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FMMTA42

Public Made by Adom

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

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FMMTA42

Diodes Incorporated · Bipolar (BJT) · SOT-23

FMMTA42 from Diodes Incorporated, 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; drives the NPN transistor, with VEBO limited to 7 V and IEBO max 100 nA at VEB = 6 V.
2 E passive Emitter; the current return terminal of the NPN transistor, with VEBO limited to 7 V.
3 C passive Collector; rated for VCEO 300 V, VCBO 300 V and IC 200 mA.

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
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 BVCBO 300 V IC = 100µA 4
Collector-Emitter Breakdown Voltage BVCEO 300 V IC = 1mA 4
Emitter-Base Breakdown Voltage BVEBO 7 V IE = 100µA 4
Collector Cutoff Current ICES 100 nA VCE = 200V 4
Emitter Cutoff Current IEBO 100 nA VEB = 6V 4
Static Forward Current Transfer Ratio hFE 25 IC = 1mA, VCE = 10V 4
Static Forward Current Transfer Ratio hFE 40 IC = 10mA, VCE = 10V 4
Collector-Emitter Saturation Voltage VCE(sat) 500 mV IC = 20mA, IB = 2mA 4
Base-Emitter Saturation Voltage VBE(sat) 900 mV IC = 20mA, IB = 2mA 4
Output Capacitance Cobo 6 pF VCB = 20V, f = 1MHz 4
Transition Frequency fT 50 MHz VCE = 20V, IC = 10mA, f = 20MHz 4
Collector-Base Voltage VCBO 300 V @TA = +25°C 2
Collector-Emitter Voltage VCEO 300 V @TA = +25°C 2
Emitter-Base Voltage VEBO 7 V @TA = +25°C 2
Collector Current IC 200 mA @TA = +25°C 2
Power Dissipation (Note 5) PD 310 mW Minimum recommended pad layout, @TA = +25°C 2
Power Dissipation (Note 6) PD 350 mW 15mm x 15mm 1oz copper, @TA = +25°C 2
Thermal Resistance, Junction to Ambient (Note 5) RθJA 403 °C/W Minimum recommended pad layout 2
Thermal Resistance, Junction to Ambient (Note 6) RθJA 357 °C/W 15mm x 15mm 1oz copper 2
Thermal Resistance, Junction to Leads RθJL 350 °C/W Note 7 2
Operating and Storage Temperature Range TJ, TSTG -55 150 °C 2
ESD Human Body Model ESD HBM 4000 V JEDEC Class 3A 2
ESD Machine Model ESD MM 400 V JEDEC Class C 2

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
contacts tin  Terminals: Finish - Matte Tin Plated Leads, Solderable per MIL￾STD-202, Method 208  Weight: 0.008 grams (Approximate) 1

CAD (KiCad official)

  • Symbol: FMMTA42
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: fmmta42-etched.step / fmmta42-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); fmmta42.step / fmmta42.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Diodes Incorporated datasheet (6 pp, sha256 213f554043df59c7, retrieved 2026-10-27, tier: manufacturer)
  • 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