TT ELECTRONICS WELWYN OAR-3 Series Current Sense Resistor, 0.03Ω, 3W, Metal, ±1

The TT ELECTRONICS WELWYN OAR-3 Series is a high-performance, through-hole current sense resistor, engineered for precise measurement and reliable power management in demanding electronic circuits.

Featuring a robust metal strip element, this resistor offers a very low resistance value of 0.03Ω with a tight tolerance of ±1%. It is designed for open-air mounting (OAR), providing excellent heat dissipation to achieve its full 3W power rating. The construction isolates the primary hot spot from the PCB material, enhancing long-term reliability and protecting your board.

A key advantage is its exceptional stability across temperature variations, characterised by a low Temperature Coefficient of Resistance (TCR) of ±20ppm/°C. This ensures consistent performance from -40°C to +125°C. The component also boasts superior surge performance, handling transient overloads effectively, and is rated for an endurance life of 1000 hours at 25°C.

Part of the proven OAR series, these radial leaded resistors are suitable for a broad range of low-resistance sensing applications, from power supplies and motor controls to battery management and industrial instrumentation. Their through-hole design facilitates secure PCB mounting for vibration-resistant installations.

With its combination of precision, power handling, and thermal stability, this current sense resistor is a dependable choice for engineers seeking accuracy and durability in their designs.