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MMBT4240

Public Made by Adom

by adom

ST Semtech Zener Diodes, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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MMBT4240

ST Semtech · Zener Diodes · SOT-23

MMBT4240 from ST Semtech, 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 passive Base terminal of the NPN general-purpose transistor; the emitter-base voltage is limited to 5 V (VEBO) and the peak base current to 300 mA (IBM) in the absolute maximum ratings.
2 Emitter passive Emitter terminal of the NPN general-purpose transistor; the emitter-base voltage is limited to 5 V (VEBO) in the absolute maximum ratings.
3 Collector passive Collector terminal of the NPN general-purpose transistor; the collector-emitter voltage is limited to 40 V (VCEO) and the DC collector current to 2 A (IC) in the absolute maximum ratings.

Key specifications

Parameter Value
Manufacturer ST Semtech
Package SOT-23
Category Diodes
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 40 V 1
Collector Emitter Voltage VCEO 40 V 1
Emitter Base Voltage VEBO 5 V 1
Collector Current (DC) IC 2 A 1
Peak Collector Current ICM 3 A 1
Peak Base Current IBM 300 mA 1
Total Power Dissipation Ptot 350 mW Note 1: FR-4 PCB, 2oz copper, minimum recommended pad layout 1
Total Power Dissipation Ptot 480 mW Note 2: FR-4 PCB, 2oz copper, 1-inch square copper plate 1
Junction Temperature Tj 150 ℃ 1
Storage Temperature Range Tstg -65 150 ℃ 1
Thermal Resistance - Junction to Ambient RθJA 357 Note 1: FR-4 PCB, 2oz copper, minimum recommended pad layout 1
Thermal Resistance - Junction to Ambient RθJA 260 Note 2: FR-4 PCB, 2oz copper, 1-inch square copper plate 1
DC Current Gain hFE 350 VCE = 2 V, IC = 100 mA 2
DC Current Gain hFE 300 VCE = 2 V, IC = 500 mA 2
DC Current Gain hFE 250 VCE = 2 V, IC = 1 A 2
DC Current Gain hFE 80 VCE = 2 V, IC = 2 A 2
Collector Base Cutoff Current ICBO 100 nA VCB = 30 V 2
Emitter Base Cutoff Current IEBO 100 nA VEB = 4 V 2
Collector Emitter Saturation Voltage VCE(sat) 70 mV IC = 100 mA, IB = 1 mA 2
Collector Emitter Saturation Voltage VCE(sat) 100 mV IC = 500 mA, IB = 50 mA 2
Collector Emitter Saturation Voltage VCE(sat) 180 mV IC = 750 mA, IB = 15 mA 2
Collector Emitter Saturation Voltage VCE(sat) 320 mV IC = 2 A, IB = 200 mA 2
Base Emitter Saturation Voltage VBE(sat) 1.1 V IC = 2 A, IB = 200 mA 2
Base Emitter Turn-on Voltage VBE(on) 0.75 V VCE = 2 V, IC = 100 mA 2
Transition Frequency fT 100 230 MHz VCE = 10 V, IC = 100 mA, f = 100 MHz 2
Collector Output Capacitance Cob 10 20 pF VCB = 10 V, f = 1 MHz 2

CAD (KiCad official)

  • Symbol: MMBT4240
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: mmbt4240-etched.step / mmbt4240-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmbt4240.step / mmbt4240.glb are the bare package body.

Provenance

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

  • Datasheet: ST Semtech datasheet (5 pp, sha256 fab193ab61776b27, retrieved 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF