Diodes Incorporated DMMT3906WQ-7-F

Overview

DMMT3906WQ-7-F from Diodes Incorporated is an AEC-Q101-qualified matched PNP transistor pair in SOT363 package, featuring BV_CEO = −40 V, I_C = −200 mA per device, 2% h_FE matching, and 2 mV V_BE matching. It serves as a precision current mirror or differential pair in automotive sensor signal conditioning circuits.

For engineers reviewing the DMMT3906WQ-7-F datasheet, DMMT3906WQ-7-F pinout, DMMT3906WQ-7-F application, or DMMT3906WQ-7-F equivalent, key selection criteria include matched h_FE tolerance, V_BE tracking under bias, thermal coupling in SOT363, and AEC-Q101 qualification for under-hood analog front-ends.

Technical Context

This dual PNP device integrates two adjacent die on a single silicon substrate to ensure intrinsic matching-enabling precise current mirroring and differential amplification without external trimming. Its matched h_FE (±2%) and V_BE (±2 mV) are specified at I_C = −2 mA, V_CE = −5 V, ensuring stability across temperature and process variation.

The SOT363 package provides fully isolated terminals with internal thermal coupling between transistors, supporting low-offset operation in instrumentation-grade analog blocks. Electrical isolation prevents cross-talk while maintaining tight parametric correlation critical for high-accuracy feedback paths.

Key Specifications

Pinout & Package

SOT363 is a 6-pin, surface-mount plastic package with gull-wing leads, measuring 2.15 mm × 2.10 mm × 1.00 mm. It features fully isolated internal die placement and matte tin terminations compliant with MIL-STD-202.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DMMT3906WQ-7-F, DMBT3906WQ-7-F offers polarity inversion without footprint change but requires redesign of bias networks, while ZXTD09N50DE6TA trades AEC-Q101 compliance and 2.5× looser matching for broader voltage range and lower unit cost in non-automotive contexts.

Availability

DMMT3906WQ-7-F is available at Aetrix Electronics and suitable for automotive engine control units, battery management systems, and ADAS sensor signal conditioning requiring stable component supply and AEC-Q101 traceability.

Supply support for DMMT3906WQ-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, specializing in high-reliability components for automotive, industrial, and computing markets.

The DMMT3906WQ-7-F belongs to Diodes' AEC-Q101-qualified matched transistor family, engineered specifically for precision analog functions in harsh automotive environments where parametric correlation and long-term stability are critical.

FAQ

What does the "Q" suffix in DMMT3906WQ-7-F signify?

The "Q" denotes AEC-Q101 qualification and PPAP capability. Unlike the standard DMMT3906W-7-F, this variant undergoes additional automotive-specific stress testing-including temperature cycling, high-temperature operating life, and ESD validation-and ships with full PPAP documentation for Tier 1 automotive suppliers.

Can DMMT3906WQ-7-F replace discrete PNP transistors in existing current mirror designs?

Yes, provided the original design uses two identical PNP transistors in close thermal proximity. The intrinsic die matching eliminates inter-device V_BE and h_FE variation, reducing mirror error from typical ±5–10% to ±0.5%, and improves thermal tracking due to monolithic integration in SOT363.

Is the SOT363 package thermally adequate for continuous 150 mA operation?

At I_C = −150 mA per device and T_A = +85°C, power dissipation is ~150 mW. With R_θJA = 625°C/W, junction rise is ~94°C, yielding T_J ≈ 179°C-exceeding the 150°C max rating. Derating to ≤100 mA or adding copper pour is required for sustained operation above 70°C ambient.

How does the 2 mV V_BE matching translate to input offset in a differential pair?

In a basic emitter-coupled pair biased at equal I_C, input offset voltage equals |V_BE1 − V_BE2|. With ±2 mV matching, worst-case offset is 4 mV-directly limiting resolution in sensor amplifiers. This matches the datasheet's typical V_OS spec for discrete-pair implementations using this device.