The TLR3AP series of metal plate current sense resistors from KOA are suitable for measuring currents up to 100A. Available in industry standard 2512 SMD case size the TLR3AP series is offered in resistance range from 0.5mΩ to 10mΩ with 1% tolerance, power rating between 5W and 3W depending on the resistance value and option of ±50ppm or ±75ppm T.C.R.
These TLR3AP shunts are trimmed by milling the top of the resistor rather than the traditional method of trimming where a parallel cut is made in the resistance element to adjust for the desired resistance during the manufacturing process. By milling instead of trimming the resistance means that there are no hotspots on the device as the power is dissipated evenly through the resistor element, resulting in an even temperature distribution which increases reliability. The lack of hot spot also results in a high pulse power capability up to 3kW for 1mS.
Trimming vs. Milling
In the image above the trimmed resistor has a hot spot around the trimming cut, conversely the TLR3AP series has a much more even spread of heat across the whole resistor element giving better heat distribution for resistance stability. Another key advantage of milling vs. trimming is a much lower inductance, typical inductance is in the region of 1.5nH for the TLR3AP series depending on resistance value chosen.
The TLR3AP series metal plate current sense resistors are AEC-Q200 tested and feature an operating temperature range from -65 °C to +170 °C.
The KOA TLR3AP series metal plate current sense resistors are suitable for use in Automotive electronics, Motor control units, Power supplies, AC / DC-DC converter, Metering, CPU current sensing and charge controllers.
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