component

RPI-221A

Public Made by Adom

by adom

ROHM Semicon Photointerrupters - Slot Type - Transistor Output, DIP-4. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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RPI-221A

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

RPI-221A 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 (infrared emitter) cathode; max forward current 50 mA, reverse voltage 5 V, VF 1.3 V typ at IF=50 mA.
2 Anode passive LED (infrared emitter) anode; max forward current 50 mA, power dissipation 80 mW.
3 Collector passive Phototransistor collector; VCEO max 30 V, collector current max 30 mA, collector 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 Optoelectronics
Pins 4

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Forward current IF 50 mA 1
Reverse voltage VR 5 V 1
Power dissipation PD 80 mW 1
Collector-emitter voltage VCEO 30 V 1
Emitter-collector voltage VECO 4.5 V 1
Collector current IC 30 mA 1
Collector power dissipation PC 80 mW 1
Operating temperature Topr -25 85 °C 1
Storage temperature Tstg -30 85 °C 1
Collector-emitter saturation voltage VCE(sat) 0.4 V IF =20mA, IC=0.1mA 2
Peak light emitting wavelength λp 950 nm 2
Maximum sensitivity wavelength λp 800 nm 2

CAD (KiCad official)

  • Symbol: RPI-221A
  • Footprint: Package_DIP:DIP-4_W7.62mm
  • 3D model: DIP-4 (KiCad packages3D, STEP)
  • 3D model files: rpi-221a-etched.step / rpi-221a-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); rpi-221a.step / rpi-221a.glb are the bare package body.

Provenance

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

  • Datasheet: ROHM Semicon datasheet (6 pp, sha256 d87b2e7329011e0d, retrieved 2026-10-15, tier: lcsc)
  • 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