# ACPL-C78A-500E

**Broadcom AVAGO** · Isolation Amplifiers · SO-8

ACPL-C78A-500E from Broadcom AVAGO, in a SO-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VDD1 | power_in | Supply voltage for the input (isolator primary) side, 4.5 V to 5.5 V, referenced to GND1. A 0.1 µF bypass capacitor must be connected between pins 1 and 4. |
| 2 | VIN+ | input | Positive analog input to the sigma-delta modulator. Recommended linear input range ±200 mV; absolute steady-state limits −2 V to VDD1 + 0.5 V. Typically driven by the high side of the current-sense shunt. |
| 3 | VIN- | input | Negative analog input to the sigma-delta modulator, normally connected to GND1 (shunt low side / input-side ground reference). |
| 4 | GND1 | power_in | Input-side ground (isolator primary). Ground return for VDD1 and the analog input signal. |
| 5 | GND2 | power_in | Output-side ground (isolator secondary). Ground return for VDD2 and the differential output. |
| 6 | VOUT- | output | Negative side of the fully differential analog output. Output range −0.5 V to VDD2 + 0.5 V (absolute max). |
| 7 | VOUT+ | output | Positive side of the fully differential analog output. Together with VOUT- forms a differential voltage proportional to the input current-sense signal. |
| 8 | VDD2 | power_in | Supply voltage for the output (isolator secondary) side, 4.5 V to 5.5 V, referenced to GND2. A 0.1 µF bypass capacitor must be connected between pins 5 and 8. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Broadcom AVAGO |
| Package | SO-8 |
| Category | Signal Isolation Devices |
| Pins | 8 |

## Ordering variants

Same part, different packaging or reel option.

- `ACPL-C78A-500E-000E`
- `ACPL-C78A-500E-060E`
- `ACPL-C78A-500E`
- `ACPL-C78A-500E-560E`

## CAD (KiCad official)

- Symbol: `ACPL-C78A-500E`
- Footprint: `Package_SO:TI_SO-PowerPAD-8`
- 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files: `acpl-c78a-500e-etched.step` / `acpl-c78a-500e-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `acpl-c78a-500e.step` / `acpl-c78a-500e.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Broadcom AVAGO datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590208168661061632) (17 pp, sha256 `45124e6469995049`, retrieved 2026-08-17, tier: lcsc)
- **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/acpl-c78a-500e-datasheet.pdf)