onsemi MJL4302A

Overview

MJL4302A from onsemi is a complementary PNP silicon power bipolar transistor designed for high-power audio amplifier output stages, featuring 350 V V_CEO, 15 A continuous collector current, 230 W power dissipation at T_C = 25°C, and high safe operating area (1.0 A/100 V @ 1 second). It delivers low harmonic distortion and linear gain from 100 mA to 5 A in push-pull configurations with the MJL4281A.

For engineers reviewing the MJL4302A datasheet, pinout, applications, or equivalent options, this page provides verified electrical specifications, TO-264 package terminal mapping, thermal resistance (R_θJC = 0.54°C/W), safe operating area curves, and confirmed alternatives for high-fidelity audio power stage design.

Technical Context

The MJL4302A operates as a high-voltage, high-current PNP switching and linear amplifier device with DC current gain (h_FE) ranging from 80 (min at I_C = 100 mA) to 50 (min at I_C = 8 A), and f_T = 35 MHz at I_C = 1 A. Its V_CE(sat) ≤ 1.0 V and V_BE(sat) ≤ 1.4 V at I_C = 8 A / I_B = 0.8 A support efficient Class AB operation.

Thermal performance is defined by R_θJC = 0.54°C/W and junction temperature range of −65°C to +150°C. The device exhibits second breakdown limits of 4.5 A @ V_CE = 50 V (1 s) and 1.0 A @ V_CE = 100 V (1 s), enabling robust transient handling in audio output stages.

Key Specifications

Pinout & Package

Package: TO-264 (Case 340G, Style 2), isolated metal tab, Pb-free option available (MJL4302AG).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BDW93C and MJE15034, the MJL4302A provides superior voltage headroom, higher continuous current, lower thermal resistance, and guaranteed Pb-free availability - making it the preferred choice for new high-power audio amplifier designs targeting ≥±150 V rails and >200 W output.

Availability

MJL4302A is available at Aetrix Electronics and suitable for professional audio amplifiers, studio monitor output stages, and public address systems requiring stable component supply, long-lifecycle support, and traceable sourcing for production programs.

Supply support for MJL4302A 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in high-performance power, analog, sensor, and logic solutions for automotive, industrial, and communications markets.

The MJL4302A belongs to onsemi's high-voltage power bipolar transistor family, engineered specifically for high-fidelity, high-reliability audio power amplification with emphasis on SOA integrity, gain linearity, and thermal robustness.

FAQ

What is the maximum continuous collector current rating for the MJL4302A?

The MJL4302A has a maximum continuous collector current (I_C) rating of 15 A at T_C = 25°C. This rating assumes proper heatsinking and derating per the datasheet's thermal resistance (R_θJC = 0.54°C/W). At higher case temperatures, current must be reduced linearly - for example, to ~10 A at T_C = 75°C. The MJL4302A maintains specified h_FE and V_CE(sat) within this range when operated within its SOA limits.

Is the MJL4302A pin-compatible with the MJL4281A?

No - the MJL4302A (PNP) and MJL4281A (NPN) share identical TO-264 package dimensions and pinout (Base, Collector, Emitter on pins 1, 2, 3 respectively), but they are complementary devices, not pin-compatible replacements. Their electrical polarities differ: MJL4302A requires negative base drive relative to emitter, while MJL4281A requires positive base drive. Both are intended for paired use in push-pull output stages, not interchange.

Does the MJL4302A have a Pb-free version, and how is it marked?

Yes, the Pb-free version is designated MJL4302AG and is marked with a "G" suffix in the date code (e.g., "AYYWWG"). Per onsemi documentation, the "G" indicates compliance with RoHS Directive 2011/65/EU. The MJL4302AG uses the same TO-264 package and shares identical electrical and thermal specifications with the standard MJL4302A - only the lead finish differs.

What is the safe operating area (SOA) limit for the MJL4302A at 100 V V_CE?

At V_CE = 100 V, the MJL4302A's non-repetitive SOA limit is 1.0 A for 1 second (t = 1 s), as specified in the datasheet's Second Breakdown table. This reflects the device's ability to withstand transient overloads without secondary breakdown. For repetitive operation, designers must consult the SOA graph (Figure 12) and apply appropriate derating based on pulse width, duty cycle, and heatsink thermal mass.

Can the MJL4302A be used in switching power supplies?

The MJL4302A is optimized for linear audio amplifier applications, not switching power supplies. While it supports f_T = 35 MHz, its relatively high V_CE(sat) (≤1.0 V), slow turn-off characteristics, and lack of specified switching timing parameters (t_on, t_off, storage time) make it unsuitable for high-frequency SMPS. For such applications, MOSFETs or dedicated switching transistors like the MJD127 are recommended instead of the MJL4302A.