MC74HC138ADTR2G

@@ -0,0 +1,65 @@+# MC74HC138ADTR2G++**onsemi** · Signal Switches / Encoders & Decoders / Multiplexers · TSSOP-16++MC74HC138ADTR2G from onsemi, in a TSSOP-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. Together with A1 and A2, selects which of the eight Y outputs is driven low when the chip is enabled. |+| 2 | A1 | input | Address input bit 1. Together with A0 and A2, selects which of the eight Y outputs is driven low when the chip is enabled. |+| 3 | A2 | input | Address input bit 2. Together with A0 and A1, selects which of the eight Y outputs is driven low when the chip is enabled. |+| 4 | CS2 | input | Chip-select input 2 (active-low). Must be low, along with CS3 low and CS1 high, for the chip to be selected and outputs to follow the address inputs. |+| 5 | CS3 | input | Chip-select input 3 (active-low). Must be low, along with CS2 low and CS1 high, for the chip to be selected and outputs to follow the address inputs. |+| 6 | CS1 | input | Chip-select input 1 (active-high). Must be high, along with CS2 and CS3 low, for the chip to be selected and outputs to follow the address inputs. |+| 7 | Y7 | output | Active-low decoded output 7. Drives low when address A2A1A0=111 and the chip is selected; otherwise remains high. |+| 8 | GND | power_in | Ground reference (0 V). Return for VCC supply and all logic signals. |+| 9 | Y6 | output | Active-low decoded output 6. Drives low when address A2A1A0=110 and the chip is selected; otherwise remains high. |+| 10 | Y5 | output | Active-low decoded output 5. Drives low when address A2A1A0=101 and the chip is selected; otherwise remains high. |+| 11 | Y4 | output | Active-low decoded output 4. Drives low when address A2A1A0=100 and the chip is selected; otherwise remains high. |+| 12 | Y3 | output | Active-low decoded output 3. Drives low when address A2A1A0=011 and the chip is selected; otherwise remains high. |+| 13 | Y2 | output | Active-low decoded output 2. Drives low when address A2A1A0=010 and the chip is selected; otherwise remains high. |+| 14 | Y1 | output | Active-low decoded output 1. Drives low when address A2A1A0=001 and the chip is selected; otherwise remains high. |+| 15 | Y0 | output | Active-low decoded output 0. Drives low when address A2A1A0=000 and the chip is selected; otherwise remains high. |+| 16 | VCC | power_in | Positive supply voltage, 2.0 V to 6.0 V (referenced to GND). Absolute maximum 7.0 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | onsemi |+| Package | TSSOP-16 |+| Category | Logic |+| Pins | 16 |++## Ordering variants++Same part, different packaging or reel option.++- `MC74HC138ADTR2G`+- `MC74HC138ADTR2GNLV74HC138ADTR2G`+- `MC74HC138ADTR2GDG`+- `MC74HC138ADTR2GDR2G`+- `MC74HC138ADG`+- `MC74HC138ADR2G`+- `MC74HC138ADTR2GNLV74HC138ADR2G`+- `MC74HC138ADTR2GNG`+- `MC74HC138ANG`++## CAD (KiCad official)++- Symbol: `MC74HC138ADTR2G`+- Footprint: `Package_SO:TSSOP-16_4.4x5mm_P0.65mm`+- 3D model: TSSOP-16 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/mc74hc138adtr2-d.pdf) (10 pp, sha256 `12975c730cca4e3e`, 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/mc74hc138adtr2g-datasheet.pdf)

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