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

Diodes Incorporated MMBT3906-7

Name: MMBT3906-7
Brand: Diodes Incorporated
SKU: MMBT3906-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBT3906-7

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: MMBT3906-7.pdf

Description:: TRANS PNP 40V 0.2A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MMBT3906-7 from Diodes Incorporated is a PNP small-signal surface-mount transistor in SOT-23 package, rated for -40 V V_CEO, -200 mA I_C, and 300 mW P_D; used for medium-power switching and amplification in discrete bias networks, level shifters, and LED driver stages.

For engineers reviewing the MMBT3906-7 datasheet, MMBT3906-7 pinout, MMBT3906-7 application, or MMBT3906-7 equivalent, key selection criteria include verified V_CE(SAT) ≤ -0.4 V at I_C = -50 mA/I_B = -5 mA, h_FE range of 60–300 across I_C = -100 µA to -100 mA, and thermal resistance R_JA = 417 °C/W on FR-4 PCB.

Technical Context

This PNP bipolar junction transistor employs epitaxial planar die construction for stable gain and low leakage. It operates with V_EBO = -5.0 V and exhibits f_T = 250 MHz at V_CE = -20 V, I_C = -10 mA, enabling use in audio-frequency amplifiers and fast-switching logic interfaces.

Its complementary NPN counterpart is the MMBT3904; both share identical SOT-23 mechanical dimensions and thermal derating profile. Cutoff currents (I_CBO, I_CEX) are specified ≤ -50 nA at -30 V bias, supporting reliable operation in low-leakage bias chains.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-40 V - maximum safe collector-emitter reverse voltage before breakdown in common-emitter configuration
I_C (cont.)	-200 mA - continuous DC collector current rating defining switching load capacity
P_D	300 mW - power dissipation limit at T_A = 25°C on standard FR-4 PCB per AP02001 layout
h_FE	60–300 - DC current gain range across I_C = -100 µA to -100 mA, critical for bias stability
V_CE(SAT)	-0.25 to -0.40 V - saturation voltage at I_C/I_B = -10 mA/-1 mA and -50 mA/-5 mA, determining conduction loss
f_T	250 MHz - transition frequency indicating usable bandwidth in small-signal amplification
R_JA	417 °C/W - junction-to-ambient thermal resistance under defined PCB mounting conditions

Pinout & Package

Package: SOT-23 - surface-mount plastic case, UL 94V-0 rated, moisture sensitivity Level 1, 0.008 g weight.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current source terminal in PNP operation	Connected to higher potential rail; defines reference for base control and current sourcing path
2 (Base)	Control input for minority-carrier injection	Receives negative bias relative to emitter to enable conduction; requires current-limited drive
3 (Collector)	Current sink terminal in PNP operation	Connected to load and lower-potential node; carries switched/sourced current to ground or return path

Key Features

Feature	Design Value
Complementary pairing	Matched performance with MMBT3904 (NPN) for push-pull and differential designs
Lead-free plating option	Matte tin finish available (suffix -F); compliant with RoHS and JEDEC J-STD-020A
Low saturation voltage	V_CE(SAT) ≤ -0.40 V ensures < 0.5 V drop in high-side switch applications
High f_T	250 MHz enables use in >100 kHz PWM drivers and audio preamplifier stages
Stable h_FE over temperature	Gain maintained across -55°C to +150°C operating range per Fig. 3

Applications

LED Driver Stage

Level Shifter Interface

Use Scenario: Driving 20 mA red/green LEDs from 3.3 V microcontroller GPIOs with active-high logic.

IC Role / Device Role / Timing Role: PNP switch sourcing current from V_CC to LED anode; base driven by inverted MCU output.

Use Value: V_CE(SAT) ≤ -0.40 V limits LED series resistor power loss; h_FE ≥ 60 ensures full turn-on with ≤ 0.33 mA base drive.

Use Scenario: Translating 1.8 V logic signals to 5 V domains in mixed-voltage digital systems.

IC Role / Device Role / Timing Role: Discrete level shifter using emitter-follower or common-emitter inverter topology.

Use Value: f_T = 250 MHz supports clean edge transitions up to ~10 MHz; low C_obo = 4.5 pF minimizes capacitive loading on source side.

Discrete Bias Network

Audio Preamp Stage

Use Scenario: Setting quiescent current in Class-A amplifier stages or op-amp input bias circuits.

IC Role / Device Role / Timing Role: Current source/sink element establishing stable DC operating point for active devices.

Use Value: I_CBO ≤ -50 nA ensures negligible drift over temperature; h_FE tolerance supports predictable current mirroring.

Use Scenario: Low-noise voltage amplification in microphone preamplifier inputs (20 Hz–20 kHz).

IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with emitter degeneration and bypassed emitter resistor.

Use Value: NF = 4.0 dB at I_C = -100 µA enables SNR preservation; h_fe = 100–400 provides sufficient gain margin without instability.

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
PN2907A	TO-92 package; higher R_JA (~200 °C/W), lower f_T (~100 MHz)	Not suitable for high-density SMT layouts; limited bandwidth for fast switching	Select when through-hole assembly or legacy footprint compatibility is required
BC807-40	SOT-23 package; h_FE min = 250 (vs. 60–300), V_CEO = -45 V	Better gain consistency but tighter h_FE binning increases cost; higher voltage margin unused in 3.3/5 V systems	Select when guaranteed high h_FE is needed for low-base-drive designs

Compared with PN2907A and BC807-40, the MMBT3906-7 offers optimal balance of SMT compatibility, moderate gain spread, and proven thermal performance on standard FR-4 layouts-making it preferred for cost-sensitive, space-constrained switching and amplification where design flexibility matters more than extreme gain uniformity or voltage headroom.

Availability

MMBT3906-7 is available at Aetrix Electronics and suitable for LED driver stages, level shifter interfaces, and discrete bias networks requiring stable component supply and consistent SOT-23 form factor.

Supply support for MMBT3906-7 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 centers across Asia and manufacturing in China, Taiwan, and the US.

The MMBT3906-7 belongs to Diodes' general-purpose small-signal transistor product line, engineered for reliability in consumer, industrial, and computing applications where proven performance, SMT scalability, and RoHS compliance are essential.

FAQ

Is MMBT3906-7 lead-free and RoHS compliant?

Yes, the standard MMBT3906-7 uses matte tin lead-free plating and meets RoHS Directive 2011/65/EU requirements. The lead-free version is explicitly designated with suffix "-F" (e.g., MMBT3906-7-F), and packaging documentation confirms J-STD-020A Level 1 moisture sensitivity.

What is the maximum allowable junction temperature for continuous operation?

The absolute maximum junction temperature is +150°C, with storage temperature also rated from –55°C to +150°C. Derating begins above +25°C ambient per Fig. 1: power dissipation drops linearly to zero at +150°C ambient on standard FR-4 PCB.

Can MMBT3906-7 be used in linear amplifier configurations?

Yes-it is characterized for small-signal amplification with h_fe = 100–400, NF = 4.0 dB, and h_ie = 2.0–12 kΩ. Stable operation requires proper emitter degeneration and thermal management; DC bias must stay within V_CE ≤ –40 V and I_C ≤ –200 mA limits.

How does the marking "K3N" correspond to the part number?

"K3N" is the top-side laser marking code for MMBT3906-7 per Diodes Inc. specification DS30059. "K3" identifies the device type and process; "N" indicates 2002 calendar year (per date code table). Full traceability is maintained via reel labels and shipping documentation.

MMBT3906-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

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:: 400mV @ 5mA, 50mA

Current - Collector Cutoff (Max):: -

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

Power - Max:: 300 mW

Frequency - Transition:: 250MHz

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

MMBT3906-7 FAQ

1.How can I place an order for MMBT3906-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBT3906-7 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 MMBT3906-7 reliable?

The price and inventory of MMBT3906-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBT3906-7 is usually 5 days.

3.What payment methods are accepted for MMBT3906-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT3906-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBT3906-7?

MMBT3906-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBT3906-7 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 MMBT3906-7?

For technical support, including MMBT3906-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT3906-7 requirements.

6.How does Aetrix verify that MMBT3906-7 is sourced from the original manufacturer or authorized distributors?

All MMBT3906-7 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 MMBT3906-7 meets industry standards.

7.What is the process for return or replacement of MMBT3906-7?

All MMBT3906-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBT3906-7, 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 MMBT3906-7 part is unused and in its original packaging.

Return procedure for MMBT3906-7:

1.Submit a request within 90 days.

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

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