74HC4051LQ

@@ -0,0 +1,60 @@+# 74HC4051LQ++**HGSEMI** · Analog Switches, Multiplexers · QFN-16(3x3)++74HC4051LQ from HGSEMI, in a QFN-16(3x3). 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 | Y4 | bidirectional | Independent analog I/O channel 4. Connects to common Z pin when A2:A0 = 100 and E is low. On-resistance ~50-350 Ω depending on VDD-VEE. |+| 2 | Y6 | bidirectional | Independent analog I/O channel 6. Connects to common Z pin when A2:A0 = 110 and E is low. |+| 3 | Z | bidirectional | Common analog I/O. Routes to one of Y0-Y7 selected by A2:A0 when E is low. High-impedance when E is high. |+| 4 | Y7 | bidirectional | Independent analog I/O channel 7. Connects to common Z pin when A2:A0 = 111 and E is low. |+| 5 | Y5 | bidirectional | Independent analog I/O channel 5. Connects to common Z pin when A2:A0 = 101 and E is low. |+| 6 | E | input | Active-low enable input. When low, one Y channel is connected to Z per A2:A0; when high, all channels are turned off (high-impedance). |+| 7 | VEE | power_in | Negative analog supply. Range -6 V to 0 V; sets lower analog signal rail. Tie to VSS for single-supply digital multiplexer use. |+| 8 | VSS | power_in | Digital ground / reference for digital control inputs (A0-A2, E). |+| 9 | A2 | input | Address select input bit 2 (MSB). Digital logic level referenced to VDD/VSS. |+| 10 | A1 | input | Address select input bit 1. Digital logic level referenced to VDD/VSS. |+| 11 | A0 | input | Address select input bit 0 (LSB). Digital logic level referenced to VDD/VSS. |+| 12 | Y3 | bidirectional | Independent analog I/O channel 3. Connects to common Z pin when A2:A0 = 011 and E is low. |+| 13 | Y0 | bidirectional | Independent analog I/O channel 0. Connects to common Z pin when A2:A0 = 000 and E is low. |+| 14 | Y1 | bidirectional | Independent analog I/O channel 1. Connects to common Z pin when A2:A0 = 001 and E is low. |+| 15 | Y2 | bidirectional | Independent analog I/O channel 2. Connects to common Z pin when A2:A0 = 010 and E is low. |+| 16 | VDD | power_in | Positive supply. Operating range 3.0 V to 9.0 V (with VDD-VEE ≤ 9 V). Powers digital logic and sets upper analog signal rail. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | HGSEMI |+| Package | QFN-16(3x3) |+| Category | Interface |+| Pins | 16 |++## Ordering variants++- `74HC4051LQ/TR`+- `74HC4051LQN`+- `74HC4051LQM/TR`+- `74HC4051LQMT/TR`+- `74HC4051LQMS/TR`++## CAD (KiCad official)++- Symbol: `74HC4051LQ`+- Footprint: `Package_DFN_QFN:MPS_QFN-16_3x3mm_P0.5mm`+- 3D model: QFN-16(3x3) (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [HGSEMI datasheet](docs/74hc4051lq-datasheet.pdf) (16 pp, sha256 `f2f56de053e5258f`, 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](docs/74hc4051lq-datasheet.pdf)

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