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MMBT5240

Public Made by Adom

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

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Datasheet

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Contents

README

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MMBT5240

ST Semtech · Zener Diodes · SOT-23

MMBT5240 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 PNP transistor; the datasheet gives a peak base current limit of 300 mA (-IBM).
2 Emitter passive Emitter terminal of the PNP transistor; the emitter-base voltage is rated at -VEBO 5 V.
3 Collector passive Collector terminal of the PNP transistor; rated at -VCEO 40 V, -IC 2 A continuous and -ICM 3 A peak.

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
DC Current Gain hFE 300 at -VCE = 2 V, -IC = 100 mA 2
DC Current Gain hFE 260 at -VCE = 2 V, -IC = 500 mA 2
DC Current Gain hFE 210 at -VCE = 2 V, -IC = 1 A 2
DC Current Gain hFE 100 at -VCE = 2 V, -IC = 2 A 2
Collector Base Cutoff Current -ICBO 100 nA at -VCB = 30 V 2
Emitter Base Cutoff Current -IEBO 100 nA at -VEB = 4 V 2
Collector Emitter Saturation Voltage -VCE(sat) 100 mV at -IC = 100 mA, -IB = 1 mA 2
Collector Emitter Saturation Voltage -VCE(sat) 110 mV at -IC = 500 mA, -IB = 50 mA 2
Collector Emitter Saturation Voltage -VCE(sat) 225 mV at -IC = 750 mA, -IB = 15 mA 2
Collector Emitter Saturation Voltage -VCE(sat) 350 mV at -IC = 2 A, -IB = 200 mA 2
Base Emitter Saturation Voltage -VBE(sat) 1.1 V at -IC = 2 A, -IB = 200 mA 2
Base Emitter Turn-on Voltage -VBE(on) 0.75 V at -VCE = 2 V, -IC = 100 mA 2
Transition Frequency fT 100 MHz at -VCE = 10 V, -IC = 100 mA, f = 100 MHz 2
Output Capacitance Cob 35 pF at -VCB = 10 V, f = 1 MHz 2
Collector Base Voltage -VCBO 40 V 1
Collector Emitter Voltage -VCEO 40 V 1
Emitter Base Voltage -VEBO 5 V 1
Collector Current -IC 2 A 1
Peak Collector Current -ICM 3 A 1
Peak Base Current -IBM 300 mA 1
Power Dissipation Ptot 300 mW 1
Junction Temperature Tj 150 1
Storage Temperature Range Tstg -65 150 1
Thermal Resistance from Junction to Ambient RθJA 417 /W Device mounted on FR-4 substrate PC board, with minimum recommended pad layout 1

CAD (KiCad official)

  • Symbol: MMBT5240
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: mmbt5240-etched.step / mmbt5240-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmbt5240.step / mmbt5240.glb are the bare package body.

Provenance

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

  • Datasheet: ST Semtech datasheet (5 pp, sha256 5af310b1e013df5c, retrieved 2026-10-19, 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