Vishay VCS1625ZP Z-Foil surface-mount current-sensing chip resistor

The Vishay VCS1625ZP Z-Foil surface-mount, current-sensing chip resistor has a power rating of 1 W at +70°C and low TCR of ±0.2 ppm/°C typical from -55 to +125°C, +25°C ref. By dissipating up to 1 W in the 1625 package size, the resistor allows designers to use a single device to measure larger currents than previously possible. 

For high-power applications, the device offers tight tolerances to ±0.2% (0.1% and 0.05% are available) and a four-terminal Kelvin configuration for increased accuracy.

The resistor features a power coefficient of 5 ppm at rated power, a thermal stabilisation time of <1 ns (nominal value achieved within 10 ppm of steady state value), and a wide resistance range from 0.3 to 10 Ω. Any resistance value within this range is available at any tolerance with no additional cost or lead time effect. The resistor offers a rise time of 1.0 ns with effectively no ringing, short time overload of <0.005% (50 ppm), current noise of 0.010 µVrms/V of applied voltage (<-40 dB), and a voltage coefficient of <0.1 ppm/V.

The device withstands ESD to at least 25 kV and offers a non-inductive (<0.08 μH) and non-capacitive design. The Bulk Metal Foil technology of the resistor provides a significant reduction of the resistive component’s sensitivity to ambient temperature variation (TCR) and to the self-heating effect caused by changing loads. This allows designers to guarantee a high degree of stability and accuracy in fixed-resistor applications. In addition, the resistor's design results in a very low thermal EMF of 0.05 μV/°C typical, which is critical in precision applications.

The resistor’s load-life stability of 0.015% at +70°C for 2000 hours at rated power is an order of magnitude better than typical current sensing resistors. This makes it suitable for tightened-stability reference voltage and precision current sensing applications in forced-balance electronic scales, measurement instrumentation, bridge networks, motor controllers, and medical and test equipment. In addition, the resistor can be tested in accordance with EEE-INST-002 (MIL-PRF 55342) for military and space applications.