# ACHS-7121-000E

**AVAGO(Broadcom)** · Current Sensors · SO-8

ACHS-7121-000E from AVAGO(Broadcom), in a SO-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 | Current-sampling input terminal (fused internally with pin 2); short pins 1 and 2 together, current flows from pins 1 and 2 to pins 3 and 4 with 0.7 mΩ typ. conductor resistance. |
| 2 | IP+ | passive | Current-sampling input terminal (fused internally with pin 1); short pins 1 and 2 together, isolated from signal pins 5-8 (3 kVRMS, 1 min). |
| 3 | IP- | passive | Current-sampling output terminal (fused internally with pin 4); short pins 3 and 4 together, output voltage slope is positive for current flowing from pins 1,2 to pins 3,4. |
| 4 | IP- | passive | Current-sampling output terminal (fused internally with pin 3); short pins 3 and 4 together, isolated from signal pins 5-8 (3 kVRMS, 1 min). |
| 5 | GND | power_in | Output-side ground; connect a 1 µF bypass capacitor between pins 8 and 5 and the FILTER capacitor CF to this pin. |
| 6 | FILTER | passive | Filter pin that sets bandwidth via a capacitor CF to GND (80 kHz typ. bandwidth with 1 nF). |
| 7 | VOUT | output | Analog output voltage proportional to sensed current, VDD/2 at zero current, with load of at least 4.7 kΩ and at most 10 nF. |
| 8 | VDD | power_in | Supply voltage relative to GND, 4.5 V to 5.5 V recommended (5.0 V nominal), absolute maximum 8.0 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | AVAGO(Broadcom) |
| Package | SO-8 |
| Category | Sensors |
| Pins | 8 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing | Abs |  | Insulation and Safety Related Specifications Absolute Maximum Rating | 5 |
| contacts | copper |  | through the primary copper conduction path (from pins 1 and 2, | 1 |

## CAD (KiCad official)

- Symbol: `ACHS-7121-000E`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files: `achs-7121-000e-etched.step` / `achs-7121-000e-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `achs-7121-000e.step` / `achs-7121-000e.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [AVAGO(Broadcom) datasheet](docs/achs-7121-000e-datasheet.pdf) (15 pp, sha256 `46570c97df222e56`, retrieved 2026-10-23, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/achs-7121-000e-datasheet.pdf)