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

STMicroelectronics MJD44H11T4-A

Name: MJD44H11T4-A
Brand: STMicroelectronics
SKU: MJD44H11T4-A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJD44H11T4-A

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: MJD44H11T4-A.pdf

Description:: TRANS NPN 80V 8A DPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MJD44H11T4-A from STMicroelectronics is an NPN complementary power transistor in TO-252 (DPAK) package, rated for 80 V V_CEO, 8 A continuous collector current, and 20 W total dissipation at T_case = 25 °C; designed for automotive-grade linear amplification and switching circuits requiring low V_CE(sat) and fast turn-on/turn-off.

For engineers reviewing the MJD44H11T4-A datasheet, MJD44H11T4-A pinout, MJD44H11T4-A application, or MJD44H11T4-A equivalent, key selection criteria include its 60–40 h_FE range across 2–4 A I_C, 1 V max V_CE(sat) at 8 A/0.4 A drive, and qualified AEC-Q101 compliance for under-hood power stages.

Technical Context

This NPN bipolar junction transistor uses low-voltage multi-epitaxial planar technology to achieve stable DC gain (h_FE ≥ 60 at I_C = 2 A, V_CE = 1 V) and low saturation voltage (≤1 V at I_C = 8 A, I_B = 0.4 A). Its safe operating area supports pulsed switching up to 16 A peak collector current with 6.25 °C/W junction-to-case thermal resistance.

The device operates within a −55 to +150 °C storage and junction temperature range, and features 5 V V_EBO and 10 µA I_CES at V_CE = 80 V - confirming suitability for high-reliability linear amplifier biasing and hard-switched load control where leakage and breakdown margins are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - maximum blocking voltage before avalanche in common-emitter configuration, enabling use in 48 V automotive power rails.
I_C (continuous)	8 A - sustained collector current capability at T_case = 25 °C, supporting medium-power output stages without forced cooling.
V_CE(sat)	≤1 V at I_C = 8 A / I_B = 0.4 A - low conduction loss reduces heat generation in saturated switching applications.
h_FE	60 min at I_C = 2 A, V_CE = 1 V - sufficient current gain for direct TTL/CMOS driver interfacing without additional pre-driver stages.
R_thJC	6.25 °C/W - enables thermal design predictability when mounted on PCB copper pour or heatsinked DPAK footprint.
T_J(max)	150 °C - junction temperature limit aligned with AEC-Q101 automotive qualification for under-hood deployment.

Pinout & Package

Package: TO-252 (DPAK), surface-mount, tape-and-reel (suffix "T4"), with exposed tab electrically connected to collector. Dimensions per ST mechanical drawing 0068772_G: 6.6 mm × 10.2 mm body, 2.3 mm height, 0.6 mm lead thickness.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Low-impedance path for emitter current return; requires low-inductance PCB trace routing in high-dI/dt switching.
2 (Base)	Control input	Receives forward-biased drive current (0.4–0.8 A typical) to saturate transistor; needs series resistor for current limiting.
3 (Collector)	Main current path output	Connected to exposed metal tab; must be thermally anchored to PCB copper pour or heatsink for 20 W dissipation.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive applications including engine control modules and body electronics with extended temperature cycling and humidity testing.
Low V_CE(sat)	≤1 V at full 8 A load ensures <1.6 W conduction loss, reducing thermal stress in compact power stages.
Fast switching speed	Enables PWM operation up to ~100 kHz in Class AB amplifiers and DC-DC pre-regulators without excessive switching loss.
TO-252 (DPAK) package	Surface-mountable with high thermal efficiency and mechanical robustness; compatible with standard reflow profiles and automated assembly.

Applications

Automotive Power Amplifier

Industrial Motor Driver Stage

Use Scenario: Audio power output stage in vehicle infotainment head units driving 4 Ω speakers.

IC Role / Device Role / Timing Role: NPN output switch in complementary push-pull pair, delivering up to 20 W RMS into speaker load.

Use Value: Low V_CE(sat) minimizes crossover distortion and thermal drift, while AEC-Q101 rating ensures reliability over 15-year vehicle lifetime.

Use Scenario: High-side switch in 24 V industrial valve actuator control circuit.

IC Role / Device Role / Timing Role: Linear-mode current regulator controlling solenoid coil current with analog feedback.

Use Value: Stable h_FE across temperature allows precise current setting without digital compensation; 80 V rating accommodates inductive kickback suppression.

DC-DC Converter Pre-regulator

LED Driver for Commercial Lighting

Use Scenario: Buck converter primary switch in 48 V input telecom power supply.

IC Role / Device Role / Timing Role: Hard-switched NPN transistor operating at 50–100 kHz with external base drive.

Use Value: Fast switching and low R_thJC enable efficient operation at 8 A peak without active cooling, reducing BOM cost vs. MOSFET solutions.

Use Scenario: Constant-current linear LED driver for architectural lighting fixtures.

IC Role / Device Role / Timing Role: Series pass element regulating current through 10–20 high-brightness LEDs in series string.

Use Value: 150 °C T_J(max) and 20 W dissipation support 3–5 W thermal load in enclosed housings without derating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD44H11RL	Same die, bulk packaging (tube) instead of tape-and-reel; identical electrical specs and thermal performance.	No reel handling required; suitable for low-volume prototyping or manual assembly.	Select when automated pick-and-place is not used and cost-per-unit is prioritized over logistics compatibility.
BD249C	Lower V_CEO (45 V), lower h_FE (40 min), higher V_CE(sat) (1.5 V), TO-126 package with inferior thermal resistance (10 °C/W).	Limited to 24 V systems; unsuitable for automotive 48 V or high-efficiency switching.	Choose only for legacy designs or cost-sensitive non-automotive applications where voltage and thermal margins are relaxed.

Compared with MJD44H11RL, the T4-A variant offers optimized SMT logistics; versus BD249C, it delivers superior voltage rating, lower saturation loss, and 39% better thermal performance - making it the preferred choice for new automotive and industrial power designs requiring reliability and efficiency.

Availability

MJD44H11T4-A is available at Aetrix Electronics and suitable for automotive power amplifiers, industrial motor drivers, DC-DC pre-regulators, and LED constant-current drivers requiring stable component supply and AEC-Q101-compliant sourcing.

Supply support for MJD44H11T4-A 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 microcontrollers, power transistors, sensors, and analog ICs for automotive, industrial, and consumer markets.

MJD44H11T4-A belongs to ST's high-voltage, high-current bipolar transistor product line, engineered specifically for ruggedized linear and switching power applications in harsh environments - especially automotive under-hood and industrial control systems.

FAQ

Is MJD44H11T4-A pin-compatible with MJD45H11T4-A?

No - MJD44H11T4-A is NPN and MJD45H11T4-A is PNP; they share identical TO-252 package pinout (Emitter-Base-Collector) but opposite polarity. They are intended as complementary pairs in push-pull circuits, not drop-in replacements. Interchanging them without circuit redesign will cause immediate failure due to reversed biasing.

What is the recommended base drive for saturation at 8 A collector current?

ST specifies I_B = 0.4 A to achieve V_CE(sat) ≤ 1 V at I_C = 8 A. A 10 Ω series resistor with 5 V logic drive delivers ~0.5 A base current, satisfying this requirement. Ensure base drive source can sustain 0.4 A continuously and include a reverse-biased diode across base-emitter to prevent negative voltage during switching transients.

Does MJD44H11T4-A require a heatsink in 20 W operation?

Yes - at 20 W dissipation and R_thJC = 6.25 °C/W, junction temperature rise above case is 125 °C. With T_case = 25 °C, T_J reaches 150 °C (maximum rated). A heatsink lowering R_thCA to ≤ 5 °C/W is required to maintain safe margin below T_J(max) under continuous load.

Can MJD44H11T4-A be used in avalanche mode?

No - the datasheet does not specify avalanche energy rating (E_AS) or ruggedness testing. V_CEO(sus) = 80 V is a sustaining voltage under pulsed conditions, not an avalanche breakdown rating. Operation beyond V_CEO risks irreversible damage; external clamping (e.g., TVS diode) is mandatory for inductive load switching.

MJD44H11T4-A Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 8 A

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

Vce Saturation (Max) @ Ib, Ic:: 1V @ 400mA, 8A

Current - Collector Cutoff (Max):: 10µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 4A, 1V

Power - Max:: 20 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

MJD44H11T4-A FAQ

1.How can I place an order for MJD44H11T4-A through Aetrix?

Please submit a Request for Quotation (RFQ) for MJD44H11T4-A 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 MJD44H11T4-A reliable?

The price and inventory of MJD44H11T4-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJD44H11T4-A is usually 5 days.

3.What payment methods are accepted for MJD44H11T4-A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJD44H11T4-A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJD44H11T4-A?

MJD44H11T4-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJD44H11T4-A 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 MJD44H11T4-A?

For technical support, including MJD44H11T4-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJD44H11T4-A requirements.

6.How does Aetrix verify that MJD44H11T4-A is sourced from the original manufacturer or authorized distributors?

All MJD44H11T4-A 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 MJD44H11T4-A meets industry standards.

7.What is the process for return or replacement of MJD44H11T4-A?

All MJD44H11T4-A units undergo pre-shipment inspection (PSI). If there is an issue with MJD44H11T4-A, 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 MJD44H11T4-A part is unused and in its original packaging.

Return procedure for MJD44H11T4-A:

1.Submit a request within 90 days.

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

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