Resistors

WSR35L000FEA - 5 mOhm 3W Current Sense Resistor 4527 | Vishay

The Vishay Dale WSR35L000FEA is a 5 mOhm (0.005 Ohm) surface-mount Power Metal Strip current-sense resistor rated at 3 W continuous power, packaged in a 4527 (11.56 mm x 7.49 mm) molded J-Lead SMD format with anti-sulfur construction, AEC-Q200 automotive qualification, ±1% resistance tolerance, and ±110 ppm/°C temperature coefficient. A current-sense resistor is a low-value, precision resistor placed in series with a current path so that the voltage drop across it (V = I × R) can be measured by an amplifier or ADC to infer the load current. This category is part of the passive components family, sitting alongside standard resistors in the surface-mount taxonomy: chip resistor -> current-sense resistor -> metal-strip current-sense resistor -> power current-sense resistor. Power Metal Strip technology uses a proprietary welded metal-alloy resistance element that achieves very low resistance values (down to 0.001 ohm) with excellent pulse-withstanding capability, making it ideal for high-current monitoring. Key specifications include 0.005 ohm resistance (5 milliohnse), ±1% tolerance for accurate current measurement, 3 W power rating at 70 °C derated to zero at 275 °C, ±110 ppm/°C TCR for stable readings across operating temperature, and a 4-terminal (Kelvin) J-Lead layout that minimizes the influence of lead resistance on measurement accuracy. Anti-sulfur construction protects the metal element from sulfur-induced corrosion, critical in industrial and automotive environments where sulfur contamination is common. The WSR35L000FEA uses an all-welded construction of a precision-rolled metal alloy strip molded in a high-temperature thermoset compound, providing pulse-withstanding performance equivalent to wirewound resistors while maintaining the low-inductance characteristics required for switching-converter current waveforms. The 4-terminal J-Lead footprint (two pads for current flow, two pads for voltage sensing) allows true Kelvin connection on the PCB, eliminating parasitic voltage drops in the high-current path from contaminating the sense voltage. Typical applications include DC-DC converter current feedback in switch-mode power supplies, battery management system (BMS) current monitoring, motor control phase-current sensing in BLDC drivers, automotive ECU power monitoring, and load monitoring in power distribution systems. The AEC-Q200 qualification allows deployment under the hood, in chassis modules, and in other automotive stress environments. When designing with this part, route the sense traces as a true 4-wire Kelvin connection back to the amplifier, keep the current-carrying traces wide enough to carry full load without significant IR rise, and verify the PCB land pattern against the J-Lead footprint shown in the Vishay WSR series datasheet. This page synthesizes distributor pricing from DigiKey and Mouser, AEC-Q200 qualification status, design notes, and drop-in alternative candidates not found in the manufacturer catalog alone.