TNY279PN from POWER INTEGRATIONS, 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	EN/UV	input	Enable/Under-Voltage input. Dual-function pin: enable input (low-impedance source follower at 1.2 V, threshold current 75-115 uA) controls MOSFET switching via optocoupler feedback, and senses line under-voltage via an external resistor to the HV DC rail.
2	BP/M	power_in	Bypass/Multi-Function pin. Connection for external bypass capacitor for the internally generated 5.85 V supply; capacitor value (0.1/1/10 uF) also selects the current limit mode. Also provides a shutdown function when current into the pin exceeds I_SD, latching the device off until BP/M drops below 4.9 V.
4	D	power_in	Drain pin of the internal 700 V power MOSFET. Connects to the primary side of the transformer and provides internal operating current for startup and steady-state operation via the internal high-voltage current source.
5	S	power_in	Source pin. Internally connected to the output MOSFET source; serves as high-voltage power return and control-circuit common. Pins 5-8 are all Source and are tied together (multiple pins used for heatsinking to the PCB).
6	S	power_in	Source pin. Internally connected to the output MOSFET source; used together with pins 5, 7, 8 for PCB heatsinking and current return.
7	S	power_in	Source pin. Internally connected to the output MOSFET source; used together with pins 5, 6, 8 for PCB heatsinking and current return.
8	S	power_in	Source pin. Internally connected to the output MOSFET source; used together with pins 5, 6, 7 for PCB heatsinking and current return.

Key specifications

Parameter	Value
Manufacturer	POWER INTEGRATIONS
Package	DIP-8
Category	PMIC
Pins	7

Ordering variants

Same part, different packaging or reel option.

TNY279PN
TNY279PNP
TNY279PNGN
TNY279PNG

CAD (KiCad official)

Symbol: TNY279PN
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
`tny279pn.step`	271 KB	You want the bare part, or you mark your own boards.
`tny279pn-etched.step`	1.4 MB	You want the part with `TNY279PN` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 367 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: POWER INTEGRATIONS datasheet (24 pp, sha256 69793a75d6a0c8ba, 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