HCPL-3120-C1LO from KTP, 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	NC	unconnected	No internal connection. Leave floating or tie to a convenient node for creepage.
2	ANODE	input	Anode of the input GaAsP LED. Drive with IF(ON) = 7-16 mA to turn on the output; peak IFM = 25 mA. Typical forward voltage VF = 1.5 V.
3	CATHODE	input	Cathode of the input LED. Return path for the LED forward current; reverse input voltage VR limited to 5 V.
4	NC	unconnected	No internal connection. Provides input-to-output creepage on the input side of the DIP-8 package.
5	VSS	power_in	Negative (return) rail of the isolated output-side gate-drive supply. VDD-VSS operating range is 15 to 30 V (absolute max 0 to 30 V). Place the 0.1 uF bypass capacitor between pins 5 and 8 close to the package.
6	VO2	output	Gate-drive output 2, internally tied to VO1 (pin 7). Both output pins are bonded together to share the 2.5 A peak sink/source current into the IGBT/MOSFET gate; connect pins 6 and 7 together at the PCB.
7	VO1	output	Gate-drive output 1. Push-pull P-MOSFET/N-MOSFET output stage delivering IO(PEAK) up to 2.5 A (abs max 3.0 A) to drive an IGBT or power-MOSFET gate; VOH swings to within ~0.25 V of VDD at light load.
8	VDD	power_in	Positive rail of the isolated output-side gate-drive supply, 15-30 V typical (abs max 30 V). A 0.1 uF bypass capacitor between pins 5 and 8 close to the package is required.

Key specifications

Parameter	Value
Manufacturer	KTP
Package	DIP-8
Category	Optoisolators
Pins	8

Ordering variants

Same part, different packaging or reel option.

HCPL-3120-C1LO
HCPL-3120S

CAD (KiCad official)

Symbol: HCPL-3120-C1LO
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: KTP datasheet (12 pp, sha256 fa13a350d814a28c, 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