74HC4051D from Nexperia, in a SOIC-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	Independent input/output channel 4. When selected via S2:S0 = 100 and E is LOW, this pin is connected to the common Z pin through the analog switch (typ. 60-80 Ω ON).
2	Y6	bidirectional	Independent input/output channel 6. When selected via S2:S0 = 110 and E is LOW, this pin is connected to Z through the analog switch.
3	Z	bidirectional	Common analog input/output. Connected to one of Y0-Y7 as selected by S0/S1/S2 when the enable input E is LOW. Analog signal range VEE to VCC.
4	Y7	bidirectional	Independent input/output channel 7. When selected via S2:S0 = 111 and E is LOW, this pin is connected to Z through the analog switch.
5	Y5	bidirectional	Independent input/output channel 5. When selected via S2:S0 = 101 and E is LOW, this pin is connected to Z through the analog switch.
6	E	input	Active-LOW enable input. When E is LOW the selected Yn-to-Z switch is ON; when E is HIGH all switches are OFF (device disabled). Digital input, VEE to VCC.
7	VEE	power_in	Negative analog supply voltage. Sets the lower rail for the analog switch pass range. VCC - VEE up to 10 V; VEE typically GND for single-supply operation, or negative for bipolar analog signals (e.g. -5 V for ±5 V analog range).
8	GND	power_in	Ground supply voltage (0 V reference). Reference for the digital control inputs (S0, S1, S2, E).
9	S2	input	Digital channel-select input, bit 2 (MSB). Combined with S1/S0 selects which of Y0-Y7 is connected to Z. Digital levels referenced to GND/VCC.
10	S1	input	Digital channel-select input, bit 1. Combined with S2/S0 selects which of Y0-Y7 is connected to Z.
11	S0	input	Digital channel-select input, bit 0 (LSB). Combined with S2/S1 selects which of Y0-Y7 is connected to Z.
12	Y3	bidirectional	Independent input/output channel 3. When selected via S2:S0 = 011 and E is LOW, this pin is connected to Z through the analog switch.
13	Y0	bidirectional	Independent input/output channel 0. When selected via S2:S0 = 000 and E is LOW, this pin is connected to Z through the analog switch.
14	Y1	bidirectional	Independent input/output channel 1. When selected via S2:S0 = 001 and E is LOW, this pin is connected to Z through the analog switch.
15	Y2	bidirectional	Independent input/output channel 2. When selected via S2:S0 = 010 and E is LOW, this pin is connected to Z through the analog switch.
16	VCC	power_in	Positive supply voltage. 74HC4051: 2.0-10.0 V (referenced to GND); 74HCT4051: 4.5-5.5 V. VCC - VEE up to 10 V.

Key specifications

Parameter	Value
Manufacturer	Nexperia
Package	SOIC-16
Category	Interface
Pins	16

Ordering variants

74HC4051DD
74HC4051DPW
74HC4051DBQ
74HC4051DBZ

CAD (KiCad official)

Symbol: 74HC4051D
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOIC-16 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`74hc4051d.step`	217 KB	You want the bare part, or you mark your own boards.
`74hc4051d-etched.step`	2.1 MB	You want the part with `74HC4051D` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 541 faces against 267 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: Nexperia datasheet (28 pp, sha256 e5b40e804e4dea04, 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