SOT-packaged networks allow easy placement

A new series of small-outline-transistor-packaged precision thin-film resistive devices allows circuit designers to place a miniature three-resistor precision network virtually anywhere on a PCB.

A new series of small-outline-transistor-packaged precision thin-film resistive devices allows circuit design engineers to place a miniature three-resistor precision network virtually anywhere on a PCB.

The SOT143 Series feature absolute tolerances as low as 0.1% and ratio tolerances between the three resistive elements as low as 0.05%.

John Graham, Director of Marketing and Sales at Welwyn, said: "The SOT143 is a standard semiconductor package familiar to most circuit designers and it is ideal for housing our thin film resistive element, providing a low TCR precision resistor capable of handling 0.25W".

The SOT143 Series resistors are finding applications in precision dividers, battery-charging and feedback circuits in computers, instrumentation, power supplies and motor controls wherever precision networks are used.

Rated for a full 0.25W at 70C and 100V, the SOT143 Series resistor networks feature resistance values from 10ohm to 200kohm, in absolute tolerances to 0.1% (ratio tolerances to 0.05%); and with absolute TCRs (temperature coefficient of resistance) of 25ppm/C (TCR tracking to 5ppm/C).

Operating temperature range is from -55 to +125C.

The SOT143 Series resistors are available in three standard sizes (two series networks of three resistors, one isolated two-resistor network).

Each network consists of two or three thin film precision resistive elements, which can be matched in several ratios.

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