component
MMBT5179
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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Contents
README
markdownMMBT5179
onsemi · Bipolar (BJT) · SOT-23
MMBT5179 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 | B | input | Base; ratings are VEBO 2.5 V max and V(BR)EBO 2.5 V min at IE = 10 µA. |
| 2 | E | passive | Emitter; the datasheet gives VEBO 2.5 V max and IC 50 mA continuous. |
| 3 | C | passive | Collector; VCEO 12 V, VCBO 20 V and IC 50 mA continuous maximum. |
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 Voltage | VCEO | 12 | V | 2 | |||
| Collector-Base Voltage | VCBO | 20 | V | 2 | |||
| Emitter-Base Voltage | VEBO | 2.5 | V | 2 | |||
| Collector Current - Continuous | IC | 50 | mA | 2 | |||
| Operating and Storage Junction Temperature Range | TJ, Tstg | -55 | 150 | °C | 2 | ||
| Total Device Dissipation (SOT-23, MMBT5179) | PD | 225 | mW | TA = 25°C, device mounted on FR-4 PCB 1.6 in x 1.6 in x 0.06 in | 2 | ||
| Thermal Resistance, Junction to Ambient (SOT-23, MMBT5179) | RθJA | 556 | °C/W | Device mounted on FR-4 PCB 1.6 in x 1.6 in x 0.06 in | 2 | ||
| Collector-Emitter Sustaining Voltage | VCEO(sus) | 12 | V | IC = 3.0 mA, IB = 0 | 3 | ||
| Collector-Base Breakdown Voltage | V(BR)CBO | 20 | V | IC = 1.0 µA, IE = 0 | 3 | ||
| Emitter-Base Breakdown Voltage | V(BR)EBO | 2.5 | V | IE = 10 µA, IC = 0 | 3 | ||
| Collector Cutoff Current | ICBO | 0.02 | µA | VCB = 15 V, IE = 0 | 3 | ||
| Collector Cutoff Current | ICBO | 1 | µA | VCB = 15 V, TA = 150°C | 3 | ||
| DC Current Gain | hFE | 25 | 250 | IC = 3.0 mA, VCE = 1.0 V | 3 | ||
| Collector-Emitter Saturation Voltage | VCE(sat) | 0.4 | V | IC = 10 mA, IB = 1.0 mA | 3 | ||
| Base-Emitter Saturation Voltage | VBE(sat) | 1 | V | IC = 10 mA, IB = 1.0 mA | 3 | ||
| Current Gain - Bandwidth Product | fT | 900 | 2000 | MHz | IC = 5.0 mA, VCE = 6.0 V, f = 100 MHz | 3 | |
| Collector-Base Capacitance | Ccb | 1 | pF | VCB = 10 V, IE = 0, f = 0.1 to 1.0 MHz | 3 | ||
| Small-Signal Current Gain | hfe | 25 | 300 | IC = 2.0 mA, VCE = 6.0 V, f = 1.0 kHz | 3 | ||
| Collector Base Time Constant | rb'Cc | 3 | 14 | ps | IC = 2.0 mA, VCB = 6.0 V, f = 31.9 MHz | 3 | |
| Noise Figure | NF | 5 | dB | IC = 1.5 mA, VCE = 6.0 V, RS = 50Ω, f = 200 MHz | 3 | ||
| Amplifier Power Gain | Gpe | 15 | dB | VCE = 6.0 V, IC = 5.0 mA, f = 200 MHz | 3 | ||
| Power Output | PO | 20 | mW | VCB = 10 V, IE = 12 mA, f ≥ 500 MHz | 3 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing | polyester | resin. The cover tape is a multilayer film (Heat Activated Adhesive in nature) primarily composed of polyester film, | 10 |
CAD (KiCad official)
- Symbol:
MMBT5179 - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
mmbt5179-etched.step/mmbt5179-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mmbt5179.step/mmbt5179.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (14 pp, sha256
e325da282cbd842e, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).