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In response to requests from power electronics design engineers

with the means to squeeze more current-sensing capability

into crowded power supply designs, Token Electronics has

developed a “tight pitch” version of its open air metal element

current sensing resistor with ratings as high as 5W in a

reduced PC board footprint and longer thermal path.

Designated the OAR Series, these open-air through-hole

devices offer a high current, flameproof alternative to

conventional axial devices and flat chips for current-sense

circuits where PC board space is at a premium. The resistor’s

footprint is reduced by extending the height of the device

above the board, thus keeping the resistor element’s “hot spot” safely off the PC board and providing for

increased air circulation under it, which in turn provides increased heat dissipation and cooler operation.

The OAR devices with increased height improve cooling efficiency, and because many power supply designs are

already tightly-packed at the PC board level, the additional height does not create any profile issues. The OAR

series resistors feature a reduced pitch, or spacing between the leads on the circuit board with a corresponding

increase in the board mounted profile.

The OAR Series resistors are power rated for 1W, 2W, 3W, or 5W at 85°C, with resistance values from 0.05Ω

to 0.005Ω, with tolerances down to ±1%. They feature TCRs as low as ±50ppm/°C and inductance values in the

single-digit nanohenry range (10 nH Max.). Operating temperature range is -40°C to +125°C. The flameproof

OAR resistors are constructed of a wire resistive element with welded copper leads to prevent solder wicking,

which can change the device’s resistance value in the circuit by as much as 30%.

The OAR Series is available in bulk packaging and is RoHS compliant and lead free. For non-standard technical

requirements and special applications,please contact us with your specific needs.

OAR Open Air Current Sense Resistors

Token’s “tight pitch” version of its open air metal element

current sense resistor (OAR) need less PCB space.

Open Air

Current Sense Resistor

Features

- High stability open-air style.

- Precision alloys resistive element.

- Lead (Pb)-free and RoHS compliant.

- Standard tolerance ±1%, ±2%, ±5%.

- Low inductance. Solderable copper leads (60/40).

- Radial leads, low resistance value 0.05Ω ~ 0.005Ω.

Applications

- CPU Drive Control.

- Power Tool Motor controls.

- Automotive, Feedback System.

- Inverter and Switching Power Supplies.

- Power Supply Shunt, Current Detective.

- Residual Battery Power Detection,

and Current Sensing.

http://www.token.com.tw/

rfq token.com.tw

TOKEN

Version 2010