# RPI-243C1

**ROHM Semicon** · Photointerrupters - Slot Type - Transistor Output · DIP-4

RPI-243C1 from ROHM Semicon, 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 | Cathode | passive | LED cathode; LED forward current max 50 mA, reverse voltage max 5 V. |
| 2 | Anode | passive | LED anode; LED forward current max 50 mA (typ. VF 1.3 V at IF=50 mA), power dissipation 80 mW. |
| 3 | Collector | passive | Phototransistor collector; VCEO max 30 V, collector current max 30 mA, power dissipation 80 mW. |
| 4 | Emitter | passive | Phototransistor emitter; emitter-collector voltage max 4.5 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ROHM Semicon |
| Package | DIP-4 |
| Category | Sensors |
| Pins | 4 |

## CAD (KiCad official)

- Symbol: `RPI-243C1`
- Footprint: `Package_DIP:DIP-4_W7.62mm`
- 3D model: DIP-4 (KiCad packages3D, STEP)
- 3D model files: `rpi-243c1-etched.step` / `rpi-243c1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rpi-243c1.step` / `rpi-243c1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ROHM Semicon datasheet](docs/rpi-243c1-datasheet.pdf) (3 pp, sha256 `fff939198227c79d`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (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/rpi-243c1-datasheet.pdf)