74hc237d

@@ -0,0 +1,56 @@+# 74HC237D++**Nexperia** · Signal Switches / Encoders & Decoders / Multiplexers · SOIC-16++74HC237D from Nexperia, 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 | A0 | input | Address/data input bit 0 to the 3-bit input latch feeding the 3-to-8 decoder. CMOS-level input; VIH ≥ 3.15 V at VCC = 4.5 V, VIL ≤ 1.35 V. |+| 2 | A1 | input | Address/data input bit 1 to the 3-bit input latch feeding the 3-to-8 decoder. CMOS-level input; VIH ≥ 3.15 V at VCC = 4.5 V. |+| 3 | A2 | input | Address/data input bit 2 to the 3-bit input latch feeding the 3-to-8 decoder. CMOS-level input; VIH ≥ 3.15 V at VCC = 4.5 V. |+| 4 | LE | input | Latch enable input (active LOW). When LE = LOW the latches are transparent and outputs follow A0..A2; on LOW-to-HIGH transition, the address is stored and further address changes are ignored while LE is HIGH. |+| 5 | E1 | input | Data (output) enable input 1, active LOW. All Yn outputs are forced LOW unless E1 = LOW AND E2 = HIGH. |+| 6 | E2 | input | Data (output) enable input 2, active HIGH. All Yn outputs are forced LOW unless E1 = LOW AND E2 = HIGH. |+| 7 | Y7 | output | Decoded active-HIGH output line 7 (asserted when latched address A2:A0 = 111 and outputs are enabled). Push-pull CMOS output; IO up to ±25 mA absolute max, VOH ≥ 3.98 V at IO = -4 mA and VCC = 4.5 V. |+| 8 | GND | power_in | Ground reference (0 V). Return for VCC supply and all signals. |+| 9 | Y6 | output | Decoded active-HIGH output line 6 (asserted when latched address A2:A0 = 110 and outputs are enabled). Push-pull CMOS output. |+| 10 | Y5 | output | Decoded active-HIGH output line 5 (asserted when latched address A2:A0 = 101 and outputs are enabled). Push-pull CMOS output. |+| 11 | Y4 | output | Decoded active-HIGH output line 4 (asserted when latched address A2:A0 = 100 and outputs are enabled). Push-pull CMOS output. |+| 12 | Y3 | output | Decoded active-HIGH output line 3 (asserted when latched address A2:A0 = 011 and outputs are enabled). Push-pull CMOS output. |+| 13 | Y2 | output | Decoded active-HIGH output line 2 (asserted when latched address A2:A0 = 010 and outputs are enabled). Push-pull CMOS output. |+| 14 | Y1 | output | Decoded active-HIGH output line 1 (asserted when latched address A2:A0 = 001 and outputs are enabled). Push-pull CMOS output. |+| 15 | Y0 | output | Decoded active-HIGH output line 0 (asserted when latched address A2:A0 = 000 and outputs are enabled). Push-pull CMOS output. |+| 16 | VCC | power_in | Positive supply voltage. Recommended operating range 2.0 V to 6.0 V (typ 5.0 V); absolute maximum -0.5 V to +7 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Nexperia |+| Package | SOIC-16 |+| Category | Logic |+| Pins | 16 |++## Ordering variants++- `74HC237DD`+- `74HC237DPW`++## CAD (KiCad official)++- Symbol: `74HC237D`+- 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:** [Nexperia datasheet](https://assets.nexperia.com/documents/data-sheet/74HC237D.pdf) (None pp, sha256 `a9d2400e7a0d9e8a`, 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/74hc237d-datasheet.pdf)

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