component
KST8550S
Public Made by Adomby adom
KEXIN 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
markdownKST8550S
KEXIN · Bipolar (BJT) · SOT-23
KST8550S from KEXIN, 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 PNP transistor; VBE(sat) is -1.2 V max at IC=-500mA, IB=-50mA. |
| 2 | Emitter | passive | Emitter terminal of the PNP transistor; the emitter-base breakdown voltage VEBO is -5 V. |
| 3 | Collector | passive | Collector terminal of the PNP transistor; rated at VCBO -40 V, VCEO -25 V and continuous collector current IC -0.5 A. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | KEXIN |
| 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 | VCBO | -40 | V | IC=-100 A, IE=0 | 1 | ||
| Collector-emitter breakdown voltage | VCEO | -25 | V | IC=-1mA, IB=0 | 1 | ||
| Emitter-base breakdown voltage | VEBO | -5 | V | IE=-100 A, IC=0 | 1 | ||
| Collector cut-off current | ICBO | -0.1 | A | VCB=-40V, IE=0 | 1 | ||
| Emitter cut-off current | IEBO | -0.1 | A | VEB=-3V, IC=0 | 1 | ||
| DC current gain | hFE | 120 | 400 | VCE=-1V, IC=-50mA | 1 | ||
| DC current gain | hFE | 50 | VCE=-1V, IC=-500mA | 1 | |||
| Collector-emitter saturation voltage | VCE(sat) | -0.5 | V | IC=-500mA, IB=-50mA | 1 | ||
| Base-emitter saturation voltage | VBE(sat) | -1.2 | V | IC=-500mA, IB=-50mA | 1 | ||
| Transition frequency | fT | 150 | MHz | VCE= -6V, IC= -20mA,f=30MHz | 1 | ||
| Collector-base voltage | VCBO | -40 | V | 1 | |||
| Collector-emitter voltage | VCEO | -25 | V | 1 | |||
| Emitter-base voltage | VEBO | -5 | V | 1 | |||
| Collector current -Continuous | IC | -0.5 | A | 1 | |||
| Collector power dissipation | PC | 0.3 | W | 1 | |||
| Junction temperature | Tj | 150 | 1 | ||||
| Storage temperature | Tstg | -55 | 150 | 1 |
CAD (KiCad official)
- Symbol:
KST8550S - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
kst8550s-etched.step/kst8550s-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);kst8550s.step/kst8550s.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: KEXIN datasheet (2 pp, sha256
9f6e362ca105794a, 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).