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

STMicroelectronics MJD47T4

Name: MJD47T4
Brand: STMicroelectronics
SKU: MJD47T4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJD47T4

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

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

Datasheet:: MJD47T4.pdf

Description:: TRANS NPN 250V 1A DPAK

Quantity:: RFQ Add To RFQ list

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Inventory:9,907

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Product details

Overview

MJD47T4 from STMicroelectronics is a high-voltage fast-switching NPN power transistor in TO-252 (DPAK) surface-mount package, rated for 250 V V_CEO, 1 A I_C, and 15 W P_tot at T_c = 25 °C; used in switch-mode power supplies and audio amplifier output stages.

For engineers reviewing the MJD47T4 datasheet, MJD47T4 pinout, MJD47T4 application, or MJD47T4 equivalent, key selection criteria include V_CEO(sus) = 250 V, h_FE = 30–150 at I_C = 0.3–1 A, V_CE(sat) = 1 V @ I_C = 1 A/I_B = 0.2 A, and R_thj-case = 8.33 °C/W for thermal design in high-reliability power switching.

Technical Context

The MJD47T4 employs Medium Voltage Epitaxial Planar technology to achieve ruggedness and stable high-voltage operation up to 350 V V_CBO. Its fast-switching capability is enabled by low C_ob, 300 µs pulse-rated f_T = 10 MHz, and controlled saturation characteristics.

Designed for DC and pulsed power switching, it supports I_CM = 2 A peak current with 1.5% duty cycle, and operates safely up to T_j = 150 °C with derated SOA curves defined for inductive loads.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	250 V - Maximum continuous collector-emitter voltage under open-base condition; defines safe blocking capability in SMPS primary-side switches.
I_C	1 A - Continuous DC collector current at T_c = 25 °C; sets steady-state conduction limit in linear and switching modes.
P_tot	15 W - Total power dissipation at case temperature 25 °C; determines heatsink sizing when mounted on PCB copper area ≥ 10 cm².
h_FE	30–150 - DC current gain range at I_C = 0.3–1 A; enables predictable base drive design for saturated switching or analog amplification.
V_CE(sat)	1 V @ I_C = 1 A / I_B = 0.2 A - Low saturation voltage minimizes conduction loss in hard-switched topologies.
R_thj-case	8.33 °C/W - Junction-to-case thermal resistance; allows direct calculation of junction temperature rise above heatsink temperature.

Pinout & Package

TO-252 (DPAK) surface-mount package with exposed drain-connected tab for thermal and electrical grounding; standard 3-pin configuration (Emitter, Base, Collector/Tab).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Emitter)	Emitter terminal	Low-impedance current return path; connected to ground or negative rail in common-emitter configurations.
Pin 2 (Base)	Control input	Receives forward-biased drive current (I_B ≤ 0.6 A) to saturate or cut off the transistor.
Pin 3 (Collector / Tab)	High-voltage output / thermal interface	Electrically tied to collector; soldered to large copper pour for heat dissipation and EMI shielding.

Key Features

Feature	Design Value
High-voltage blocking	V_CBO = 350 V ensures robust operation in 230 VAC rectified bus applications without derating.
Fast switching performance	f_T = 10 MHz and pulsed switching time specs support >100 kHz SMPS operation with minimal turn-off tail.
Rugged SOA	Defined Safe Operating Area curves for inductive loads enable reliable operation in flyback and forward converter topologies.
Thermal efficiency	R_thj-case = 8.33 °C/W allows 15 W dissipation with ≤125 °C junction rise over 25 °C case temperature.

Applications

Switch-Mode Power Supplies

Audio Amplifiers

Use Scenario: Primary-side switching transistor in offline 20–60 W flyback converters with 230 VAC input.

IC Role / Device Role / Timing Role: High-voltage NPN switch controlling energy transfer via transformer primary winding.

Use Value: 250 V V_CEO and 2 A I_CM support universal-input designs with margin against line surges and inductive kickback.

Use Scenario: Output stage driver in Class AB audio power amplifiers delivering 10–20 W into 4–8 Ω loads.

IC Role / Device Role / Timing Role: Linear-mode power transistor amplifying audio signal with low V_CE(sat) and stable h_FE.

Use Value: h_FE = 30–150 across operating current ensures consistent bias stability and low distortion at mid-power levels.

General-Purpose Switching

DC Motor Control

Use Scenario: Relay replacement or solenoid driver in industrial control panels operating from 24–48 VDC rails.

IC Role / Device Role / Timing Role: Saturated switch turning ON/OFF inductive loads with flyback diode protection.

Use Value: V_CEO(sus) = 250 V and 15 W P_tot allow reliable 48 V system operation with transient immunity.

Use Scenario: H-bridge half-bridge leg in brushed DC motor drivers for robotics and automation equipment.

IC Role / Device Role / Timing Role: Unidirectional power switch controlling motor direction and speed via PWM.

Use Value: Fast switching (f_T = 10 MHz) and low V_CE(sat) reduce PWM conduction losses and thermal stress during continuous duty.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TIP47	Same V_CEO = 250 V, but TO-220 package; higher R_thj-case = 10 °C/W; h_FE min = 20 vs. 30 for MJD47T4.	Requires through-hole PCB layout and larger heatsink; less suitable for space-constrained SMT designs.	Select TIP47 only if legacy through-hole assembly or higher single-pulse surge tolerance is required.
MJD127	Complementary PNP device; identical TO-252 package and V_CEO = 250 V, but opposite polarity and h_FE = 25–120.	Used in push-pull or complementary symmetry amplifier outputs, not direct NPN replacement.	Choose MJD127 only for matched pair designs requiring complementary switching or linear amplification.

Compared with TIP47 and MJD127, the MJD47T4 offers superior thermal performance in SMT form factor, tighter h_FE consistency for predictable base drive, and optimized SOA for modern high-frequency SMPS layouts.

Availability

MJD47T4 is available at Aetrix Electronics and suitable for switch-mode power supplies, audio amplifiers, and general-purpose industrial switching requiring stable component supply and long-term manufacturability.

Supply support for MJD47T4 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 MJD47T4 belongs to ST's high-voltage bipolar power transistor product line, engineered specifically for cost-sensitive, thermally demanding power conversion and amplification applications where reliability and ruggedness are critical.

FAQ

What is the maximum junction temperature for the MJD47T4?

The absolute maximum operating junction temperature is 150 °C, as specified in the Absolute Maximum Ratings table. Operation beyond this limit risks permanent degradation of the epitaxial structure and gain instability. Thermal design must ensure T_j remains below 150 °C under worst-case ambient and power dissipation conditions, using R_thj-case = 8.33 °C/W and measured case temperature.

Is the MJD47T4 pin-compatible with the TIP47?

No - the MJD47T4 uses a 3-pin TO-252 (DPAK) surface-mount package with emitter-base-collector pinout, while the TIP47 uses a 3-pin TO-220 through-hole package with collector-base-emitter pinout. Physical mounting, thermal path, and PCB footprint are incompatible; no direct board-level substitution is possible without layout revision.

Does the MJD47T4 require a base resistor in switching applications?

Yes - a series base resistor is mandatory to limit I_B within its 0.6 A continuous and 1.2 A peak rating. For I_C = 1 A saturation, typical design uses I_B = 0.2 A, requiring ~15 Ω when driven from 3.3 V logic or ~47 Ω from 5 V, accounting for V_BE(on) ≈ 1.5 V and driver output impedance.

Can the MJD47T4 be used in linear amplifier mode?

Yes - its specified h_FE, V_CE(sat), and SOA curves support linear operation in Class A or AB audio output stages. However, continuous linear use demands strict thermal management: at 5 W dissipation, junction temperature rises ~42 °C above case, requiring adequate copper area and airflow to stay within 150 °C T_j limit.

MJD47T4 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):: 1 A

Voltage - Collector Emitter Breakdown (Max):: 250 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 200mA, 1A

Current - Collector Cutoff (Max):: 100µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 30 @ 300mA, 10V

Power - Max:: 15 W

Frequency - Transition:: 10MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

MJD47T4 FAQ

1.How can I place an order for MJD47T4 through Aetrix?

Please submit a Request for Quotation (RFQ) for MJD47T4 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 MJD47T4 reliable?

The price and inventory of MJD47T4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJD47T4 is usually 5 days.

3.What payment methods are accepted for MJD47T4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJD47T4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJD47T4?

MJD47T4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJD47T4 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 MJD47T4?

For technical support, including MJD47T4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJD47T4 requirements.

6.How does Aetrix verify that MJD47T4 is sourced from the original manufacturer or authorized distributors?

All MJD47T4 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 MJD47T4 meets industry standards.

7.What is the process for return or replacement of MJD47T4?

All MJD47T4 units undergo pre-shipment inspection (PSI). If there is an issue with MJD47T4, 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 MJD47T4 part is unused and in its original packaging.

Return procedure for MJD47T4:

1.Submit a request within 90 days.

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

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