component
LMBT5551
Public Made by Adomby adom
LangJie Bipolar Transistors - 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
markdownLMBT5551
LangJie · Bipolar Transistors - BJT · SOT-23
LMBT5551 from LangJie, 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 controls the transistor; the datasheet's emitter-base voltage rating is VEBO 6.0 Vdc. |
| 2 | EMITTER | passive | Emitter terminal; the datasheet's emitter-base voltage rating is VEBO 6.0 Vdc and continuous collector current is limited to 600 mAdc. |
| 3 | COLLECTOR | passive | Collector terminal; for the LMBT5551 the datasheet gives VCEO 160 Vdc, VCBO 180 Vdc and continuous collector current 600 mAdc. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | LangJie |
| Package | SOT-23 |
| Category | Triode/MOS Tube/Transistor |
| 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-Emitter Breakdown Voltage | V(BR)CEO | 160 | Vdc | IC = 1.0 mAdc, IB = 0 | 2 | ||
| Collector-Base Breakdown Voltage | V(BR)CBO | 180 | Vdc | IC = 100 Adc, IE = 0 | 2 | ||
| Emitter-Base Breakdown Voltage | V(BR)EBO | 6 | Vdc | IE = 10 Adc, IC = 0 | 2 | ||
| Collector Cutoff Current | ICBO | 50 | Adc | VCB = 120 Vdc, IE = 0 | 2 | ||
| Emitter Cutoff Current | IEBO | 50 | nAdc | VEB = 4.0 Vdc, IC = 0 | 2 | ||
| DC Current Gain | hFE | 80 | IC = 1.0 mAdc, VCE = 5.0 Vdc | 2 | |||
| DC Current Gain | hFE | 80 | 250 | IC = 10 mAdc, VCE = 5.0 Vdc | 2 | ||
| DC Current Gain | hFE | 30 | IC = 50 mAdc, VCE = 5.0 Vdc | 2 | |||
| Collector-Emitter Saturation Voltage | VCE(sat) | 0.15 | Vdc | IC = 10 mAdc, IB = 1.0 mAdc | 2 | ||
| Collector-Emitter Saturation Voltage | VCE(sat) | 0.2 | Vdc | IC = 50 mAdc, IB = 5.0 mAdc | 2 | ||
| Base-Emitter Saturation Voltage | VBE(sat) | 1 | Vdc | IC = 10 mAdc, IB = 1.0 mAdc | 2 | ||
| Collector Emitter Cut-off Current | ICES | 50 | nA | VCB = 10 V | 2 | ||
| Collector Emitter Cut-off Current | ICES | 100 | nA | VCB = 75 V | 2 | ||
| Collector-Emitter Voltage | VCEO | 160 | Vdc | 1 | |||
| Collector-Base Voltage | VCBO | 180 | Vdc | 1 | |||
| Emitter-Base Voltage | VEBO | 6 | Vdc | 1 | |||
| Collector Current - Continuous | IC | 600 | mAdc | 1 | |||
| Junction and Storage Temperature | TJ, Tstg | -55 | 150 | °C | 1 | ||
| Total Device Dissipation FR-5 Board | PD | 225 | mW | FR-5 Board (Note 1) @TA = 25°C | 1 | ||
| Derate Above 25°C FR-5 Board | PD | 1.8 | mW/°C | FR-5 Board, derate above 25°C | 1 | ||
| Thermal Resistance, Junction-to-Ambient FR-5 Board | RJA | 556 | °C/W | FR-5 Board | 1 | ||
| Total Device Dissipation Alumina Substrate | PD | 300 | mW | Alumina Substrate (Note 2) @TA = 25°C | 1 | ||
| Derate Above 25°C Alumina Substrate | PD | 2.4 | mW/°C | Alumina Substrate, derate above 25°C | 1 | ||
| Thermal Resistance, Junction-to-Ambient Alumina Substrate | RJA | 417 | °C/W | Alumina Substrate | 1 |
CAD (KiCad official)
- Symbol:
LMBT5551 - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
lmbt5551-etched.step/lmbt5551-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lmbt5551.step/lmbt5551.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: LangJie datasheet (5 pp, sha256
b9a5a35fe0c79ad8, retrieved 2026-10-27, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusoff(skipped (clean text read)), 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).