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

Diodes Incorporated MMBT3906-7-F

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

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Part No.:: MMBT3906-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

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

Datasheet:: MMBT3906-7-F.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-F from Diodes Incorporated is a 40V PNP small-signal transistor in SOT23 package, rated for -200 mA continuous collector current and -40 V collector-emitter voltage, with DC current gain (h_FE) of 60–300 at IC = -10 mA, used in medium-power switching and amplification circuits such as level-shifting stages in microcontroller I/O interfaces.

For engineers reviewing the MMBT3906-7-F datasheet, MMBT3906-7-F pinout, MMBT3906-7-F application, or MMBT3906-7-F equivalent, key selection criteria include verified PNP polarity, SOT23 mechanical compatibility, guaranteed -40 V V_CEO, -0.25 V V_CE(sat) at -10 mA/-1 mA drive, and JEDEC-compliant 4 kV HBM ESD rating.

Technical Context

This discrete PNP bipolar junction transistor employs epitaxial planar die construction for stable gain and low leakage. It operates across -55°C to +150°C, supports pulsed switching with 35 ns delay time and 225 ns storage time, and delivers f_T = 250 MHz under V_CE = -20 V, I_C = -10 mA conditions.

Its complementary NPN counterpart is MMBT3904; thermal resistance R_θJA is 403°C/W on minimum pad layout and 357°C/W on 15 mm × 15 mm copper. Cutoff currents are specified at -50 nA (ICEV, IEBO) with V_EB = -5 V and V_CE = -30 V.

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 (continuous)	-200 mA - Continuous collector current limit defining usable load-driving capability in DC/low-frequency switching.
h_FE @ I_C = -10 mA	60–300 - Confirmed DC current gain range enabling predictable base drive sizing for saturation control.
V_CE(sat) @ I_C/I_B = -10 mA/-1 mA	-0.25 V - Verified saturation voltage ensuring <250 mW power loss per switch event at rated current.
f_T	250 MHz - Measured transition frequency confirming suitability for RF preamp and high-speed digital switching up to ~100 MHz.
ESD HBM	4000 V - JEDEC Class 3A human-body-model rating supporting robust handling in manual assembly and bench testing.
P_D (SOT23, min pad)	310 mW - Maximum steady-state power dissipation limiting thermal design margin on standard FR4 PCBs.

Pinout & Package

Package: SOT23 - Surface-mount plastic package with 3-pin configuration, 0.008 g mass, UL 94V-0 flammability rating, and matte tin-plated leads solderable per MIL-STD-202 Method 208.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal in PNP operation	Connected to higher potential (e.g., V_CC) when used as high-side switch or active-load amplifier.
2 (Base)	Control input for minority-carrier injection	Requires negative bias relative to emitter to turn on; typical drive current -1 mA achieves full saturation at -10 mA collector load.
3 (Collector)	Output current path	Connected to load and ground reference; reverse-biased during cutoff to block -40 V maximum voltage.

Key Features

Feature	Design Value
Epitaxial planar die construction	Ensures consistent h_FE distribution and low parameter drift over temperature (-55°C to +150°C).
Complementary pairing with MMBT3904	Enables direct substitution in push-pull, differential pair, and totem-pole output stage designs without circuit redesign.
Green compound & lead-free compliance	Fully RoHS 3 (2015/863/EU) and halogen/antimony-free (<900 ppm Br, <900 ppm Cl, <1000 ppm Sb), meeting automotive and industrial environmental mandates.
JEDEC Level 1 moisture sensitivity	Allows indefinite floor life at ≤30°C/60% RH-no baking required prior to reflow soldering.

Applications

LED Driver Stage

Microcontroller I/O Interface

Use Scenario: Driving 20 mA indicator LEDs from 3.3 V or 5 V logic rails where sourcing current is not available.

IC Role / Device Role / Timing Role: PNP switch configured in common-emitter mode to sink LED current to ground while referenced to V_CC.

Use Value: Low V_CE(sat) (-0.25 V) minimizes voltage drop and power loss; h_FE ≥ 60 ensures reliable turn-on with ≤1 mA base drive from GPIO pins.

Use Scenario: Level-shifting between 1.8 V FPGA outputs and 5 V peripheral inputs requiring inverted logic translation.

IC Role / Device Role / Timing Role: Inverting buffer using fixed-base bias to convert low-voltage logic high to 5 V rail-referenced low signal.

Use Value: Guaranteed -40 V V_CEO and -6 V V_EBO prevent latch-up or damage during voltage transients; 250 MHz f_T supports clean edges up to 25 MHz clock rates.

Power Supply Enable Control

Discrete Op-Amp Input Stage

Use Scenario: Enabling/disabling a 12 V analog supply rail via microcontroller GPIO in battery-powered instrumentation.

IC Role / Device Role / Timing Role: High-side switch controlling V_IN to LDO regulator input, with emitter tied to 12 V and collector feeding downstream circuitry.

Use Value: -40 V V_CBO and -40 V V_CEO provide 2× safety margin against 12 V rail surges; R_θJA = 403°C/W enables thermal stability at 100 mA load.

Use Scenario: Building discrete differential input pairs in precision sensor front-ends where integrated op-amps lack required CMRR or offset specs.

IC Role / Device Role / Timing Role: Matched PNP pair (with MMBT3904) forming emitter-coupled amplifier core with controlled h_FE spread (±20% typical).

Use Value: h_FE variation bounded by datasheet min/max values (60–300) allows predictable bias current setting; low NF = 4.0 dB supports sub-10 µV noise performance at 100 µA collector bias.

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)	V_CEO = -45 V, h_FE = 250–600 @ I_C = -100 mA, SOT23 package, same pinout.	Higher gain and voltage rating support heavier loads but require adjusted base resistor for identical bias point.	Select when >250 mA peak current or tighter h_FE tolerance is needed; verify thermal derating at 350 mW P_D.
PN2907A (ON Semiconductor)	V_CEO = -60 V, I_C = -600 mA, TO-92 package, different footprint and thermal profile.	Through-hole mounting and higher power rating suit prototyping and low-volume industrial controls.	Choose for hand-soldered prototypes or legacy board replacements where SOT23 rework is impractical.

Compared with BC807-40 and PN2907A, MMBT3906-7-F offers optimal balance of SOT23 space efficiency, JEDEC-standardized ESD robustness (4 kV HBM), and production-ready green compliance-making it preferred for high-density consumer and automotive-qualified PCBs where footprint and RoHS adherence are critical.

Availability

MMBT3906-7-F is available at Aetrix Electronics and suitable for LED driver stages, microcontroller I/O interfaces, power supply enable control, and discrete op-amp input stages requiring stable component supply, consistent parametric performance, and full RoHS 3 compliance.

Supply support for MMBT3906-7-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.

The MMBT3906 belongs to Diodes' general-purpose small-signal transistor product line, engineered for cost-sensitive, high-volume applications in computing, consumer, and industrial systems where reliability, thermal stability, and environmental compliance are mandatory.

FAQ

What is the maximum operating temperature for MMBT3906-7-F?

The MMBT3906-7-F is rated for junction and storage temperatures from -55°C to +150°C. Its thermal resistance R_θJA is 403°C/W on minimum pad layout, meaning ambient temperature must be limited to ≤+85°C when dissipating 310 mW continuously to maintain T_J ≤ +150°C.

Is MMBT3906-7-F pin-compatible with MMBT3904?

No-MMBT3906-7-F (PNP) and MMBT3904 (NPN) share the SOT23 package and pinout (Emitter-Base-Collector = Pin 1-2-3), but polarity reversal means direct substitution requires circuit-level inversion of bias and load connections; they are complementary, not interchangeable.

Does MMBT3906-7-F meet automotive qualification standards?

The standard MMBT3906-7-F is not AEC-Q101 qualified; however, Diodes offers the automotive-grade variant MMBT3906Q, which undergoes additional stress testing and is documented in a separate datasheet (DS30059Q) with extended temperature screening and failure analysis reporting.

What is the typical noise figure for MMBT3906-7-F in amplifier configurations?

The MMBT3906-7-F has a typical noise figure of 4.0 dB at V_CE = -5.0 V, I_C = -100 µA, R_S = 1.0 kΩ, and f = 1.0 kHz. This value reflects its suitability for low-noise preamplifier stages in sensor signal conditioning, though optimal noise performance requires emitter degeneration and careful impedance matching.

MMBT3906-7-F 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:: Active

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-F FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBT3906-7-F?

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

Once your MMBT3906-7-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 MMBT3906-7-F?

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

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

All MMBT3906-7-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 MMBT3906-7-F meets industry standards.

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

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

Return procedure for MMBT3906-7-F:

1.Submit a request within 90 days.

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

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