Diodes Incorporated DNLS412E-13

Overview

DNLS412E-13 from Diodes Incorporated is a low V_CE(SAT) NPN surface-mount transistor in SOT-223 package, rated for 4 A continuous collector current, 12 V V_CEO, and 57.5 mΩ R_CE(SAT) at 4 A. It serves as a medium-power switching device in DC-DC converters and motor drive stages where low conduction loss and high h_FE (>400 at I_C = 3 A) are critical.

For engineers reviewing the DNLS412E-13 datasheet, DNLS412E-13 pinout, DNLS412E-13 application, or DNLS412E-13 equivalent, key selection criteria include verified V_CE(SAT) performance at ≥3 A, thermal resistance (R_θJA = 125 °C/W on FR-4), complementary PNP pairing (DPLS315E), and RoHS-compliant lead-free plating.

Technical Context

This NPN bipolar junction transistor uses epitaxial planar die construction to achieve stable gain and low saturation voltage. Its V_CEO = 12 V and V_CB0 = 12 V rating support operation in 12 V rail systems with margin for transient spikes.

With f_T = 150 MHz and switching times of t_on = 40 ns / t_off = 500 ns under defined test conditions, it supports medium-speed switching in PWM-controlled loads without excessive switching loss.

Key Specifications

Pinout & Package

Package: SOT-223, surface-mount, 4-pin (pin 4 internally connected to tab/collector). Molded plastic case with UL 94V-0 rating and matte tin-plated copper leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with FZT688B and DPLS315E, DNLS412E delivers superior conduction efficiency at 4 A and enables higher current density in space-constrained SOT-223 layouts-making it optimal for thermally demanding, high-duty-cycle switching.

Availability

DNLS412E-13 is available at Aetrix Electronics and suitable for DC-DC converters, brushed DC motor drivers, LED constant-current regulators, and power supply OR-ing circuits requiring stable component supply and long-term manufacturability.

Supply support for DNLS412E-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 and manufacturing operations across Asia and the Americas.

DNLS412E belongs to Diodes' low-V_CE(SAT) bipolar transistor product line, engineered specifically for high-efficiency, medium-power switching in industrial and automotive-qualified power systems.

FAQ

Is DNLS412E-13 pin-compatible with standard SOT-223 transistors?

Yes - DNLS412E-13 uses the industry-standard SOT-223 outline with pin 1 = emitter, pin 2 = collector, pin 3 = base, and pin 4 = collector tab. Mechanical dimensions match JEDEC TO-261AA, and the tab is electrically tied to pin 2, enabling direct replacement in existing SOT-223 footprints designed for NPN devices.

What is the maximum allowable junction temperature for continuous operation?

The absolute maximum junction temperature is +150 °C, and the device is rated for continuous operation across –55 °C to +150 °C ambient. At 4 A and 125 °C/W R_θJA, sustained power dissipation must remain below 1 W to avoid exceeding T_J = 150 °C - achievable with ≥1 in² 2-oz copper pour per AP02001 layout.

Does DNLS412E-13 support pulse current beyond its DC rating?

Yes - the peak pulse current rating is I_CM = 10 A, specified under pulse test conditions (pulse width ≤300 μs, duty cycle ≤2%). This supports short-duration surge handling in motor startup or inrush limiting, provided average power remains within the 1 W thermal limit.

Why is DNLS412E marked "Not Recommended for New Design"?

Diodes Incorporated issued this notice due to planned obsolescence or migration toward newer process technologies (e.g., Trench-MOS or advanced BJT variants). The part remains fully functional and supported for existing designs, with no immediate discontinuance - but new projects should evaluate alternatives like FZT688B or next-generation equivalents for long-term supply assurance.