component
2SC4738
Public Made by Adomby adom
Changjing Bipolar (BJT), SOT-523. 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
markdown2SC4738
Changjing · Bipolar (BJT) · SOT-523
2SC4738 from Changjing, in a SOT-523. 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 gives emitter-base breakdown V(BR)EBO of 5 V minimum at IE=100µA and a VEBO rating of 5 V. |
| 2 | EMITTER | passive | Emitter terminal of the NPN transistor; the datasheet gives an emitter-base voltage rating VEBO of 5 V and an emitter cut-off current IEBO of 100 nA max at VEB=5V. |
| 3 | COLLECTOR | passive | Collector terminal of the NPN transistor; the datasheet rates it for VCBO 60 V, VCEO 50 V, IC 150 mA continuous collector current and PC 100 mW collector power dissipation. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-523 |
| 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=100µA, 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=100µA, IC=0 | 1 | ||
| Collector cut-off current | ICBO | 100 | nA | VCB=60V, IE=0 | 1 | ||
| Emitter cut-off current | IEBO | 100 | nA | VEB=5V, IC=0 | 1 | ||
| DC current gain | hFE | 120 | 700 | VCE=6V, IC=2mA | 1 | ||
| Collector-emitter saturation voltage | VCE(sat) | 0.25 | V | IC=100mA, IB=10mA | 1 | ||
| Transition frequency | fT | 80 | MHz | VCE=10V, IC=1mA | 1 | ||
| Collector output capacitance | Cob | 3.5 | pF | VCB=10V, IE=0, f=1MHz | 1 | ||
| Collector-base voltage | VCBO | 60 | V | 1 | |||
| Collector-emitter voltage | VCEO | 50 | V | 1 | |||
| Emitter-base voltage | VEBO | 5 | V | 1 | |||
| Collector current | IC | 150 | mA | 1 | |||
| Collector power dissipation | PC | 100 | mW | 1 | |||
| Operation junction and storage temperature range | TJ,Tstg | -55 | 150 | ℃ | 1 | ||
| Thermal resistance from junction to ambient | RΘJA | 1250 | ℃/W | 1 |
CAD (KiCad official)
- Symbol:
2SC4738 - Footprint:
Package_TO_SOT_SMD:SOT-523 - 3D model: SOT-523, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.8 mm nominal SOT-523 height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files:
2sc4738-etched.step/2sc4738-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);2sc4738.step/2sc4738.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (4 pp, sha256
907cad450afd7431, 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).