TT Electronics/IRC Supplier Page

Open Air Sense Resistors


Open air sense resistors provide reliable over-current protection


TT Electronics-IRC OARS-XP SeriesTT Electronics/IRC provides their OARS-XP series metal element resistors, with the ability to withstand high surge currents and extreme temperature cycling environments. The devices are specified for PWM control circuits and motor controllers as well as fault detection and power factor correction (PFC) circuits.

The OARS-XP series resistors consist of a flameproof 0.25 inch wide metal element resistance alloy welded to compliant copper terminals designed to compensate for the TCE (thermal coefficient of expansion) mismatch between the device and the PC board. Unlike other resistor technologies, such as thin film/thick film chips or foil devices, the alloy used in the open air metal element provides stable resistance values that will not experience degradation of performance at extreme temperatures (even at high temperatures). Its unique open-air design allows the heat to be dissipated into the air rather than conducted to the PC board where thermally-sensitive components are located. Datasheet

Features Applications
  • Flameproof
  • Superior thermal expansion cycling
  • Lead flexible for thermal expansion
  • Inductance less than 10 nH, with operating
    temperatures ranging from -40°C to +125°C
  • Current sense
  • Power supplies
  • Stalled motor sensor
  • Feedback and gain control
  • Input resistor for PWM circuit

Digi-Key P/N Manufacturer P/N Description
989-1015-1-ND OARSXPR001FLF RES .001 OHM 5W 1% FLAT SMD
989-1016-1-ND OARSXPR002FLF RES .002 OHM 5W 1% FLAT SMD
989-1017-1-ND OARSXPR005FLF RES .005 OHM 5W 1% FLAT SMD
989-1018-1-ND OARSXPR010FLF RES .010 OHM 5W 1% FLAT SMD
989-1019-1-ND OARSXPR020FLF RES .020 OHM 5W 1% FLAT SMD
989-1020-1-ND OARSXPR025FLF RES .025 OHM 5W 1% FLAT SMD
Available in Tape & Reel (2-ND), Cut Tape (1-ND), and custom Digi-Reel® (6-ND)