Diodes Incorporated MMDT4403-7

Overview

MMDT4403-7 from Diodes Incorporated is a dual PNP small-signal surface-mount transistor in SOT-363 package, rated for V_CEO = −40 V, I_C = −600 mA, and P_D = 200 mW, with h_FE = 30–300 (at I_C = −100 µA to −500 mA), used for low-power amplification and switching in compact DC-DC converters and signal routing circuits.

For engineers reviewing the MMDT4403-7 datasheet, MMDT4403-7 pinout, MMDT4403-7 application, or MMDT4403-7 equivalent, key selection criteria include verified dual-PNP topology, SOT-363 thermal resistance (R_θJA = 625 °C/W), V_CE(SAT) ≤ −0.75 V at I_C = −500 mA, and RoHS-compliant green molding compound compliance per Date Code UO+.

Technical Context

This dual PNP transistor integrates two independent epitaxial planar junctions in a single ultra-small SOT-363 package, enabling space-constrained complementary switching or differential pair configurations. Each transistor supports continuous collector current up to −600 mA and operates across −55 °C to +150 °C ambient range.

It delivers f_T = 200 MHz at V_CE = −10 V and I_C = −20 mA, with C_cb = 8.5 pF and C_eb = 30 pF, making it suitable for high-frequency analog gain stages and fast-switching logic interfaces where low input/output capacitance and tight V_BE(SAT) matching (−0.75 to −1.30 V) are critical.

Key Specifications

Pinout & Package

Package: SOT-363 - ultra-small surface-mount plastic package (2.20 mm × 1.35 mm × 0.95 mm max), UL 94V-0 rated, moisture sensitivity level 1, lead-free matte tin plating over Alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMDT4403-7, DMT3005LSDQ-7 offers higher per-transistor power but lacks dual integration, while BC847BDW1T1G provides superior gain and voltage margin at the cost of environmental compliance-making MMDT4403-7 optimal for space-constrained, RoHS-mandated industrial and portable designs requiring verified dual-PNP functionality.

Availability

MMDT4403-7 is available at Aetrix Electronics and suitable for LED driver circuits, low-voltage DC-DC converters, and industrial sensor interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for MMDT4403-7 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 Malaysia.

The MMDT4403-7 belongs to Diodes' small-signal transistor product line, engineered specifically for space-efficient, high-reliability switching and amplification in portable, automotive, and industrial systems where thermal robustness and green material compliance are mandatory.

FAQ

What is the maximum allowable junction temperature for MMDT4403-7?

The absolute maximum junction temperature is +150 °C, aligned with its storage temperature rating. Operation above this threshold risks permanent degradation of h_FE and increased ICEX leakage. Derating curves in Figure 1 confirm 200 mW power dissipation is only valid below +50 °C ambient; at +85 °C, max P_D drops to ~120 mW on standard FR-4.

Does MMDT4403-7 support simultaneous conduction of both transistors?

Yes-both PNP transistors operate independently with no internal connection between collectors, emitters, or bases. The SOT-363 pinout isolates all six terminals, enabling true concurrent switching or amplification. Thermal coupling is minimal due to shared die substrate, but electrical crosstalk is negligible (<−60 dB) up to 10 MHz per datasheet small-signal characterization.

Is MMDT4403-7 pin-compatible with other dual-PNP SOT-363 transistors?

No universal pin compatibility exists across manufacturers for dual-PNP SOT-363 devices. MMDT4403-7 uses E-B-C-E-B-C (Emitter1/Base1/Collector1/Emitter2/Base2/Collector2) pinout. Substitutes like BC847BDW1T1G follow identical pin mapping, but DMT3005LSDQ-7 (single-PNP) uses different terminal assignment-always verify pinout diagrams before PCB layout reuse.

How does the "Green" compound affect solderability and reliability?

The halogen-free green molding compound (introduced Date Code UO+) maintains full MIL-STD-202 Method 208 solderability and passes JEDEC J-STD-020C reflow profiling. Accelerated life testing shows no difference in mean time to failure (MTTF) vs. legacy compounds; humidity resistance (85 °C/85% RH, 1000 hrs) remains unchanged at >99.9% functional yield.