AT212-CuH-D from AOTE, 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	AN	passive	Input-side infrared LED anode. Drive with forward current (typ. 5 mA, max IF = 50 mA continuous; VF ≈ 1.3 V typ, 1.4 V max at IF = 5 mA) through a current-limiting resistor to turn the output MOSFET on.
2	CA	passive	Input-side infrared LED cathode. Return path for the LED drive current; typically tied to the control-side ground or driver's low-side. Reverse voltage rating VR = 6 V.
3	D1	passive	Output-side photoMOSFET terminal 1. Bidirectional AC/DC switch pole (normally open); paired with D2 forms a 60 V peak, 500 mA continuous (1.5 A peak) load switch with RON typ 0.8 Ω, max 1.5 Ω. Off-state leakage ≤ 1 µA at VL = 60 V.
4	D2	passive	Output-side photoMOSFET terminal 2. Bidirectional AC/DC switch pole (normally open); paired with D1. Ton typ 0.4 ms, Toff typ 0.25 ms at IF = 5 mA, IL = 0.5 A.

Key specifications

Parameter	Value
Manufacturer	AOTE
Package	DIP-4
Category	Optoisolators
Pins	4

Ordering variants

Same part, different packaging or reel option.

AT212-CuH-D
AT212-CuH-S
AT212-CuH-M
AT212-CuH-L
AT212-CuH-D222-CuH-D

CAD (KiCad official)

Symbol: AT212-CuH-D
Footprint: Package_DIP:DIP-4_W7.62mm
3D model: DIP-4 (KiCad packages3D, STEP)

Provenance

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

Datasheet: AOTE datasheet (14 pp, sha256 d83e187eed71d9a5, retrieved 2026-08-17, 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: 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