Diodes Incorporated DMMT3904W-7-F-79

Overview

DMMT3904W-7-F-79 from Diodes Incorporated is an intrinsically matched dual NPN small-signal transistor in SOT-363 package, with 2% matching tolerance on h_FE, V_CE(SAT), and V_BE(SAT) at I_C = 10 mA, V_CE = 1.0 V; rated for 40 V V_CEO, 200 mA I_C, and 200 mW P_D; used in precision current mirror and differential pair circuits in analog front-ends.

For engineers reviewing the DMMT3904W-7-F-79 datasheet, DMMT3904W-7-F-79 pinout, DMMT3904W-7-F-79 application, or DMMT3904W-7-F-79 equivalent, key selection criteria include matched h_FE tolerance, low V_CE(SAT) at 10 mA/1 mA drive, thermal resistance (625 °C/W), dual-NPN symmetry, and SOT-363 footprint compatibility with high-density PCB layouts.

Technical Context

This device integrates two adjacent NPN transistors fabricated on a single silicon die to ensure intrinsic parameter matching-critical for current mirrors, active loads, and emitter-coupled logic where gain and saturation voltage tracking directly impact linearity and offset. Matching is specified at 1% (typical) and 2% (max) for h_FE, V_CE(SAT), and V_BE(SAT).

It operates across –55 °C to +150 °C, supports switching speeds with t_d/t_r ≤ 35 ns and t_f ≤ 50 ns under 10 mA load, and delivers f_T = 300 MHz at V_CE = 20 V, I_C = 10 mA-enabling stable performance in broadband bias networks and RF detector stages.

Key Specifications

Pinout & Package

SOT-363 (SC-70-6) surface-mount plastic package, UL 94V-0 rated, moisture sensitivity Level 1, 0.015 g mass, lead-free matte tin plating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar matched dual-NPN transistor applications.

Compared with DMMT3904W-7-F-79, DMBT3904W-7-F lacks die-level matching and requires external calibration, while NSVT3904DXV6T1G trades 2% matching and 300 MHz f_T for smaller SOT-563 size and higher V_CE(SAT)-making the DMMT3904W-7-F-79 optimal for precision analog and high-speed current-mode designs.

Availability

DMMT3904W-7-F-79 is available at Aetrix Electronics and suitable for precision analog front-ends, automotive cabin sensor interfaces, and industrial current-loop transmitters requiring stable component supply and guaranteed parameter matching.

Supply support for DMMT3904W-7-F-79 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, Malaysia, and Taiwan.

The DMMT3904W series belongs to Diodes' precision bipolar transistor product line, engineered specifically for applications demanding intrinsically matched parameters-such as current mirrors, differential amplifiers, and active load networks in high-reliability analog systems.

FAQ

What does "intrinsically matched" mean for DMMT3904W-7-F-79?

"Intrinsically matched" means both NPN transistors are fabricated side-by-side on the same silicon die, ensuring near-identical doping profiles, geometry, and thermal coupling. This yields guaranteed 2% matching for h_FE, V_CE(SAT), and V_BE(SAT) at I_C = 10 mA, V_CE = 1.0 V-critical for minimizing offset in current mirrors and differential pairs.

Can DMMT3904W-7-F-79 be used in place of a single 2N3904?

No-it is a dual-NPN matched pair in SOT-363, not a drop-in replacement for discrete 2N3904 in TO-92. Each transistor shares emitter/base/collector pins in a fixed 6-pin layout. Substitution requires PCB redesign to accommodate SOT-363 and verify that both transistors are utilized per circuit function (e.g., current mirror, not standalone switching).

Is the -F suffix in DMMT3904W-7-F-79 related to lead-free compliance?

Yes-the "-F" suffix denotes lead-free terminal finish (matte tin), compliant with RoHS and JEDEC J-STD-020A solderability requirements. The "-79" suffix indicates tape-and-reel packaging with 3000 units per reel, consistent with Diodes' standard ordering code structure for SOT-363 devices.

How does thermal resistance affect real-world operation?

With R_JA = 625 °C/W on a standard FR5 PCB (per AP02001 layout), dissipating 100 mW raises junction temperature by 62.5 °C above ambient. At 85 °C ambient, T_J reaches 147.5 °C-within the –55 to +150 °C rating but approaching limit. Derating is required above 70 °C ambient for sustained 200 mW operation.