component
CD4051B
Public Unreviewedby adom
TI CMOS 8-channel analog multiplexer/demultiplexer, SOIC-16. 3-A/B/C select, INH, VEE for bipolar. Datasheet-verified.
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README.md+57−2@@ -1,5 +1,60 @@ # CD4051B -8-channel analog multiplexer/demultiplexer, DIP-16+**Texas Instruments** · 8-channel analog mux / demux · SOIC-16 -The CD4051B is a single 8-channel analog multiplexer/demultiplexer. It can switch analog or digital signals with low on-resistance. Used for expanding ADC inputs, audio routing, and sensor multiplexing.+CMOS single 8-channel analog multiplexer / demultiplexer with logic-level conversion, in a SOIC-16 package. A 3-bit binary address (A, B, C) connects one of eight channels (CH0-CH7) to the common COM pin bidirectionally, so it works as a mux or a demux. An active-high INH inhibit floats all channels, and a separate VEE lets it pass bipolar analog signals below ground. VDD spans 3-18 V. The classic way to read many analog inputs on one MCU ADC pin.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | CH4 | bidirectional | Channel 4 analog in/out. Bidirectional analog switch terminal; connects to COM when address = 100 and INH = 0. |+| 2 | CH6 | bidirectional | Channel 6 analog in/out. Bidirectional analog switch terminal; connects to COM when address = 110 and INH = 0. |+| 3 | COM | bidirectional | Common out/in. Shared analog terminal that is switched to the addressed channel (CH0–CH7). Signal may swing from VEE to VDD. |+| 4 | CH7 | bidirectional | Channel 7 analog in/out. Bidirectional analog switch terminal; connects to COM when address = 111 and INH = 0. |+| 5 | CH5 | bidirectional | Channel 5 analog in/out. Bidirectional analog switch terminal; connects to COM when address = 101 and INH = 0. |+| 6 | INH | input | Inhibit (active-high). When INH = 1 (VDD), all channels are OFF (disconnected from COM). When INH = 0 (VSS), the channel selected by A/B/C is connected to COM. |+| 7 | VEE | power_in | Negative analog supply. Sets the lower end of the analog signal range; may be tied to VSS for single-supply operation or to a negative rail (e.g. −5V) for dual-supply. VDD − VEE ≤ 20V. |+| 8 | VSS | power_in | Digital/logic ground reference. Logic 0 level for INH and address inputs A/B/C. |+| 9 | C | input | Channel select address bit C (MSB). Digital input; logic levels 0 = VSS, 1 = VDD. Selects one of eight channels together with A and B. |+| 10 | B | input | Channel select address bit B. Digital input; logic levels 0 = VSS, 1 = VDD. |+| 11 | A | input | Channel select address bit A (LSB). Digital input; logic levels 0 = VSS, 1 = VDD. |+| 12 | CH3 | bidirectional | Channel 3 analog in/out. Bidirectional analog switch terminal; connects to COM when address = 011 and INH = 0. |+| 13 | CH0 | bidirectional | Channel 0 analog in/out. Bidirectional analog switch terminal; connects to COM when address = 000 and INH = 0. |+| 14 | CH1 | bidirectional | Channel 1 analog in/out. Bidirectional analog switch terminal; connects to COM when address = 001 and INH = 0. |+| 15 | CH2 | bidirectional | Channel 2 analog in/out. Bidirectional analog switch terminal; connects to COM when address = 010 and INH = 0. |+| 16 | VDD | power_in | Positive supply. VDD − VSS = 3V to 20V (performance degrades below 3V). Absolute maximum V+ to V− = 20V. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | 8-channel analog mux / demux |+| Channels | 8 (CH0-CH7 <-> COM) |+| Control | 3-bit address A/B/C + INH inhibit |+| Signal range | Bipolar (VDD to VEE) |+| Supply (VDD) | 3-18 V |+| Direction | Bidirectional (mux or demux) |+| Package | SOIC-16 |+| Body (L×W×H) | 9.9 × 3.9 × 1.75 mm |++## Ordering variants++- `CD4051BM (SOIC-16, tube)`+- `CD4051BNSR (SO-16)`++## CAD (KiCad official)++- Symbol: `Analog_Switch:CD4051B`+- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`+- 3D model: SOIC-16 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/cd4051b.pdf) (39 pp, sha256 `3fbac7b3f3463b15`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude) — every pin and dimension is cited to a datasheet page; refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/cd4051b-datasheet.pdf)
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package.jsonadded+30@@ -0,0 +1,30 @@+{+ "slug": "cd4051b",+ "version": "0.1.0",+ "type": "component",+ "description": "TI CMOS 8-channel analog multiplexer/demultiplexer, SOIC-16. 3-A/B/C select, INH, VEE for bipolar. Datasheet-verified.",+ "tags": [+ "component",+ "multiplexer",+ "analog-switch",+ "mux",+ "soic-16",+ "texas-instruments"+ ],+ "dependencies": {},+ "hero": {+ "type": "image",+ "path": "docs/hero.png"+ },+ "files": [+ "page.json",+ "README.md",+ "cd4051b.kicad_sym",+ "cd4051b.kicad_mod",+ "cd4051b.glb",+ "docs/hero.png",+ "docs/cd4051b-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html"+ ]+}
page.json+27−7@@ -4,8 +4,15 @@ "slug": "cd4051b", "title": "CD4051B", "brief": "8-channel analog multiplexer/demultiplexer, DIP-16",- "version": "1.0.0",- "tags": [],+ "version": "0.1.0",+ "tags": [+ "component",+ "multiplexer",+ "analog-switch",+ "mux",+ "soic-16",+ "texas-instruments"+ ], "license": "MIT", "component": { "mpn": "CD4051B",@@ -20,18 +27,31 @@ }, "readme": "# CD4051B\n\n8-channel analog multiplexer/demultiplexer, DIP-16\n\nThe CD4051B is a single 8-channel analog multiplexer/demultiplexer. It can switch analog or digital signals with low on-resistance. Used for expanding ADC inputs, audio routing, and sensor multiplexing.", "author": {- "id": "695820315b5f1e4db2fcf602", "name": "Kyle Bergstedt", "email": "[email protected]" },- "visibility": {- "public": true+ "visibility": "public",+ "hero": {+ "type": "image",+ "path": "docs/hero.png" },- "hero": null, "sample_prompts": [], "discovery_triggers": [], "discovery_pitch": null, "metadata": {}, "created_at": "2026-05-28T05:33:23.164Z",- "updated_at": "2026-05-28T05:33:23.164Z"+ "updated_at": "2026-05-28T05:33:23.164Z",+ "description": "TI CMOS 8-channel analog multiplexer/demultiplexer, SOIC-16. 3-A/B/C select, INH, VEE for bipolar. Datasheet-verified.",+ "dependencies": {},+ "files": [+ "page.json",+ "README.md",+ "cd4051b.kicad_sym",+ "cd4051b.kicad_mod",+ "cd4051b.glb",+ "docs/hero.png",+ "docs/cd4051b-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html"+ ] }