PT4205E89E 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	Drain of the internal high-side power MOSFET (Rds(on) ~0.4Ω @ Vin=24V). Connects to the switching node between the inductor and the freewheel Schottky diode. Rated to 40V absolute max, 1.5A peak switch current.
2	GND	power_in	Signal and power ground return for the IC. Connect to system ground with a low-impedance path near the input bypass capacitor.
3	DIM	input	Switch-enable plus analog and PWM dimming input. VDIM<0.3V shuts down (Ioff≈130µA); VDIM>2.5V gives full LED current; 0.5-2.5V linearly scales current (analog dim). PWM dimming supported from 100Hz to >20kHz (max 50kHz). Absolute max 30V; internal 20µA pull-up to ~4.7V rail when floating.
4	CSN	input	High-side current-sense input. Connect the sense resistor Rs between VIN and CSN; average sense voltage V(VIN-CSN)=200mV nominal (194-206mV), setting LED current I=0.2/Rs. Input bias current 8µA typ; abs-max +0.3V to -6V relative to VIN.
5	VIN	power_in	Power supply input, 5-30V operating (40V abs-max). Requires a nearby bypass capacitor (typ 100µF) to ground. UVLO falls at ~4.5V with 200mV hysteresis.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

PT4205E89E
PT4205E89EESH

CAD (KiCad official)

Symbol: PT4205E89E
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
`pt4205e89e.step`	86 KB	You want the bare part, or you mark your own boards.
`pt4205e89e-etched.step`	1.8 MB	You want the part with `PT4205E89E` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 437 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 (16 pp, sha256 95a5da70ac4ead9b, 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