component
BC639
Public Made by Adomby adom
Changjing Bipolar (BJT), TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
README
markdownBC639
Changjing · Bipolar (BJT) · TO-92
BC639 from Changjing, in a TO-92. 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 | EMITTER | passive | Emitter of the NPN transistor; emitter-base voltage is limited to 5 V (VEBO) and emitter cut-off current is 0.1 µA max at VEB = 5 V. |
| 2 | COLLECTOR | passive | Collector of the NPN transistor; continuous collector current is limited to 1 A and collector-emitter voltage to 45 V (BC635), 60 V (BC637) or 80 V (BC639) VCEO, with total power dissipation of 0.83 W. |
| 3 | BASE | passive | Base of the NPN transistor; the datasheet specifies VBE of 1 V max at VCE = 2 V and IC = 500 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | TO-92 |
| Category | Transistors/Thyristors |
| Pins | 3 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Collector-Emitter Voltage (VCBO row, BC639) | VCBO | 100 | V | 1 | |||
| Collector-Emitter Voltage (VCEO row, BC639) | VCEO | 80 | V | 1 | |||
| Emitter-Base Voltage | VEBO | 5 | V | 1 | |||
| Collector Current -Continuous | IC | 1 | A | 1 | |||
| Collector Power Dissipation | PC | 0.83 | W | 1 | |||
| Operation Junction and Storage Temperature Range | TJ,Tstg | -55 | 150 | ℃ | 1 | ||
| Collector-emitter breakdown voltage | V(BR)CEO | 80 | V | IC=10mA, IB=0 | 2 | ||
| Collector cut-off current | ICBO | 0.1 | μA | VCB= 30 V, IE=0 | 2 | ||
| Emitter cut-off current | IEBO | 0.1 | μA | VEB=5V, IB=0 | 2 | ||
| DC current gain hFE(1) | hFE(1) | 25 | VCE=2 V, IC= 5mA | 2 | |||
| DC current gain hFE(3) | hFE(3) | 25 | VCE=2V, IC= 500mA | 2 | |||
| Collector-emitter saturation voltage | VCE(sat) | 0.5 | V | IC=500mA, IB=50mA | 2 | ||
| Base-emitter voltage | VBE | 1 | V | VCE=2V, IC=500mA | 2 | ||
| Transition frequency | fT | 100 | MHz | VCE=5V, IC=10mA, f=50 MHZ | 2 |
CAD (KiCad official)
- Symbol:
BC639 - Footprint:
Package_TO_SOT_THT:TO-92_Inline - 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files:
bc639-etched.step/bc639-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bc639.step/bc639.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (5 pp, sha256
52e4f6f4f4a84afe, retrieved 2026-10-17, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).