Power Electronics
Precision Foil Current Sense Resistors Combine Low TCR With High Power Ratings

Precision Foil Current Sense Resistors Combine Low TCR With High Power Ratings

VPG announced that its Powertron resistor brand has introduced the first seven devices in its S Series of precision foil current sense resistors. Offering a TCR of ±2 ppm/°C - the industry's lowest for high-power current shunts - the SHR, SHS, SNR, and SPR devices provide power ratings to 80 W in a variety of epoxy packages.

The resistors released today offer a wide range of power ratings - from 1.5 W in free air to 80 W when mounted on a heatsink - with low resistance values from 0.002 Ω to 50 Ω and tight tolerances to ±0.1%. The devices feature maximum currents to 150 A, with higher values available upon request; very low inductance; thermal EMF of <1 µV/°C ; and a temperature range of -40 °C to +130 °C.

Providing exceptional load-life stability of ±0.1% typical after rated power at 70°C for 2,000 hours, S Series resistors provide highly accurate and reliable current sensing in power supplies, digital multimeters, current control systems, medical equipment, solar and wind inverters, AC/DC converters, and battery chargers. The RoHS-compliant devices are available in a wide range of package sizes, including the standard TO-220 and surface-mount version.

Samples and production quantities of the S Series current sense resistors are available now, with lead times of seven to eight weeks. Pricing starts at $4.67 per piece in 100-piece quantities.

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