Power Electronics

Chip Resistors Dissipate 50% More Power

TT Electronics IRC Advanced Film Division has developed a series of pulse withstanding thick-film resistors with improved power ratings in reduced chip sizes. The PWC Series thick-film resistors deliver up to 50% higher power ratings than conventional thick film resistors—up to 1.5 W in a standard 2512 size chip.

“We developed the PWC Series resistors to provide an economical alternative to bulky molded wirewound components or multi-chip solutions that consume valuable board space and may require additional placement costs,” said Gary Bleasdell, new business development manager for TT electronics IRC Advanced Film Division.

“To meet the increased demand for the PWC Series resistors, IRC’s Advanced Film Division will manufacture this product at its Corpus Christi, Texas, facility,” Bleasdell explained. “This will provide customers with a second source, since IRC’s sister division, Welwyn Components, also manufactures this part in the UK.”

Conventional thick-film resistors typically provide power ratings up to 1 W in a 2512 chip size. IRC is able to boost this power rating through a combination of proprietary thick-film materials and advanced manufacturing processes. The PWC Series resistors are available in four standard sizes (0805, 1206, 2010 and 2512) with power ratings from 0.125 W to 1.5 W, and limiting element voltage ratings for 100 V to 500 V. Resistance range is from 1 Ω to 10 MΩ, with tolerance down to 0.5%. TCRs are 100 ppm/°C for values over 10 Ω, and the operating temperature range is -55°C to +155°C.

The pulse withstanding capability of the PWC Series resistors ranges up to 5 kV for a 2512 size with 1.2/50 µs and 10/700 µs pulse shapes as defined by IEC 60-115-1. Typical pricing for the chip resistors is $0.29 in quantities of 10,000.

For more information, visit www.irctt.com.

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