Diodes Incorporated MJD31C-13

Overview

MJD31C-13 from Diodes Incorporated is a 100V NPN high-voltage power transistor in TO252 (DPAK) package, rated for 3A continuous collector current and 5A peak pulse current, with V_CEO = 100V, V_CE(sat) ≤ 1.2V at I_C = 3A/I_B = 375mA, and h_FE ≥ 25 at I_C = 1A - used in DC-DC converter switching stages and industrial motor drive output stages.

For engineers reviewing the MJD31C-13 datasheet, MJD31C-13 pinout, MJD31C-13 application, or MJD31C-13 equivalent, key selection criteria include verified 100V breakdown rating, thermal resistance R_θJA = 32°C/W on 50mm × 50mm 2oz copper, AEC-Q101 qualification, complementary PNP pairing with MJD32C, and TO252 lead-free RoHS/Green compliance.

Technical Context

This NPN bipolar junction transistor operates as a high-voltage, medium-current switch with guaranteed V_CEO > 100V and V_CE(sat) ≤ 1.2V under 3A/375mA drive. Its h_FE ranges from 25–50 across 1–3A collector currents, supporting stable gain-controlled linear amplification or saturated switching.

Thermal design relies on the exposed collector pad: R_θJL = 3.6°C/W to leads enables efficient heat transfer when soldered to PCB copper, while R_θJA varies from 32°C/W (full thermal pad) to 80°C/W (minimum recommended layout), directly impacting safe operating area limits.

Key Specifications

Pinout & Package

Package: TO252 (DPAK), surface-mount, with exposed collector pad for thermal and electrical connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STN3PF10 and MJD31CT4G, MJD31C-13 offers proven bipolar gain linearity for analog current control and AEC-Q101 validation with documented thermal performance on standard DPAK layouts - making it preferable for cost-sensitive, thermally constrained industrial switching where base drive is already available.

Availability

MJD31C-13 is available at Aetrix Electronics and suitable for industrial motor drives, automotive lighting control, and DC-DC converter switching requiring stable component supply and long-term lifecycle support.

Supply support for MJD31C-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 power management and signal integrity solutions for automotive, industrial, and consumer markets.

The MJD31C belongs to Diodes' high-voltage bipolar transistor product line, engineered for ruggedized switching and amplification in space-constrained, thermally demanding applications where AEC-Q101 qualification and TO252 thermal efficiency are critical.

FAQ

What is the maximum allowable case temperature for continuous operation?

The MJD31C-13 has an operating junction temperature range of –55°C to +150°C. With R_θJA = 32°C/W on a 50mm × 50mm 2oz copper pad, the maximum case temperature at 3A/1.2V conduction loss (3.6W) is 150°C − (3.6W × 32°C/W) = 138°C. Derating is required above 125°C ambient to maintain safe junction temperature.

Can MJD31C-13 be used in linear amplifier mode?

Yes - its h_FE of 25–50 across 1–3A and f_T = 3.0MHz support stable Class-A or AB audio and precision current amplification. However, power dissipation must remain within PD = 3.9W (derated above 25°C ambient), requiring heatsinking for >1W output.

Is the exposed collector pad electrically isolated from other terminals?

No - the exposed pad is internally connected to the collector terminal. It must be routed to the collector net on the PCB and not shorted to ground or other potentials. This connection is essential for both thermal performance and correct circuit operation.

How does the MJD31C-13 compare to the MJD31C in terms of packaging and performance?

MJD31C-13 is the tape-and-reel variant (2500 units per 16-inch reel, 24mm tape width) of the same die and TO252 package as the MJD31C. Electrical, thermal, and reliability specifications are identical; only packaging format differs for SMT automation compatibility.