MC14051BDTR2G from onsemi, 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	X4	bidirectional	Analog switch I/O channel 4. Connected to common X (pin 3) when select code C=1, B=0, A=0 and INH=0. Signal range VEE to VDD.
2	X6	bidirectional	Analog switch I/O channel 6. Connected to common X (pin 3) when select code C=1, B=1, A=0 and INH=0. Signal range VEE to VDD.
3	X	bidirectional	Common analog I/O for the 8:1 multiplexer/demultiplexer. Routed to one of X0..X7 by the ABC select code when INH=0; high-impedance when INH=1.
4	X7	bidirectional	Analog switch I/O channel 7. Connected to common X (pin 3) when select code C=1, B=1, A=1 and INH=0. Signal range VEE to VDD.
5	X5	bidirectional	Analog switch I/O channel 5. Connected to common X (pin 3) when select code C=1, B=0, A=1 and INH=0. Signal range VEE to VDD.
6	INH	input	Inhibit (active-high). When INH=1, all eight channels are turned off (common X is high-impedance to all Xn). Referenced to VSS; VIL max 4.5 V and VIH min 5.5 V at VDD=10 V.
7	VEE	power_in	Negative analog supply rail. Sets the lower bound of the analog signal range on X and X0..X7. Must satisfy VEE ≤ VSS; VDD − VEE range 3.0 to 18 V.
8	VSS	power_in	Digital ground / logic reference for control inputs (INH, A, B, C). Typically tied to system ground; must be ≥ VEE.
9	C	input	Binary select input C (MSB of the 3-bit channel address). Combined with B and A selects which of X0..X7 connects to X. Referenced to VSS.
10	B	input	Binary select input B (middle bit of the 3-bit channel address). Referenced to VSS.
11	A	input	Binary select input A (LSB of the 3-bit channel address). Referenced to VSS.
12	X3	bidirectional	Analog switch I/O channel 3. Connected to common X (pin 3) when select code C=0, B=1, A=1 and INH=0.
13	X0	bidirectional	Analog switch I/O channel 0. Connected to common X (pin 3) when select code C=0, B=0, A=0 and INH=0.
14	X1	bidirectional	Analog switch I/O channel 1. Connected to common X (pin 3) when select code C=0, B=0, A=1 and INH=0.
15	X2	bidirectional	Analog switch I/O channel 2. Connected to common X (pin 3) when select code C=0, B=1, A=0 and INH=0.
16	VDD	power_in	Positive supply rail for the digital control section and level converter. 3.0 to 18 V referenced to VSS; also sets the upper bound of the analog signal range on the switch pins.

Key specifications

Parameter	Value
Manufacturer	onsemi
Package	TSSOP-16
Category	Interface
Pins	16

Ordering variants

Same part, different packaging or reel option.

MC14051BDTR2G
MC14051BDTR2GDTG
MC14051BDTR2GDR2G
MC14051BDTR2GDG

CAD (KiCad official)

Symbol: MC14051BDTR2G
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
`mc14051bdtr2g.step`	205 KB	You want the bare part, or you mark your own boards.
`mc14051bdtr2g-etched.step`	2.9 MB	You want the part with `MC14051BDTR2G` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 723 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: onsemi datasheet (11 pp, sha256 b980ba9c7a734408, 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