Vishay Precision Group has released new high-precision Z-Foil power current sensing resistors for applications where rapid R stabilisation and resistance stability under transient power conditions are required.
Designed to provide optimal performance when mounted on a chassis or cooled heatsink, the VCS331Z, VCS332Z, VFP4Z and CSNG series feature low TCR of ±0,2 ppm/°C from -55°C to +125°C, +25°C ref., PCR (R due to self-heating) of 4 ppm/W typical, and tolerances to ±0,01%.
For high-power applications, the devices offer power ratings up to 10 W (on heatsink) and a four-terminal Kelvin configuration in order to remove the unwanted influence of lead resistance and lead sensitivity to temperature.
The resistors offer load-life stability to ±0,005% typical (50 ppm) at 3 W (heatsink) and +25°C for 2000 hours, a thermal stabilisation time of <1 s (within 10 ppm of steady state value) and a wide resistance range from 0,25 Ω to 500 Ω (lower and higher values are also available.) Any resistance value within this range is available at any tolerance with no additional cost or lead time effect.
The resistors offer a rise time of 1,0 ns with effectively no ringing, current noise of 0,010 μVrms/V of applied voltage (<-40 dB) and a voltage coefficient of <0,1 ppm/V. They withstand ESD to at least 25 kV for increased reliability and offer a non-inductive (<0,08 H), non-capacitive design.
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