onsemi MJD32CTM

Overview

MJD32CTM from ON Semiconductor is a PNP epitaxial silicon power transistor in D-PAK package, rated for −100 V V_CEO, −3 A continuous collector current, and 15 W collector dissipation at T_C = 25°C. It serves as a general-purpose amplifier and low-speed switching device in DC-DC converters, motor drivers, and relay interface circuits.

For engineers reviewing the MJD32CTM datasheet, pinout, applications, or equivalent options, key selection criteria include its −100 V blocking capability, −3 A DC current rating, D-PAK thermal performance, and compatibility with legacy TIP32C-based designs requiring surface-mount upgrade paths.

Technical Context

The MJD32CTM operates as a medium-power PNP bipolar junction transistor optimized for linear amplification and saturated switching. Its design features a V_CEO(sus) of −100 V under I_C = −30 mA, h_FE ≥ 10 at I_C = −3 A, and V_CE(sat) ≤ −1.2 V at I_C = −3 A / I_B = −375 mA - confirming robust conduction in high-current switching.

Thermal behavior is defined by a 15 W T_C-referenced power limit and 1.56 W at ambient (T_A = 25°C), indicating strong dependence on heatsinking. Junction temperature is rated to 150°C, with storage range from −65°C to +150°C, supporting industrial-grade deployment.

Key Specifications

Pinout & Package

D-PAK (TO-252) surface-mount package with exposed drain pad for thermal enhancement; standardized 3-pin configuration with gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MJD32C and BDW53C, the MJD32CTM uniquely balances surface-mount manufacturability, −100 V ruggedness, and thermal efficiency in a compact D-PAK - making it optimal for space-constrained industrial controls where automated assembly and thermal performance are prioritized over raw current headroom.

Availability

MJD32CTM is available at Aetrix Electronics and suitable for DC-DC converters, industrial relay drivers, and motor control circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant surface-mount packaging.

Supply support for MJD32CTM 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The MJD32CTM belongs to ON Semiconductor's general-purpose bipolar transistor product line, engineered for cost-effective, thermally robust switching and amplification in industrial and power management applications.

FAQ

What is the maximum continuous collector current rating for the MJD32CTM?

The MJD32CTM has a maximum continuous collector current (I_C) rating of −3 A at T_C = 25°C. This rating assumes proper heatsinking; derating applies above 25°C case temperature per the published power derating curve. At ambient conditions without heatsink, the usable current drops to approximately 1.2 A due to its 1.56 W T_A power limit. Always verify thermal design using the MJD32CTM's thermal resistance data.

Is the MJD32CTM pin-compatible with the through-hole TIP32C?

No, the MJD32CTM is not pin-compatible with the TIP32C. While electrically similar, the MJD32CTM uses a D-PAK (TO-252) package with Base–Collector–Emitter pinout (1–2–3), whereas the TIP32C uses TO-220 with Collector–Base–Emitter (1–2–3). The MJD32CTM is designed as a surface-mount alternative-not a drop-in replacement-requiring PCB layout revision for migration from TIP32C.

What is the typical V_CE(sat) of the MJD32CTM under full-load conditions?

The MJD32CTM exhibits a typical V_CE(sat) of −1.2 V at I_C = −3 A and I_B = −375 mA, per its datasheet test condition. This value reflects deep saturation and is critical for calculating conduction losses in switching applications. Actual V_CE(sat) may vary ±0.15 V across process and temperature; design margins should account for worst-case −1.35 V at T_J = 125°C.

Does the MJD32CTM require a heatsink in standard operation?

Yes, the MJD32CTM requires thermal management for sustained operation above ~500 mA. Its 15 W power rating is only achievable at T_C = 25°C - meaning the case must be held at that temperature via heatsink or large copper area. Without heatsinking, its 1.56 W ambient-rated dissipation limits practical use to low-duty-cycle or intermittent loads. The exposed thermal pad in the D-PAK package must be soldered to ≥1 cm² of inner-layer copper for effective heat transfer.

Can the MJD32CTM be used in linear regulator applications?

Yes, the MJD32CTM is suitable as a series pass transistor in linear voltage regulators, especially where −100 V input-to-output differential and up to 3 A load current are needed. Its 150°C maximum junction temperature and stable h_FE down to I_C = −3 A support regulated outputs with >5 V dropout. However, thermal design must ensure T_J remains below 150°C under worst-case power dissipation - typically requiring active or substantial passive cooling.