component
BF423-TA
Public Made by Adomby adom
Changjing Bipolar (BJT), TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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BF423-TA
Changjing · Bipolar (BJT) · TO-92
BF423-TA 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 PNP transistor; the emitter-base breakdown voltage V(BR)EBO is -5 V at IE=-100μA. |
| 2 | COLLECTOR | passive | Collector of the PNP transistor; for BF423 the datasheet rates VCBO and VCEO at -250 V, IC at -100 mA continuous, and PC at 0.83 W. |
| 3 | BASE | passive | Base of the PNP transistor; DC current gain hFE is specified as 50 at VCE=-20 V, IC=-25 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-base breakdown voltage | V(BR)CBO | -250 | V | IC=--100μA, IE=0 (BF423 column) | 2 | ||
| Collector-emitter breakdown voltage | V(BR)CEO | -250 | V | IC= -1mA, IB=0 (BF423 column) | 2 | ||
| Emitter-base breakdown voltage | V(BR)EBO | -5 | V | IE=-100μA, IC=0 | 2 | ||
| Collector cut-off current | ICBO | -0.01 | μA | VCB=-200 V, IE=0 | 2 | ||
| Emitter cut-off current (BF423) | IEBO | -0.05 | μA | VEB=-5V, IC=0 | 2 | ||
| DC current gain | hFE | 50 | VCE=-20V, IC=-25mA | 2 | |||
| Collector-emitter saturation voltage (BF423) | VCE(sat) | -0.6 | V | IC=-20mA, IB=-2mA; IC=-30mA, IB=-5mA | 2 | ||
| Transition frequency | fT | 60 | MHz | VCE=-10V, IC=-10mA, f = 100MHz | 2 | ||
| Feedback capacitance | Cre | 1.6 | pF | VCE=-30V, IC=0, f=1MHz | 2 | ||
| Collector-Base Voltage (BF423) | VCBO | -250 | V | 1 | |||
| Collector-Emitter Voltage (BF423) | VCEO | -250 | V | 1 | |||
| Emitter-Base Voltage | VEBO | -5 | V | 1 | |||
| Collector Current -Continuous | IC | -100 | mA | 1 | |||
| Collector Power Dissipation | PC | 0.83 | W | 1 | |||
| Operation Junction and Storage Temperature Range | TJ,Tstg | -55 | 150 | ℃ | 1 | ||
| Thermal resistance from junction to ambient | Rthja | 151 | ℃/W | 1 |
CAD (KiCad official)
- Symbol:
BF423-TA - Footprint:
Package_TO_SOT_THT:TO-92_Inline - 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files:
bf423-ta-etched.step/bf423-ta-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bf423-ta.step/bf423-ta.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (4 pp, sha256
af28e91c502a53a2, retrieved 2026-10-19, 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).
# BF423-TA
**Changjing** · Bipolar (BJT) · TO-92
BF423-TA 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 PNP transistor; the emitter-base breakdown voltage V(BR)EBO is -5 V at IE=-100μA. |
| 2 | COLLECTOR | passive | Collector of the PNP transistor; for BF423 the datasheet rates VCBO and VCEO at -250 V, IC at -100 mA continuous, and PC at 0.83 W. |
| 3 | BASE | passive | Base of the PNP transistor; DC current gain hFE is specified as 50 at VCE=-20 V, IC=-25 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-base breakdown voltage | V(BR)CBO | -250 | | | V | IC=--100μA, IE=0 (BF423 column) | 2 |
| Collector-emitter breakdown voltage | V(BR)CEO | -250 | | | V | IC= -1mA, IB=0 (BF423 column) | 2 |
| Emitter-base breakdown voltage | V(BR)EBO | -5 | | | V | IE=-100μA, IC=0 | 2 |
| Collector cut-off current | ICBO | | | -0.01 | μA | VCB=-200 V, IE=0 | 2 |
| Emitter cut-off current (BF423) | IEBO | | | -0.05 | μA | VEB=-5V, IC=0 | 2 |
| DC current gain | hFE | 50 | | | | VCE=-20V, IC=-25mA | 2 |
| Collector-emitter saturation voltage (BF423) | VCE(sat) | | | -0.6 | V | IC=-20mA, IB=-2mA; IC=-30mA, IB=-5mA | 2 |
| Transition frequency | fT | 60 | | | MHz | VCE=-10V, IC=-10mA, f = 100MHz | 2 |
| Feedback capacitance | Cre | | | 1.6 | pF | VCE=-30V, IC=0, f=1MHz | 2 |
| Collector-Base Voltage (BF423) | VCBO | -250 | | | V | | 1 |
| Collector-Emitter Voltage (BF423) | VCEO | -250 | | | V | | 1 |
| Emitter-Base Voltage | VEBO | -5 | | | V | | 1 |
| Collector Current -Continuous | IC | -100 | | | mA | | 1 |
| Collector Power Dissipation | PC | | | 0.83 | W | | 1 |
| Operation Junction and Storage Temperature Range | TJ,Tstg | -55 | | 150 | ℃ | | 1 |
| Thermal resistance from junction to ambient | Rthja | | 151 | | ℃/W | | 1 |
## CAD (KiCad official)
- Symbol: `BF423-TA`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files: `bf423-ta-etched.step` / `bf423-ta-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bf423-ta.step` / `bf423-ta.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590229261954019328) (4 pp, sha256 `af28e91c502a53a2`, retrieved 2026-10-19, 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/bf423-ta-datasheet.pdf)