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Generated by kicad-footprint-generator · KiCad file format 20260206

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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