DK5V45R25P 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	A	passive	Anode-equivalent terminal of the synchronous rectifier (source of the internal 45V NMOS). Acts as the diode anode in the application; all A pins (1,2,3) are internally tied and typically connected to transformer secondary return. Reference point for all datasheet voltage specs.
2	A	passive	Anode-equivalent terminal of the synchronous rectifier. Internally tied to pins 1 and 3.
3	A	passive	Anode-equivalent terminal of the synchronous rectifier. Internally tied to pins 1 and 2.
4	VCC	power_in	Chip supply pin. Startup threshold VCC_ON = 3.6V, UVLO VCC_OFF = 3.1V, normal operating range 5-6V. In 5V low-side applications VCC ties directly to the output positive rail - no external components required.
5	K	passive	Cathode-equivalent terminal of the synchronous rectifier (drain of the internal 45V NMOS). Acts as the diode cathode in the application; all K pins (5,6,7,8) are internally tied and typically connected to the output positive rail.
6	K	passive	Cathode-equivalent terminal of the synchronous rectifier. Internally tied to pins 5, 7, 8.
7	K	passive	Cathode-equivalent terminal of the synchronous rectifier. Internally tied to pins 5, 6, 8.
8	K	passive	Cathode-equivalent terminal of the synchronous rectifier. Internally tied to pins 5, 6, 7.

Key specifications

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

CAD (KiCad official)

Symbol: DK5V45R25P
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
`dk5v45r25p.step`	122 KB	You want the bare part, or you mark your own boards.
`dk5v45r25p-etched.step`	2.0 MB	You want the part with `DK5V45R25P` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 511 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 (6 pp, sha256 d96183bd9086ab0e, 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