Overview Files Discover Packages Releases Dependencies Issues Breadcrumbs Pull Requests Activity

3D Model

Open in new tab ↗

Loads when you scroll to it. Unloads after 5 minutes in the background.

Symbol & Footprint

Schematic Symbol

Open full view ↗

Loads when you scroll to it. Unloads after 5 minutes in the background.

PCB Footprint

Open full view ↗

Loads when you scroll to it. Unloads after 5 minutes in the background.

Datasheet

Open in new tab ↗

Loads when you scroll to it. Unloads after 5 minutes in the background.

Download PDF

Contents

Pinout
Key specifications
Electrical characteristics
CAD (KiCad official)
Provenance

README

markdown

MMBT4140

EIC Semicon · Bipolar Transistors - BJT · SOT-23

MMBT4140 from EIC Semicon, 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; emitter-base voltage VEBO max 5 V and peak base current IBM max 1 A.
2	E	passive	Emitter; the datasheet gives emitter-base voltage VEBO max 5 V.
3	C	passive	Collector; VCEO 30 V, VCBO 40 V, DC collector current IC 1 A and peak ICM 2 A maximum.

Key specifications

Parameter	Value
Manufacturer	EIC Semicon
Package	SOT-23
Category	Triode/MOS Tube/Transistor
Pins	3

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Max	Unit	Conditions	Page
Collector Base Voltage	VCBO		40	V	Ta = 25 °C	1
Collector Emitter Voltage	VCEO		30	V	Ta = 25 °C	1
Emitter Base Voltage	VEBO		5	V	Ta = 25 °C	1
Collector Current (DC)	IC		1	A	Ta = 25 °C	1
Peak Collector Current	ICM		2	A	Ta = 25 °C	1
Peak Base Current	IBM		1	A	Ta = 25 °C	1
Total Power Dissipation (standard footprint)	Ptot		200	mW	Device mounted on PCB; single sided copper; tinplated; standard footprint	1
Total Power Dissipation (1 cm2 collector pad)	Ptot		450	mW	Device mounted on PCB; single sided copper; tinplated; mounting pad for collector 1cm2	1
Junction Temperature	Tj		150	°C		1
Storage Temperature Range	Tstg	-65	150	°C		1
DC Current Gain	hFE	300			VCE = 5 V, IC = 1 mA	2
DC Current Gain	hFE	300	900		VCE = 5 V, IC = 500 mA	2
DC Current Gain	hFE	200			VCE = 5 V, IC = 1 A	2
Collector Base Cutoff Current	ICBO		100	nA	VCB = 40 V	2
Collector Emitter Cutoff Current	ICEO		100	nA	VCE = 30 V	2
Emitter Base Cutoff Current	IEBO		100	nA	VEB = 5 V	2
Collector Emitter Saturation Voltage	VCE(sat)		200	mV	IC = 100 mA, IB = 1 mA	2
Collector Emitter Saturation Voltage	VCE(sat)		250	mV	IC = 500 mA, IB = 50 mA	2
Collector Emitter Saturation Voltage	VCE(sat)		500	mV	IC = 1 A, IB = 100 mA	2
Base Emitter Saturation Voltage	VBE(sat)		1.2	V	IC = 1 A, IB = 100 mA	2
Base Emitter Turn-on Voltage	VBE(on)		1.1	V	VCE = 5 V, IC = 1 A	2
Transition Frequency	fT	150		MHz	VCE = 10 V, IC = 50 mA, f = 100 MHz	2
Collector Capacitance	Cob		10	pF	VCB = 10 V, f = 1 MHz	2

CAD (KiCad official)

Symbol: MMBT4140
Footprint: Package_TO_SOT_SMD:SOT-23
3D model: SOT-23 (KiCad packages3D, STEP)
3D model files: mmbt4140-etched.step / mmbt4140-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmbt4140.step / mmbt4140.glb are the bare package body.

Provenance

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

Datasheet: EIC Semicon datasheet (2 pp, sha256 72c769bcd97bd846, retrieved 2026-10-22, tier: lcsc)
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