TMUX1237DCKR from Texas Instruments, in a SC-70-6. 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	S2	bidirectional	Source pin 2. Can be an input or output of the analog switch. Signal path voltage range: 0 V to VDD, continuous current up to 50 mA.
2	VDD	power_in	Positive power supply, 1.08 V to 5.5 V. Most positive power-supply potential. Connect a 0.1 µF to 10 µF decoupling capacitor between VDD and GND for reliable operation.
3	S1	bidirectional	Source pin 1. Can be an input or output of the analog switch. Signal path voltage range: 0 V to VDD, continuous current up to 50 mA.
4	D	bidirectional	Drain pin. Common pin of the SPDT switch; can be an input or output. Connects to S1 when SEL = Low, or to S2 when SEL = High.
5	GND	power_in	Ground (0 V) reference for the device.
6	SEL	input	Select input: controls state of the SPDT switch. Logic Low connects S1 to D; Logic High connects S2 to D. 1.8 V logic compatible; VIH ≥ 1.32 V (at VDD = 5 V), VIL ≤ 0.87 V. Fail-safe logic tolerates control voltage before VDD is applied.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SC-70-6
Category	Comm/UART
Pins	6

Ordering variants

Same part, different packaging or reel option.

TMUX1237DCKR

CAD (KiCad official)

Symbol: TMUX1237DCKR
Footprint: Package_TO_SOT_SMD:SOT-363_SC-70-6
3D model: SC-70-6 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Texas Instruments datasheet (32 pp, sha256 f1adec3edb4d6303, retrieved 2026-08-17, tier: manufacturer)
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