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

Diodes Incorporated MMST4403-7-F

Name: MMST4403-7-F
Brand: Diodes Incorporated
SKU: MMST4403-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMST4403-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: MMST4403-7-F.pdf

Description:: TRANS PNP 40V 0.6A SOT-323

Quantity:: RFQ Add To RFQ list

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Inventory:21,269

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Product details

Overview

MMST4403-7-F from Diodes Incorporated is a 40V PNP small-signal transistor in SOT323 package, rated for -600mA continuous collector current and 200mW power dissipation, with V_CE(sat) ≤ -0.75V at -500mA/-50mA drive, used in low-power switching and amplification circuits including load switching and signal inversion in portable electronics.

For engineers reviewing the MMST4403-7-F datasheet, MMST4403-7-F pinout, MMST4403-7-F application, or MMST4403-7-F equivalent, key selection criteria include guaranteed V_CEO = -40V, h_FE range of 30–300 across 100µA–500mA, thermal resistance R_θJA = 625°C/W on FR-4, and AEC-Q qualified automotive variants (Q-suffix) for mission-critical designs.

Technical Context

This PNP bipolar junction transistor operates in active, saturation, and cutoff regions with verified DC current gain h_FE ≥30 at IC = -100µA and ≥20 at IC = -500mA, supporting linear amplification and hard-switching functions. Its complementary NPN counterpart MMST4401 enables push-pull configurations in discrete amplifier stages.

Designed for surface-mount reliability, it meets JEDEC high-reliability standards and features lead-free, halogen-free "Green" construction with moisture sensitivity level 1 per J-STD-020. Thermal performance is characterized on standard FR-4 PCB (1" × 0.85" × 0.062") with R_θJC = 150°C/W to case top.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-40 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration.
I_C (cont.)	-600 mA - Continuous collector current rating defining maximum DC load-handling capability.
P_D	200 mW - Power dissipation limit on standard FR-4 board, constraining usable I²R and switching loss envelope.
V_CE(sat)	-0.75 V max @ -500mA/-50mA - Ensures low conduction loss in saturated switch applications like logic-level translation.
h_FE	30–300 - Validated DC current gain range across five test points, enabling predictable bias design from µA to 500mA loads.
f_T	200 MHz - Unity-gain frequency confirming suitability for RF preamp and broadband analog signal paths up to ~100MHz.
C_ob	8.5 pF @ -10V - Output capacitance limiting high-frequency response and affecting switching speed in fast digital interfaces.

Pinout & Package

Package: SOT323 - ultra-small plastic surface-mount package (2.15mm × 2.10mm × 0.95mm), rated for 0.006g weight and UL 94V-0 flammability compliance.

Pin/Terminal	Circuit Role	Design Meaning
Emitter (E)	Current source terminal in PNP operation	Connected to higher potential rail; defines reference for base control and current sourcing path.
Base (B)	Control input for carrier injection	Receives negative bias current to turn on; requires precise current limiting due to h_FE variance.
Collector (C)	Current sink terminal in PNP operation	Connected to load and lower potential; carries full output current with minimal V_CE(sat) drop.

Key Features

Feature	Design Value
Low V_CE(sat)	-0.40 V typical at -150mA/-15mA enables <100mW conduction loss in compact load switches.
High h_FE consistency	Min 30 at -100µA ensures stable bias in low-current sensor interface amplifiers.
JEDEC-qualified reliability	Validated to AEC-Q stress standards supports use in industrial control modules requiring >10-year field life.
Green packaging	Halogen- and antimony-free compound (<900ppm Br/Cl, <1000ppm Sb) meets IPC-1752a environmental reporting requirements.

Applications

Portable Power Management

Automotive Sensor Interface

Use Scenario: Discrete load switch controlling LED backlight or USB peripheral enable in battery-powered handheld devices.

IC Role / Device Role / Timing Role: PNP transistor operating in saturation as high-side current source switch.

Use Value: Low V_CE(sat) minimizes voltage drop and extends battery runtime; SOT323 footprint saves PCB area.

Use Scenario: Level-shifting and signal conditioning for analog sensors (e.g., temperature, pressure) in engine control units.

IC Role / Device Role / Timing Role: Linear amplifier stage providing gain and impedance matching between sensor output and ADC input.

Use Value: Stable h_FE over -55°C to +150°C ensures consistent gain across automotive temperature range.

Industrial PLC I/O Modules

Consumer Audio Signal Path

Use Scenario: Discrete transistor driver for optocoupler inputs or relay coils in programmable logic controller digital input cards.

IC Role / Device Role / Timing Role: Switching element translating 24V industrial logic levels to microcontroller-compatible signals.

Use Value: -40V V_CEO withstands transient surges on factory floor wiring; robust ESD tolerance reduces field failures.

Use Scenario: Input stage amplifier in headphone DAC output buffer or microphone preamplifier within compact audio SoCs.

IC Role / Device Role / Timing Role: Small-signal amplifier providing 20–30dB voltage gain with low noise and distortion.

Use Value: f_T = 200MHz supports wideband audio fidelity up to 20kHz with margin; C_ob < 9pF limits Miller effect.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT4403 (SOT23)	Larger SOT23 package (3.0mm × 1.4mm), 350mW P_D, identical electrical specs except R_θJA = 450°C/W.	Better thermal handling in higher-current switching; less space-constrained layouts.	Select when board layout allows larger footprint and >200mW dissipation is needed.
BC807-40 (SOT323)	Same SOT323 package, but h_FE = 250–630 at -100mA, V_CE(sat) = -0.7V max @ -500mA/-50mA.	Higher gain enables simpler bias networks; slightly higher saturation voltage increases conduction loss.	Prefer for gain-critical linear stages where tighter h_FE distribution improves production yield.

Compared with MMBT4403 and BC807-40, MMST4403-7-F delivers optimal trade-off between miniaturization (SOT323), thermal derating (200mW/625°C/W), and gain stability (30–300), making it ideal for space-constrained, thermally managed portable and automotive subsystems.

Availability

MMST4403-7-F is available at Aetrix Electronics and suitable for portable power management, automotive sensor interface, and industrial PLC I/O modules requiring stable component supply and RoHS-compliant manufacturing.

Supply support for MMST4403-7-F 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, specializing in high-reliability components for automotive, industrial, and consumer markets with ISO/TS 16949 and IATF 16949 certified facilities.

MMST4403 belongs to Diodes' small-signal transistor product line, engineered for precision switching and amplification in space-constrained, thermally demanding environments where lead-free, green packaging and JEDEC reliability are mandatory.

FAQ

What is the maximum operating temperature for MMST4403-7-F?

The MMST4403-7-F has an operating junction temperature range of -55°C to +150°C, validated per JEDEC standards. Its thermal resistance R_θJA = 625°C/W on FR-4 means ambient temperature must be limited to ≤+85°C at full 200mW dissipation to maintain T_J ≤150°C.

Is MMST4403-7-F pin-compatible with other SOT323 PNP transistors?

Yes - MMST4403-7-F uses standard SOT323 pinout (Emitter-Base-Collector, left-to-right top view), matching industry-standard footprints. Mechanical dimensions (2.15mm × 2.10mm × 0.95mm) and pad layout comply with JEDEC MO-203AA, ensuring direct PCB compatibility with BC807, MMBT3906, and similar SOT323 PNP devices.

Does MMST4403-7-F meet automotive qualification requirements?

The base MMST4403-7-F is not AEC-Q200 qualified, but Diodes offers automotive-grade variants with Q-suffix (e.g., MMST4403Q-7-F) manufactured in IATF 16949 facilities and tested to AEC-Q200 stress requirements. These qualify for under-hood and safety-critical applications.

How does the h_FE variation affect circuit design?

h_FE ranges from 30 to 300 depending on collector current (e.g., 30 at -500mA, 100 at -10mA), requiring bias networks tolerant of 10:1 gain spread. Designers should use emitter degeneration or feedback stabilization - especially in linear amplifiers - to avoid saturation or cutoff under process/voltage/temperature variation.

MMST4403-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SC-70, SOT-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

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):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 150mA, 2V

Power - Max:: 200 mW

Frequency - Transition:: 200MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

MMST4403-7-F FAQ

1.How can I place an order for MMST4403-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for MMST4403-7-F 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 MMST4403-7-F reliable?

The price and inventory of MMST4403-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMST4403-7-F is usually 5 days.

3.What payment methods are accepted for MMST4403-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMST4403-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMST4403-7-F?

MMST4403-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMST4403-7-F 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 MMST4403-7-F?

For technical support, including MMST4403-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMST4403-7-F requirements.

6.How does Aetrix verify that MMST4403-7-F is sourced from the original manufacturer or authorized distributors?

All MMST4403-7-F 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 MMST4403-7-F meets industry standards.

7.What is the process for return or replacement of MMST4403-7-F?

All MMST4403-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMST4403-7-F, 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 MMST4403-7-F part is unused and in its original packaging.

Return procedure for MMST4403-7-F:

1.Submit a request within 90 days.

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

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