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

Diodes Incorporated MMST3906-7

Name: MMST3906-7
Brand: Diodes Incorporated
SKU: MMST3906-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMST3906-7

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: MMST3906-7.pdf

Description:: TRANS PNP 40V 0.2A SOT-323

Quantity:: RFQ Add To RFQ list

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Inventory:8,603

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Product details

Overview

MMST3906-7 from Diodes Incorporated is a PNP small-signal surface-mount transistor in SOT-323 package, rated for -40 V V_CEO, -200 mA I_C, and 200 mW P_D, used for general-purpose switching and amplification in space-constrained analog and digital interface circuits.

For engineers reviewing the MMST3906-7 datasheet, MMST3906-7 pinout, MMST3906-7 application, or MMST3906-7 equivalent, key selection criteria include verified PNP polarity, SOT-323 footprint compatibility, h_FE range (60–300 at I_C = -100 µA to -100 mA), V_CE(SAT) ≤ -0.30 V, and thermal resistance R_JA = 625 K/W on FR-4 PCB.

Technical Context

This epitaxial planar PNP transistor operates with base-emitter forward bias enabling current-controlled conduction between emitter and collector. Its complementary NPN counterpart is the MMST3904, supporting push-pull or differential pair configurations.

Designed for low-power linear amplification and digital switching, it delivers f_T = 300 MHz at V_CE = -20 V and I_C = -10 mA, with C_ibo = 10 pF and C_obo = 4.5 pF at specified bias conditions, ensuring predictable high-frequency behavior in signal conditioning stages.

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 (max)	-200 mA - Continuous DC collector current limit defining switching/amplification headroom
P_D	200 mW - Power dissipation limit on standard FR-4 PCB, constraining thermal design margin
h_FE	60–300 - DC current gain range across I_C = -100 µA to -100 mA, critical for bias stability
V_CE(SAT)	-0.20 to -0.30 V - Saturation voltage at I_C/I_B = 10, directly impacting switch efficiency and power loss
f_T	300 MHz - Transition frequency indicating usable bandwidth for RF or fast-switching applications
R_JA	625 K/W - Junction-to-ambient thermal resistance under defined PCB layout, guiding heatsinking needs

Pinout & Package

Package: SOT-323 - ultra-small surface-mount plastic case (2.00–2.20 mm length × 1.15–1.35 mm width × 0.25–0.40 mm height), UL 94V-0 rated, moisture sensitivity Level 1, lead-free plating optional (-F suffix).

Pin/Terminal	Circuit Role	Design Meaning
Emitter (E)	Current source terminal in PNP operation	Connected to higher potential; defines reference for base control and current flow direction
Base (B)	Control electrode for minority-carrier injection	Receives reverse-biased current to modulate collector-emitter conduction
Collector (C)	Current sink terminal in PNP operation	Typically tied to load or lower potential; carries amplified output current

Key Features

Feature	Design Value
Complementary pairing	Matched performance with MMST3904 NPN for balanced differential or push-pull designs
Ultra-small footprint	SOT-323 package enables high-density routing in portable and wearable electronics
Lead-free option	-F suffix variant meets RoHS and JEDEC J-STD-020A Level 1 reflow requirements
High f_T / low capacitance	300 MHz f_T with C_ibo = 10 pF supports audio and low-MHz signal amplification

Applications

LED Driver Circuit

Level-Shifting Interface

Use Scenario: Driving low-current indicator LEDs from microcontroller GPIO pins with active-low logic.

IC Role / Device Role / Timing Role: PNP switch controlling LED anode connection to V_CC while sinking base current from MCU output.

Use Value: V_CE(SAT) ≤ -0.30 V ensures minimal voltage drop across transistor, preserving LED forward voltage margin.

Use Scenario: Translating 3.3 V logic signals to 5 V domains in mixed-voltage systems.

IC Role / Device Role / Timing Role: PNP-based level shifter providing bidirectional or unidirectional voltage translation without external pull-ups.

Use Value: h_FE ≥ 60 at I_C = -1 mA guarantees reliable turn-on with low base drive current.

Low-Power Amplifier Stage

Power Supply Enable Switch

Use Scenario: Small-signal preamplification of sensor outputs in battery-powered IoT nodes.

IC Role / Device Role / Timing Role: Common-emitter amplifier configured for voltage gain with emitter degeneration.

Use Value: f_T = 300 MHz and NF = 4.0 dB support clean amplification up to mid-audio frequencies.

Use Scenario: Enabling/disabling auxiliary rails (e.g., 3.3 V LDO) via microcontroller control in embedded power management.

IC Role / Device Role / Timing Role: High-side switch placing load between V_IN and output, controlled by grounded base.

Use Value: V_CEO = -40 V and I_C = -200 mA allow safe operation across industrial 24 V supply margins.

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
BC807-40,115 (Nexperia)	SOT-23 package; h_FE = 250–600 at I_C = -100 mA; V_CEO = -45 V	Larger footprint; higher gain consistency at medium currents	Preferred when board area permits and tighter h_FE tolerance is required
PN2907A (ON Semiconductor)	TO-92 through-hole; V_CEO = -60 V; P_D = 400 mW; R_JA ≈ 200 K/W	Not surface-mount; higher power handling but incompatible with automated SMT assembly	Select only for prototyping or legacy through-hole designs requiring higher voltage margin

Compared with BC807-40,115 and PN2907A, the MMST3906-7 offers optimal trade-off of ultra-compact SOT-323 size, verified -40 V rating, and sufficient h_FE spread for cost-sensitive consumer and industrial control boards where PCB real estate is constrained.

Availability

MMST3906-7 is available at Aetrix Electronics and suitable for LED driver circuits, level-shifting interfaces, low-power amplifier stages, and power supply enable switches requiring stable component supply and consistent SMT manufacturability.

Supply support for MMST3906-7 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, specializing in high-reliability, high-volume components for industrial, computing, and consumer markets.

The MMST3906-7 belongs to Diodes' small-signal transistor product line, engineered for precision switching and amplification in space-limited applications where thermal performance and footprint scalability are critical.

FAQ

What is the maximum operating temperature for MMST3906-7?

The MMST3906-7 has a specified junction and storage temperature range of -55 °C to +150 °C. Its thermal resistance R_JA = 625 K/W applies to a standard FR-4 PCB layout per AP02001; actual max ambient temperature depends on power dissipation and board-level cooling.

Is MMST3906-7 pin-compatible with MMST3904?

No - MMST3906-7 (PNP) and MMST3904 (NPN) share identical SOT-323 pinout (E-B-C), but polarity reversal means direct substitution requires circuit topology changes, including reversed biasing and load placement.

Does MMST3906-7 support lead-free reflow soldering?

Yes - the standard MMST3906-7 uses matte tin lead-free plating and is qualified for Pb-free reflow per JEDEC J-STD-020A Level 1. The -F suffix denotes explicit lead-free compliance, though both versions meet RoHS requirements.

How does h_FE vary with collector current in MMST3906-7?

h_FE ranges from 60 at I_C = -100 µA to 300 at I_C = -10 mA, then drops to 30 at I_C = -100 mA. This nonlinearity must be accounted for in bias networks; Figure 3 in DS30079 shows full I_C vs. h_FE curves across -25 °C to +125 °C.

MMST3906-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 200 mA

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

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 5mA, 50mA

Current - Collector Cutoff (Max):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 10mA, 1V

Power - Max:: 200 mW

Frequency - Transition:: 300MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

MMST3906-7 FAQ

1.How can I place an order for MMST3906-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for MMST3906-7 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 MMST3906-7 reliable?

The price and inventory of MMST3906-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMST3906-7 is usually 5 days.

3.What payment methods are accepted for MMST3906-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMST3906-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMST3906-7?

MMST3906-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMST3906-7 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 MMST3906-7?

For technical support, including MMST3906-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMST3906-7 requirements.

6.How does Aetrix verify that MMST3906-7 is sourced from the original manufacturer or authorized distributors?

All MMST3906-7 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 MMST3906-7 meets industry standards.

7.What is the process for return or replacement of MMST3906-7?

All MMST3906-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMST3906-7, 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 MMST3906-7 part is unused and in its original packaging.

Return procedure for MMST3906-7:

1.Submit a request within 90 days.

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

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