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TT Electronics OAR Open Air Format Current Sense Resistors

TT Electronics OAR open air resistors are metal element current sense resistors (shunts) that feature a superior surge performance. Available with power ratings of 1, 3 and 5W (at 85°C), a tolerance of 1% and an element TCR of +/-20ppm/°C, they elevate the hot spot from the PCB thanks to their unique construction. Thus, they isolate the hotspot from the circuit board material, preventing damage to the PCB and enhancing the reliability of surrounding components. Furthermore they require only a very small two-point footprint on the PCB, freeing up real estate between the terminals to be populated with other components.

Features

Power ratings of 1, 3 and 5 W @85°C
Superior surge performance
Hot spot isolated from PCB material
Resistance values from 2.5 to 100mΩ
Resistance element TCR +/-20ppm/°C
Tolerances to 1%
Inductance below 10nH
Operating temperature from -40 to +125°C
Choice of standard or narrow pitch version
Enhances reliability by avoiding heating of the PCB
Frees up PCB real estate between terminations

Applications

All applications that require measurement of the flow of current in electronic systems
Battery-powered equipment
Battery chargers
Power supply current limiting
Small motor stall monitoring
Electrical actuator control
Industrial control systems

Technical Specifications

Parameters	Values
Resistance wire TCR	±20ppm/°C
Load Life (1000 hours @ 25°C)	ΔR/R <1%
Moisture (no load for 1000 hours)	ΔR/R <1%
Temperature Cycling (-40°C to +125°C for 1000 cycles)	ΔR/R <1%
Operating Temperature	-40°C to +125°C