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SN74HC253DBR
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Texas Instruments Signal Switches, Multiplexers, Decoders, SSOP-16-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+53@@ -0,0 +1,53 @@+# SN74HC253DBR++**Texas Instruments** · Signal Switches, Multiplexers, Decoders · SSOP-16-208mil++SN74HC253DBR from Texas Instruments, in a SSOP-16-208mil. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | 1OE | input | Active-low output enable for section 1; outputs 1Y high-impedance when 1OE is high. |+| 2 | B | input | Select input B (MSB), common to both multiplexer sections. |+| 3 | 1C3 | input | Data input 3 of section 1 multiplexer. |+| 4 | 1C2 | input | Data input 2 of section 1 multiplexer. |+| 5 | 1C1 | input | Data input 1 of section 1 multiplexer. |+| 6 | 1C0 | input | Data input 0 of section 1 multiplexer. |+| 7 | 1Y | tri_state | Three-state output of section 1 multiplexer, high-impedance when 1OE is high. |+| 8 | GND | power_in | Ground. |+| 9 | 2Y | tri_state | Three-state output of section 2 multiplexer, high-impedance when 2OE is high. |+| 10 | 2C0 | input | Data input 0 of section 2 multiplexer. |+| 11 | 2C1 | input | Data input 1 of section 2 multiplexer. |+| 12 | 2C2 | input | Data input 2 of section 2 multiplexer. |+| 13 | 2C3 | input | Data input 3 of section 2 multiplexer. |+| 14 | A | input | Select input A (LSB), common to both multiplexer sections. |+| 15 | 2OE | input | Active-low output enable for section 2; outputs 2Y high-impedance when 2OE is high. |+| 16 | VCC | power_in | Supply voltage, 2 V to 6 V recommended, with a 0.1-µF bypass capacitor recommended close to the pin. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SSOP-16-208mil |+| Category | Logic |+| Pins | 16 |++## CAD (KiCad official)++- Symbol: `SN74HC253DBR`+- Footprint: `Package_SO:SSOP-16_5.3x6.2mm_P0.65mm`+- 3D model: SSOP-16-208mil (KiCad packages3D, STEP)+- 3D model files: `sn74hc253dbr-etched.step` / `sn74hc253dbr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74hc253dbr.step` / `sn74hc253dbr.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/sn74hc253) (29 pp, sha256 `ffababeb788ab721`, retrieved 2026-10-01, 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:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/sn74hc253dbr-datasheet.pdf)
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