TIP122 NPN Darlington Transistor

@@ -0,0 +1,40 @@+# TIP122++**STMicroelectronics** · Bipolar Transistor (BJT) · TO-220++The TIP122 is a NPN 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 Darlington pair. Drive with IB up to 120 mA (absolute max); VBE(on) ≈ 2.5 V at IC = 3 A. Internal 7 kΩ resistor R1 sits between B and E, and R2 = 70 Ω is in series with the output-transistor base. |+| 2 | C | passive | Collector of the Darlington pair; also electrically connected to the TAB (heatsink mounting tab) for thermal dissipation. Rated VCEO = 100 V, IC = 5 A DC / 8 A peak. |+| 3 | E | passive | Emitter of the Darlington pair. Typically returned to the load's low-side rail (ground) in switching applications. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | NPN 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: `tip122.kicad_sym`+- Footprint: `tip122.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/tip122-datasheet.pdf)

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