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SN74F253DR
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Texas Instruments Signal Switches, Multiplexers, Decoders, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+52@@ -0,0 +1,52 @@+# SN74F253DR++**Texas Instruments** · Signal Switches, Multiplexers, Decoders · SOIC-16++SN74F253DR from Texas Instruments, in a SOIC-16. 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 | 1G | input | Strobe input for the first 4-line section; the 1Y output is disabled (high impedance) when this input is high. |+| 2 | B | input | Select input B, common to both 4-line sections, that together with A chooses which data input is routed to the outputs. |+| 3 | 1C3 | input | Data input 3 of the first 4-line section, selected when A and B are both high. |+| 4 | 1C2 | input | Data input 2 of the first 4-line section, selected when B is high and A is low. |+| 5 | 1C1 | input | Data input 1 of the first 4-line section, selected when A is high and B is low. |+| 6 | 1C0 | input | Data input 0 of the first 4-line section, selected when A and B are both low. |+| 7 | 1Y | tri_state | 3-state output of the first 4-line section; drives the bus at a low or high logic level when enabled and is high impedance when 1G is high. |+| 8 | GND | power_in | Ground pin of the device. |+| 9 | 2Y | tri_state | 3-state output of the second 4-line section; drives the bus at a low or high logic level when enabled and is high impedance when 2G is high. |+| 10 | 2C0 | input | Data input 0 of the second 4-line section, selected when A and B are both low. |+| 11 | 2C1 | input | Data input 1 of the second 4-line section, selected when A is high and B is low. |+| 12 | 2C2 | input | Data input 2 of the second 4-line section, selected when B is high and A is low. |+| 13 | 2C3 | input | Data input 3 of the second 4-line section, selected when A and B are both high. |+| 14 | A | input | Select input A, common to both 4-line sections, that together with B chooses which data input is routed to the outputs. |+| 15 | 2G | input | Strobe input for the second 4-line section; the 2Y output is disabled (high impedance) when this input is high. |+| 16 | VCC | power_in | Supply pin; recommended supply voltage is 4.5 V to 5.5 V (5 V nominal) and absolute maximum is 7 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-16 |+| Category | Logic |+| Pins | 16 |++## CAD (KiCad official)++- Symbol: `SN74F253DR`+- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`+- 3D model: SOIC-16 (KiCad packages3D, STEP)+- 3D model files: `sn74f253dr-etched.step` / `sn74f253dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74f253dr.step` / `sn74f253dr.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/lit/ds/symlink/sn74f253.pdf) (13 pp, sha256 `a8da140d625fbea2`, retrieved 2026-10-08, tier: manufacturer)+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/sn74f253dr-datasheet.pdf)
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the 1Y output is disabled (high impedance) when this input is high."+ },+ {+ "number": "2",+ "name": "B",+ "type": "input",+ "description": "Select input B, common to both 4-line sections, that together with A chooses which data input is routed to the outputs."+ },+ {+ "number": "3",+ "name": "1C3",+ "type": "input",+ "description": "Data input 3 of the first 4-line section, selected when A and B are both high."+ },+ {+ "number": "4",+ "name": "1C2",+ "type": "input",+ "description": "Data input 2 of the first 4-line section, selected when B is high and A is low."+ },+ {+ "number": "5",+ "name": "1C1",+ "type": "input",+ "description": "Data input 1 of the first 4-line section, selected when A is high and B is low."+ },+ {+ "number": "6",+ "name": "1C0",+ "type": "input",+ "description": "Data input 0 of the first 4-line section, selected when A and B are both low."+ },+ {+ "number": "7",+ "name": "1Y",+ "type": "tri_state",+ "description": "3-state output of the first 4-line section; drives the bus at a low or high logic level when enabled and is high impedance when 1G is high."+ },+ {+ "number": "8",+ "name": "GND",+ "type": "power_in",+ "description": "Ground pin of the device."+ },+ {+ "number": "9",+ "name": "2Y",+ "type": "tri_state",+ "description": "3-state output of the second 4-line section; drives the bus at a low or high logic level when enabled and is high impedance when 2G is high."+ },+ {+ "number": "10",+ "name": "2C0",+ "type": "input",+ "description": "Data input 0 of the second 4-line section, selected when A and B are both low."+ },+ {+ "number": "11",+ "name": "2C1",+ "type": "input",+ "description": "Data input 1 of the second 4-line section, selected when A is high and B is low."+ },+ {+ "number": "12",+ "name": "2C2",+ "type": "input",+ "description": "Data input 2 of the second 4-line section, selected when B is high and A is low."+ },+ {+ "number": "13",+ "name": "2C3",+ "type": "input",+ "description": "Data input 3 of the second 4-line section, selected when A and B are both high."+ },+ {+ "number": "14",+ "name": "A",+ "type": "input",+ "description": "Select input A, common to both 4-line sections, that together with B chooses which data input is routed to the outputs."+ },+ {+ "number": "15",+ "name": "2G",+ "type": "input",+ "description": "Strobe input for the second 4-line section; the 2Y output is disabled (high impedance) when this input is high."+ },+ {+ "number": "16",+ "name": "VCC",+ "type": "power_in",+ "description": "Supply pin; recommended supply voltage is 4.5 V to 5.5 V (5 V nominal) and absolute maximum is 7 V."+ }+ ],+ "provenance": {+ "extractor": "extract_pins 0.3",+ "factory_chain": {+ "factory": "2.0.0",+ "extractor": "extract_pins 0.3",+ "primary_model": "claude-haiku-5-5",+ "primary_mode": "text",+ "consensus_model": "claude-sonnet-5-5",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [+ "extractor flagged: The datasheet covers the SN54F253/SN74F253 family and gives one 16-pin top-view pinout for the D (SO; Pin-to-function mapping for the select and data inputs (which C input is chosen for each A/B combina; The datasheet states no separate electrical limit for the GND pin, so its description is limited to "+ ],+ "pages_sent": 13,+ "cost_usd": 0.0554,+ "at": "2026-10-08T16:05:02"+ },+ "datasheet": {+ "url": "https://www.ti.com/lit/ds/symlink/sn74f253.pdf",+ "pages": 13,+ "sha256": "a8da140d625fbea2",+ "source_tier": "mfr"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 16,+ "described": 16,+ "cites_pages": true,+ "refuses_to_fabricate": true+ }+ },+ "viewers": {+ "symbol": "viewers/symbol.html",+ "footprint": "viewers/footprint.html"+ },+ "models_3d": [+ {+ "file": "sn74f253dr.step",+ "role": "plain",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 6,+ 9.9,+ 1.75+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",+ "checked": "2026-10-08",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ },+ {+ "file": "sn74f253dr-etched.step",+ "role": "eda",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 6,+ 9.9,+ 1.75+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "17996df885d07c8c738fce25c510e0bff2020d6252218910261a06031b33bf01",+ "checked": "2026-10-08",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ }+ ]+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}