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

STMicroelectronics MJ3001

Name: MJ3001
Brand: STMicroelectronics
SKU: MJ3001
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJ3001

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-204AA, TO-3

Datasheet:: MJ3001.pdf

Description:: TRANS NPN DARL 80V 10A TO-3

Quantity:: RFQ Add To RFQ list

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Inventory:8,306

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Product details

Overview

MJ3001 from STMicroelectronics is an NPN silicon epitaxial-base power Darlington transistor in a monolithic configuration, housed in a TO-3 metal package. It delivers 10 A collector current, 80 V V_CEO, and 150 W total dissipation at T_c ≤ 25 °C, with h_FE ≥ 1000 at I_C = 5 A - designed for audio power amplifiers, DC-AC converters, and low-voltage DC motor drivers.

For engineers reviewing the MJ3001 datasheet, MJ3001 pinout, MJ3001 application, or MJ3001 equivalent, key selection criteria include guaranteed h_FE ≥ 1000 at high current, V_CEO(sus) = 80 V under pulsed conditions, thermal resistance R_thj-case = 1.17 °C/W, and complementary pairing with MJ2501 for push-pull output stages.

Technical Context

The MJ3001 operates as a monolithic Darlington pair with integrated base-emitter resistors (R1 ≈ 10 kΩ, R2 ≈ 150 Ω), enabling direct TTL/CMOS drive without external biasing. Its 200 °C maximum junction temperature and robust SOA support sustained linear operation in Class AB audio outputs.

As the NPN complement to the PNP MJ2501, it forms matched pairs for symmetrical power switching and amplifier output stages. The TO-3 metal case provides low thermal resistance and mechanical ruggedness for industrial power applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Sustains full rated collector-emitter voltage with IB = 0, enabling use in 48 V DC-AC inverters and high-swing audio rails.
I_C	10 A continuous - Supports high-current load driving, e.g., 24 V/5 A DC motors or 50 W audio output stages.
P_tot	150 W at T_c ≤ 25 °C - Requires heatsinking for >50 W operation; enables compact thermal design when mounted on aluminum chassis.
h_FE	≥1000 at I_C = 5 A, V_CE = 3 V - Reduces required base drive current to ≤5 mA, simplifying driver stage design.
R_thj-case	1.17 °C/W - Enables predictable junction temperature rise (ΔT_j = 176 °C at 150 W), critical for reliability in sealed enclosures.
V_CE(sat)	2 V at I_C = 5 A, I_B = 20 mA - Limits conduction loss to 10 W at 5 A, improving efficiency over single-stage power transistors.

Pinout & Package

Package: TO-3 metal case (JEDEC standard), with collector connected to case for direct heatsink mounting and electrical grounding.

Pin/Terminal	Circuit Role	Design Meaning
Collector (Case)	Main current sink terminal	Electrically tied to metal case; must be insulated from heatsink unless circuit ground reference permits direct mounting.
Base	Control input	Internally biased via R1 (10 kΩ) and R2 (150 Ω); accepts logic-level drive without external resistor network.
Emitter	Main current source terminal	Provides low-impedance return path; used as output node in emitter-follower configurations or high-side switch emitters.

Key Features

Feature	Design Value
Monolithic Darlington structure	Integrates driver and output transistors on one die, eliminating interconnect parasitics and ensuring matched thermal tracking.
Internal base bias resistors	R1 = 10 kΩ and R2 = 150 Ω enable direct TTL/CMOS compatibility and eliminate need for external base resistor networks.
High h_FE at full current	h_FE ≥ 1000 at I_C = 5 A ensures stable gain under load, reducing distortion in linear audio amplifier output stages.
TO-3 metal package	Provides 1.17 °C/W thermal resistance and mechanical durability for industrial environments with vibration or thermal cycling.

Applications

Audio Power Amplifier

DC-AC Converter

Use Scenario: High-fidelity Class AB push-pull output stage delivering 30–50 W into 4–8 Ω loads.

IC Role / Device Role / Timing Role: NPN output switch in complementary pair with MJ2501, handling positive half-cycle current delivery.

Use Value: High h_FE minimizes driver stage complexity; low V_CE(sat) reduces heat generation and improves thermal margin at full output.

Use Scenario: 48 V DC input to 120 V AC square-wave inverter for emergency lighting or UPS systems.

IC Role / Device Role / Timing Role: High-current switching element in half-bridge topology, switching at 50–60 Hz with snubber-assisted turn-off.

Use Value: 80 V V_CEO rating supports 48 V bus with 2× safety margin; TO-3 package withstands repetitive surge currents up to 10 A.

Low-Voltage DC Motor Driver

General Power Switching

Use Scenario: Bidirectional H-bridge driver for 12–24 V brushed DC motors in industrial actuators or robotics.

IC Role / Device Role / Timing Role: High-side NPN switch controlling motor supply rail; paired with PNP MJ2501 for complementary control.

Use Value: Internal base resistors allow direct microcontroller GPIO drive; 10 A rating supports peak stall currents without derating.

Use Scenario: Solid-state relay replacement in PLC output modules switching 24 V/5 A solenoid loads.

IC Role / Device Role / Timing Role: Main power switch in opto-isolated driver stage, operating in saturation for minimal conduction loss.

Use Value: 150 W dissipation capacity enables continuous duty cycle at full load; 200 °C T_jmax supports operation in unventilated control cabinets.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TIP142	V_CEO = 100 V, I_C = 10 A, h_FE = 1000–5000, TO-218 package, no internal base resistors	Higher voltage rating but requires external base drive network; lower thermal resistance (1.0 °C/W) but plastic package limits chassis grounding	Select when higher V_CEO margin is needed and external biasing is acceptable.
BDW83C	V_CEO = 60 V, I_C = 12 A, h_FE = 750 min, TO-3 package, no internal resistors	Lower voltage rating limits use to ≤36 V systems; higher current but reduced gain stability at high I_C	Select for cost-sensitive 24 V motor control where V_CEO margin is sufficient and base drive can be optimized externally.

Compared with MJ3001, TIP142 offers higher voltage headroom but adds design complexity due to missing internal bias resistors, while BDW83C trades voltage capability for higher current and lower cost - making MJ3001 optimal for 48 V-class linear and switching applications requiring plug-and-play drive simplicity.

Availability

MJ3001 is available at Aetrix Electronics and suitable for audio power amplifiers, DC-AC converters, and low-voltage DC motor drivers requiring stable component supply and long-term industrial availability.

Supply support for MJ3001 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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The MJ3001 belongs to ST's legacy power bipolar transistor family, engineered specifically for high-reliability linear and switching power applications where ruggedness, thermal stability, and complementary pairing are essential.

FAQ

Is MJ3001 pin-compatible with MJ2501?

No - MJ3001 (NPN) and MJ2501 (PNP) share identical TO-3 pinout and mechanical footprint, but their terminal polarities differ: MJ3001 emitter is output, collector is case-grounded; MJ2501 emitter is input, collector is case-grounded. They are complementary in function, not pin-swappable.

What is the maximum safe operating area (SOA) limit at 100 °C case temperature?

At T_c = 100 °C, the MJ3001's maximum continuous collector current drops to 6.5 A due to thermal derating (150 W → ~85 W usable). Pulse SOA extends to 10 A for ≤300 µs pulses at 1.5% duty cycle, per datasheet test conditions.

Can MJ3001 be used without a heatsink?

No - even at 25 °C ambient, 150 W dissipation would raise junction temperature beyond 200 °C without heatsinking. Minimum recommended heatsink thermal resistance is 0.5 °C/W for continuous 100 W operation, assuming forced airflow or large aluminum chassis.

Does MJ3001 have built-in protection diodes?

No - the MJ3001 contains no integrated clamp or flyback diodes. External freewheeling diodes (e.g., 1N5408) must be added across inductive loads like motors or relays to prevent V_CE overshoot exceeding 80 V during turn-off.

MJ3001 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN - Darlington

Current - Collector (Ic) (Max):: 10 A

Voltage - Collector Emitter Breakdown (Max):: 80 V

Vce Saturation (Max) @ Ib, Ic:: 4V @ 50mA, 10A

Current - Collector Cutoff (Max):: 1mA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 1000 @ 5A, 3V

Power - Max:: 150 W

Frequency - Transition:: -

Operating Temperature:: 200°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Chassis Mount

Supplier Device Package:: TO-3

MJ3001 FAQ

1.How can I place an order for MJ3001 through Aetrix?

Please submit a Request for Quotation (RFQ) for MJ3001 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 MJ3001 reliable?

The price and inventory of MJ3001 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJ3001 is usually 5 days.

3.What payment methods are accepted for MJ3001?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJ3001 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJ3001?

MJ3001 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJ3001 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 MJ3001?

For technical support, including MJ3001 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJ3001 requirements.

6.How does Aetrix verify that MJ3001 is sourced from the original manufacturer or authorized distributors?

All MJ3001 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 MJ3001 meets industry standards.

7.What is the process for return or replacement of MJ3001?

All MJ3001 units undergo pre-shipment inspection (PSI). If there is an issue with MJ3001, 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 MJ3001 part is unused and in its original packaging.

Return procedure for MJ3001:

1.Submit a request within 90 days.

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

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