component
SN74HCT138DR
Public Made by Adomby adom
Texas Instruments Signal Switches, Multiplexers, Decoders, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
← Commit history
README.mdadded+52@@ -0,0 +1,52 @@+# SN74HCT138DR++**Texas Instruments** · Signal Switches, Multiplexers, Decoders · SOIC-16++SN74HCT138DR from Texas Instruments, 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 | A | input | Binary address select input A (LSB); TTL-compatible with VIH ≥ 2 V and VIL ≤ 0.8 V at VCC = 4.5 V to 5.5 V; selects one of eight outputs in combination with B and C. |+| 2 | B | input | Binary address select input B (middle bit); TTL-compatible with VIH ≥ 2 V and VIL ≤ 0.8 V at VCC = 4.5 V to 5.5 V. |+| 3 | C | input | Binary address select input C (MSB); TTL-compatible with VIH ≥ 2 V and VIL ≤ 0.8 V at VCC = 4.5 V to 5.5 V. |+| 4 | ~{G2A} | input | Active-low enable input G2A; all outputs forced high when this pin is high; must be low together with ~G2B and G1 high to enable the decoder; VIH ≥ 2 V, VIL ≤ 0.8 V, IImax = 1 µA. |+| 5 | ~{G2B} | input | Active-low enable input G2B; all outputs forced high when this pin is high; must be low together with ~G2A and G1 high to enable the decoder; VIH ≥ 2 V, VIL ≤ 0.8 V, IImax = 1 µA. |+| 6 | G1 | input | Active-high enable input; all outputs forced high when G1 is low; must be high together with ~G2A and ~G2B both low to enable the decoder; VIH ≥ 2 V, VIL ≤ 0.8 V, IImax = 1 µA. |+| 7 | Y7 | output | Active-low decoded output 7; asserted low when G1=H, ~G2A=L, ~G2B=L and CBA=111; VOH ≥ 3.84 V at IOH = -4 mA, VOL ≤ 0.33 V at IOL = 4 mA, tpd ≤ 45 ns at VCC = 4.5 V. |+| 8 | GND | power_in | Ground reference (0 V); continuous current through GND pin must not exceed ±50 mA. |+| 9 | Y6 | output | Active-low decoded output 6; asserted low when G1=H, ~G2A=L, ~G2B=L and CBA=110; VOH ≥ 3.84 V at IOH = -4 mA, VOL ≤ 0.33 V at IOL = 4 mA, tpd ≤ 45 ns at VCC = 4.5 V. |+| 10 | Y5 | output | Active-low decoded output 5; asserted low when G1=H, ~G2A=L, ~G2B=L and CBA=101; VOH ≥ 3.84 V at IOH = -4 mA, VOL ≤ 0.33 V at IOL = 4 mA, tpd ≤ 45 ns at VCC = 4.5 V. |+| 11 | Y4 | output | Active-low decoded output 4; asserted low when G1=H, ~G2A=L, ~G2B=L and CBA=100; VOH ≥ 3.84 V at IOH = -4 mA, VOL ≤ 0.33 V at IOL = 4 mA, tpd ≤ 45 ns at VCC = 4.5 V. |+| 12 | Y3 | output | Active-low decoded output 3; asserted low when G1=H, ~G2A=L, ~G2B=L and CBA=011; VOH ≥ 3.84 V at IOH = -4 mA, VOL ≤ 0.33 V at IOL = 4 mA, tpd ≤ 45 ns at VCC = 4.5 V. |+| 13 | Y2 | output | Active-low decoded output 2; asserted low when G1=H, ~G2A=L, ~G2B=L and CBA=010; VOH ≥ 3.84 V at IOH = -4 mA, VOL ≤ 0.33 V at IOL = 4 mA, tpd ≤ 45 ns at VCC = 4.5 V. |+| 14 | Y1 | output | Active-low decoded output 1; asserted low when G1=H, ~G2A=L, ~G2B=L and CBA=001; VOH ≥ 3.84 V at IOH = -4 mA, VOL ≤ 0.33 V at IOL = 4 mA, tpd ≤ 45 ns at VCC = 4.5 V. |+| 15 | Y0 | output | Active-low decoded output 0; asserted low when G1=H, ~G2A=L, ~G2B=L and CBA=000; VOH ≥ 3.84 V at IOH = -4 mA, VOL ≤ 0.33 V at IOL = 4 mA, tpd ≤ 45 ns at VCC = 4.5 V. |+| 16 | VCC | power_in | Positive supply voltage; recommended operating range 4.5 V to 5.5 V; absolute maximum 7 V; each VCC pin should be bypassed with a 0.1 µF capacitor; continuous current ±50 mA max. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-16 |+| Category | Logic |+| Pins | 16 |++## CAD (KiCad official)++- Symbol: `SN74HCT138DR`+- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`+- 3D model: SOIC-16 (KiCad packages3D, STEP)+- 3D model files: `sn74hct138dr-etched.step` / `sn74hct138dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74hct138dr.step` / `sn74hct138dr.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/sn74hct138.pdf) (28 pp, sha256 `0d754c91dca77706`, retrieved 2026-09-18, tier: manufacturer)+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-sonnet-4-6` (text+vision), consensus `claude-opus-4-7` (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/sn74hct138dr-datasheet.pdf)
page.jsonadded+191@@ -0,0 +1,191 @@+{+ "slug": "sn74hct138dr",+ "version": "0.1.0",+ "type": "component",+ "description": "Texas Instruments Signal Switches, Multiplexers, Decoders, SOIC-16. Datasheet-verified pinout, KiCad symbol/footprint/3D.",+ "tags": [+ "component",+ "logic",+ "sn74hct138dr",+ "factory-2.0.0",+ "extractor-text"+ ],+ "dependencies": {},+ "hero": {+ "type": "image",+ "path": "docs/hero.png"+ },+ "files": [+ "page.json",+ "README.md",+ "sn74hct138dr.kicad_sym",+ "sn74hct138dr.kicad_mod",+ "sn74hct138dr.glb",+ "sn74hct138dr.step",+ "sn74hct138dr.lbr",+ "docs/hero.png",+ "docs/sn74hct138dr-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html"+ ],+ "component": {+ "mpn": "SN74HCT138DR",+ "manufacturer": "Texas Instruments",+ "package": "SOIC-16",+ "pin_count": 16,+ "category": "Logic",+ "subcategory": "Signal Switches, Multiplexers, Decoders",+ "datasheet": "https://www.ti.com/lit/ds/symlink/sn74hct138.pdf",+ "parts": {+ "symbol": "sn74hct138dr.kicad_sym",+ "footprint": "sn74hct138dr.kicad_mod",+ "model_3d": "sn74hct138dr-etched.glb",+ "model_3d_plain": "sn74hct138dr.glb",+ "model_3d_step": "sn74hct138dr-etched.step",+ "model_3d_step_plain": "sn74hct138dr.step",+ "lbr": "sn74hct138dr.lbr"+ },+ "distributor_links": {+ "lcsc": "C352958"+ },+ "pins": [+ {+ "number": "1",+ "name": "A",+ "type": "input",+ "description": "Binary address select input A (LSB); TTL-compatible with VIH ≥ 2 V and VIL ≤ 0.8 V at VCC = 4.5 V to 5.5 V; selects one of eight outputs in combination with B and C."+ },+ {+ "number": "2",+ "name": "B",+ "type": "input",+ "description": "Binary address select input B (middle bit); TTL-compatible with VIH ≥ 2 V and VIL ≤ 0.8 V at VCC = 4.5 V to 5.5 V."+ },+ {+ "number": "3",+ "name": "C",+ "type": "input",+ "description": "Binary address select input C (MSB); TTL-compatible with VIH ≥ 2 V and VIL ≤ 0.8 V at VCC = 4.5 V to 5.5 V."+ },+ {+ "number": "4",+ "name": "~{G2A}",+ "type": "input",+ "description": "Active-low enable input G2A; all outputs forced high when this pin is high; must be low together with ~G2B and G1 high to enable the decoder; VIH ≥ 2 V, VIL ≤ 0.8 V, IImax = 1 µA."+ },+ {+ "number": "5",+ "name": "~{G2B}",+ "type": "input",+ "description": "Active-low enable input G2B; all outputs forced high when this pin is high; must be low together with ~G2A and G1 high to enable the decoder; VIH ≥ 2 V, VIL ≤ 0.8 V, IImax = 1 µA."+ },+ {+ "number": "6",+ "name": "G1",+ "type": "input",+ "description": "Active-high enable input; all outputs forced high when G1 is low; must be high together with ~G2A and ~G2B both low to enable the decoder; VIH ≥ 2 V, VIL ≤ 0.8 V, IImax = 1 µA."+ },+ {+ "number": "7",+ "name": "Y7",+ "type": "output",+ "description": "Active-low decoded output 7; asserted low when G1=H, ~G2A=L, ~G2B=L and CBA=111; VOH ≥ 3.84 V at IOH = -4 mA, VOL ≤ 0.33 V at IOL = 4 mA, tpd ≤ 45 ns at VCC = 4.5 V."+ },+ {+ "number": "8",+ "name": "GND",+ "type": "power_in",+ "description": "Ground reference (0 V); continuous current through GND pin must not exceed ±50 mA."+ },+ {+ "number": "9",+ "name": "Y6",+ "type": "output",+ "description": "Active-low decoded output 6; asserted low when G1=H, ~G2A=L, ~G2B=L and CBA=110; VOH ≥ 3.84 V at IOH = -4 mA, VOL ≤ 0.33 V at IOL = 4 mA, tpd ≤ 45 ns at VCC = 4.5 V."+ },+ {+ "number": "10",+ "name": "Y5",+ "type": "output",+ "description": "Active-low decoded output 5; asserted low when G1=H, ~G2A=L, ~G2B=L and CBA=101; VOH ≥ 3.84 V at IOH = -4 mA, VOL ≤ 0.33 V at IOL = 4 mA, tpd ≤ 45 ns at VCC = 4.5 V."+ },+ {+ "number": "11",+ "name": "Y4",+ "type": "output",+ "description": "Active-low decoded output 4; asserted low when G1=H, ~G2A=L, ~G2B=L and CBA=100; VOH ≥ 3.84 V at IOH = -4 mA, VOL ≤ 0.33 V at IOL = 4 mA, tpd ≤ 45 ns at VCC = 4.5 V."+ },+ {+ "number": "12",+ "name": "Y3",+ "type": "output",+ "description": "Active-low decoded output 3; asserted low when G1=H, ~G2A=L, ~G2B=L and CBA=011; VOH ≥ 3.84 V at IOH = -4 mA, VOL ≤ 0.33 V at IOL = 4 mA, tpd ≤ 45 ns at VCC = 4.5 V."+ },+ {+ "number": "13",+ "name": "Y2",+ "type": "output",+ "description": "Active-low decoded output 2; asserted low when G1=H, ~G2A=L, ~G2B=L and CBA=010; VOH ≥ 3.84 V at IOH = -4 mA, VOL ≤ 0.33 V at IOL = 4 mA, tpd ≤ 45 ns at VCC = 4.5 V."+ },+ {+ "number": "14",+ "name": "Y1",+ "type": "output",+ "description": "Active-low decoded output 1; asserted low when G1=H, ~G2A=L, ~G2B=L and CBA=001; VOH ≥ 3.84 V at IOH = -4 mA, VOL ≤ 0.33 V at IOL = 4 mA, tpd ≤ 45 ns at VCC = 4.5 V."+ },+ {+ "number": "15",+ "name": "Y0",+ "type": "output",+ "description": "Active-low decoded output 0; asserted low when G1=H, ~G2A=L, ~G2B=L and CBA=000; VOH ≥ 3.84 V at IOH = -4 mA, VOL ≤ 0.33 V at IOL = 4 mA, tpd ≤ 45 ns at VCC = 4.5 V."+ },+ {+ "number": "16",+ "name": "VCC",+ "type": "power_in",+ "description": "Positive supply voltage; recommended operating range 4.5 V to 5.5 V; absolute maximum 7 V; each VCC pin should be bypassed with a 0.1 µF capacitor; continuous current ±50 mA max."+ }+ ],+ "provenance": {+ "extractor": "extract_pins 0.2",+ "factory_chain": {+ "factory": "2.0.0",+ "extractor": "extract_pins 0.2",+ "primary_model": "claude-sonnet-4-6",+ "primary_mode": "text+vision",+ "consensus_model": "claude-opus-4-7",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [+ "vision extraction: provenance cannot be text-verified; needs consensus"+ ],+ "pages_sent": 28,+ "cost_usd": 0.5742,+ "at": "2026-09-18T00:59:58"+ },+ "datasheet": {+ "url": "https://www.ti.com/lit/ds/symlink/sn74hct138.pdf",+ "pages": 28,+ "sha256": "0d754c91dca77706",+ "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"+ }+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}