TMUX1133PWR from Texas Instruments, in a TSSOP-16. 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	S2B	bidirectional	Source pin 2B. Bidirectional analog signal I/O for switch 2 (throw B). Signal range VSS to VDD.
2	S2A	bidirectional	Source pin 2A. Bidirectional analog signal I/O for switch 2 (throw A). Signal range VSS to VDD.
3	S3B	bidirectional	Source pin 3B. Bidirectional analog signal I/O for switch 3 (throw B). Signal range VSS to VDD.
4	D3	bidirectional	Drain pin 3. Bidirectional common (pole) I/O for switch 3. Signal range VSS to VDD.
5	S3A	bidirectional	Source pin 3A. Bidirectional analog signal I/O for switch 3 (throw A). Signal range VSS to VDD.
6	EN	input	Active-low logic enable. When high, all switches are turned off. When low, the SELx inputs determine switch connections. 1.8V logic compatible, VIH up to VDD.
7	VSS	power_in	Negative power supply. Most negative supply potential (0V single-supply, down to −2.75V dual-supply). Decouple with 0.1µF-10µF to GND. Tie to GND for single-supply operation.
8	GND	power_in	Ground (0V) reference.
9	SEL3	input	Logic control select for switch 3. Selects between S3A and S3B connection to D3 as listed in Table 8-1. 1.8V logic compatible.
10	SEL2	input	Logic control select for switch 2. Selects between S2A and S2B connection to D2 as listed in Table 8-1. 1.8V logic compatible.
11	SEL1	input	Logic control select for switch 1. Selects between S1A and S1B connection to D1 as listed in Table 8-1. 1.8V logic compatible.
12	S1A	bidirectional	Source pin 1A. Bidirectional analog signal I/O for switch 1 (throw A). Signal range VSS to VDD.
13	S1B	bidirectional	Source pin 1B. Bidirectional analog signal I/O for switch 1 (throw B). Signal range VSS to VDD.
14	D1	bidirectional	Drain pin 1. Bidirectional common (pole) I/O for switch 1. Signal range VSS to VDD.
15	D2	bidirectional	Drain pin 2. Bidirectional common (pole) I/O for switch 2. Signal range VSS to VDD.
16	VDD	power_in	Positive power supply. Most positive supply potential (1.08V-5.5V). Decouple with 0.1µF-10µF between VDD and GND.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	TSSOP-16
Category	Interface
Pins	16

Ordering variants

Same part, different packaging or reel option.

TMUX1133PWR

CAD (KiCad official)

Symbol: TMUX1133PWR
Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
3D model: TSSOP-16 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`tmux1133pwr.step`	205 KB	You want the bare part, or you mark your own boards.
`tmux1133pwr-etched.step`	2.5 MB	You want the part with `TMUX1133PWR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 632 faces against 255 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: Texas Instruments datasheet (42 pp, sha256 08082d5484460c92, 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