Substrates and thick film resistive ink resistors

22 November 2000 Passive Components

Pecos (porcelain enamel coating on steel) is a revolutionary ceramic capability of insulating common steel with a patented ceramic material and process to produce substrates of large sizes and unique shapes. The manufacturer, Ohmite, says the steel core provides the strength and heat dissipation to enable the designer to incorporate structure and circuit in the same component. Typical examples are power resistors and snubber circuits.

The ability to produce large substrates (currently 30,8 by 38 cm) with heat dissipation of 2,33 W per square cm, in free air enables the designer to incorporate many smaller circuits together, with higher density, thus eliminating interconnects, mounting hardware and labour cost.

The ceramic process enables substrates to have through-holes with good dielectric insulation (500 V) to provide two-sided circuits, mechanical assembly and mechanical termination. It does not require the metal form to be flat; however, the circuit area must be flat if screen printing is required.

The resistors feature: wide resistance range (0,25 W-250 kW); low inductance (50 nH at 1 MHz); tight tolerance (1% standard - others available); PCB mountable, other terminations available; 11 different wattage sizes (8-100 W or higher); special shaps and sizes on special order.

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