component
KTC4373
Public Made by Adomby adom
Changjing Bipolar (BJT), SOT-89-3L. 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
markdownKTC4373
Changjing · Bipolar (BJT) · SOT-89-3L
KTC4373 from Changjing, in a SOT-89-3L. 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 | NPN transistor base terminal; the datasheet's maximum ratings table lists VEBO 5 V and the emitter-base breakdown voltage is 5 V minimum at IE=1mA. |
| 2 | COLLECTOR | passive | NPN transistor collector terminal; rated for VCBO 120 V, VCEO 120 V, and collector current IC 800 mA with collector power dissipation PC 500 mW. |
| 3 | EMITTER | passive | NPN transistor emitter terminal; the emitter-base voltage rating VEBO is 5 V and the emitter cut-off current is 100 nA max at VEB=5V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-89-3L |
| 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 | 120 | V | IC= 1mA,IE=0 | 1 | ||
| Collector-emitter breakdown voltage | V(BR)CEO | 120 | V | IC=10mA,IB=0 | 1 | ||
| Emitter-base breakdown voltage | V(BR)EBO | 5 | V | IE=1mA,IC=0 | 1 | ||
| Collector cut-off current | ICBO | 100 | nA | VCB=120V,IE=0 | 1 | ||
| Emitter cut-off current | IEBO | 100 | nA | VEB=5V,IC=0 | 1 | ||
| DC current gain | hFE | 80 | 240 | VCE=5V, IC=100mA | 1 | ||
| Collector-emitter saturation voltage | VCE(sat) | 1 | V | IC=500mA,IB=50mA | 1 | ||
| Base-emitter voltage | VBE | 1 | V | VCE=5V, IC=500mA | 1 | ||
| Collector output capacitance | Cob | 30 | pF | VCB=10V,IE=0, f=1MHz | 1 | ||
| Transition frequency | fT | 120 | MHz | VCE=5V,IC= 500mA | 1 | ||
| Collector-base voltage | VCBO | 120 | V | 1 | |||
| Collector-emitter voltage | VCEO | 120 | V | 1 | |||
| Emitter-base voltage | VEBO | 5 | V | 1 | |||
| Collector current | IC | 800 | mA | 1 | |||
| Collector power dissipation | PC | 500 | mW | 1 | |||
| Junction temperature | Tj | 150 | ℃ | 1 | |||
| Storage temperature | Tstg | -55 | 150 | ℃ | 1 | ||
| Thermal resistance, junction to ambient | RθJA | 250 | ℃/W | 1 |
CAD (KiCad official)
- Symbol:
KTC4373 - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89-3L (KiCad packages3D, STEP)
- 3D model files:
ktc4373-etched.step/ktc4373-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ktc4373.step/ktc4373.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (1 pp, sha256
fb7b61e01e4397b3, 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).