DK106 from Shenzhen DongKe Semicon, in a SOP-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	Ground / IC reference return. Both Gnd pins (1 and 2) tie to the same internal die substrate and to the emitter of the internal HV bipolar switch; connect together to the primary-side return.
2	Gnd	power_in	Ground / IC reference return. Duplicate of pin 1 (both are the primary-side ground of the controller). Also carries the internal HV BJT emitter/current-sense return through the 40 Ω sense resistor.
3	Fb	input	Feedback control input. Drives the internal 25 µA pull-down current source and sets PWM duty / frequency. Typical operating range 1.5-3.6 V: <1.5 V arms a 48 ms opto-fail restart timer, 1.5-2.8 V runs at full 65 kHz PWM, 2.8-3.6 V linearly reduces the switching frequency (burst-mode), >3.6 V stops the oscillator. Bypass to GND with 10-100 nF.
4	Vcc	power_in	Chip supply pin. Internally regulated to ~5 V by the self-supply circuit; operating range 4-6 V (start-up threshold 4.8-5.2 V, UVLO 3.6-4.2 V, OVP shuts down above 6 V). Supply current typ. 20 mA (max 30 mA). Absolute maximum 9 V, 60 mA. Requires an external decoupling / hold-up capacitor (typ. 22 µF) to GND.
5	Collector	output	High-voltage switch collector. Pins 5, 6, 7 and 8 are internally shorted and connect to the collector of the on-chip HV bipolar switching transistor (Q1, VCEO ≥ 700 V, typ. peak current 360 mA, OCP 400 mA). Tied to the primary winding of the flyback transformer; also the entry point for the HV constant-current start-up circuit. Multiple pins are paralleled to spread current and heat - enlarge PCB copper area on these pins for thermal dissipation.
6	Collector	output	High-voltage switch collector (paralleled with pins 5, 7, 8). See pin 5 description.
7	Collector	output	High-voltage switch collector (paralleled with pins 5, 6, 8). See pin 5 description.
8	Collector	output	High-voltage switch collector (paralleled with pins 5, 6, 7). See pin 5 description.

Key specifications

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

CAD (KiCad official)

Symbol: DK106
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`dk106.step`	122 KB	You want the bare part, or you mark your own boards.
`dk106-etched.step`	1.3 MB	You want the part with `DK106` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 324 faces against 147 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 (14 pp, sha256 e4f10f6b74cff0df, 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