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TIP127 PNP Darlington Transistor
Public Unreviewedby Ray
PNP Darlington power transistor, -100 V / 5 A, high current gain in TO-220.
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markdownTIP127
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 (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).