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

STMicroelectronics MJE3055T

Name: MJE3055T
Brand: STMicroelectronics
SKU: MJE3055T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJE3055T

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: MJE3055T.pdf

Description:: TRANS NPN 60V 10A TO-220

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MJE3055T from STMicroelectronics is a silicon epitaxial-base NPN power transistor in TO-220 package, rated for 60 V V_CEO, 10 A I_C, and 75 W P_tot at T_case ≤ 25 °C. It serves as a high-current switching device in linear regulators, motor drivers, and audio output stages.

For engineers reviewing the MJE3055T datasheet, MJE3055T pinout, MJE3055T application, or MJE3055T equivalent, key selection criteria include V_CEO sustain capability, h_FE linearity at 4–10 A, thermal resistance (R_thj-case = 1.66 °C/W), and complementary pairing with MJE2955T in push-pull amplifier designs.

Technical Context

This NPN bipolar junction transistor uses epitaxial base construction to support stable DC current gain (h_FE = 20–70) across 4–10 A collector current and 4 V V_CE. Its 60 V V_CEO(sus) rating enables use in 48 V rail switching and inductive load control with flyback energy management.

The device operates up to 150 °C junction temperature and features low V_CE(sat) (1.1 V at 4 A/0.4 A drive; 8 V at 10 A/3.3 A), supporting efficient conduction in both linear and saturated switching modes without secondary breakdown limitations under pulsed conditions (300 µs, ≤2% duty).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - Maximum safe collector-emitter voltage with base open; defines upper limit for DC supply rails in switching applications.
I_C	10 A - Continuous collector current rating at T_case ≤ 25 °C; determines maximum load-handling capacity in power stages.
P_tot	75 W - Total power dissipation at case temperature ≤25 °C; sets heatsink sizing baseline for thermal design.
R_thj-case	1.66 °C/W - Junction-to-case thermal resistance; used to calculate ΔT_j-case = P_diss × 1.66 for thermal margining.
h_FE	20–70 - DC current gain at I_C = 4–10 A and V_CE = 4 V; critical for base drive sizing in linear amplifiers and switch drivers.
f_T	2 MHz - Transition frequency at I_C = 500 mA, V_CE = 10 V, f = 500 kHz; indicates usable bandwidth for audio-frequency amplification.

Pinout & Package

TO-220 package: 3-lead, vertical mounting, metal tab electrically connected to collector (Pin 2). Requires insulated mounting hardware when collector is not at chassis ground.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Low-impedance output node; connects to load return or ground reference in common-emitter configurations.
2 (Collector)	Current source terminal	Internally bonded to metal tab; must be electrically isolated from heatsink unless system ground reference permits direct attachment.
3 (Base)	Control input	Receives forward-biased drive current (I_B ≤ 6 A); requires series resistor or current-limited driver to avoid overdrive.

Key Features

Feature	Design Value
Complementary pairing	Matched with MJE2955T (PNP) for Class-B/AB audio output stages and H-bridge drivers with symmetrical gain and thermal tracking.
V_CEO(sus) rating	60 V sustained under pulsed conditions - enables reliable operation with inductive kickback in relay and solenoid drivers without snubber networks.
High I_C capability	10 A continuous collector current - supports single-transistor switching of loads up to ~500 W at 50 V with appropriate heatsinking.
Low R_thj-case	1.66 °C/W - allows compact thermal design; e.g., 30 W dissipation yields only ~50 °C junction rise above case temperature.

Applications

Audio Power Amplifier

DC Motor Driver

Use Scenario: Output stage in discrete Class-AB audio amplifiers delivering 20–50 W into 4–8 Ω speakers.

IC Role / Device Role / Timing Role: NPN power switch in push-pull pair with MJE2955T; handles positive half-cycle current delivery.

Use Value: Linear h_FE stability (20–70) and low V_CE(sat) minimize crossover distortion and conduction loss at full output swing.

Use Scenario: Unidirectional drive for brushed DC motors in industrial actuators and conveyor systems (24–48 V, ≤10 A).

IC Role / Device Role / Timing Role: High-side or low-side switching element controlled by PWM microcontroller output via base driver.

Use Value: 60 V V_CEO margin accommodates back-EMF spikes; 10 A I_C rating supports peak stall currents without derating.

Linear Voltage Regulator

Relay/Solenoid Driver

Use Scenario: Pass transistor in adjustable 3–40 V, 5–8 A linear regulators for test equipment and lab power supplies.

IC Role / Device Role / Timing Role: Series pass element dissipating excess input-output differential as heat; biased in active region.

Use Value: 75 W P_tot and 150 °C T_jmax enable robust operation under worst-case dropout (e.g., 40 V_in – 5 V_out) at full load.

Use Scenario: Driving 24 V/5 A industrial relays and 48 V/3 A solenoids in PLC I/O modules and HVAC controls.

IC Role / Device Role / Timing Role: Saturated switch controlling coil current; turned on/off by logic-level base signal.

Use Value: V_CEO(sus) = 60 V ensures immunity to >100 V inductive flyback transients without clamping diodes in many cases.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TIP3055	V_CEO = 60 V, I_C = 15 A, P_tot = 90 W, R_thj-case = 1.4 °C/W - higher current/power but slightly lower h_FE min (10 vs. 20).	Preferred where peak current exceeds 10 A or thermal headroom is constrained; less suitable for precision linear gain-critical stages.	Select when higher overload tolerance is required and base drive can accommodate lower h_FE.
2N3055	V_CEO = 60 V, I_C = 15 A, P_tot = 115 W, R_thj-case = 1.25 °C/W - legacy metal-can package; higher power but larger footprint and no built-in thermal pad.	Used in retrofits and high-reliability analog power supplies; incompatible with surface-mount heatsink interfaces due to TO-3 mechanical form.	Choose for heritage designs or where TO-3 mounting is standardized; avoid if TO-220 footprint or thermal interface is mandatory.

Compared with TIP3055 and 2N3055, the MJE3055T offers tighter h_FE consistency at mid-current (4–10 A) and optimized TO-220 thermal interface, making it preferable for modern PCB-mounted linear amplifiers and regulated supplies where gain predictability and heatsink compatibility are prioritized over absolute max ratings.

Availability

MJE3055T is available at Aetrix Electronics and suitable for audio power amplifiers, DC motor drivers, linear voltage regulators, and relay/solenoid drivers requiring stable component supply and long-term industrial availability.

Supply support for MJE3055T 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, Switzerland, designing and manufacturing analog, power, MCU, and sensor solutions for automotive, industrial, and consumer markets.

The MJE3055T belongs to ST's legacy power bipolar transistor family, engineered specifically for cost-sensitive, high-reliability linear and switching power applications in industrial controls and audio systems.

FAQ

Is the MJE3055T RoHS compliant?

Yes, the MJE3055T is RoHS compliant per STMicroelectronics' official product documentation dated September 2003 and subsequent revisions. It contains no lead in solderable terminations and meets EU Directive 2011/65/EU requirements for restricted substances, including cadmium, mercury, hexavalent chromium, PBB, and PBDE.

Can MJE3055T be used in parallel configurations?

Yes, but only with emitter ballast resistors (typically 0.1–0.47 Ω) to ensure current sharing. The device's positive temperature coefficient of V_BE(on) supports inherent thermal stability, yet mismatched h_FE and thermal gradients require external balancing for reliable multi-device operation above 15 A total current.

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

At T_case = 100 °C, the SOA is limited by second breakdown to approximately 4 A at 40 V (160 W) for DC operation. Derating follows the 1.66 °C/W thermal resistance curve: P_max = (150 − 100) / 1.66 ≈ 30 W, requiring strict adherence to published SOA graphs in the ST datasheet for pulse and transient conditions.

Does the metal tab connect to collector internally?

Yes, Pin 2 (collector) is directly bonded to the metal tab in the TO-220 package. This requires electrical isolation (e.g., mica washer + shoulder washer) when mounting to a grounded heatsink, unless the collector node is intentionally tied to system ground in the circuit topology.

MJE3055T Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Active

Transistor Type:: NPN

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

Voltage - Collector Emitter Breakdown (Max):: 60 V

Vce Saturation (Max) @ Ib, Ic:: 8V @ 3.3A, 10A

Current - Collector Cutoff (Max):: 700µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 20 @ 4A, 4V

Power - Max:: 75 W

Frequency - Transition:: 2MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

MJE3055T FAQ

1.How can I place an order for MJE3055T through Aetrix?

Please submit a Request for Quotation (RFQ) for MJE3055T 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 MJE3055T reliable?

The price and inventory of MJE3055T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJE3055T is usually 5 days.

3.What payment methods are accepted for MJE3055T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJE3055T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJE3055T?

MJE3055T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJE3055T 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 MJE3055T?

For technical support, including MJE3055T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJE3055T requirements.

6.How does Aetrix verify that MJE3055T is sourced from the original manufacturer or authorized distributors?

All MJE3055T 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 MJE3055T meets industry standards.

7.What is the process for return or replacement of MJE3055T?

All MJE3055T units undergo pre-shipment inspection (PSI). If there is an issue with MJE3055T, 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 MJE3055T part is unused and in its original packaging.

Return procedure for MJE3055T:

1.Submit a request within 90 days.

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

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