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

STMicroelectronics MJB44H11T4-A

Name: MJB44H11T4-A
Brand: STMicroelectronics
SKU: MJB44H11T4-A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJB44H11T4-A

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: MJB44H11T4-A.pdf

Description:: TRANS NPN 80V 10A D2PAK

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Product details

Overview

MJB44H11T4-A from STMicroelectronics is an AEC-Q101-qualified NPN power transistor in D²PAK (TO-263) package, rated for 80 V V_CEO, 10 A I_C, and 50 W P_TOT at T_C = 25 °C; it delivers low 1 V V_CE(sat) at 8 A/0.4 A drive and high h_FE ≥ 60 @ 2 A, used in automotive power amplifiers and DC-DC switching circuits.

For engineers reviewing the MJB44H11T4-A datasheet, MJB44H11T4-A pinout, MJB44H11T4-A application, or MJB44H11T4-A equivalent, key selection criteria include its AEC-Q101 qualification, 2.5 °C/W R_thJC, fast switching capability, and suitability for high-current linear and saturated-switching roles in under-hood automotive modules.

Technical Context

This NPN bipolar junction transistor employs planar low-voltage technology with double metal process to achieve high current gain and low saturation voltage simultaneously. Its safe operating area supports pulsed IC up to 20 A and DC operation up to 10 A with thermal derating above 25 °C case temperature.

The device operates with V_BE(sat) ≤ 1.5 V at 8 A collector current and 0.8 A base drive, enabling efficient gate driving of downstream stages. Junction-to-case thermal resistance of 2.5 °C/W allows direct heatsink mounting for high-power dissipation in compact automotive enclosures.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - maximum blocking voltage in common-emitter configuration, suitable for 48 V automotive rail switching
I_C	10 A - continuous collector current rating at T_C = 25 °C, defines steady-state power stage capacity
V_CE(sat)	1 V max @ 8 A/0.4 A - enables <1 W conduction loss at full load, critical for thermal management
h_FE	60 min @ 2 A - ensures robust base drive margin and stable current amplification in analog amplifier stages
R_thJC	2.5 °C/W - allows direct thermal path to heatsink, supporting >30 W dissipation at ΔT = 75 °C
T_J(max)	150 °C - junction temperature limit compatible with under-hood automotive environments
Package	D²PAK (TO-263) - surface-mount power package with exposed tab for thermal and electrical connection to PCB ground plane

Pinout & Package

D²PAK (TO-263) package with 3 terminals: Pin 1 = Base, Pin 2 = Collector (exposed tab), Pin 3 = Emitter. The metal tab is electrically connected to the collector and serves as primary thermal interface.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (B)	Base	Current-controlled input terminal; requires ~0.4 A drive for full 8 A saturation, compatible with standard logic-level drivers
Pin 2 (TAB/C)	Collector (exposed tab)	Main power input and thermal interface; must be soldered to large copper pour or heatsink for R_thJC = 2.5 °C/W performance
Pin 3 (E)	Emitter	Reference node for output current; connects to ground or low-side return path in switching topologies

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive applications including engine control, body electronics, and ADAS power stages
Low V_CE(sat)	≤1 V at 8 A enables <8 W conduction loss, reducing heatsink size and system cost
High h_FE	≥60 @ 2 A provides stable gain across temperature, minimizing base drive circuit complexity
Fast switching speed	Supported by low stored charge and optimized doping profile, enabling >100 kHz PWM operation
Robust SOA	Pulsed safe operating area extends to 20 A/80 V, accommodating inductive load transients

Applications

Automotive Power Amplifier

DC-DC Converter Switch

Use Scenario: Linear audio output stage in vehicle infotainment head units delivering 20–50 W into 4 Ω loads.

IC Role / Device Role / Timing Role: NPN power transistor operating in Class AB mode, amplifying analog audio signals with minimal crossover distortion.

Use Value: High h_FE and low V_CE(sat) reduce bias network complexity and improve thermal stability during sustained output.

Use Scenario: Low-side switch in 12 V–48 V automotive buck converters powering ADAS cameras and radar modules.

IC Role / Device Role / Timing Role: Saturated-switching element controlling energy transfer to output inductor at 200–500 kHz PWM frequency.

Use Value: 1 V V_CE(sat) limits conduction loss to <8 W at 8 A, enabling compact thermally constrained PCB layouts.

Motor Driver H-Bridge Leg

Ignition Coil Driver

Use Scenario: High-current leg in brushed DC motor driver for HVAC blower or power seat actuation.

IC Role / Device Role / Timing Role: NPN switch handling bidirectional 10 A peak currents with flyback diode protection.

Use Value: 150 °C T_J(max) and AEC-Q101 qualification ensure reliability during extended stall conditions and thermal cycling.

Use Scenario: Primary-side switch in gasoline engine ignition coil drivers requiring fast turn-off and high dV/dt immunity.

IC Role / Device Role / Timing Role: High-voltage, high-current switch energizing ignition coil primary winding with precise timing control.

Use Value: 80 V V_CEO and fast switching support 400–600 V inductive kickback suppression without snubber overhead.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STN9360	Lower V_CEO (60 V), higher V_CE(sat) (1.2 V), same D²PAK package	Not suitable for 48 V systems requiring 80 V blocking margin	Select only for 12/24 V-only designs where lower cost outweighs voltage headroom loss
ON Semiconductor MJD122G	Same V_CEO (80 V), but TO-220 package, R_thJC = 3.0 °C/W, no AEC-Q101 qualification	Lacks automotive qualification and thermal performance for under-hood use	Acceptable for industrial non-automotive switching if board space permits through-hole mounting

Compared with STN9360 and MJD122G, MJB44H11T4-A uniquely combines AEC-Q101 compliance, 80 V rating, 2.5 °C/W thermal resistance, and 1 V saturation voltage-making it the only choice for thermally demanding, safety-critical automotive power stages requiring surface-mount scalability.

Availability

MJB44H11T4-A is available at Aetrix Electronics and suitable for automotive power amplifiers, DC-DC converters, motor drivers, and ignition systems requiring stable component supply across multi-year production cycles.

Supply support for MJB44H11T4-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 automotive-grade ICs for industrial and transportation markets.

MJB44H11T4-A belongs to ST's automotive-qualified bipolar power transistor product line, engineered specifically for high-reliability, high-current linear and switching functions in engine, chassis, and infotainment subsystems.

FAQ

Is MJB44H11T4-A pin-compatible with TO-220 NPN transistors like BD249C?

No. MJB44H11T4-A uses D²PAK (TO-263) surface-mount packaging with pinout Base–Collector–Emitter (1–2–3), while BD249C uses TO-220 through-hole with E–B–C arrangement. Footprint, thermal interface, and soldering process are incompatible without redesign.

What is the maximum allowable case temperature for continuous 10 A operation?

At 10 A I_C, P_D ≈ 10 W (using V_CE(sat) = 1 V). With R_thJC = 2.5 °C/W, ΔT = 25 °C, so T_C must not exceed 125 °C to maintain T_J ≤ 150 °C. Derating begins above T_C = 25 °C per Figure 2 in DS10331.

Does MJB44H11T4-A require a base resistor when driven by a 3.3 V MCU GPIO?

Yes. With V_BE(sat) ≤ 1.5 V and required I_B = 0.4–0.8 A for full saturation, a 3.3 V GPIO cannot directly drive the base. A dedicated driver IC (e.g., STMicroelectronics TS1100) or Darlington stage is mandatory to supply sufficient base current.

Can MJB44H11T4-A replace MJB44H11 in existing designs?

Yes-MJB44H11T4-A is the tape-and-reel variant of MJB44H11, sharing identical electrical specs, package, and marking (MJB44H11). The "T4-A" suffix denotes packaging format and AEC-Q101 qualification level; no circuit or layout changes are needed for drop-in replacement.

MJB44H11T4-A Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 10 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:: 50 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

MJB44H11T4-A FAQ

1.How can I place an order for MJB44H11T4-A through Aetrix?

Please submit a Request for Quotation (RFQ) for MJB44H11T4-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 MJB44H11T4-A reliable?

The price and inventory of MJB44H11T4-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJB44H11T4-A is usually 5 days.

3.What payment methods are accepted for MJB44H11T4-A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJB44H11T4-A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJB44H11T4-A?

MJB44H11T4-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJB44H11T4-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 MJB44H11T4-A?

For technical support, including MJB44H11T4-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJB44H11T4-A requirements.

6.How does Aetrix verify that MJB44H11T4-A is sourced from the original manufacturer or authorized distributors?

All MJB44H11T4-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 MJB44H11T4-A meets industry standards.

7.What is the process for return or replacement of MJB44H11T4-A?

All MJB44H11T4-A units undergo pre-shipment inspection (PSI). If there is an issue with MJB44H11T4-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 MJB44H11T4-A part is unused and in its original packaging.

Return procedure for MJB44H11T4-A:

1.Submit a request within 90 days.

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

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