DK124 from Shenzhen DongKe Semicon, 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	GND	power_in	Chip ground reference. Tied together with pin 2 to form the IC ground return.
2	GND	power_in	Chip ground reference. Tied together with pin 1 to form the IC ground return.
3	FB	input	Feedback control input. Sinks the optocoupler current (internal 40uA pull-up) to set the cycle-by-cycle peak current limit. FB=1.5V-2.5V linearly scales peak current; <1.33V triggers short-circuit/overload, >2.5V drops PWM to 22kHz, >2.8V enters burst standby.
4	VCC	power_in	Chip supply pin. Regulated by the internal patented self-supply circuit to ~5V (start 5.05V typ, restart 3.6V typ, OVP 6.55V typ). External VCC storage capacitor is charged from OC via the internal high-voltage current source. Absolute max 8V.
5	OC	output	Drain of the internal 700V power MOSFET. Pins 5,6,7,8 are internally tied together for current-handling and thermal dissipation and connect to the transformer primary. Peak switch current limited to 1.3A typ; OC OVP trips at 600V typ.
6	OC	output	Drain of the internal 700V power MOSFET (paralleled with pins 5,7,8).
7	OC	output	Drain of the internal 700V power MOSFET (paralleled with pins 5,6,8).
8	OC	output	Drain of the internal 700V power MOSFET (paralleled with pins 5,6,7).

Key specifications

Parameter	Value
Manufacturer	Shenzhen DongKe Semicon
Package	DIP-8
Category	PMIC
Pins	8

CAD (KiCad official)

Symbol: DK124
Footprint: Package_DIP:DIP-8_W7.62mm
3D model: DIP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`dk124.step`	271 KB	You want the bare part, or you mark your own boards.
`dk124-etched.step`	1.1 MB	You want the part with `DK124` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 290 faces against 148 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: Shenzhen DongKe Semicon datasheet (7 pp, sha256 685d94645ea5e49a, 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