New Industry Products

High Pulse Withstanding Resistors offer High Stability and Reliability

January 11, 2018 by Paul Shepard

TT Electronics today announced the HPWC (high pulse withstanding chip) range of high energy surge resistor products. The high pulse resistors are designed to maximize the level of surge performance available in a single-sided flat chip design.  The HPWC range is designed for protection and discharge applications in compact power supplies and power control circuits where a resistance tolerance of five percent is required.

Available in four sizes from 0805 to 2512, HPWC resistors withstand up to 6.5kV peak for a 1.2/50us surge and up to 3kW for a 0.1ms pulse. The product is essentially an evolution of TT Electronics’ PWC (pulse withstanding chip) resistors but where the resistance value is adjusted by precise process control rather than by laser trimming.

This process maximizes and improves the level of surge performance available in a single-sided flat chip design. Resistance values available are from 1R0 to 100K, and there are four sizes from 0805 to 2512, with ratings from 0.25 to 2W.

Providing enhanced ability to absorb high energy surges, these high energy chip resistors are suited for power supplies, circuit breakers, motor drives and medical monitor input protection.  As such, the thick-film resistors are aimed at designers of compact SMD circuits in power conversion, motion control and protection applications in the industrial and medical markets.

Factors driving the demand for this type of product are the growth in distributed power management and motion control in industrial and automated systems, and pressure to reduce size and weight while increasing surge protection for EMC regulatory compliance and product reliability.

TT Electronics’ HPWC resistors’ compact PCB footprint minimizes use of valuable PCB area, while the absence of laser trimming means no current crowding and a consequential avoidance of hot spots, improving product reliability.

As a single-minded proposition from a buyer/specifiers perspective, TT Electronics’ HPWC resistors provide leading levels of surge protection within a given PCB footprint while saving space and enhancing reliability.