Pinout
ACS712 current sensor module pinout
Pins
- GND
- OUT (analog — VCC/2 at 0A, ±185/100/66 mV per A for the 5A/20A/30A variants)
- VCC (5V — the output scale and the VCC/2 zero point follow the supply, so power it from the same 5V the ADC reference uses)
- IP+ / IP− (screw terminal — the measured current path, isolated from the logic side; neither screw is marked on the board, so wire it, read OUT, and swap the two if the sign comes out backwards)
Specifications
| Supply voltage | 4.5–5.5 V (5 V typical) |
|---|---|
| Measuring range | ±5 A / ±20 A / ±30 A (by variant) |
| Sensitivity | 185 / 100 / 66 mV/A (5 A / 20 A / 30 A) |
| Zero-current output | VCC / 2 (2.5 V at 5 V), ratiometric |
| Total output error | ±1.5 % at 25 °C |
| Bandwidth | 80 kHz |
| Rise time | 5 µs |
| Conductor resistance | 1.2 mΩ |
| Isolation | 2.1 kV RMS |
| Supply current | 10 mA typical |
Notes
- Bidirectional: below VCC/2 means current flowing from IP− to IP+. The D1 LED only shows that VCC is present.
- The terminal and its traces are the only parts rated for the full current — keep the measured circuit away from the 3-pin logic side.
