CD74HC4066

@@ -0,0 +1,58 @@+# CD74HC4066++**Texas Instruments** · Quad bilateral analog switch · SOIC-14++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++- `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](https://www.ti.com/lit/ds/symlink/cd74hc4066.pdf) (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](docs/cd74hc4066-datasheet.pdf)

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