Diodes Incorporated MJD350-13

Overview

MJD350-13 from Diodes Incorporated is a 300V PNP high-voltage bipolar junction transistor (BJT) in TO252 (DPAK) package, rated for -0.5A continuous collector current and -300V collector-emitter breakdown voltage. It serves as a high-voltage switching or linear amplification device in off-line power supplies, relay drivers, and industrial control circuits where robust negative-rail switching is required.

For engineers reviewing the MJD350-13 datasheet, MJD350-13 pinout, MJD350-13 application, or MJD350-13 equivalent, key selection criteria include verified V_CEO = -300V, I_C = -0.5A, R_θJC = 8.33°C/W, h_FE range of 30–240, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This PNP transistor operates with emitter-grounded configuration in high-side switch topologies or common-emitter amplifier stages. Its -300V V_CEO rating enables direct use in 230V AC rectified bus applications without snubbers, while its 15W power dissipation at T_C = +25°C supports thermally constrained PCB layouts with minimal heatsinking.

The device delivers V_CE(SAT) ≤ -0.5V at I_C = -100mA/I_B = -10mA and f_T = 10MHz, confirming suitability for low-frequency switching (<100kHz) and audio-frequency amplification where gain stability and voltage tolerance outweigh speed requirements.

Key Specifications

Pinout & Package

Package: TO252 (DPAK), surface-mount, single-ended heat sink tab (collector-connected), 3-terminal configuration with exposed copper pad for thermal conduction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-voltage switching applications.

Compared with ZTX603 and MJD353, the MJD350-13 uniquely balances -300V rating, AEC-Q101 compliance, and TO252 thermal performance for automotive and industrial high-voltage switching where both voltage margin and reliability are mandatory.

Availability

MJD350-13 is available at Aetrix Electronics and suitable for industrial motor control, AC/DC power supply design, and automotive lighting systems requiring stable component supply with long-term lifecycle assurance.

Supply support for MJD350-13 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 consumer markets.

The MJD350 belongs to Diodes' high-voltage bipolar transistor product line, engineered for robustness in off-line switching, relay driving, and linear regulation where voltage endurance and AEC-Q101 validation are critical.

FAQ

What is the maximum safe operating junction temperature for MJD350-13?

The MJD350-13 has an operating junction temperature range of -55°C to +150°C. For reliable long-term operation, junction temperature should be limited to ≤125°C under continuous load, achievable with proper PCB copper area and ambient temperature control per the R_θJA = 81°C/W derating curve.

Can MJD350-13 be used as a direct replacement for MJD340 in complementary pair designs?

No - MJD350-13 is the PNP complement to the NPN MJD340, not a drop-in replacement. They share identical voltage/current ratings and TO252 packaging but opposite polarity; pairing them requires reversed biasing and complementary drive circuitry, not substitution.

Is the collector tab electrically isolated in the TO252 package?

No - the metal tab is internally connected to the collector terminal. When mounting, ensure electrical isolation from ground or other potentials using insulating thermal pads or shoulder washers, and verify creepage/clearance distances per IEC 60950 or IEC 62368 for high-voltage applications.

Does MJD350-13 require a base resistor, and how is its value calculated?

Yes - a base resistor is mandatory to limit base current. For saturation at I_C = -0.5A with h_FE(min) = 30, minimum I_B = -16.7mA is needed. With V_BE(ON) ≈ -1.0V and 3.3V logic drive, R_B = (3.3V − 1.0V)/16.7mA ≈ 138Ω; a standard 150Ω resistor ensures reliable turn-on.