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FMMT558TA

Public Made by Adom

by adom

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

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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

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FMMT558TA

Diodes Incorporated · Bipolar Transistors - BJT · SOT-23

FMMT558TA 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 of the PNP transistor; the pin-out drawing places it at the lower right of the top view, with VEBO limited to -7V and IB to -200mA.
2 E passive Emitter of the PNP transistor; the pin-out drawing places it at the upper right of the top view, with VEBO limited to -7V.
3 C passive Collector of the PNP transistor, the single pin on the opposite side of the body, rated VCEO -400V, VCBO -400V, IC -150mA continuous and ICM -500mA peak.

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
Package SOT-23
Category Transistors
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 Voltage VCBO -400 V TA = +25°C 2
Collector-Emitter Voltage VCEO -400 V TA = +25°C 2
Emitter-Base Voltage VEBO -7 V TA = +25°C 2
Continuous Collector Current IC -150 mA TA = +25°C 2
Peak Pulse Current ICM -500 mA TA = +25°C 2
Base Current IB -200 mA TA = +25°C 2
Power Dissipation PD 500 mW Note 5 2
Thermal Resistance, Junction to Ambient RθJA 250 °C/W Note 5 2
Thermal Resistance, Junction to Lead RθJL 197 °C/W Note 6 2
Operating and Storage Temperature Range TJ, TSTG -55 150 °C 2
Collector-Base Breakdown Voltage BVCBO -400 V IC = -100µA 4
Collector-Emitter Breakdown Voltage BVCEO -400 V IC = -1mA 4
Emitter-Base Breakdown Voltage BVEBO -7 V IE = -100µA 4
Collector Cutoff Current ICBO -100 nA VCB = -320V 4
Emitter Cutoff Current IEBO -100 nA VEB = -5.6V 4
Collector Emitter Cutoff Current ICES -100 nA VCE = -320V 4
Static Forward Current Transfer Ratio hFE 100 IC = -1mA, VCE = -10V 4
Static Forward Current Transfer Ratio hFE 100 300 IC = -50mA, VCE = -10V 4
Static Forward Current Transfer Ratio hFE 15 IC = -100mA, VCE = -10V 4
Collector-Emitter Saturation Voltage VCE(sat) -200 mV IC = -20mA, IB = -2mA 4
Collector-Emitter Saturation Voltage VCE(sat) -500 mV IC = -50mA, IB = -6mA 4
Base-Emitter Turn-On Voltage VBE(on) -0.9 V IC = -50mA, VCE = -10V 4
Base-Emitter Saturation Voltage VBE(sat) -0.9 V IC = -50mA, IB = -5mA 4
Output Capacitance Cobo 5 pF VCB = -20V, f = 1MHz 4
Transition Frequency fT 50 MHz VCE = -20V, IC = -10mA, f = 20MHz 4
Turn-On Time ton 95 ns VCE = -100V, IC = -50mA, IB1 = 5mA, IB2 = -10mA 4
Turn-Off Time toff 1600 ns VCE = -100V, IC = -50mA, IB1 = 5mA, IB2 = -10mA 4

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 1

CAD (KiCad official)

  • Symbol: FMMT558TA
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: fmmt558ta-etched.step / fmmt558ta-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); fmmt558ta.step / fmmt558ta.glb are the bare package body.

Provenance

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

  • Datasheet: Diodes Incorporated datasheet (7 pp, sha256 cee1924a582046e6, retrieved 2026-10-22, 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