CD74HC4051PWR 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	A4	bidirectional	Channel 4 in/out. Bidirectional analog switch terminal; connected to COM (pin 3) when selected via S2:S0 = 100 and !E is low.
2	A6	bidirectional	Channel 6 in/out. Bidirectional analog switch terminal; connected to COM (pin 3) when selected via S2:S0 = 110 and !E is low.
3	COM	bidirectional	Common out/in. Shared analog terminal connected to one of A0..A7 based on address inputs S0..S2. Bidirectional analog signal path.
4	A7	bidirectional	Channel 7 in/out. Bidirectional analog switch terminal; connected to COM (pin 3) when selected via S2:S0 = 111 and !E is low.
5	A5	bidirectional	Channel 5 in/out. Bidirectional analog switch terminal; connected to COM (pin 3) when selected via S2:S0 = 101 and !E is low.
6	~{E}	input	Enable, active low. When low, the selected channel is connected to COM. When high, all switches are disabled (high impedance).
7	VEE	power_in	Negative analog supply. Sets the lower limit of the analog signal range. Recommended range 0 V to -6 V; VCC-VEE must be 2 V to 10 V.
8	GND	power_in	Ground / digital and logic reference (0 V). All voltages are referenced to this pin unless otherwise specified.
9	S2	input	Channel select bit 2 (MSB). Digital input selecting which of A0..A7 is routed to COM. LSTTL/CMOS-level input; VIH >= 2 V, VIL <= 0.8 V (HCT).
10	S1	input	Channel select bit 1. Digital input selecting which of A0..A7 is routed to COM. LSTTL/CMOS-level input.
11	S0	input	Channel select bit 0 (LSB). Digital input selecting which of A0..A7 is routed to COM. LSTTL/CMOS-level input.
12	A3	bidirectional	Channel 3 in/out. Bidirectional analog switch terminal; connected to COM (pin 3) when selected via S2:S0 = 011 and !E is low.
13	A0	bidirectional	Channel 0 in/out. Bidirectional analog switch terminal; connected to COM (pin 3) when selected via S2:S0 = 000 and !E is low.
14	A1	bidirectional	Channel 1 in/out. Bidirectional analog switch terminal; connected to COM (pin 3) when selected via S2:S0 = 001 and !E is low.
15	A2	bidirectional	Channel 2 in/out. Bidirectional analog switch terminal; connected to COM (pin 3) when selected via S2:S0 = 010 and !E is low.
16	VCC	power_in	Positive digital/analog supply. Recommended 2 V to 6 V for HC parts (4.5 V to 5.5 V for HCT). Sets the upper limit of the analog signal range.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

CD74HC4051PWR
CD74HC4051PWRD
CD74HC4051PWRDR
CD74HC4051PWRNS
CD74HC4051PWRNSR
CD74HC4051PWRN
CD74HC4051PWRNE
CD74HC4051PWRJ

CAD (KiCad official)

Symbol: CD74HC4051PWR
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
`cd74hc4051pwr.step`	205 KB	You want the bare part, or you mark your own boards.
`cd74hc4051pwr-etched.step`	2.7 MB	You want the part with `CD74HC4051PWR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 683 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 (50 pp, sha256 7bf0d4b1a02045fc, 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