component
ZUMT491
Public Made by Adomby adom
Changjing Bipolar (BJT), SOT-323. 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
markdownZUMT491
Changjing · Bipolar (BJT) · SOT-323
ZUMT491 from Changjing, in a SOT-323. 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; emitter-base voltage VEBO is rated 5 V max and V(BR)EBO is 5 V at IE=100µA. |
| 2 | EMITTER | passive | Emitter terminal of the NPN transistor; the datasheet's emitter-base limits and the 1 A continuous collector current rating are referenced to this pin. |
| 3 | COLLECTOR | passive | Collector terminal of the NPN transistor; rated VCBO 80 V, VCEO 60 V, continuous collector current IC 1 A, with collector power dissipation PC listed as 250 mW. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-323 |
| 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 | 80 | V | IC=100µA,IE=0 | 1 | ||
| Collector-emitter breakdown voltage | V(BR)CEO | 60 | V | IC=10mA,IB=0 | 1 | ||
| Emitter-base breakdown voltage | V(BR)EBO | 5 | V | IE=100µA,IC=0 | 1 | ||
| Collector cut-off current | ICBO | 0.1 | μA | VCB=60V,IE=0 | 1 | ||
| Emitter cut-off current | IEBO | 0.1 | μA | VEB=4V,IC=0 | 1 | ||
| DC current gain | hFE(1) | 100 | VCE=5V, IC=1mA | 1 | |||
| DC current gain | hFE(2) * | 100 | 300 | VCE=5V, IC=500mA | 1 | ||
| DC current gain | hFE(3) * | 80 | VCE=5V, IC=1A | 1 | |||
| DC current gain | hFE(4) * | 30 | VCE=5V, IC=2A | 1 | |||
| Collector-emitter saturation voltage | VCE(sat)1 * | 0.25 | V | IC=500mA,IB=50mA | 1 | ||
| Collector-emitter saturation voltage | VCE(sat)2 * | 0.5 | V | IC=1A,IB=100mA | 1 | ||
| Base emitter saturation voltage | VBE(sat) * | 1.1 | V | IC=1A, IB=100mA | 1 | ||
| Base emitter turn on voltage | VBE(on) * | 1 | V | VCE=5V,IC=1A | 1 | ||
| Transition frequency | fT | 150 | MHz | VCE=10V, IC=50mA,f=100MHz | 1 | ||
| Collector output capacitance | Cob | 10 | pF | VCB=10V,IE=0,f=1MHz | 1 | ||
| Collector-Base Voltage | VCBO | 80 | V | 1 | |||
| Collector-Emitter Voltage | VCEO | 60 | V | 1 | |||
| Emitter-Base Voltage | VEBO | 5 | V | 1 | |||
| Collector Current | IC | 1 | A | 1 | |||
| Collector Power Dissipation | PC | 250 | mW | 1 | |||
| Thermal Resistance From Junction To ambient | RθJA | 500 | ℃/W | 1 | |||
| Operation Junction and Storage Temperature Range | TJ,Tstg | -55 | 150 | ℃ | 1 |
CAD (KiCad official)
- Symbol:
ZUMT491 - Footprint:
Package_TO_SOT_SMD:SOT-323_SC-70 - 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files:
zumt491-etched.step/zumt491-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);zumt491.step/zumt491.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (3 pp, sha256
be1e19f29077a7d8, 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).