component
TIP121
Public Made by Adomby adom
STMicroelectronics Darlington Transistors, TO-220-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+39@@ -0,0 +1,39 @@+# TIP121++**STMicroelectronics** · Darlington Transistors · TO-220-3++TIP121 from STMicroelectronics, in a TO-220-3. 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 | B | input | Base terminal of the monolithic NPN Darlington, with internal R1 = 7 kΩ and R2 = 70 Ω, and base current limited to 0.12 A (absolute maximum). |+| 2 | C | passive | Collector terminal, electrically connected to the metal tab; rated 80 V VCEO and 80 V VCBO for TIP121, 5 A continuous collector current and 8 A peak (ICM). |+| 3 | E | passive | Emitter terminal of the NPN Darlington; the emitter-base voltage is rated at 5 V maximum (VEBO). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | STMicroelectronics |+| Package | TO-220-3 |+| Category | Transistors/Thyristors |+| Pins | 3 |++## CAD (KiCad official)++- Symbol: `TIP121`+- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`+- 3D model: TO-220-3 (KiCad packages3D, STEP)+- 3D model files: `tip121-etched.step` / `tip121-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tip121.step` / `tip121.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590224496398397440) (13 pp, sha256 `e726b0e3ab76c110`, retrieved 2026-10-08, tier: lcsc)+- **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/tip121-datasheet.pdf)
page.jsonadded+170@@ -0,0 +1,170 @@+{+ "slug": "tip121",+ "version": "0.1.0",+ "type": "component",+ "description": "STMicroelectronics Darlington Transistors, TO-220-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",+ "tags": [+ "component",+ "transistors-thyristors",+ "tip121",+ "factory-2.0.0",+ "extractor-text"+ ],+ "dependencies": {},+ "hero": {+ "type": "image",+ "path": "docs/hero.png"+ },+ "files": [+ "page.json",+ "README.md",+ "tip121.kicad_sym",+ "tip121.kicad_mod",+ "tip121.glb",+ "tip121.step",+ "tip121.lbr",+ "docs/hero.png",+ "docs/tip121-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html",+ "tip121-hero.glb",+ "tip121-hero.overlay.json"+ ],+ "component": {+ "mpn": "TIP121",+ "manufacturer": "STMicroelectronics",+ "package": "TO-220-3",+ "pin_count": 3,+ "category": "Transistors/Thyristors",+ "subcategory": "Darlington Transistors",+ "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590224496398397440",+ "parts": {+ "symbol": "tip121.kicad_sym",+ "footprint": "tip121.kicad_mod",+ "model_3d": "tip121-hero.glb",+ "model_3d_plain": "tip121.glb",+ "model_3d_step": "tip121-etched.step",+ "model_3d_step_plain": "tip121.step",+ "lbr": "tip121.lbr"+ },+ "distributor_links": {+ "lcsc": "C315146",+ "digikey": "497-2537-5-ND",+ "mouser": "511-TIP121"+ },+ "distributor_check": {+ "checked_at": "2026-10-08T01:11:01Z",+ "source": "Component Ocean /api/assign-pns",+ "digikey": {+ "pn": "497-2537-5-ND",+ "status": "found",+ "lifecycle": "Active"+ },+ "mouser": {+ "pn": "511-TIP121",+ "status": "found"+ }+ },+ "pins": [+ {+ "number": "1",+ "name": "B",+ "type": "input",+ "description": "Base terminal of the monolithic NPN Darlington, with internal R1 = 7 kΩ and R2 = 70 Ω, and base current limited to 0.12 A (absolute maximum)."+ },+ {+ "number": "2",+ "name": "C",+ "type": "passive",+ "description": "Collector terminal, electrically connected to the metal tab; rated 80 V VCEO and 80 V VCBO for TIP121, 5 A continuous collector current and 8 A peak (ICM)."+ },+ {+ "number": "3",+ "name": "E",+ "type": "passive",+ "description": "Emitter terminal of the NPN Darlington; the emitter-base voltage is rated at 5 V maximum (VEBO)."+ }+ ],+ "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 collector is also connected to the tab (C, 2, TAB in the datasheet pinout). The package has only; The datasheet describes the TIP120/TIP121/TIP122 family in one document. The per-pin limits given fo; Pin types use KiCad classes; the datasheet does not specify ERC classes. Base is typed input and col"+ ],+ "pages_sent": 13,+ "cost_usd": 0.0381,+ "at": "2026-10-08T01:10:44"+ },+ "datasheet": {+ "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590224496398397440",+ "pages": 13,+ "sha256": "e726b0e3ab76c110",+ "source_tier": "lcsc"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 3,+ "described": 3,+ "cites_pages": true,+ "refuses_to_fabricate": true+ }+ },+ "viewers": {+ "symbol": "viewers/symbol.html",+ "footprint": "viewers/footprint.html"+ },+ "models_3d": [+ {+ "file": "tip121.step",+ "role": "plain",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "body on z = 0, through-hole leads below",+ "extents_mm": [+ 10.25,+ 4.455,+ 28.525+ ],+ "zmin_mm": -9.75,+ "centre_offset_mm": 0.932,+ "footprint_binding": "identity",+ "sha256": "7cb065d935df5771f0ba6e48ddd180863a121af76483dad7f18e667a7b68204a",+ "checked": "2026-10-08",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ },+ {+ "file": "tip121-etched.step",+ "role": "eda",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "body on z = 0, through-hole leads below",+ "extents_mm": [+ 10.25,+ 4.455,+ 28.525+ ],+ "zmin_mm": -9.75,+ "centre_offset_mm": 0.932,+ "footprint_binding": "identity",+ "sha256": "2dbbac938d96bd02bb3bd63140e1e8c32dcbff5198340ac252cd6b5f1641be94",+ "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]"+ }+}