TIP127 PNP Darlington Transistor

@@ -0,0 +1,40 @@+# TIP127++**STMicroelectronics** · Bipolar Transistor (BJT) · TO-220++The TIP127 is a PNP Darlington power transistor rated for -100 V and 5 A continuous collector current. Its Darlington pair gives high current gain, so a small base drive from an MCU or logic pin switches large loads. It comes in a TO-220 package with integrated base-emitter resistors, part of the TIP120-127 complementary series.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | B | input | Base of the PNP Darlington pair. Drive with negative base current (IB max 0.12 A) referenced to the emitter; VBE(on) typ 2.5 V at IC = 3 A. Internal 16 kΩ base-emitter resistor (R1) is present. |+| 2 | C | passive | Collector of the PNP Darlington and electrically common with the TO-220 metal TAB. VCBO / VCEO absolute max = 100 V, IC = 5 A continuous, ICM = 8 A peak. TAB is typically bolted to the heatsink and must be isolated if the heatsink is not at collector potential. |+| 3 | E | passive | Emitter of the PNP Darlington pair, the current-return terminal. For PNP operation this pin is the positive supply reference relative to the collector; all voltage/current values are negative per the datasheet note. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | PNP Darlington power transistor |+| Collector-emitter voltage (VCEO) | -100 V |+| Collector current (IC) | 5 A continuous (8 A peak) |+| DC current gain (hFE) | 1000 min at 3 A |+| Power dissipation | 65 W |+| Operating temperature | -65 C to 150 C |++## CAD (KiCad official)++- Symbol: `tip127.kicad_sym`+- Footprint: `tip127.kicad_mod`+- 3D model: TO-220 body from KiCad `Package_TO_SOT_THT/TO-220-3_Vertical`.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/tip120.pdf) (13 pp, sha256 `e726b0e3ab76c110`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/tip127-datasheet.pdf)

@@ -0,0 +1,36 @@+{+  "slug": "tip127",+  "version": "0.1.0",+  "type": "component",+  "description": "PNP Darlington power transistor, -100 V / 5 A, high current gain in TO-220.",+  "tags": [+    "transistor",+    "darlington",+    "pnp",+    "power",+    "to-220",+    "st"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "tip127.kicad_sym",+    "tip127.kicad_mod",+    "tip127.glb",+    "tip127.step",+    "docs/hero.png",+    "docs/tip127-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file