# HCPL-0661-500E

**Broadcom AVAGO** · Logic Output Optoisolators · SO-8

HCPL-0661-500E from Broadcom AVAGO, 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 | ANODE 1 | passive | Anode of LED 1 (channel 1 input); the datasheet recommends about 5 mA input on-current. |
| 2 | CATHODE 1 | passive | Cathode of LED 1 (channel 1 input). |
| 3 | CATHODE 2 | passive | Cathode of LED 2 (channel 2 input). |
| 4 | ANODE 2 | passive | Anode of LED 2 (channel 2 input). |
| 5 | GND | power_in | Ground for the output side; a 0.1 µF bypass capacitor must be connected as close as possible between pins 5 and 8. |
| 6 | VO2 | output | Channel 2 open-collector Schottky-clamped output, low when LED 2 is on. |
| 7 | VO1 | output | Channel 1 open-collector Schottky-clamped output, low when LED 1 is on. |
| 8 | VCC | power_in | Supply voltage for the output detector; a 0.1 µF bypass capacitor must be connected as close as possible between pins 5 and 8. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Broadcom AVAGO |
| Package | SO-8 |
| Category | Optoisolators |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `HCPL-0661-500E`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files: `hcpl-0661-500e-etched.step` / `hcpl-0661-500e-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `hcpl-0661-500e.step` / `hcpl-0661-500e.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/8588914087782309888) (30 pp, sha256 `5fe8353672e43760`, retrieved 2026-10-10, 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/hcpl-0661-500e-datasheet.pdf)