Diodes Incorporated MMDT5401-7-F

Overview

MMDT5401-7-F from Diodes Incorporated is a dual PNP small-signal transistor in SOT363 package, rated for -150 V V_CEO, -200 mA I_C, and 200 mW power dissipation. It delivers h_FE = 60–240 at -10 mA/-5 V and f_T up to 300 MHz, serving as a medium-power switching and amplification device in compact DC-DC bias networks and discrete logic interfaces.

For engineers reviewing the MMDT5401-7-F datasheet, MMDT5401-7-F pinout, MMDT5401-7-F application, or MMDT5401-7-F equivalent, key selection criteria include complementary NPN pairing (MMDT5551), thermal resistance (R_θJA = 625 °C/W on 1 oz FR-4), ultra-small SOT363 footprint, and automotive-grade variant availability (MMDT5401Q).

Technical Context

This dual PNP transistor uses epitaxial planar die construction for stable gain and low leakage. Its -150 V V_CEO and -160 V V_CBO support high-voltage biasing in flyback snubbers and level-shifting circuits, while its 100–300 MHz f_T enables RF preamplifier and oscillator buffer use up to VHF band.

Designed for surface-mount assembly, it features matte tin terminals solderable per MIL-STD-202 Method 208 and moisture sensitivity Level 1 per J-STD-020. The SOT363 package integrates two isolated PNP transistors sharing no internal connection - each with independent C/E/B terminals.

Key Specifications

Pinout & Package

Package: SOT363 - ultra-small 6-pin surface-mount package (2.15 mm × 2.10 mm × 0.95 mm), molded green plastic, UL 94V-0 rated, 0.006 g weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT5401-7-F and BC847BPDW1T3G, the MMDT5401-7-F uniquely combines dual-channel integration, -150 V rating, and automotive-qualified variant (MMDT5401Q), making it optimal for space-constrained, high-reliability bias and interface designs where voltage headroom and channel density are jointly critical.

Availability

MMDT5401-7-F is available at Aetrix Electronics and suitable for high-voltage bias networks, discrete logic interfaces, dual-channel current mirrors, and RF oscillator buffers requiring stable component supply and long-term manufacturability.

Supply support for MMDT5401-7-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 MMDT5401 belongs to Diodes' small-signal transistor product line, engineered for reliable medium-power amplification and switching in space-constrained industrial, computing, and communications equipment.

FAQ

What is the maximum junction temperature for MMDT5401-7-F?

The MMDT5401-7-F has an operating junction temperature range of -55°C to +150°C. Its thermal resistance R_θJA is 625°C/W on standard 1 oz FR-4 PCB, meaning a 200 mW dissipation raises junction temperature by 125°C above ambient - limiting safe continuous operation to ≤25°C ambient unless heatsinking or airflow is added.

Is MMDT5401-7-F pin-compatible with MMDT5551?

No - MMDT5401-7-F (dual PNP) and MMDT5551 (dual NPN) share identical SOT363 pinout (C1/E1/B1/C2/E2/B2), enabling direct PCB layout reuse in complementary designs, but polarity reversal means external circuit connections must be mirrored - e.g., collectors connect to positive rails for NPN vs. negative rails for PNP.

Does MMDT5401-7-F support automotive applications?

Yes - the automotive-qualified version is MMDT5401Q, qualified to AEC-Q101 with extended temperature testing (-40°C to +125°C), enhanced ESD robustness, and PPAP documentation. The standard MMDT5401-7-F is not AEC-Q101 certified and should not be used in safety-critical automotive systems without additional qualification.

How does the SOT363 package affect thermal performance compared to SOT23?

SOT363's dual-transistor layout increases total power dissipation capability versus single-SOT23, but its smaller pad area and shared thermal mass reduce R_θJA efficiency: 625°C/W (SOT363, 1 oz FR-4) vs. ~400°C/W for single SOT23 equivalents. Layout optimization - including copper pour under the exposed pad (if present) and thermal vias - is essential to manage junction temperature in continuous operation.