Diodes Incorporated DJT4031N-13

Overview

DJT4031N from Diodes Incorporated is a low V_CE(SAT) NPN surface-mount transistor in SOT-223 package, rated for 40 V V_CEO, 3 A continuous collector current, and 100 mV typical saturation voltage at I_C = 0.5 A / I_B = 5 mA. It serves as a medium-power switching or linear amplification device in DC-DC converters, motor drivers, and load-switching circuits.

For engineers reviewing the DJT4031N datasheet, DJT4031N pinout, DJT4031N application, or DJT4031N equivalent, key selection criteria include verified V_CE(SAT) performance at high I_C, thermal resistance under defined PCB layouts (62.5 °C/W with 1 in² copper), h_FE stability across temperature (−55 to +150 °C), and RoHS-compliant lead-free plating.

Technical Context

This NPN bipolar junction transistor operates in active or saturation mode with DC current gain (h_FE) ranging from 100 at 3 A to 500 at 100 mA, enabling precise base-driven switching control. Its low 100 mΩ equivalent on-resistance (R_CE(SAT)) and 1.0 V V_BE(SAT) at 1 A support efficient power-stage conduction with minimal drive overhead.

Thermal design is constrained by dual R_θJA ratings: 104 °C/W on minimal FR-4 pad layout and 62.5 °C/W with 1 in² copper pour-directly impacting maximum sustained power dissipation (1.2 W vs. 2.0 W). Switching times (t_on = 45 ns, t_off = 276 ns) reflect optimized charge storage for medium-speed digital and PWM applications.

Key Specifications

Pinout & Package

Package: SOT-223 - Surface-mount plastic package with exposed thermal pad (pin 2 and 4 internally connected to collector), rated for 1.2 W (min pad) to 2.0 W (1 in² copper), UL 94V-0 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN medium-power switching applications.

Compared with ZXTN2012ZTA and MJD44H11RLG, DJT4031N uniquely balances 3 A current capability, ultra-low 150 mV V_CE(SAT), and SOT-223 thermal pad integration-making it optimal for compact, thermally demanding medium-power SMT switching.

Availability

DJT4031N-13 is available at Aetrix Electronics and suitable for DC-DC converters, motor drivers, industrial PLC outputs, and LED load switching requiring stable component supply and RoHS-compliant manufacturing.

Supply support for DJT4031N-13 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 the Americas.

DJT4031N belongs to Diodes' general-purpose power transistor product line, engineered for cost-effective, high-reliability medium-power switching in industrial, computing, and consumer power supplies.

FAQ

What is the maximum allowable junction temperature for DJT4031N?

The DJT4031N has an absolute maximum junction temperature (T_J) of +150 °C, as specified in its operating temperature range. This limit must be respected under all conditions-including transient pulses-to prevent permanent degradation. Derating curves in Figure 1 confirm that power dissipation must be reduced linearly above +25 °C ambient when using the minimum pad layout.

Is DJT4031N pin-compatible with DJT4030P?

No-DJT4031N (NPN) and DJT4030P (PNP) share the same SOT-223 package and pinout configuration (Emitter/Base/Collector/Collector), but their polarity and biasing requirements differ fundamentally. They are complementary devices intended for paired use (e.g., push-pull stages), not drop-in replacements.

Can DJT4031N be used in linear amplifier applications?

Yes-its specified h_FE (100–500), V_BE(ON) (1.0 V), and f_T (105 MHz) support Class-A and Class-AB linear amplification at frequencies up to several MHz. However, thermal management is critical: linear operation demands careful derating of PD due to continuous power dissipation, especially with the 62.5 °C/W R_θJA condition.

What does "Green" Device mean for DJT4031N?

"Green" refers to Diodes Incorporated's internal environmental standard: halogen-free molding compound (≤900 ppm bromine, ≤900 ppm chlorine), lead-free plating, and absence of antimony trioxide flame retardant. It exceeds RoHS requirements and aligns with IPC-4101D/21 specifications for environmentally responsible PCB assembly.