ACS712

@@ -0,0 +1,53 @@+# ACS712++**Allegro MicroSystems** · Hall-effect current sensor · SOIC-8++A fully integrated Hall-effect linear current sensor in a SOIC-8: current flows through an internal 1.2 milliohm copper path (pins IP+ to IP-) and the on-chip Hall sensor reports it as an analog voltage on VIOUT, with the sensing electronics galvanically isolated from the current path (up to 2.1 kV). The output sits at half-supply (2.5 V at 0 A) and swings proportionally, so it reads bidirectional AC or DC current. Factory-trimmed variants cover plus/minus 5 A (185 mV/A), plus/minus 20 A (100 mV/A), and plus/minus 30 A (66 mV/A). Runs from a single 5 V supply.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | IP+ | passive | Primary current input terminal (positive). Terminals for current being sampled; fused internally. Pins 1 and 2 are tied together to carry the sensed current into the on-die copper conduction path. |+| 2 | IP+ | passive | Primary current input terminal (positive). Terminals for current being sampled; fused internally. Pins 1 and 2 are tied together to carry the sensed current into the on-die copper conduction path. |+| 3 | IP- | passive | Primary current output terminal (negative/return). Terminals for current being sampled; fused internally. Pins 3 and 4 are tied together to carry the sensed current out of the on-die copper conduction path. |+| 4 | IP- | passive | Primary current output terminal (negative/return). Terminals for current being sampled; fused internally. Pins 3 and 4 are tied together to carry the sensed current out of the on-die copper conduction path. |+| 5 | GND | power_in | Signal ground terminal. Reference ground for VCC and VIOUT on the signal side of the isolation barrier. |+| 6 | FILTER | passive | Terminal for external capacitor (CF) that sets output bandwidth. Forms an RC filter with the internal RF(INT) ≈ 1.7 kΩ. Typical value is 1 nF for the default 80 kHz bandwidth. |+| 7 | VIOUT | output | Analog output signal. Voltage proportional to the sensed primary current IP, with a quiescent (zero-current) output of VCC × 0.5 (bidirectional variants). Sensitivity ranges from 66 to 185 mV/A depending on the current-range variant. |+| 8 | VCC | power_in | Device power supply terminal. 5.0 V nominal (4.5 V min / 5.5 V max). Typical supply current ICC ≈ 10 mA. Decouple with 0.1 µF to GND close to the pin. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Hall-effect linear current sensor |+| Sensing | galvanically isolated (2.1 kV) |+| Conductor resistance | 1.2 mΩ |+| Output | analog, 2.5 V at 0 A (ratiometric) |+| Ranges | ±5 A / ±20 A / ±30 A |+| Sensitivity | 185 / 100 / 66 mV/A |+| Supply voltage | 5 V |+| Package | SOIC-8 |++## Ordering variants++- `ACS712ELCTR-05B-T (±5 A)`+- `ACS712ELCTR-20A-T (±20 A)`+- `ACS712ELCTR-30A-T (±30 A)`++## CAD (KiCad official)++- Symbol: `Sensor_Current:ACS712xLCTR-20A`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Allegro MicroSystems datasheet](https://www.allegromicro.com/-/media/files/datasheets/acs712-datasheet.ashx) (16 pp, sha256 `21b345f7a98d3694`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/acs712-datasheet.pdf)

@@ -0,0 +1,36 @@+{+  "slug": "acs712",+  "version": "0.1.0",+  "type": "component",+  "description": "Allegro Hall-effect linear current sensor, SOIC-8. Fully isolated 1.2 mohm path, analog output, ±5/20/30 A. Datasheet-verified.",+  "tags": [+    "component",+    "sensor",+    "current-sensor",+    "hall-effect",+    "isolated",+    "soic-8",+    "allegro"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "acs712.kicad_sym",+    "acs712.kicad_mod",+    "acs712.glb",+    "docs/hero.png",+    "docs/acs712-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file