Diodes Incorporated MJD340-13

Overview

MJD340-13 from Diodes Incorporated is a 100V NPN high-voltage bipolar junction transistor in TO252 (DPAK) package, rated for 300V V_CEO, 0.5A continuous collector current, and 15W power dissipation at T_C = 25°C; used in offline AC/DC power supply switching stages and industrial motor control interface circuits.

For engineers reviewing the MJD340-13 datasheet, MJD340-13 pinout, MJD340-13 application, or MJD340-13 equivalent, key selection criteria include V_CEO ≥ 300V, I_C ≥ 0.5A, R_θJC ≤ 8.33°C/W, AEC-Q101 qualification, and TO252 thermal pad compatibility with FR-4 PCB layouts.

Technical Context

This NPN transistor operates as a medium-power switching device with DC current gain (h_FE) ranging from 30 to 240 at V_CE = 10V and I_C = 50mA, and features f_T = 10MHz for moderate-speed switching applications up to ~100kHz.

Its 300V V_CEO and 7V V_EBO ratings support operation in high-side switch configurations with flyback energy management, while V_CE(SAT) ≤ 0.5V at I_C = 100mA/I_B = 10mA ensures low conduction loss in pulsed-load drivers.

Key Specifications

Pinout & Package

Package: TO252 (DPAK), surface-mount, thermally enhanced plastic case with exposed drain pad (pin 2) for heat transfer. Molded compound meets UL 94V-0 flammability rating and J-STD-020 Level 1 moisture sensitivity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN transistor applications.

Compared with ZTX653 and MJD127, the MJD340-13 uniquely combines 300V blocking capability, AEC-Q101 reliability, and TO252 thermal performance-making it the only option among the three for 230VAC offline switching in automotive or industrial environments.

Availability

MJD340-13 is available at Aetrix Electronics and suitable for industrial motor control, AC/DC power supply design, and automotive lighting applications requiring stable component supply across extended product lifecycles.

Supply support for MJD340-13 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, specializing in high-reliability components for automotive, industrial, and computing markets.

The MJD340 belongs to Diodes' high-voltage bipolar transistor product line, engineered for robust switching in harsh-environment power conversion and control systems where voltage endurance and thermal stability are critical.

FAQ

What is the maximum safe operating voltage for MJD340-13 in continuous DC applications?

The MJD340-13 has a guaranteed minimum V_CEO of 300V under pulsed test conditions (I_C = 1mA). For continuous DC operation, design margin requires limiting V_CE to ≤ 240V per industry practice for long-term reliability at elevated temperatures.

Can MJD340-13 be used as a direct replacement for MJD112 in an existing TO252-based design?

No - MJD112 is a PNP transistor with V_CEO = 100V and complementary polarity. MJD340-13 is NPN with 300V rating; substituting it would invert logic and exceed voltage limits in the original circuit's emitter-follower configuration.

Does the TO252 package of MJD340-13 require solder paste stencil aperture adjustments for thermal pad reflow?

Yes - the exposed collector pad (pin 2) requires a 70–80% solder paste coverage area with 4–6 thermal vias (0.3mm diameter, spaced ≤ 1.2mm apart) to achieve R_θJA ≤ 80°C/W on standard FR-4, per Diodes' recommended pad layout.

Is MJD340-13 suitable for linear regulator pass transistor applications?

No - its 15W power dissipation rating applies only at T_C = 25°C with ideal heatsinking. In linear regulation, sustained V_CE × I_C > 2W causes rapid thermal runaway due to positive temperature coefficient of V_BE; it is specified exclusively for switching use.