the resistive layer along the entire side of the resistive element, thereby minimizing temperature variations. The resistor element is designed to uniformly dissipate power, thus minimizing parasitic contact resistance, and contact resistance variation for a low thermal EMF of 3 μV/°C.

Traditional passive current sensors and shunts generate heat under power, which changes their resistance, and thus their voltage output. The CSM’s low absolute TCR reduces errors due to temperature gradients, thus reducing a major source of uncertainty in current measurement. The CSM can withstand unconventional environmental conditions, including the extremely high temperatures and radiation-rich environments of down-hole oil exploration and well logging, or the deep-sea underwater repeaters in cross-ocean communications.

Featuring a four-terminal (Kelvin) design, load-life stability to ± 0.2% at 70°C for 2000 hours at rated power (typical current sensing resistors offer a load-life stability of ≥ 0.5% through a 1000-hour workload), and available with screening in accordance to EEE-INST002 (MIL-PRF 55342 and MIL-PRF 49465), the devices provide high stability and performance in precision current-sensing applications. Datasheet

Digi-Key P/N Manufacturer P/N Description
Y1473-.005ACT-ND Y14730R00500B0R RES .005 OHM 3W .1% FOIL 3637
Y1473-.02BCT-ND Y14730R02000B0R RES .02 OHM 2W .1% FOIL 3637
Y1473-.05BCT-ND Y14730R05000B0R RES .05 OHM 2W .1% FOIL 3637
Y1487-.005-ND Y14870R00500B9W RES .005 OHM 1W .1% FOIL 2512
Y1487-.01-ND Y14870R01000B9W RES .01 OHM 1W .1% FOIL 2512
Y1487-.05-ND Y14870R05000B9W RES .05 OHM 1W .1% FOIL 2512
Y1487-.1-ND Y14870R10000B9W RES .1 OHM 1W .1% FOIL 2512
Y1488-.001ACT-ND Y14880R00100D9R RES .001 OHM 3W .5% FOIL SMD
Y1488-.002BCT-ND Y14880R00200B9R RES .002 OHM 3W .1% FOIL SMD
Y1488-.005BCT-ND Y14880R00500B9R RES .005 OHM 3W .1% FOIL SMD
Y1488-.005CCT-ND Y14880R00500F9R RES .005 OHM 3W 1% FOIL SMD
Y4487-.1ACT-ND Y44870R10000F9R RES .1 OHM 1W 1% FOIL 2512