Matched-pair resistor networks offer tight ratio tolerance

December 17, 2012 // By Christoph Hammerschmidt
For automotive applications requiring highly precise resistors, Vishay Intertechnology developed the MPMA series of precision matched-pair resistors. These resistor networks are AEC-Q200-qualified and packaged in a compact molded surface-mount SOT-23.

resistor film with enhanced passivation on a high purity alumina substrate. The MPMA device is resistant to moisture at + 85 °C, 85 % relative humidity, and 10 % rated power per MIL-STD-202, method 202.

Offering higher precision matching capability than discrete SMT chips, the AEC-Q200-qualified dividers provide low TCR tracking of ± 2 ppm/°C and tight ratio tolerance to ± 0.05 %, with excellent long-term ratio stability over time and temperature.

The MPMA series provides a resistance range from 250 Ω to 50 kΩ with divider ratios from 1:1 to 50:1. With their standard SOT-23 package and wide range of common standard divider ratios, the devices are ideal for precision voltage divider, operational amplifier, and battery signal management applications in automotive, industrial, telecommunications, process control, and medical instrumentation equipment.

Offering a rugged molded case construction, the MPMA networks offer power ratings of 100 mW at + 70 °C per resistor, extremely low noise of < - 30 dB, low voltage coefficients of < 0.1 ppm/V, and a operating temperature range of - 55 °C to + 155 °C.

Available with lead (Pb)-free terminations, the resistor networks are RoHS-compliant. Samples of the MPMA series are available now, with lead times of eight to 10 weeks.