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

STMicroelectronics MJE2955T

Name: MJE2955T
Brand: STMicroelectronics
SKU: MJE2955T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJE2955T

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: MJE2955T.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:2,464

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Product details

Overview

MJE2955T from STMicroelectronics is a complementary PNP silicon epitaxial-base power transistor in TO-220 package, designed for high-current switching and linear amplification in DC-DC converters, motor drivers, and audio output stages. It delivers 10 A collector current, 60 V V_CEO, 75 W power dissipation at T_case ≤ 25 °C, and operates up to 150 °C junction temperature.

For engineers reviewing the MJE2955T datasheet, MJE2955T pinout, MJE2955T application, or MJE2955T equivalent, key selection criteria include its negative-polarity voltage/current ratings, thermal resistance (1.66 °C/W), DC current gain (h_FE = 20–70 at 4 A), saturation voltage (V_CE(sat) = 1.1 V at 4 A/0.4 A), and compatibility with MJE3055T in push-pull configurations.

Technical Context

The MJE2955T is a medium-power, through-hole PNP bipolar junction transistor optimized for robust operation in industrial switching and analog amplification. Its epitaxial base structure enables stable h_FE across temperature and current, while the TO-220 package provides direct heatsink mounting and low thermal resistance (R_thj-case = 1.66 °C/W).

It operates with negative polarity: V_CEO = –60 V, V_CBO = –70 V, I_C = –10 A, and P_tot = 75 W. The device supports pulsed operation (300 µs, ≤2% duty cycle) for sustaining voltage testing and exhibits f_T = 2 MHz under specified bias conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	–60 V: Maximum reverse-biased collector-emitter voltage before breakdown in common-emitter configuration.
I_C	–10 A: Continuous DC collector current rating at T_case ≤ 25 °C; defines maximum load-handling capability.
P_tot	75 W: Total power dissipation limit at case temperature ≤ 25 °C; determines heatsink sizing requirements.
R_thj-case	1.66 °C/W: Thermal resistance from junction to case; critical for calculating junction temperature rise under load.
h_FE	20–70: DC current gain range at I_C = 4 A, V_CE = 4 V; impacts base drive design and switching speed.
V_CE(sat)	1.1 V (at I_C = –4 A, I_B = –0.4 A): Saturation voltage defining conduction loss and heat generation in switch mode.
f_T	2 MHz: Transition frequency at I_C = –500 mA, V_CE = –10 V; indicates usable bandwidth in linear amplification.

Pinout & Package

Package: TO-220 (3-lead, vertical mounting, metal tab connected to collector). Standard JEDEC outline with mechanical dimensions per STMicroelectronics datasheet revision September 2003.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Current exit path for PNP device; connects to positive rail in high-side switch configurations.
2 (Base)	Control input	Receives negative base current to turn on; requires current-limiting resistor for safe drive.
3 (Collector)	Collector terminal / Heatsink interface	Internally connected to metal tab; must be electrically isolated from heatsink unless circuit design permits common-collector reference.

Key Features

Feature	Design Value
Complementary pairing	Designed as matched PNP counterpart to NPN MJE3055T for symmetrical push-pull and H-bridge circuits.
High ruggedness	Rated for 150 °C max junction temperature and 75 W dissipation, enabling reliable operation in industrial ambient conditions.
Low saturation voltage	V_CE(sat) = 1.1 V at –4 A/–0.4 A reduces conduction losses and improves efficiency in switching applications.
Epitaxial base construction	Ensures stable h_FE and consistent switching characteristics across temperature and current ranges.

Applications

DC-DC Converter Switch

Linear Audio Amplifier Output Stage

Use Scenario: High-current buck converter output stage operating at 24 V input, 5–12 V output, 5 A load.

IC Role / Device Role / Timing Role: PNP power switch in synchronous or complementary pair configuration, handling high-side current commutation.

Use Value: Low V_CE(sat) minimizes dropout and conduction loss; TO-220 package allows direct heatsinking for sustained 5 A operation.

Use Scenario: Class-AB audio amplifier output stage delivering 10 W into 4 Ω speaker load.

IC Role / Device Role / Timing Role: Complementary PNP emitter-follower output transistor paired with MJE3055T for symmetrical signal swing.

Use Value: Matched h_FE and thermal behavior with MJE3055T reduce crossover distortion; 150 °C T_j rating ensures reliability during transient peaks.

H-Bridge Motor Driver

Industrial Power Supply Regulator

Use Scenario: 24 V brushed DC motor driver with bidirectional control and 3 A stall current.

IC Role / Device Role / Timing Role: Upper-leg PNP switch in half-bridge leg, controlled via level-shifted base drive.

Use Value: –60 V V_CEO provides margin against inductive kickback; 10 A I_C rating accommodates short-term stall currents.

Use Scenario: Linear regulator pass element in 48 V to 12 V, 2 A industrial supply with thermal foldback protection.

IC Role / Device Role / Timing Role: Series pass transistor dissipating up to 72 W under worst-case dropout (36 V × 2 A).

Use Value: 75 W P_tot and 1.66 °C/W R_thj-case enable stable operation with moderate heatsinking; 150 °C T_j supports overtemperature tolerance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TIP2955	V_CEO = –60 V, I_C = –10 A, but h_FE min = 20 at I_C = –4 A - identical gain spec; R_thj-case = 1.67 °C/W vs. 1.66 °C/W.	No functional difference in switching or linear use; pinout and footprint identical to TO-220.	Drop-in replacement where second-source qualification is required; same thermal and electrical envelope.
2N6292	V_CEO = –60 V, I_C = –12 A, P_tot = 115 W - higher power rating; h_FE = 20–100 at I_C = –4 A.	Higher current/power capability suits heavier loads; larger die may affect switching speed and thermal response.	Select when >10 A peak current or >75 W dissipation is needed; verify base drive adequacy for higher h_FE spread.

Compared with TIP2955 and 2N6292, the MJE2955T offers tighter thermal resistance matching with its complementary NPN partner (MJE3055T), making it preferred for balanced push-pull designs where thermal tracking and gain symmetry are critical.

Availability

MJE2955T is available at Aetrix Electronics and suitable for DC-DC converters, audio amplifiers, motor drivers, and linear power supplies requiring stable component supply and long-lifecycle support.

Supply support for MJE2955T 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, specializing in power management, analog, microcontrollers, and discrete devices for industrial, automotive, and consumer markets.

The MJE2955T belongs to ST's legacy power bipolar transistor family, engineered for cost-effective, thermally robust solutions in industrial switching and analog amplification where reliability and manufacturability are prioritized.

FAQ

Is the MJE2955T pin-compatible with the MJE3055T?

No - they are complementary devices with opposite polarity: MJE2955T is PNP (Emitter=Pin1, Base=Pin2, Collector=Pin3), while MJE3055T is NPN (Collector=Pin1, Base=Pin2, Emitter=Pin3) in the same TO-220 package. Their pinouts are mirrored, not identical.

What is the maximum safe operating area (SOA) limitation for continuous DC operation?

At T_case = 25 °C, the MJE2955T supports up to 10 A at V_CE ≤ 7.5 V in DC mode. Above that voltage, derating applies per the SOA curve in the datasheet; at 60 V, maximum continuous I_C drops to ~1.25 A to stay within 75 W P_tot.

Can the metal tab be electrically connected to the heatsink without isolation?

No - the metal tab is internally connected to the collector terminal. Direct mounting to a grounded heatsink creates a short unless the collector node is at system ground potential. Electrical isolation using mica washers or sil-pad insulators is required in most configurations.

Does the MJE2955T require a base resistor when driven by a microcontroller GPIO?

Yes - driving the base directly from a 3.3 V or 5 V GPIO risks excessive base current. A series resistor (e.g., 220 Ω for ~15 mA I_B at 5 V) is required to limit I_B within the 6 A absolute maximum and ensure proper saturation at target I_C.

MJE2955T Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Active

Transistor Type:: PNP

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

MJE2955T FAQ

1.How can I place an order for MJE2955T through Aetrix?

Please submit a Request for Quotation (RFQ) for MJE2955T 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 MJE2955T reliable?

The price and inventory of MJE2955T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJE2955T is usually 5 days.

3.What payment methods are accepted for MJE2955T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJE2955T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJE2955T?

MJE2955T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJE2955T 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 MJE2955T?

For technical support, including MJE2955T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJE2955T requirements.

6.How does Aetrix verify that MJE2955T is sourced from the original manufacturer or authorized distributors?

All MJE2955T 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 MJE2955T meets industry standards.

7.What is the process for return or replacement of MJE2955T?

All MJE2955T units undergo pre-shipment inspection (PSI). If there is an issue with MJE2955T, 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 MJE2955T part is unused and in its original packaging.

Return procedure for MJE2955T:

1.Submit a request within 90 days.

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

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