74HC138M

@@ -0,0 +1,58 @@+# 74HC138M++**HGSEMI** · Signal Switches / Encoders & Decoders / Multiplexers · SOP-16++74HC138M from HGSEMI, in a SOP-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 | Address select input bit 0 (LSB). Binary-weighted select input combined with B and C to choose which of Y0-Y7 is asserted low. |+| 2 | B | input | Address select input bit 1. Binary-weighted select input combined with A and C to choose the active output. |+| 3 | C | input | Address select input bit 2 (MSB). Binary-weighted select input combined with A and B to choose the active output. |+| 4 | ~{G2A} | input | Active-low enable input. Both G2A and G2B must be low (and G1 high) for any output to be selected; otherwise all outputs are held high. |+| 5 | ~{G2B} | input | Active-low enable input. Both G2A and G2B must be low (and G1 high) for any output to be selected; otherwise all outputs are held high. |+| 6 | G1 | input | Active-high enable input. Must be high (with G2A and G2B low) to enable the decoder outputs. |+| 7 | Y7 | output | Decoded output 7 (active-low). Driven low when enabled and CBA = 111; otherwise high. Drive capability 5.2 mA at VCC=6V. |+| 8 | GND | power_in | Ground / negative supply reference (0 V). |+| 9 | Y6 | output | Decoded output 6 (active-low). Driven low when enabled and CBA = 110; otherwise high. |+| 10 | Y5 | output | Decoded output 5 (active-low). Driven low when enabled and CBA = 101; otherwise high. |+| 11 | Y4 | output | Decoded output 4 (active-low). Driven low when enabled and CBA = 100; otherwise high. |+| 12 | Y3 | output | Decoded output 3 (active-low). Driven low when enabled and CBA = 011; otherwise high. |+| 13 | Y2 | output | Decoded output 2 (active-low). Driven low when enabled and CBA = 010; otherwise high. |+| 14 | Y1 | output | Decoded output 1 (active-low). Driven low when enabled and CBA = 001; otherwise high. |+| 15 | Y0 | output | Decoded output 0 (active-low). Driven low when enabled and CBA = 000; otherwise high. |+| 16 | VCC | power_in | Positive supply input. Operating range 2.0 V to 6.0 V (absolute max 6.5 V). Bypass with a 100 nF ceramic close to the pin. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | HGSEMI |+| Package | SOP-16 |+| Category | Logic |+| Pins | 16 |++## Ordering variants++- `74HC138M/TR`+- `74HC138M74HC138N`+- `74HC138MT/TR`+- `74HC138M74HC138LQ/TR`++## CAD (KiCad official)++- Symbol: `74HC138M`+- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`+- 3D model: SOP-16 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [HGSEMI datasheet](docs/74hc138m-datasheet.pdf) (10 pp, sha256 `c1019058ded7c03f`, retrieved 2026-08-17, tier: lcsc)+- **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/74hc138m-datasheet.pdf)

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