TTP223-TD from TDSEMIC, in a SOT-23-6. 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	OUT	output	Push-pull touch detection output. Polarity (active-high or active-low) is set by SLH; behavior (direct/toggle) is set by STG. Sink capability IOL=10mA at VOL=0.6V, source capability IOH=-6mA at VOH=2.4V (VDD=3V). Max response time 60ms.
2	GND	power_in	Power ground (VSS reference).
3	SO	input	Touch sensor input. Connects to the external touch sensing pad, typically through an optional 100-1000Ω series resistor (Rs) for improved EMI immunity. Sensitivity is set by an external capacitor (C1, 0-50pF) from this pin to GND - larger C = lower sensitivity.
4	SLH	input	Output active-level select. Tie to GND → OUT is active-high on touch (idle low); tie to VDD → OUT is active-low on touch (idle high). Must NOT be left floating.
5	VDD	power_in	Positive supply, 2.0V to 5.5V (typ 3.0V). Typical operating current 2.5uA (max 7uA) at VDD=3.0V. Onboard LDO provides internal regulation.
6	STG	input	Mode select strap. Tie to GND → direct/synchronous output mode (OUT follows touch, like a momentary key); tie to VDD → toggle/latched mode (OUT flips state on each touch, like a self-locking switch). Max continuous touch time 6s in either mode. Must NOT be left floating.

Key specifications

Parameter	Value
Manufacturer	TDSEMIC
Package	SOT-23-6
Category	Sensor
Pins	6

Ordering variants

Same part, different packaging or reel option.

TTP223-TD

CAD (KiCad official)

Symbol: TTP223-TD
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ttp223-td.step`	97 KB	You want the bare part, or you mark your own boards.
`ttp223-td-etched.step`	1.5 MB	You want the part with `TTP223-TD` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 385 faces against 117 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: TDSEMIC datasheet (6 pp, sha256 62ca6bb632f6de27, 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