SN74LV4051APWR 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	Y4	bidirectional	Analog switch channel 4 input/output to mux. Bidirectional switch terminal; connects to COM when A=0,B=0,C=1 and INH=low.
2	Y6	bidirectional	Analog switch channel 6 input/output to mux. Bidirectional switch terminal; connects to COM when A=0,B=1,C=1 and INH=low.
3	COM	bidirectional	Common terminal of the mux; output when device is used as a multiplexer, input when used as a demultiplexer. Connects to the selected Yn channel.
4	Y7	bidirectional	Analog switch channel 7 input/output to mux. Bidirectional switch terminal; connects to COM when A=1,B=1,C=1 and INH=low.
5	Y5	bidirectional	Analog switch channel 5 input/output to mux. Bidirectional switch terminal; connects to COM when A=1,B=0,C=1 and INH=low.
6	INH	input	Inhibit / enable input. Logic-low enables all switches (device active); logic-high disables all channels, placing switches in the OFF state.
7	GND	power_in	Ground reference for logic and switch circuitry. Tie to system ground.
8	GND	power_in	Ground reference (second GND pin). Tie to system ground.
9	C	input	Selector line C (MSB of the 3-bit channel select). Together with A and B selects which Yn channel connects to COM.
10	B	input	Selector line B (middle bit of the 3-bit channel select). Together with A and C selects which Yn channel connects to COM.
11	A	input	Selector line A (LSB of the 3-bit channel select). Together with B and C selects which Yn channel connects to COM.
12	Y3	bidirectional	Analog switch channel 3 input/output to mux. Bidirectional switch terminal; connects to COM when A=1,B=1,C=0 and INH=low.
13	Y0	bidirectional	Analog switch channel 0 input/output to mux. Bidirectional switch terminal; connects to COM when A=0,B=0,C=0 and INH=low.
14	Y1	bidirectional	Analog switch channel 1 input/output to mux. Bidirectional switch terminal; connects to COM when A=1,B=0,C=0 and INH=low.
15	Y2	bidirectional	Analog switch channel 2 input/output to mux. Bidirectional switch terminal; connects to COM when A=0,B=1,C=0 and INH=low.
16	VCC	power_in	Device power supply, 1.65 V to 5.5 V. Bypass with a ceramic capacitor to GND.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SN74LV4051APWR
SN74LV4051APWRDR
SN74LV4051APWRD
SN74LV4051APWRDYYR
SN74LV4051APWRDYY
SN74LV4051APWRRGYR
SN74LV4051APWRRGY

CAD (KiCad official)

Symbol: SN74LV4051APWR
Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
3D model: TSSOP-16 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Texas Instruments datasheet (41 pp, sha256 2e2adcd3b48ee2ed, 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