Power Electronics

Surge Resistors to Manage Overloads in Motor Control Circuits

TT electronics IRC Wirewound and Film Technologies Division recently introduced a surface-mount high-surge resistor for use in small motor control circuit designs in automotive and industrial applications. The rugged High Surge Film (HSF) Series resistor is uniquely designed to handle a pattern of overloads within the circuit, and IRC has been selected to supply its HSF resistors to a major Tier 1 automotive supplier.

The cylindrical design of the HSF resistor provides excellent heat dissipation and much higher surge/pulse capability than comparably rated flat chips. The part can also serve as a replacement for costly surface mount wire-wound resistors and is especially suited for harsh environment applications where heat and vibration are of concern.

“Based on discussions with design engineers with several customers, we identified a need for an extended surge component to serve in demanding safety critical applications,” explained David Winkler, IRC-WAFT product manager. “We developed a new product combining the economical cost structure of a film component and the surge capability needed by these customers. This resistor is especially attractive as a replacement for high cost surface mount wire-wound resistors.”

The HSF Series features a MetalGlaze thick film element fired at 1,000°C to a solid ceramic substrate and a high-temperature dielectric coating suitable for harsh automotive and industrial applications. The rugged HSF resistor is fully rated to 1 W at 70°C with a maximum operating temperature of 150°C. Available in resistance ranges from 10 Ω to 10 KΩ with 10% tolerance, the part features TCRs of ±50 and ±100ppm/°C. Devices outside these specifications may be available for special applications.

Typical pricing for the HSF resistor is $0.14 to $0.16 each in quantities of 100,000 pieces.

For more information, visit www.irctt.com.

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