# CYTLP521-1

**OCIC** · Transistor, Photovoltaic Output Optoisolators · DIP-4

CYTLP521-1 from OCIC, in a DIP-4. 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 | passive | LED anode of the input side; forward current IF max 50 mA, forward voltage 1.0-1.3 V at IF=10 mA. |
| 2 | Cathode | passive | LED cathode of the input side; reverse voltage VR max 6 V. |
| 3 | Emitter | passive | Phototransistor emitter of the output side; emitter-collector voltage VECO max 7 V. |
| 4 | Collector | passive | Phototransistor collector of the output side; VCEO max 80 V and collector current IC max 50 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | OCIC |
| Package | DIP-4 |
| Category | Optoisolators |
| Pins | 4 |

## CAD (KiCad official)

- Symbol: `CYTLP521-1`
- Footprint: `Package_DIP:DIP-4_W7.62mm`
- 3D model: DIP-4 (KiCad packages3D, STEP)
- 3D model files: `cytlp521-1-etched.step` / `cytlp521-1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cytlp521-1.step` / `cytlp521-1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [OCIC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588893146142531584) (9 pp, sha256 `bf999cacdbf98f51`, retrieved 2026-10-09, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/cytlp521-1-datasheet.pdf)