RPI-352 from ROHM Semicon, in a DIP-4. 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	Cathode	passive	Infrared LED emitter cathode. Forward current IF up to 50 mA, VF typ 1.3 V (max 1.6 V) at IF = 50 mA. Reverse voltage VR max 5 V.
2	Anode	passive	Infrared LED emitter anode. Drive through a current-limiting resistor from VCC; LED power dissipation PD max 80 mW.
3	Collector	passive	NPN phototransistor collector. VCEO max 30 V, IC max 30 mA, collector power dissipation PC max 80 mW. Typical IC = 1.0 mA at VCE = 5 V, IF = 20 mA (unblocked slot).
4	Emitter	passive	NPN phototransistor emitter. Emitter-collector reverse voltage VECO max 4.5 V. Usually tied to GND via load resistor or directly.

Key specifications

Parameter	Value
Manufacturer	ROHM Semicon
Package	DIP-4
Category	Sensor
Pins	4

CAD (KiCad official)

Symbol: RPI-352
Footprint: Package_DIP:DIP-4_W7.62mm
3D model: DIP-4 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`rpi-352.step`	158 KB	You want the bare part, or you mark your own boards.
`rpi-352-etched.step`	1.4 MB	You want the part with `RPI-352` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 346 faces against 80 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: ROHM Semicon datasheet (6 pp, sha256 d22cb83513719e90, retrieved 2026-08-17, tier: manufacturer)
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