TD1501S50 from Techcode Semicon, in a TO-263-5. 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	Vin	power_in	Input supply voltage. Recommended operating range 7V to 45V (5V version); absolute maximum 45V. Bypass with a low-ESR input capacitor close to the pin.
2	Output	output	Switching output pin - internal power BJT emitter. Connects to the external catch diode cathode and inductor to form the buck power stage. Delivers up to 3A load current with typical saturation voltage of 1.2V at 3A.
3	GND	power_in	Ground reference for the device. Tie to the system ground plane; also serves as the thermal path together with the package tab.
4	FB	input	Output voltage feedback pin. Internally connected to the fixed-5V resistor divider on the 5V version; connect directly to the regulator output node. Feedback bias current typically 10nA.
5	ON/OFF	input	TTL-compatible shutdown control. Regulator is ON when the pin is low (<1.3V typ) or left floating; regulator enters standby (IQ ≈ 80µA) when driven high (>2.0V). Absolute max Vin+0.3V.

Key specifications

Parameter	Value
Manufacturer	Techcode Semicon
Package	TO-263-5
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

TD1501S50
TD1501S50L50
TD1501S50T50

CAD (KiCad official)

Symbol: TD1501S50
Footprint: Package_TO_SOT_SMD:TO-263-5_TabPin6
3D model: TO-263-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`td1501s50.step`	180 KB	You want the bare part, or you mark your own boards.
`td1501s50-etched.step`	1.8 MB	You want the part with `TD1501S50` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 490 faces against 135 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: Techcode Semicon datasheet (18 pp, sha256 c0e40074baddb703, 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