# ACS70331EOLCTR-2P5U3

**ALLEGRO** · Current Sensors · SOIC-8

ACS70331EOLCTR-2P5U3 from ALLEGRO, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | IP+ | passive | Terminals for current being sensed; fused internally. |
| 2 | IP+ | passive | Terminals for current being sensed; fused internally. |
| 3 | IP- | passive | Terminals for current being sensed; fused internally. |
| 4 | IP- | passive | Terminals for current being sensed; fused internally. |
| 5 | GND | power_in | Device ground terminal. |
| 6 | NC | unconnected | This pin should be left unconnected during normal operation. |
| 7 | VIOUT | output | Analog output representing the current flowing through IP. |
| 8 | VCC | power_in | Device power supply terminal. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ALLEGRO |
| Package | SOIC-8 |
| Category | Sensors |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply Voltage | VCC | 3 | 3.3 | 4.5 | V |  | 6 |
| Supply Current | ICC |  | 4.5 | 6 | mA | VCC(min) ≤ VCC ≤ VCC(max), no load on VIOUT, fuses powered down | 6 |
| Supply Current at Start-Up | ICC_START_UP |  |  | 7.5 | mA | VCC(min) ≤ VCC ≤ VCC(max), no load on VIOUT, fuses powered (from time when VCC rises above VCC(min) to tFPD) | 6 |
| Output Resistive Load | RL | 22 |  |  | kΩ | VIOUT to GND or VIOUT to VCC | 6 |
| Output Capacitive Load (stable, slew rate and bandwidth reduced) | CL |  |  | 100 | pF | VIOUT to GND, output is stable, slew rate and bandwidth are reduced | 6 |
| Output Capacitive Load (maintains BW) | CL |  |  | 50 | pF | VIOUT to GND, maintains BW | 6 |
| Saturation Voltage High | VSAT_HIGH | 2.8 |  |  | V | VCC(min) < VCC < VCC(max); RL = 22 kΩ to GND | 6 |
| Saturation Voltage Low | VSAT_LOW |  | 20 | 200 | mV | VCC(min) < VCC < VCC(max); RL = 22 kΩ to VIOUT | 6 |
| Hysteresis after ±10 A pulse | IH |  | 10 | 20 | mA | TA = 25°C; change in the output at zero current after a ±10 A pulse of current through the sensor | 6 |
| Total Output Error at IPR(max), 25°C | ETOT | -0.8 | 0.8 | 0.8 | % | Measured at IP = IPR(max), TA = 25°C | 10 |
| Total Output Error at IPR(max), 25°C to 85°C | ETOT | -3 | 3 | 3 | % | Measured at IP = IPR(max), TA = 25°C to 85°C | 10 |
| Total Output Error at IPR(max), -40°C to 25°C | ETOT | -5 | 5 | 5 | % | Measured at IP = IPR(max), TA = -40°C to 25°C | 10 |
| Sensitivity Error at IPR(max), 25°C | Esens | -0.5 | 0.5 | 0.5 | % | Measured at IP = IPR(max), TA = 25°C | 10 |
| Sensitivity Error at IPR(max), 25°C to 85°C | Esens | -2.5 | 2.5 | 2.5 | % | Measured at IP = IPR(max), TA = 25°C to 85°C | 10 |
| Sensitivity Error at IPR(max), -40°C to 25°C | Esens | -2 | 2 | 2 | % | Measured at IP = IPR(max), TA = -40°C to 25°C | 10 |
| Offset Voltage at IP = 0 A, 25°C | VOE | -11 | 11 | 11 | mV | IP = 0 A, TA = 25°C | 10 |
| Offset Voltage at IP = 0 A, 25°C to 85°C | VOE | -17 | 17 | 17 | mV | IP = 0 A, TA = 25°C to 85°C | 10 |
| Offset Voltage at IP = 0 A, -40°C to 25°C | VOE | -34 | 34 | 34 | mV | IP = 0 A, TA = -40°C to 25°C | 10 |
| Sensitivity | Sens |  | 800 |  | mV/A | IPR(min) < IP < IPR(max) | 10 |
| Zero Current Output Voltage | VIOUT(Q) |  | 0.25 |  | V | IP = 0 mA, TA = 25°C | 10 |
| Current Sensing Range | IPR | 0 |  | 2.5 | A |  | 10 |
| Supply Voltage | VCC |  |  | 7 | V |  | 3 |
| Reverse Supply Voltage | VRCC | -0.1 |  |  | V |  | 3 |
| Output Voltage | VIOUT |  |  | 6 | V |  | 3 |
| Reverse Output Voltage | VRIOUT | -0.1 |  |  | V |  | 3 |
| Working Voltage | VWORKING |  |  | 100 | V | Voltage applied between pins 1 to 4 and pins 5 to 8 (SOIC) | 3 |
| Maximum Continuous Current | IP(max) | -10 |  | 10 | A |  | 3 |
| Maximum Continuous External Field | B | -50 |  | 50 | G |  | 3 |
| Nominal Operating Ambient Temperature | TA | -40 |  | 85 | °C | Range E | 3 |
| Maximum Junction Temperature | TJ(max) |  |  | 100 | °C |  | 3 |
| Storage Temperature | Tstg | -65 |  | 125 | °C |  | 3 |

## CAD (KiCad official)

- Symbol: `ACS70331EOLCTR-2P5U3`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `acs70331eolctr-2p5u3-etched.step` / `acs70331eolctr-2p5u3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `acs70331eolctr-2p5u3.step` / `acs70331eolctr-2p5u3.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [ALLEGRO datasheet](https://www.mouser.com/datasheet/2/1115/ACS70331_Datasheet-3178881.pdf) (27 pp, sha256 `b6acd30f73a9827b`, retrieved 2026-11-02, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/acs70331eolctr-2p5u3-datasheet.pdf)