CD4066DMS from HGSEMI, in a QSOP-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	IN/OUT A	bidirectional	Switch A analog signal terminal (bidirectional). Paired with pin 2 through the SPST switch; either pin may serve as input or output. Signal range VSS ≤ VIS ≤ VDD.
2	OUT/IN A	bidirectional	Switch A analog signal terminal (bidirectional). Paired with pin 1 through the SPST switch.
3	OUT/IN B	bidirectional	Switch B analog signal terminal (bidirectional). Paired with pin 4.
4	IN/OUT B	bidirectional	Switch B analog signal terminal (bidirectional). Paired with pin 3.
5	EN B	input	Switch B control (enable) input. Logic 1 (EN=VDD) closes the switch; logic 0 (EN=VSS) opens it (Hi-Z). Very high input impedance CMOS control.
6	EN C	input	Switch C control (enable) input. Logic 1 closes the switch; logic 0 opens it.
7	VSS	power_in	Negative supply / ground reference. VDD-VSS operating range 3 V to 15 V (absolute max 18 V). Analog signals must remain between VSS and VDD.
8	NC	unconnected	No internal connection.
9	NC	unconnected	No internal connection.
10	IN/OUT C	bidirectional	Switch C analog signal terminal (bidirectional). Paired with pin 11.
11	OUT/IN C	bidirectional	Switch C analog signal terminal (bidirectional). Paired with pin 10.
12	OUT/IN D	bidirectional	Switch D analog signal terminal (bidirectional). Paired with pin 13.
13	IN/OUT D	bidirectional	Switch D analog signal terminal (bidirectional). Paired with pin 12.
14	EN D	input	Switch D control (enable) input. Logic 1 closes the switch; logic 0 opens it.
15	EN A	input	Switch A control (enable) input. Logic 1 closes the switch; logic 0 opens it.
16	VDD	power_in	Positive supply. VDD-VSS operating range 3 V to 15 V; absolute max 18 V. Also sets logic-high threshold for the EN inputs.

Key specifications

Parameter	Value
Manufacturer	HGSEMI
Package	QSOP-16
Category	Interface
Pins	16

Ordering variants

Same part, different packaging or reel option.

CD4066DMS/TR
CD4066DMSDN
CD4066DMSDM/TR
CD4066DMSDMT/TR
CD4066DMSDLQ/TR

CAD (KiCad official)

Symbol: CD4066DMS
Footprint: Package_SO:QSOP-16_3.9x4.9mm_P0.635mm
3D model: QSOP-16 (KiCad packages3D, STEP)

Provenance

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

Datasheet: HGSEMI datasheet (13 pp, sha256 9ac7644695df6892, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
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