component

MMBT5179

Public Made by Adom

by adom

onsemi Bipolar (BJT), SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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MMBT5179

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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmbt5179.step / mmbt5179.glb are 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, primary claude-sonnet-5-5 (text+vision), consensus claude-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).

Datasheet PDF