TD6811 from Techcode Semicon, in a TSOT-23-5. 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	RUN	input	Run Control Input. Forcing this pin above 1.5V enables the part; forcing it below 0.3V shuts down the device. In shutdown, all functions are disabled, drawing <1uA supply current. Do not leave RUN floating.
2	GND	power_in	Ground pin. Return for the internal power stage and control circuitry; must provide a low-impedance return to the input decoupling capacitor.
3	SW	output	Switch Node connection to the external inductor. Connects to the drains of the internal main P-channel and synchronous N-channel power MOSFET switches. Peak SW current rated 1.8A.
4	VIN	power_in	Main Supply Pin, 2.5V to 5.5V input range. Must be closely decoupled to GND (Pin 2) with a 2.2uF or greater ceramic capacitor.
5	VFB/VOUT	input	Dual-function feedback pin. On the adjustable version (TD6811, blank suffix) this is VFB, which receives the feedback voltage from an external resistive divider across the output and regulates to the 0.6V internal reference. On fixed-output versions (TD6811-12/-15/-18) it is VOUT, connecting directly to the output rail so an internal resistive divider sets 1.2V/1.5V/1.8V.

Key specifications

Parameter	Value
Manufacturer	Techcode Semicon
Package	TSOT-23-5
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

TD6811T
TD6811T12
TD6811T15
TD6811T18

CAD (KiCad official)

Symbol: TD6811
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: TSOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`td6811.step`	85 KB	You want the bare part, or you mark your own boards.
`td6811-etched.step`	1.3 MB	You want the part with `TD6811` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 314 faces against 102 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 (17 pp, sha256 abf6be4c3bb33c72, 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