LOC112 from Littelfuse IXYS, in a DIP-8. 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	-LED	passive	LED cathode. Return-side terminal of the internal infrared emitter diode. LED forward voltage 0.9-1.4 V at IF = 2-10 mA (typ 1.2 V); reverse LED voltage rating 5 V; input control current 100 mA continuous / 1 A peak (10 ms).
2	+LED	passive	LED anode. Drive-side terminal of the internal infrared emitter diode used to modulate both photodiodes. Drive with 2-10 mA operating current; observe input power dissipation of 150 mW (derate 1.33 mW/°C above 25 °C).
3	C1	passive	Servo (feedback/input) photodiode cathode. Together with pin 4 (A1) forms PD1, the feedback photodiode used to close the loop around the LED and cancel its nonlinear temperature/time behavior. Servo gain K1 = IC1/IF = 0.004-0.030 (typ 0.007) at IF = 2-10 mA with VC1-A1 = 15 V.
4	A1	passive	Servo (feedback/input) photodiode anode. Return terminal of PD1. Dark current ID typ 1 nA, max 25 nA at IF = 0 mA, VC1-A1 = 15 V. Input/output capacitance CIO typ 3 pF.
5	A2	passive	Output photodiode anode. Return terminal of PD2, the output-side photodiode whose photocurrent is linear with respect to the servoed LED current. Output side is isolated from the input by 3750 Vrms.
6	C2	passive	Output photodiode cathode. Together with pin 5 (A2) forms PD2, the output photodiode. Forward gain K2 = IC2/IF = 0.004-0.030 (typ 0.007); transfer gain K3 = K2/K1 = 0.733-1.072 (K3-binned into D/E/F/G); K3 linearity ≤1%, temp coefficient ~0.005 %/°C.
7	NC	unconnected	No internal connection. Leave floating or tie to a convenient node for mechanical/routing purposes; do not use as a tie point for high-voltage nets since it is on the output side of the isolation barrier.
8	NC	unconnected	No internal connection. Leave floating; not used by the optocoupler.

Key specifications

Parameter	Value
Manufacturer	Littelfuse IXYS
Package	DIP-8
Category	Optoisolators
Pins	8

Ordering variants

Same part, different packaging or reel option.

LOC112
LOC112P
LOC112PTR
LOC112S
LOC112STR

CAD (KiCad official)

Symbol: LOC112
Footprint: Package_DIP:DIP-8_W7.62mm
3D model: DIP-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Littelfuse IXYS datasheet (None pp, sha256 9e9db6ad97363102, retrieved 2026-08-17, tier: lcsc)
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