# SN74HC158DT

**Texas Instruments** · Signal Switches, Multiplexers, Decoders · SOIC-16

SN74HC158DT from Texas Instruments, in a SOIC-16. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | A/B | input | Data select input; low selects A inputs, high selects B inputs for all channels |
| 2 | 1A | input | Data input A for channel 1; selected when A/B is low |
| 3 | 1B | input | Data input B for channel 1; selected when A/B is high |
| 4 | 1Y | output | Inverted output for channel 1; outputs inverted data from selected input when G is low, high when G is high |
| 5 | 2A | input | Data input A for channel 2; selected when A/B is low |
| 6 | 2B | input | Data input B for channel 2; selected when A/B is high |
| 7 | 2Y | output | Inverted output for channel 2; outputs inverted data from selected input when G is low, high when G is high |
| 8 | GND | power_in | Ground; connection point for logic reference (0 V) |
| 9 | 3Y | output | Inverted output for channel 3; outputs inverted data from selected input when G is low, high when G is high |
| 10 | 3B | input | Data input B for channel 3; selected when A/B is high |
| 11 | 3A | input | Data input A for channel 3; selected when A/B is low |
| 12 | 4Y | output | Inverted output for channel 4; outputs inverted data from selected input when G is low, high when G is high |
| 13 | 4B | input | Data input B for channel 4; selected when A/B is high |
| 14 | 4A | input | Data input A for channel 4; selected when A/B is low |
| 15 | G | input | Strobe (output enable) input, active low; outputs are high when G is high, selected data routed to outputs when G is low |
| 16 | VCC | power_in | Supply voltage, positive power connection; operating voltage range 2 V to 6 V |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Logic |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `SN74HC158DT`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files: `sn74hc158dt-etched.step` / `sn74hc158dt-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74hc158dt.step` / `sn74hc158dt.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/sn74hc158) (19 pp, sha256 `2dab2a1df902eb79`, retrieved 2026-10-05, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/sn74hc158dt-datasheet.pdf)