74hc138b

@@ -0,0 +1,52 @@+# 74HC138B++**Shenzhen Fuman** · Signal Switches / Encoders & Decoders / Multiplexers · SOP-16++74HC138B from Shenzhen Fuman, 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 | A0 | input | Address input bit 0 (LSB). Binary-weighted select input used with A1 and A2 to choose which one of the eight outputs Y0-Y7 is driven active-LOW. |+| 2 | A1 | input | Address input bit 1. Binary-weighted select input used with A0 and A2 to choose the active output. |+| 3 | A2 | input | Address input bit 2 (MSB). Binary-weighted select input used with A0 and A1 to choose the active output. |+| 4 | E1 | input | Active-LOW enable input 1. Must be LOW (together with E2 LOW and E3 HIGH) for any decoded output to be asserted; otherwise all Y outputs are held HIGH. |+| 5 | E2 | input | Active-LOW enable input 2. Must be LOW (together with E1 LOW and E3 HIGH) for any decoded output to be asserted; otherwise all Y outputs are held HIGH. |+| 6 | E3 | input | Active-HIGH enable input. Must be HIGH (with E1 and E2 LOW) to enable decoding; otherwise all Y outputs are held HIGH. |+| 7 | Y7 | output | Decoded output 7 (active-LOW). Driven LOW when the device is enabled and A2:A0 = 111; HIGH otherwise. |+| 8 | GND | power_in | Ground reference (0 V). Return for VCC and all logic signals. |+| 9 | Y6 | output | Decoded output 6 (active-LOW). Driven LOW when the device is enabled and A2:A0 = 110; HIGH otherwise. |+| 10 | Y5 | output | Decoded output 5 (active-LOW). Driven LOW when the device is enabled and A2:A0 = 101; HIGH otherwise. |+| 11 | Y4 | output | Decoded output 4 (active-LOW). Driven LOW when the device is enabled and A2:A0 = 100; HIGH otherwise. |+| 12 | Y3 | output | Decoded output 3 (active-LOW). Driven LOW when the device is enabled and A2:A0 = 011; HIGH otherwise. |+| 13 | Y2 | output | Decoded output 2 (active-LOW). Driven LOW when the device is enabled and A2:A0 = 010; HIGH otherwise. |+| 14 | Y1 | output | Decoded output 1 (active-LOW). Driven LOW when the device is enabled and A2:A0 = 001; HIGH otherwise. |+| 15 | Y0 | output | Decoded output 0 (active-LOW). Driven LOW when the device is enabled and A2:A0 = 000; HIGH otherwise. |+| 16 | VCC | power_in | Positive supply voltage, 3.0 V to 5.0 V operating range. Decouple to GND close to the package. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Shenzhen Fuman |+| Package | SOP-16 |+| Category | Logic |+| Pins | 16 |++## CAD (KiCad official)++- Symbol: `74HC138B`+- 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:** [Shenzhen Fuman datasheet](docs/74hc138b-datasheet.pdf) (None pp, sha256 `6a07f88ccb28e80f`, 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/74hc138b-datasheet.pdf)

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