component
C945
Public Made by Adomby adom
Changjing Bipolar (BJT), SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownC945
Changjing · Bipolar (BJT) · SOT-23
C945 from Changjing, in a SOT-23. 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 | BASE | input | Base terminal of the NPN transistor; the datasheet specifies VBE(sat) of 1 V at IC=100 mA with IB=10 mA and an emitter-base breakdown of 5 V minimum (VEBO 5 V maximum rating). |
| 2 | EMITTER | passive | Emitter terminal of the NPN transistor; the emitter-base voltage rating VEBO is 5 V and the absolute maximum IC is 150 mA continuous. |
| 3 | COLLECTOR | passive | Collector terminal of the NPN transistor; ratings are VCBO 60 V, VCEO 50 V, continuous IC 150 mA, and collector power dissipation PC 200 mW. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-23 |
| 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 | 60 | V | IC=100uA, IE=0 | 1 | ||
| Collector-emitter breakdown voltage | V(BR)CEO | 50 | V | IC=1mA, IB=0 | 1 | ||
| Emitter-base breakdown voltage | V(BR)EBO | 5 | V | IE=0.1mA, IC=0 | 1 | ||
| Collector cut-off current | ICBO | 0.1 | uA | VCB=60V, IE=0 | 1 | ||
| Emitter cut-off current | IEBO | 0.1 | uA | VEB=5V, IC=0 | 1 | ||
| DC current gain | hFE(1) | 130 | 400 | VCE=6V, IC=1mA | 1 | ||
| DC current gain | hFE(2) | 40 | VCE=6V, IC=0.1mA | 1 | |||
| Collector-emitter saturation voltage | VCE(sat) | 0.3 | V | IC=100mA, IB=10mA | 1 | ||
| Base-emitter saturation voltage | VBE(sat) | 1 | V | IC=100mA, IB=10mA | 1 | ||
| Transition frequency | fT | 150 | MHz | VCE=6V, IC=10mA, f=30 MHz | 1 | ||
| Collector output capacitance | Cob | 3 | pF | VCB=10V, IE=0, f=1MHZ | 1 | ||
| Noise figure | NF | 4 | 10 | dB | VCE=6V, IC=0.1mA, Rg=10kΩ, f=1kMHZ | 1 | |
| Collector-base voltage | VCBO | 60 | V | 1 | |||
| Collector-emitter voltage | VCEO | 50 | V | 1 | |||
| Emitter-base voltage | VEBO | 5 | V | 1 | |||
| Collector current, continuous | IC | 150 | mA | 1 | |||
| Collector power dissipation | PC | 200 | mW | 1 | |||
| Junction temperature | TJ | 150 | ℃ | 1 | |||
| Storage temperature | Tstg | -55 | 150 | ℃ | 1 |
CAD (KiCad official)
- Symbol:
C945 - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
c945-etched.step/c945-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);c945.step/c945.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (2 pp, sha256
8d46f71c7d0d0124, 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).