Four independent bilateral (analog) switches in a SOIC-14, the CMOS-logic sibling of the classic CD4066. Each switch is a transmission gate that passes a signal in either direction when its control pin is high and blocks it when low, with a low on-resistance and no fixed input/output distinction. Because it passes analog as well as digital signals, it routes audio, sensor, and reference voltages, builds simple multiplexers and sample-and-hold front ends, and gates control signals. Keep signals within the supply rails. Runs 2-6 V. This page ships the KiCad CD4066 symbol, which is pin-identical.

Pinout

Pin	Name	Type	Function
1	1Y	bidirectional	Switch 1 analog I/O terminal (Y side). Bidirectional analog signal path connected internally to 1Z when 1E is high. Handles analog voltages between GND and Vcc.
2	1Z	bidirectional	Switch 1 analog I/O terminal (Z side). Bidirectional analog signal path connected internally to 1Y when 1E is high.
3	2Z	bidirectional	Switch 2 analog I/O terminal (Z side). Bidirectional analog signal path connected internally to 2Y when 2E is high.
4	2Y	bidirectional	Switch 2 analog I/O terminal (Y side). Bidirectional analog signal path connected internally to 2Z when 2E is high.
5	2E	input	Switch 2 enable/control input. High level (>= VIH) closes the switch between 2Y and 2Z; low level opens it. CMOS logic input referenced to VCC/GND.
6	3E	input	Switch 3 enable/control input. High level (>= VIH) closes the switch between 3Y and 3Z; low level opens it. CMOS logic input referenced to VCC/GND.
7	GND	power_in	Ground reference (0 V). Return current path for the device supply and lower bound of the recommended analog signal range.
8	3Y	bidirectional	Switch 3 analog I/O terminal (Y side). Bidirectional analog signal path connected internally to 3Z when 3E is high.
9	3Z	bidirectional	Switch 3 analog I/O terminal (Z side). Bidirectional analog signal path connected internally to 3Y when 3E is high.
10	4Z	bidirectional	Switch 4 analog I/O terminal (Z side). Bidirectional analog signal path connected internally to 4Y when 4E is high.
11	4Y	bidirectional	Switch 4 analog I/O terminal (Y side). Bidirectional analog signal path connected internally to 4Z when 4E is high.
12	4E	input	Switch 4 enable/control input. High level (>= VIH) closes the switch between 4Y and 4Z; low level opens it. CMOS logic input referenced to VCC/GND.
13	1E	input	Switch 1 enable/control input. High level (>= VIH) closes the switch between 1Y and 1Z; low level opens it. CMOS logic input referenced to VCC/GND.
14	VCC	power_in	Positive supply. 2 V to 10 V for HC types; 4.5 V to 5.5 V for HCT type. Sets the upper bound for analog signal swing and the CMOS logic-input thresholds on the E pins.

Key specifications

Parameter	Value
Type	Quad bilateral analog switch
Switches	4 independent SPST (bidirectional)
Control	one enable per switch (active-high)
On-resistance	~50 Ω typ at 4.5 V
Signal range	rail to rail
Supply voltage	2-6 V
Common uses	analog mux, routing, sample-hold
Package	SOIC-14

Ordering variants

Same part, different packaging or reel option.

CD74HC4066M (SOIC-14, tube)
CD74HC4066M96 (SOIC-14, tape & reel)

CAD (KiCad official)

Symbol: Analog_Switch:CD4066BE (pin-compatible with CD74HC4066)
Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
3D model: SOIC-14 (KiCad packages3D)

Provenance

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

Datasheet: Texas Instruments datasheet (25 pp, sha256 3d3eafb15fb8109c, 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