PT4119EE89E from PowTech CR PowTech Shanghai, in a SOT-89-5. 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	SW	output	Switch output. SW is the drain of the internal N-channel MOSFET power switch (R_DS(on) ~0.6Ω typ). Connects to the external inductor / freewheeling Schottky diode node in the buck topology; rated up to 1A continuous switch current and 55V absolute max.
2	GND	power_in	Signal and power ground. Connect directly to the ground plane for both signal reference and current return of the internal MOSFET.
3	DIM	input	Logic-level dimming / enable input. Drive DIM low (<0.3V) to turn off the current regulator (shutdown), drive high (≥2.5V) to enable full LED current. Accepts PWM dimming from 100Hz up to 20kHz, or a DC voltage (0.5V-2.5V) for analog brightness control. Internally pulled up (~200kΩ) to a 4.2V internal supply.
4	CSN	input	Current sense input (high-side). Connect to the low side of the external sense resistor R_CS between VIN and CSN. Nominal mean sense threshold V_IN - V_CSN = 200mV (194-206mV); sets LED current as I_OUT = 0.2/R_CS. Input current ~8µA at 50mV differential.
5	VIN	power_in	Input supply pin, 6V to 50V operating (55V abs max). Must be locally bypassed with a low-ESR capacitor (≥10µF X7R/X5R recommended) placed close to the IC. Also the high side of the external current-sense resistor R_CS.
EP	Exposed PAD	passive	Exposed thermal pad on the underside of the SOT89-5. Internally connected to GND; solder to a ground copper pour for lower thermal resistance (θ_JA = 45 °C/W).

Key specifications

Parameter	Value
Manufacturer	PowTech CR PowTech Shanghai
Package	SOT-89-5
Category	LED-drv
Pins	6

Ordering variants

Same part, different packaging or reel option.

PT4119EE89E

CAD (KiCad official)

Symbol: PT4119EE89E
Footprint: Package_TO_SOT_SMD:SOT-89-5
3D model: SOT-89-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`pt4119ee89e.step`	86 KB	You want the bare part, or you mark your own boards.
`pt4119ee89e-etched.step`	1.7 MB	You want the part with `PT4119EE89E` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 421 faces against 26 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: PowTech CR PowTech Shanghai datasheet (11 pp, sha256 2b280419597fab93, 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