SMD Current Sense Shunt Resistor 1 mΩ 4 W 3920 (R001)
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Prices updated: 14 Oct 2026
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About this product
Manganese-copper SMD shunt resistor with a 1 mΩ value and ±1% tolerance, designed for high-precision current sensing and low-inductance current feedback. It suits high-current pulse and surge measurements. Built in the 3920 package, which is easy to solder to PCB pads.
Specifications
- Resistance
- 1 mΩ (0.001 Ω)
- Tolerance
- ±1%
- Temperature coefficient
- ±50 ppm/°C
- Power rating
- 4 W
- Package
- 3920 SMD
- Inductance
- 10 nH
Frequently asked questions
How do I measure current with this shunt?
Measure the voltage across the shunt with a differential amplifier or ADC and apply Ohm's law, I = V / R. At 1 mΩ, 1 A produces only 1 mV, so a current-sense amplifier or high-gain stage is needed.
How should I connect it for accurate readings?
Use separate Kelvin (four-wire) sense connections from the pads to the measurement point so that lead and trace resistance do not add error. Check the power dissipation as well: at 20 A the shunt dissipates about 0.4 W (I²R).
