PT4115BE89E from CRMICRO, 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. Drain of the internal N-MOS power switch. Connects to the buck inductor / freewheel Schottky diode cathode. Absolute max -0.3 to 45V.
2	GND	power_in	Signal and power ground. Connect directly to the ground plane.
3	DIM	input	Logic-level dimming input. Low (< 0.3V) disables the current regulator; high (> 2.5V) enables full LED current. Accepts PWM dimming (0.1kHz-20kHz) or analog DC dimming (0.5V-2.5V). Internal ~200kΩ pull-up to internal 5V rail. Absolute max -0.3 to 6V.
4	CSN	input	Current sense input. High-side sense; the current sense resistor RS is connected between CSN and VIN. Average sense threshold (VIN-VCSN) is 100mV typ with ±15% hysteresis, setting IOUT = 0.1/RS. Absolute max +0.3 to -6.0V relative to VIN.
5	VIN	power_in	Supply input, 6V to 40V operating (45V abs max). Must be bypassed with a low-ESR capacitor placed close to the pin (≥4.7µF for DC input; ~100µF tantalum for AC/low-voltage input).
EP	Exposed PAD	passive	Exposed thermal pad on package bottom, internally tied to ground. Solder to PCB copper pour to reduce thermal resistance (θJA = 45 °C/W for SOT89-5).

Key specifications

Parameter	Value
Manufacturer	CRMICRO
Package	SOT-89-5
Category	LED-drv
Pins	6

Ordering variants

Same part, different packaging or reel option.

PT4115BE89E

CAD (KiCad official)

Symbol: PT4115BE89E
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
`pt4115be89e.step`	86 KB	You want the bare part, or you mark your own boards.
`pt4115be89e-etched.step`	1.7 MB	You want the part with `PT4115BE89E` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 442 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: CRMICRO datasheet (8 pp, sha256 930dab31eabf58c0, 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