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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Diodes Incorporated MMBT4401T-7

Name: MMBT4401T-7
Brand: Diodes Incorporated
SKU: MMBT4401T-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBT4401T-7

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: SOT-523

Datasheet:: MMBT4401T-7.pdf

Description:: TRANS NPN 40V 0.6A SOT-523

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MMBT4401T-7 from Diodes Incorporated is an NPN small-signal transistor in SOT523 package, rated for 40 V V_CEO, 600 mA I_C, and 150 mW power dissipation, commonly used in low-power switching and amplification stages of portable electronics, LED drivers, and signal conditioning circuits.

For engineers reviewing the MMBT4401T-7 datasheet, MMBT4401T-7 pinout, MMBT4401T-7 application, or MMBT4401T-7 equivalent, key selection criteria include V_CEO margin, h_FE consistency across 100 µA–500 mA, V_CE(sat) at high drive current, thermal resistance (R_θJA = 833 °C/W), and SOT523 footprint compatibility with space-constrained PCB layouts.

Technical Context

This NPN bipolar junction transistor operates in active, saturation, and cutoff regions with verified DC current gain (h_FE) ranging from 20 to 300 depending on collector current (100 µA to 500 mA) and V_CE = 1 V. It supports fast switching with t_d ≤ 15 ns, t_r ≤ 20 ns, t_s ≤ 225 ns, and t_f ≤ 30 ns under 30 V V_CC and 150 mA I_C.

Its small-signal parameters include f_T = 250 MHz at V_CE = 20 V and I_C = 20 mA, C_obo = 6.5 pF at V_CB = 5 V, and h_ie = 1–15 kΩ at V_CE = 10 V, I_C = 1 mA - confirming suitability for RF preamplifier and broadband switching applications up to ~100 MHz.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 V - Maximum safe collector-emitter voltage before breakdown; ensures robustness in 24 V logic-level switching.
I_C	600 mA - Continuous collector current rating; supports moderate-load digital output buffering and LED driver stages.
P_D	150 mW - Power dissipation limit on FR-4 PCB with minimal copper; requires thermal derating above +25°C ambient.
h_FE	20–300 - DC current gain range across operating conditions; enables predictable biasing from microamp to half-amp loads.
V_CE(sat)	0.4–0.75 V - Saturation voltage at I_C/I_B = 10; determines conduction loss and heat generation in switch mode.
f_T	250 MHz - Transition frequency; validates use in VHF-band amplifiers and high-speed digital interface buffers.
R_θJA	833 °C/W - Junction-to-ambient thermal resistance; indicates strong dependence on PCB copper area for thermal management.

Pinout & Package

Package: SOT523 - ultra-small surface-mount plastic package (1.60 × 1.60 × 0.75 mm), lead-free, halogen-free, moisture sensitivity level 1 per J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to ground or low-side return path; defines reference for base drive and current flow direction.
2 (Base)	Control input	Receives forward-biased current to turn on transistor; requires series resistor to limit I_B and ensure saturation.
3 (Collector)	Current source terminal	Connected to load and supply rail; carries full I_C; must be routed with adequate trace width for 600 mA.

Key Features

Feature	Design Value
Ultra-small SOT523 footprint	Enables high-density placement in wearables, hearing aids, and compact IoT sensor nodes where board space is ≤ 3 mm² per device.
V_CEO ≥ 40 V	Provides 2× margin over common 24 V industrial bus voltages, reducing risk of avalanche failure during transients.
ESD HBM rating: 4 kV	Allows direct handling and assembly without special ESD precautions in standard Class 1B environments.
Complementary PNP pair	MMBT2907AT shares identical SOT523 package and thermal profile, enabling matched push-pull stage design with minimal layout asymmetry.

Applications

LED Driver Stage

Microcontroller GPIO Expander

Use Scenario: Driving 20–60 mA indicator LEDs from 3.3 V or 5 V MCU outputs.

IC Role / Device Role / Timing Role: Low-side switch controlling LED current path to ground.

Use Value: V_CE(sat) ≤ 0.4 V at I_C = 150 mA minimizes power loss (< 60 mW), preserving battery life in portable devices.

Use Scenario: Amplifying weak analog sensor signals (e.g., thermistor, photodiode) before ADC sampling.

IC Role / Device Role / Timing Role: Common-emitter amplifier providing 20–100× voltage gain with stable h_FE at I_C = 1–10 mA.

Use Value: f_T = 250 MHz and h_ie = 1–15 kΩ support bandwidth > 1 MHz while maintaining low input loading on high-impedance sources.

Low-Voltage Logic Interface

Automotive Body Control Module

Use Scenario: Level-shifting between 1.8 V/3.3 V logic domains and 5 V/12 V peripheral interfaces.

IC Role / Device Role / Timing Role: Digital switch translating logic states with < 20 ns rise/fall times.

Use Value: Fast switching (t_r/t_f ≤ 20/30 ns) ensures clean edges for 10+ MHz clock/data lines without added propagation delay.

Use Scenario: Controlling solenoids, relays, and small motors in 12 V automotive subsystems.

IC Role / Device Role / Timing Role: High-reliability discrete switch in non-safety-critical body electronics (e.g., mirror fold, seat position).

Use Value: AEC-Q101 qualification available upon request; R_θJA = 833 °C/W allows operation up to +105°C ambient with proper copper pour.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN small-signal transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC846BW,115	V_CEO = 65 V, h_FE = 110–220 @ I_C = 10 mA, SOT323 package (larger than SOT523)	Higher voltage headroom but 30% larger footprint; less suitable for ultra-dense layouts	Select when V_CEO > 40 V is required and board space permits SOT323.
PN2222A-AP	V_CEO = 40 V, I_C = 800 mA, TO-92 package (through-hole), R_θJA ≈ 200 °C/W	Higher current capability but incompatible with automated SMT assembly and thermal performance	Choose only for prototyping or legacy through-hole designs where reflow compatibility is not needed.

Compared with BC846BW and PN2222A-AP, MMBT4401T-7 delivers optimal balance of miniaturization (SOT523), 40 V robustness, and 600 mA drive in production-grade SMT manufacturing - making it preferred for volume consumer and automotive body electronics where size, reliability, and process compatibility are jointly critical.

Availability

MMBT4401T-7 is available at Aetrix Electronics and suitable for LED driver stages, microcontroller GPIO expansion, low-voltage logic interface, and automotive body control modules requiring stable component supply and consistent parametric performance across production lots.

Supply support for MMBT4401T-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and distribution operations across Asia, Europe, and North America.

The MMBT4401T-7 belongs to Diodes' general-purpose small-signal transistor product line, engineered for cost-sensitive, space-constrained applications demanding reliable switching and amplification in consumer, computing, and automotive systems.

FAQ

What is the maximum continuous collector current for MMBT4401T-7?

The absolute maximum continuous collector current is 600 mA at T_A = +25°C. Derating is required above ambient temperature: power dissipation drops linearly at 1.2 mW/°C beyond +25°C due to its 833 °C/W thermal resistance. At +85°C ambient, usable I_C is limited to approximately 420 mA to maintain safe junction temperature.

Is MMBT4401T-7 qualified for automotive applications?

MMBT4401T-7 is not pre-qualified to AEC-Q101 in standard form, but Diodes offers AEC-Q101-qualified versions (e.g., MMBT4401Q-7-F) with PPAP documentation, IATF 16949 manufacturing, and extended temperature validation. Customers requiring automotive-grade assurance must specify the "Q" suffix part number and engage Diodes' automotive sales team for qualification support.

How does the SOT523 package affect thermal performance?

The SOT523 package has high thermal resistance (R_θJA = 833 °C/W) due to minimal copper exposure and tiny die attach area. Effective thermal management requires at least 25 mm² of 1 oz copper connected to the collector pad via multiple thermal vias. Without this, junction temperature can exceed 150°C even at 300 mA I_C and +40°C ambient.

What is the typical V_BE(sat) at I_C = 500 mA?

At I_C = 500 mA and I_B = 50 mA (10:1 drive ratio), V_BE(sat) is specified as 0.95–1.2 V. This reflects increased base-emitter junction voltage under high-current saturation, directly impacting base drive circuit power loss and required gate/base driver strength in high-speed switching designs.

MMBT4401T-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SOT-523

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 600 mA

Voltage - Collector Emitter Breakdown (Max):: 40 V

Vce Saturation (Max) @ Ib, Ic:: 750mV @ 50mA, 500mA

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 150mA, 1V

Power - Max:: 150 mW

Frequency - Transition:: 250MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-523

MMBT4401T-7 FAQ

1.How can I place an order for MMBT4401T-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBT4401T-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MMBT4401T-7 reliable?

The price and inventory of MMBT4401T-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBT4401T-7 is usually 5 days.

3.What payment methods are accepted for MMBT4401T-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT4401T-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBT4401T-7?

MMBT4401T-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBT4401T-7 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MMBT4401T-7?

For technical support, including MMBT4401T-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT4401T-7 requirements.

6.How does Aetrix verify that MMBT4401T-7 is sourced from the original manufacturer or authorized distributors?

All MMBT4401T-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MMBT4401T-7 meets industry standards.

7.What is the process for return or replacement of MMBT4401T-7?

All MMBT4401T-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBT4401T-7, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MMBT4401T-7 part is unused and in its original packaging.

Return procedure for MMBT4401T-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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