1W chip resistor delivers low TCR to ±2 ppm/°C

Vishay Precision Group Inc.'s Vishay Foil Resistors division recently released a ultra-high-precision Foil surface-mount current sensing chip resistor with low TCR of ±2 ppm/°C from -55 °C to +125 °C, +25 °C ref., and tolerances to ±0.1% (0.01% and 0.05% are available). For high-power applications, the VCS1625P offers a power rating of 1 W at +70 °C and maximum 5 A current rating, and a four-terminal Kelvin configuration for increased accuracy.

The VCS1625P features a wide resistance range from 0.01 Ω to 10 Ω, with specific "as required" values within this range (e.g. 1.234 Ω vs. 1 Ω) available at no additional cost or delivery time. The resistor features 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, for increased reliability, and offers a non-inductive (<0.08 μH), non-capacitive design. The VCS1625P is offered with tin/lead or lead (Pb)-free gold or tin termination options, and with additional temperature treatments (PMO) to extend the operating temperature from +150 °C to well above +200 °C. The design of the VCS1625P allows for designers to use only a single device to measure larger currents than previously possible by dissipating up to 1 W in the same 1625 size package.

The Bulk Metal Foil technology of the VCS1625P provides a reduction of the resistive component's sensitivity to ambient temperature variation (TCR) and to the self-heating effect caused by changing loads. These capabilities allow designers to guarantee a high degree of stability and accuracy in fixed-resistor applications. The resistor's load-life stability at +70 °C at rated power is an order of magnitude better than typical current sensing resistors (0.015% after 2,000 hours versus 0.05% after 1,000 hours).

The device's improved stability 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 VCS1625P can be tested in accordance with EEE-INST-002 (MIL-PRF 55342) for military and space applications.

Key highlights:

• TCR of ±2 ppm/°C from -55 °C to +125 °C, +25 °C ref.
• Tolerances to ±0.1% (0.01% and 0.05% are available)
• Power rating of 1 W at +70 °C and maximum 5 A current rating
• Four-terminal Kelvin configuration
  
• Wide resistance range from 0.01 Ω to 10 Ω
• Rise time of 1.0 ns
• Short time overload of <0.005% (50 ppm)
  
• Current noise of 0.010 µVrms/V of applied voltage (<-40 dB)
• Voltage coefficient of <0.1 ppm/V
• Withstands ESD to at least 25 kV
  

Availability: Samples and production quantities, with lead times of five working days for samples, and six weeks for standard orders.

Datasheet: Click here.