VIPER22ADIP-E from STMicroelectronics, 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	SOURCE	power_in	Power MOSFET source and circuit ground reference. Tied internally to pin 2; both source pins must be connected together on the PCB and used as the primary-side ground return.
2	SOURCE	power_in	Power MOSFET source and circuit ground reference (second source pin, internally common with pin 1). Provides additional current-handling capacity for the MOSFET source return path.
3	FB	input	Feedback input for the current-mode PWM controller. Useful voltage range is 0 V to 1 V; defines the peak drain MOSFET current. Current limitation (IDlim typ 0.7 A) is obtained when FB is shorted to SOURCE. Typically driven by an optocoupler; absolute-maximum IFB is 3 mA.
4	VDD	power_in	Supply for the internal control circuits. Operating range 9 V to 38 V (absolute max 50 V, overvoltage protection at ~42 V). VDDon start-up threshold typ 14.5 V, VDDoff undervoltage-shutdown threshold typ 8 V. Charged during start-up by the internal high-voltage current source from the DRAIN pin; requires an external hold-up capacitor.
5	DRAIN	power_in	Power MOSFET drain (internally common with pins 6, 7, 8). Connects to the flyback transformer primary winding; also used by the internal high-voltage current source during start-up to charge the VDD capacitor. Switching drain-source rating 730 V; start-up drain-source rating 400 V.
6	DRAIN	power_in	Power MOSFET drain (internally common with pins 5, 7, 8). Provides additional current-handling capability and heat-spreading area to the PCB copper.
7	DRAIN	power_in	Power MOSFET drain (internally common with pins 5, 6, 8). Provides additional current-handling capability and heat-spreading area to the PCB copper.
8	DRAIN	power_in	Power MOSFET drain (internally common with pins 5, 6, 7). Provides additional current-handling capability and heat-spreading area to the PCB copper.

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	DIP-8
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

VIPer22ADIP-E
VIPer22AS-E

CAD (KiCad official)

Symbol: VIPER22ADIP-E
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
`viper22adip-e.step`	271 KB	You want the bare part, or you mark your own boards.
`viper22adip-e-etched.step`	2.1 MB	You want the part with `VIPER22ADIP-E` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 535 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: STMicroelectronics datasheet (21 pp, sha256 1beb8b2779d6db94, retrieved 2026-08-17, tier: manufacturer)
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