Diodes Incorporated MMDT3906-7-F

Overview

MMDT3906-7-F from Diodes Incorporated is a dual PNP small-signal transistor in SOT363 package, rated for -40V V_CEO, -200mA I_C, and 200mW power dissipation. It features epitaxial planar die construction, AEC-Q101 qualification, and is optimized for medium-power amplification and switching in automotive and industrial control circuits.

For engineers reviewing the MMDT3906-7-F datasheet, MMDT3906-7-F pinout, MMDT3906-7-F application, or MMDT3906-7-F equivalent, key selection criteria include guaranteed h_FE (60–300 at I_C = -100µA to -100mA), low V_CE(SAT) (-0.25V typ. at I_C = -10mA/I_B = -1mA), ESD robustness (4kV HBM), and dual-transistor integration in ultra-small SOT363.

Technical Context

This dual PNP transistor uses epitaxial planar die construction for stable gain and low leakage. Its complementary pairing with MMDT3904 enables push-pull and differential amplifier topologies, while AEC-Q101 qualification confirms suitability for automotive ambient temperature ranges (-55°C to +150°C) and reliability under thermal cycling.

Electrical behavior is defined by pulsed measurements (≤300µs, ≤2% duty cycle) for BV_CEO, h_FE, and switching parameters. Small-signal characteristics include f_T = 250MHz, C_IBO = 10pF, and NF = 4.0dB at 1kHz - supporting high-frequency biasing and low-noise preamplifier stages.

Key Specifications

Pinout & Package

SOT363 is a 6-pin ultra-small surface-mount package with dual PNP transistors sharing emitter connections (pins 1 & 2 for Q1 emitter, pins 5 & 6 for Q2 emitter), enabling compact dual-channel designs. The package meets UL 94V-0 flammability and J-STD-020 Level 1 moisture sensitivity requirements.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual PNP transistor applications.

Compared with DMTC3906LW-7 and BC856B,215, MMDT3906-7-F uniquely balances AEC-Q101 compliance, -200mA current drive, and broad h_FE range - making it optimal for cost-sensitive automotive body electronics where both reliability and medium-power switching are required.

Availability

MMDT3906-7-F is available at Aetrix Electronics and suitable for automotive door modules, industrial PLC output stages, consumer audio bias networks, and medical sensor signal conditioning requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for MMDT3906-7-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, manufacturing, and sales operations across Asia, Europe, and North America.

The MMDT3906-7-F belongs to Diodes' AEC-Q101-qualified small-signal transistor product line, engineered specifically for automotive body electronics and industrial control applications demanding high reliability in compact SMT packages.

FAQ

What is the maximum continuous collector current for MMDT3906-7-F?

The absolute maximum continuous collector current is -200mA per transistor, specified at T_A = +25°C with derating above 25°C per the thermal curve in Figure 1. At 100°C ambient, the usable I_C drops to approximately -120mA due to 200mW power limit and 625°C/W R_θJA.

Is MMDT3906-7-F pin-compatible with MMDT3904-7-F?

No - MMDT3906-7-F (dual PNP) and MMDT3904-7-F (dual NPN) share the same SOT363 pinout but opposite polarity. Pin 1/2 are emitters for both, but base/collector assignments require circuit-level inversion; they are complementary, not drop-in replacements.

Does MMDT3906-7-F support lead-free reflow soldering?

Yes - it features matte tin terminations qualified to MIL-STD-202 Method 208 and is compatible with standard Pb-free reflow profiles (peak 260°C). The package is fully RoHS-compliant and halogen-free, meeting JEDEC J-STD-020 Level 1 moisture sensitivity without bake requirements.

How does the dual-emitter configuration (Pins 1&2, 5&6) affect PCB layout?

The duplicated emitter pins reduce bond wire inductance and improve current sharing, allowing direct fan-out routing to separate ground planes or thermal pads. Layout best practice is to connect both emitter pins to the same low-impedance node - splitting them degrades matching and increases thermal resistance by up to 15%.