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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

STMicroelectronics MJ4032

Name: MJ4032
Brand: STMicroelectronics
SKU: MJ4032
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJ4032

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-204AA, TO-3

Datasheet:: MJ4032.pdf

Description:: TRANS PNP DARL 100V 16A TO-3

Quantity:: RFQ Add To RFQ list

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Inventory:2,696

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Product details

Overview

MJ4032 from STMicroelectronics is a complementary PNP silicon power Darlington transistor in monolithic configuration, housed in a TO-3 metal package. It delivers 100 V V_CEO, 16 A I_C, 150 W P_tot, integrated antiparallel C–E diode, and h_FE ≥ 1000 at 10 A - used in high-current linear amplifiers and industrial DC motor control stages.

For engineers reviewing the MJ4032 datasheet, MJ4032 pinout, MJ4032 application, or MJ4032 equivalent, key selection criteria include guaranteed DC current gain at high collector current, junction-to-case thermal resistance (1.17 °C/W), safe operating area under pulsed switching, and compatibility with MJ4035 in push-pull output stages.

Technical Context

The MJ4032 implements a monolithic Darlington pair with built-in base-emitter resistor network (R1 ≈ 6 kΩ, R2 ≈ 55 Ω) enabling single-base drive and improved turn-off behavior. Its integrated antiparallel collector-emitter diode supports bidirectional current handling in relay drivers and H-bridge freewheeling paths.

Rated for T_j up to 200 °C and T_stg from –65 to +200 °C, it operates with negative polarity voltage/current ratings (e.g., V_CBO = –100 V, I_C = –16 A), and exhibits V_CE(sat) ≤ 4 V at I_C = –16 A / I_B = –80 mA under pulsed conditions (300 µs, 1.5% duty).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	–100 V - maximum reverse-biased collector-emitter voltage before breakdown in active switching
I_C	–16 A - continuous collector current rating defining usable load drive capacity
P_tot	150 W at T_c ≤ 25 °C - total power dissipation limit requiring heatsink design per R_thj-case = 1.17 °C/W
h_FE	≥1000 at I_C = –10 A, V_CE = –3 V - high DC gain enabling low base drive current in linear amplifier stages
V_CE(sat)	≤4 V at I_C = –16 A, I_B = –80 mA - saturation voltage determining conduction loss and thermal load in switching applications
R_thj-case	1.17 °C/W max - junction-to-case thermal resistance dictating minimum heatsink thermal resistance for safe operation

Pinout & Package

Package: TO-3 metal case (JEDEC standard), with electrically isolated collector tab, suitable for direct mounting to heatsinks with insulating washers.

Pin/Terminal	Circuit Role	Design Meaning
Collector (Tab)	Main current output terminal, electrically connected to metal case	Requires electrical isolation from heatsink; primary path for high-current load return
Base	Control input for Darlington pair	Drives internal cascaded PNP transistors; accepts low-current logic-level signals via external series resistor
Emitter	Main current input terminal	Connects to positive rail in high-side switch configurations; carries full load current with minimal voltage drop

Key Features

Feature	Design Value
Monolithic Darlington structure	Single-die integration eliminates interconnect parasitics and ensures matched gain/thermal tracking between driver and output transistors
Integrated antiparallel C–E diode	Enables inherent freewheeling path without external diode, reducing component count in inductive load drivers
Built-in base bias resistors (R1 ≈ 6 kΩ, R2 ≈ 55 Ω)	Eliminates need for external base resistors in simple on/off control, simplifying PCB layout and improving reliability
TO-3 metal package with isolated collector	Provides robust mechanical integrity, high thermal conductivity (1.17 °C/W), and EMI shielding in noisy industrial environments

Applications

High-Current Linear Amplifier

DC Motor Direction Control

Use Scenario: Audio-frequency power stage driving 4 Ω loudspeaker loads with low distortion at >10 W output.

IC Role / Device Role / Timing Role: PNP output device in complementary Class-AB amplifier topology, paired with MJ4035.

Use Value: High h_FE (≥1000) reduces required driver stage gain and improves thermal stability across output swing.

Use Scenario: One quadrant of an industrial H-bridge controlling 24 V / 12 A brushed DC motor.

IC Role / Device Role / Timing Role: High-side PNP switch providing current sourcing path during forward rotation phase.

Use Value: Integrated C–E diode clamps inductive kickback during PWM off-time, eliminating discrete flyback diode.

Relay Driver Circuit

High-Voltage Power Supply Regulator

Use Scenario: Driving 125 V AC coil relays with 500 mA hold current in PLC output modules.

IC Role / Device Role / Timing Role: Saturated switch interfacing microcontroller GPIO to high-voltage inductive load.

Use Value: Guaranteed V_CEO = –100 V and low V_CE(sat) ensure reliable turn-on margin and minimal self-heating at full coil current.

Use Scenario: Pass element in linear regulated 80 V / 3 A bench power supply.

IC Role / Device Role / Timing Role: Series pass transistor dissipating up to 120 W in constant-current mode.

Use Value: 200 °C max junction temperature and 150 W P_tot support extended safe operation under sustained thermal stress.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TIP142	V_CEO = –100 V, I_C = –10 A, h_FE ≥ 1000, TO-218 package, no integrated diode	Lacks antiparallel C–E diode; requires external flyback diode in inductive switching	Select when lower cost and standard plastic package suffice, and external diode layout is acceptable
BDW53C	V_CEO = –100 V, I_C = –12 A, h_FE ≥ 750, TO-3 package, no integrated diode or base resistors	Lower gain and no internal biasing; requires external base drive network	Choose where higher base drive flexibility is needed and system-level optimization justifies added components

Compared with TIP142 and BDW53C, MJ4032 provides superior integration (built-in diode + base resistors), higher current rating (16 A vs. 10–12 A), and metal-package thermal performance - making it optimal for space-constrained, thermally demanding industrial amplifiers and motor drives.

Availability

MJ4032 is available at Aetrix Electronics and suitable for high-current linear amplifiers, DC motor direction control, relay driver circuits, and high-voltage linear power supply regulators requiring stable component supply and long-lifecycle support.

Supply support for MJ4032 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, delivering analog, power, MCU, and sensor solutions for automotive, industrial, and consumer markets.

MJ4032 belongs to ST's legacy power bipolar transistor family, engineered specifically for ruggedized industrial switching and linear amplification where high current, high voltage, and thermal resilience are critical.

FAQ

Is MJ4032 pin-compatible with MJ4035?

No - MJ4032 (PNP) and MJ4035 (NPN) are complementary devices with identical TO-3 pinout (Collector–Base–Emitter), but opposite polarity. Their terminals serve mirrored roles: MJ4032 emitter sources current, while MJ4035 emitter sinks it. They are designed for pairing in push-pull or H-bridge topologies, not direct substitution.

What is the function of the integrated antiparallel collector-emitter diode?

The integrated diode conducts reverse current from emitter to collector during inductive load flyback events. It eliminates the need for an external freewheeling diode in relay, solenoid, or motor drive circuits, reducing bill-of-materials count and PCB area while ensuring consistent clamping behavior tied to the transistor's thermal profile.

Can MJ4032 be used without external base resistors?

Yes - its internal R1 (≈6 kΩ) and R2 (≈55 Ω) form a Darlington bias network enabling direct connection to TTL or CMOS logic outputs. However, for precise current limiting or high-speed switching, an external series base resistor may still be added to control turn-on/turn-off timing and prevent overdrive under transient conditions.

What thermal interface material is recommended for MJ4032 in TO-3 package?

A silicone-based thermal compound (e.g., Dow Corning TC-5123) with 0.8–1.2 W/m·K conductivity and dielectric strength >5 kV/mm is recommended. When using mica or ceramic insulators, apply 0.05–0.1 mm bond line thickness and torque mounting screws to 12–15 in·lb to maintain uniform pressure and minimize interfacial thermal resistance.

MJ4032 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-204AA, TO-3

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: PNP - Darlington

Current - Collector (Ic) (Max):: 16 A

Voltage - Collector Emitter Breakdown (Max):: 100 V

Vce Saturation (Max) @ Ib, Ic:: 2.5V @ 40mA, 10A

Current - Collector Cutoff (Max):: 3mA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 1000 @ 10A, 3V

Power - Max:: 150 W

Frequency - Transition:: -

Operating Temperature:: 200°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Chassis Mount

Supplier Device Package:: TO-3

MJ4032 FAQ

1.How can I place an order for MJ4032 through Aetrix?

Please submit a Request for Quotation (RFQ) for MJ4032 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MJ4032 reliable?

The price and inventory of MJ4032 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJ4032 is usually 5 days.

3.What payment methods are accepted for MJ4032?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJ4032 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJ4032?

MJ4032 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJ4032 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MJ4032?

For technical support, including MJ4032 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJ4032 requirements.

6.How does Aetrix verify that MJ4032 is sourced from the original manufacturer or authorized distributors?

All MJ4032 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MJ4032 meets industry standards.

7.What is the process for return or replacement of MJ4032?

All MJ4032 units undergo pre-shipment inspection (PSI). If there is an issue with MJ4032, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MJ4032 part is unused and in its original packaging.

Return procedure for MJ4032:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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