component
MMBT5550LT3G
Public Made by Adomby adom
onsemi 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
markdownMMBT5550LT3G
onsemi · Bipolar (BJT) · SOT-23
MMBT5550LT3G from onsemi, 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 NPN transistor (STYLE 6, pin 1); the device maximum ratings apply, including emitter-base voltage VEBO of 6.0 Vdc and continuous collector current IC of 600 mAdc. |
| 2 | EMITTER | passive | Emitter terminal of the NPN transistor (STYLE 6, pin 2); the device maximum ratings apply, including emitter-base voltage VEBO of 6.0 Vdc. |
| 3 | COLLECTOR | passive | Collector terminal of the NPN transistor (STYLE 6, pin 3); for the MMBT5550 the datasheet lists VCEO of 140 Vdc, VCBO of 160 Vdc and continuous IC of 600 mAdc. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| 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-Emitter Breakdown Voltage (MMBT5550) | V(BR)CEO | 140 | Vdc | IC = 1.0 mAdc, IB = 0 | 3 | ||
| Collector-Base Breakdown Voltage (MMBT5550) | V(BR)CBO | 160 | Vdc | IC = 100 Adc, IE = 0 | 3 | ||
| Emitter-Base Breakdown Voltage | V(BR)EBO | 6 | Vdc | IE = 10 Adc, IC = 0 | 3 | ||
| Collector Cutoff Current (MMBT5550, TA = 25°C) | ICBO | 100 | nAdc | VCB = 100 Vdc, IE = 0 | 3 | ||
| Collector Cutoff Current (MMBT5550, TA = 100°C) | ICBO | 100 | nAdc | VCB = 100 Vdc, IE = 0, TA = 100°C | 3 | ||
| Emitter Cutoff Current | IEBO | 50 | nAdc | VEB = 4.0 Vdc, IC = 0 | 3 | ||
| DC Current Gain (MMBT5550) | hFE | 60 | - | IC = 1.0 mAdc, VCE = 5.0 Vdc | 3 | ||
| DC Current Gain (MMBT5550) | hFE | 20 | - | IC = 50 mAdc, VCE = 5.0 Vdc | 3 | ||
| Collector-Emitter Saturation Voltage (both types) | VCE(sat) | 0.15 | Vdc | IC = 10 mAdc, IB = 1.0 mAdc | 3 | ||
| Collector-Emitter Saturation Voltage (MMBT5550) | VCE(sat) | 0.25 | Vdc | IC = 50 mAdc, IB = 5.0 mAdc | 3 | ||
| Base-Emitter Saturation Voltage (both types) | VBE(sat) | 1 | Vdc | IC = 10 mAdc, IB = 1.0 mAdc | 3 | ||
| Base-Emitter Saturation Voltage (MMBT5550) | VBE(sat) | 1.2 | Vdc | IC = 50 mAdc, IB = 5.0 mAdc | 3 | ||
| Collector Emitter Cut-off Current (both types) | ICES | 50 | nA | VCB = 10 V | 3 | ||
| Collector Emitter Cut-off Current | ICES | 100 | nA | VCB = 75 V | 3 | ||
| Collector-Emitter Voltage (MMBT5550) | VCEO | 140 | Vdc | 2 | |||
| Collector-Base Voltage (MMBT5550) | VCBO | 160 | Vdc | 2 | |||
| Emitter-Base Voltage | VEBO | 6 | Vdc | 2 | |||
| Collector Current - Continuous | IC | 600 | mAdc | 2 | |||
| Electrostatic Discharge Human Body Model | ESD | 8000 | V | Human Body Model | 2 | ||
| Electrostatic Discharge Machine Model | ESD | 400 | V | Machine Model | 2 | ||
| Total Device Dissipation FR-5 Board | PD | 225 | mW | FR-5 Board (Note 1) @TA = 25°C | 2 | ||
| Total Device Dissipation Alumina Substrate | PD | 300 | mW | Alumina Substrate (Note 2) @TA = 25°C | 2 | ||
| Thermal Resistance, Junction-to-Ambient (FR-5 Board) | RθJA | 556 | °C/W | FR-5 Board (Note 1) | 2 | ||
| Thermal Resistance, Junction-to-Ambient (Alumina Substrate) | RθJA | 417 | °C/W | Alumina Substrate (Note 2) | 2 | ||
| Junction and Storage Temperature | TJ, Tstg | -55 | 150 | °C | 2 |
CAD (KiCad official)
- Symbol:
MMBT5550LT3G - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
mmbt5550lt3g-etched.step/mmbt5550lt3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmbt5550lt3g.step/mmbt5550lt3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (8 pp, sha256
a3009b7236dbe8f2, 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).