SN74HC138DR

@@ -0,0 +1,65 @@+# SN74HC138DR++**Texas Instruments** · Signal Switches, Multiplexers, Decoders · SOIC-16++SN74HC138DR from Texas Instruments, in a SOIC-16. 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 | A | input | Select input A (least significant bit). Binary select LSB used together with B and C to choose which of Y0-Y7 is driven LOW. |+| 2 | B | input | Select input B. Middle bit of the 3-bit binary address selecting the active output. |+| 3 | C | input | Select input C (most significant bit). MSB of the 3-bit binary address selecting the active output. |+| 4 | ~{G2A} | input | Active-low enable A. Must be LOW (together with ~G2B LOW and G1 HIGH) to enable decoding; otherwise all Y outputs are forced HIGH. |+| 5 | ~{G2B} | input | Active-low enable B. Must be LOW (together with ~G2A LOW and G1 HIGH) to enable decoding; otherwise all Y outputs are forced HIGH. |+| 6 | G1 | input | Active-high enable. Must be HIGH together with ~G2A LOW and ~G2B LOW to enable outputs; can also serve as a data input for demultiplexing applications. |+| 7 | Y7 | output | Active-low decoded output 7 (most significant). Driven LOW when enables are active and select inputs CBA = 111; otherwise HIGH. Drives up to 10 LSTTL loads (±4 mA at 5 V). |+| 8 | GND | power_in | Ground reference (0 V). |+| 9 | Y6 | output | Active-low decoded output 6. Driven LOW when enables are active and CBA = 110. |+| 10 | Y5 | output | Active-low decoded output 5. Driven LOW when enables are active and CBA = 101. |+| 11 | Y4 | output | Active-low decoded output 4. Driven LOW when enables are active and CBA = 100. |+| 12 | Y3 | output | Active-low decoded output 3. Driven LOW when enables are active and CBA = 011. |+| 13 | Y2 | output | Active-low decoded output 2. Driven LOW when enables are active and CBA = 010. |+| 14 | Y1 | output | Active-low decoded output 1. Driven LOW when enables are active and CBA = 001. |+| 15 | Y0 | output | Active-low decoded output 0 (least significant). Driven LOW when enables are active and CBA = 000. |+| 16 | VCC | power_in | Supply voltage. Recommended 2 V to 6 V (nominal 5 V); absolute maximum 7 V. Typical ICC ≤ 80 µA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-16 |+| Category | Logic |+| Pins | 16 |++## Ordering variants++Same part, different packaging or reel option.++- `SN74HC138DRD`+- `SN74HC138DR`+- `SN74HC138DRDB`+- `SN74HC138DRN`+- `SN74HC138DRNS`+- `SN74HC138DRPW`+- `SN74HC138DRJ`+- `SN74HC138DRW`+- `SN74HC138DRFK`++## CAD (KiCad official)++- Symbol: `SN74HC138DR`+- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`+- 3D model: SOIC-16 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/sn74hc138.pdf) (35 pp, sha256 `ba6cab88a44c1c9a`, 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/sn74hc138dr-datasheet.pdf)

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