Diodes Incorporated MMDT5451-7-F

Overview

MMDT5451-7-F from Diodes Incorporated is a complementary NPN/PNP small-signal transistor pair in a single SOT-363 package, featuring 160 V V_CEO (NPN), −150 V V_CEO (PNP), 200 mA I_C, f_T up to 300 MHz, and AEC-Q101 qualification for automotive reliability. It serves as a compact dual-transistor solution for medium-power amplification and switching in space-constrained analog and power-control circuits.

For engineers reviewing the MMDT5451-7-F datasheet, MMDT5451-7-F pinout, MMDT5451-7-F application, or MMDT5451-7-F equivalent, key selection criteria include complementary high-voltage breakdown ratings, matched h_FE ranges across both transistors, thermal resistance (R_θJA = 390 °C/W on 2 oz copper), and RoHS/Green compliance for automotive-grade production.

Technical Context

This dual-transistor device integrates an NPN type matching the 2N5551 (180 V V_CBO, h_FE = 80–250 at I_C = 10 mA) and a PNP type matching the 2N5401 (−160 V V_CBO, h_FE = 60–240 at I_C = −10 mA) in one thermally coupled SOT-363 package. Both devices share identical output capacitance (C_obo ≤ 6.0 pF) and noise figure (NF ≤ 8.0 dB).

The structure enables push-pull amplifier stages and complementary switching without inter-device layout mismatch. Its 0.006 g mass and UL 94V-0 molding compound support lightweight, flame-retardant PCB designs meeting automotive environmental requirements.

Key Specifications

Pinout & Package

Package: SOT-363 (6-pin, ultra-small surface-mount plastic case; 2.15 mm × 2.10 mm × 0.95 mm; 0.006 g; matte tin terminals; moisture sensitivity level 1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar complementary transistor pair applications.

Compared with DMBT3904-7-F and NSVT5401HT1G, MMDT5451-7-F uniquely delivers matched high-voltage NPN/PNP characteristics in one thermally coupled package-enabling precise complementary operation without inter-device timing skew or thermal mismatch.

Availability

MMDT5451-7-F is available at Aetrix Electronics and suitable for automotive LED drivers, industrial relay interfaces, audio preamplifiers, and isolated power supply feedback loops requiring stable component supply and AEC-Q101 assurance.

Supply support for MMDT5451-7-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 MMDT5451-7-F belongs to Diodes' AEC-Q101-qualified small-signal transistor portfolio, engineered specifically for automotive and industrial applications demanding high-voltage tolerance, thermal stability, and green material compliance.

FAQ

What is the maximum operating temperature for MMDT5451-7-F?

The MMDT5451-7-F has a specified operating junction temperature range of −55 °C to +150 °C, validated per AEC-Q101 stress testing. Its R_θJA of 390 °C/W (on 2 oz copper) means that at 320 mW dissipation, junction temperature rises ~125 °C above ambient-so maximum ambient must be limited to +25 °C for full-rated operation.

Can MMDT5451-7-F replace discrete 2N5551 and 2N5401 transistors?

Yes-it electrically matches the 2N5551 (NPN) and 2N5401 (PNP) in breakdown voltage, gain, and switching speed, and integrates them into one SOT-363 package. However, layout must account for shared thermal mass and fixed pinout (B1/C1/E1/B2/C2/E2), unlike independent TO-92 placements.

Is MMDT5451-7-F suitable for high-frequency RF amplification?

No. Though f_T reaches 300 MHz, its noise figure (8.0 dB) and lack of RF-specific characterization (e.g., S-parameters, gain flatness, or input/output impedance data) limit use to audio and low-speed switching-not RF signal chains above 30 MHz.

Does the "-7-F" suffix indicate tape-and-reel packaging?

Yes. The "-7-F" suffix denotes 7-inch reel, 8 mm tape width, and 3,000-unit quantity per reel, with RoHS-compliant (lead-free, halogen-free) finish and AEC-Q101 qualification marked as "KNM" on the device top.