Wirewound resistors cover many applications

IRC Wire and Film Technologies Division offers a series of moulded and conformally coated wirewound resistors and combination resistor/fuses.

Providing design engineers with a family of components for both general purpose and circuit protection applications, TT Electronics IRC Wire and Film Technologies Division offers a series of moulded and conformally coated wirewound resistors and combination resistor/fuses.

Designated the SP and SPP Series resistors, the product family consists of the SP20F (1W moulded fusible resistor); the SPF Series (2W moulded fusible resistor); the SP20 Series (1W moulded general purpose resistor); and the SPH (2W general purpose moulded resistor).

The SPP Series are conformally coated, available in 1, 2 and 3W power ratings.

According to Keith Chipman, Product Manager for IRC Wire and Film Technologies Division, more companies are specifying the devices in both fusing and general purpose circuits.

"We've experienced increased demand from our European customers for these types of fusible resistors", said Chipman.

Applications for the SP and SPP Series wirewound resistors include power supplies, motor controllers, televisions, consumer electronic products and appliances.

The SP/SPP Series resistors are available in power ratings of 1, 2 and 3W.

Standard resistance ranges from 0.1 to 2400ohm, depending on power rating, with standard tolerances to +/-5 and +/-10%.

IRC will also produce devices outside these specifications to meet customer requirements.

Customers may contact the factory for special pulse energy or fusing requirements.

The SP20/SP20F and SPH/SPF are constructed by winding a metal alloy resistance wire around a glass-fibre core.

End caps with welded leads are crimped to the wound core, then the units are encased in a moulded phenolic shell.

The SPP is similarly constructed, but uses a conformal silicone coating instead of a phenolic shell.

The fusible versions feature a flame resistant coating.

Typical pricing for the SP20/SP20F and SPH/SPF Series resistors is US $0.13 to $0.19 each in quantities of 10,000.

The SPP Series resistors are typically priced at US $0.10 each in quantities of 10,000.

Lead times for the SP and SPP devices are from stock to 6 weeks.

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