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SN74ALS139DR
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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 @@+# SN74ALS139DR++**Texas Instruments** · Signal Switches, Multiplexers, Decoders · SOIC-16++SN74ALS139DR 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 | Active-low enable for decoder 1; when it is high, all outputs 1Y0 to 1Y3 are high regardless of the select inputs. |+| 2 | 1A | input | Select input A (least significant bit) for decoder 1; fully buffered, presenting one normalized load to its driver and Schottky-clamped. |+| 3 | 1B | input | Select input B (most significant bit) for decoder 1; fully buffered, presenting one normalized load to its driver and Schottky-clamped. |+| 4 | 1Y0 | output | Active-low output 0 of decoder 1; goes low when 1G is low and B, A are both low. |+| 5 | 1Y1 | output | Active-low output 1 of decoder 1; goes low when 1G is low and A is high with B low. |+| 6 | 1Y2 | output | Active-low output 2 of decoder 1; goes low when 1G is low and B is high with A low. |+| 7 | 1Y3 | output | Active-low output 3 of decoder 1; goes low when 1G is low and B, A are both high. |+| 8 | GND | power_in | Ground reference for the device. |+| 9 | 2Y3 | output | Active-low output 3 of decoder 2; goes low when 2G is low and B, A are both high. |+| 10 | 2Y2 | output | Active-low output 2 of decoder 2; goes low when 2G is low and B is high with A low. |+| 11 | 2Y1 | output | Active-low output 1 of decoder 2; goes low when 2G is low and A is high with B low. |+| 12 | 2Y0 | output | Active-low output 0 of decoder 2; goes low when 2G is low and B, A are both low. |+| 13 | 2B | input | Select input B (most significant bit) for decoder 2; fully buffered, presenting one normalized load to its driver and Schottky-clamped. |+| 14 | 2A | input | Select input A (least significant bit) for decoder 2; fully buffered, presenting one normalized load to its driver and Schottky-clamped. |+| 15 | 2G | input | Active-low enable for decoder 2; when it is high, all outputs 2Y0 to 2Y3 are high regardless of the select inputs. |+| 16 | VCC | power_in | Supply voltage, 4.5 V to 5.5 V recommended (5 V nominal); absolute maximum rating is 7 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-16 |+| Category | Logic |+| Pins | 16 |++## CAD (KiCad official)++- Symbol: `SN74ALS139DR`+- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`+- 3D model: SOIC-16 (KiCad packages3D, STEP)+- 3D model files: `sn74als139dr-etched.step` / `sn74als139dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74als139dr.step` / `sn74als139dr.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/sn74als139.pdf) (17 pp, sha256 `60dc2c1d0468b164`, 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/sn74als139dr-datasheet.pdf)
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when it is high, all outputs 1Y0 to 1Y3 are high regardless of the select inputs."+ },+ {+ "number": "2",+ "name": "1A",+ "type": "input",+ "description": "Select input A (least significant bit) for decoder 1; fully buffered, presenting one normalized load to its driver and Schottky-clamped."+ },+ {+ "number": "3",+ "name": "1B",+ "type": "input",+ "description": "Select input B (most significant bit) for decoder 1; fully buffered, presenting one normalized load to its driver and Schottky-clamped."+ },+ {+ "number": "4",+ "name": "1Y0",+ "type": "output",+ "description": "Active-low output 0 of decoder 1; goes low when 1G is low and B, A are both low."+ },+ {+ "number": "5",+ "name": "1Y1",+ "type": "output",+ "description": "Active-low output 1 of decoder 1; goes low when 1G is low and A is high with B low."+ },+ {+ "number": "6",+ "name": "1Y2",+ "type": "output",+ "description": "Active-low output 2 of decoder 1; goes low when 1G is low and B is high with A low."+ },+ {+ "number": "7",+ "name": "1Y3",+ "type": "output",+ "description": "Active-low output 3 of decoder 1; goes low when 1G is low and B, A are both high."+ },+ {+ "number": "8",+ "name": "GND",+ "type": "power_in",+ "description": "Ground reference for the device."+ },+ {+ "number": "9",+ "name": "2Y3",+ "type": "output",+ "description": "Active-low output 3 of decoder 2; goes low when 2G is low and B, A are both high."+ },+ {+ "number": "10",+ "name": "2Y2",+ "type": "output",+ "description": "Active-low output 2 of decoder 2; goes low when 2G is low and B is high with A low."+ },+ {+ "number": "11",+ "name": "2Y1",+ "type": "output",+ "description": "Active-low output 1 of decoder 2; goes low when 2G is low and A is high with B low."+ },+ {+ "number": "12",+ "name": "2Y0",+ "type": "output",+ "description": "Active-low output 0 of decoder 2; goes low when 2G is low and B, A are both low."+ },+ {+ "number": "13",+ "name": "2B",+ "type": "input",+ "description": "Select input B (most significant bit) for decoder 2; fully buffered, presenting one normalized load to its driver and Schottky-clamped."+ },+ {+ "number": "14",+ "name": "2A",+ "type": "input",+ "description": "Select input A (least significant bit) for decoder 2; fully buffered, presenting one normalized load to its driver and Schottky-clamped."+ },+ {+ "number": "15",+ "name": "2G",+ "type": "input",+ "description": "Active-low enable for decoder 2; when it is high, all outputs 2Y0 to 2Y3 are high regardless of the select inputs."+ },+ {+ "number": "16",+ "name": "VCC",+ "type": "power_in",+ "description": "Supply voltage, 4.5 V to 5.5 V recommended (5 V nominal); absolute maximum rating 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 D/N top-view pin numbering was reconstructed from text extraction, which lost the drawing's colu; The datasheet gives no separate pin-type classification for outputs; they are listed as output becau; The datasheet gives no electrical specs field for this package-only pinout request, so no spec value"+ ],+ "pages_sent": 17,+ "cost_usd": 0.0683,+ "at": "2026-10-08T20:26:23"+ },+ "datasheet": {+ "url": "https://www.ti.com/lit/ds/symlink/sn74als139.pdf",+ "pages": 17,+ "sha256": "60dc2c1d0468b164",+ "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": "sn74als139dr.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": "sn74als139dr-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": "47d88f00fa24b50d37e756a3f11424b683f4e610733d631e03bb28aca54563f0",+ "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]"+ }+}