Foil resistors feature 10? to 125k? resistance

Vishay Precision Group Inc. has pushed out the door a new series of ultra-high-precision Bulk Metal foil chip resistors that the company says offers flexible terminations. The devices boast low TCR of 2ppm/°C typical from -55°C to 125°C, 25°C ref., and load-life stability to 0.01 percent at 70°C for 2,000 hours at rated power.

Offered in 1206, 2010 and 2512 chip sizes, the VSMF series features a wide resistance range from 10? to 125k?, with tolerances to 0.01 percent. Any resistance value within this range is available at any tolerance with no additional cost or lead-time effect. The devices provide a power rating to 400mW at 70°C and withstand electrostatic discharge (ESD) to at least 25kV. The resistors deliver rise time of 1ns with no ringing, a thermal stabilization time of less than one second (nominal value achieved within 10ppm of steady state value) and current noise of 0.010?V rms per volt of applied voltage (less than -40dB), said Vishay. The devices also offer voltage coefficient of less than 0.1ppm/V and a thermal EMF of 0.05?V/°C. The RoHS-compliant foil resistors offer a non-inductive (less than 0.08?H), non-capacitive design.

The VSMF series eliminates the problems of cracked substrates and board delamination by providing flexible terminations for strain relief, thereby increasing reliability. In addition, the Bulk Metal foil resistor has documented more precise load-life stability than any MIL-qualified resistor, claimed Vishay. This is because the resistor's element is a bulk metal alloy that has been applied to a substrate with a unique process that results in a stress-free adhesion. The adhesion is maintained throughout the manufacturing process, including termination welding, encapsulation, marking and curing.

Samples and production quantities of the VSMF series are available with lead times of five days for samples and eight weeks for standard orders.