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

onsemi MJD148T4G

Name: MJD148T4G
Brand: onsemi
SKU: MJD148T4G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJD148T4G

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: MJD148T4G.pdf

Description:: TRANS NPN 45V 4A DPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MJD148T4G from onsemi is an NPN silicon power transistor in DPAK (TO-252) surface-mount package, rated for 45 V_CEO, 4.0 A continuous collector current, and 20 W power dissipation at T_C = 25°C. It delivers high DC current gain (h_FE = 50–375 at I_C = 0.5–3 A), low V_CE(sat) ≤ 0.5 V at I_C = 2 A / I_B = 0.2 A, and f_T = 3 MHz - optimized for general-purpose amplification and low-speed switching in industrial power supplies and motor control stages.

For engineers reviewing the MJD148T4G datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q101 qualification, Pb-free RoHS-compliant DPAK-3 package with dual collector terminals, thermal resistance R_JC = 6.25°C/W, and validated performance across −55°C to +150°C junction temperature range.

Technical Context

This NPN bipolar junction transistor operates in linear amplification and saturated switching modes, with base-emitter turn-on voltage V_BE(on) ≤ 1.1 V at I_C = 2 A and V_CE = 1 V. Its safe operating area (SOA) is defined by thermal limits and second-breakdown constraints up to 150°C peak junction temperature, supported by transient thermal impedance data in Figure 9 of the datasheet.

The device uses epitaxial planar construction with epoxy meeting UL 94 V-0 flammability rating. It features dual collector terminals (pins 2 and 4) for enhanced current handling and thermal spreading, and is qualified per AEC-Q101 for automotive-grade reliability under PPAP-controlled manufacturing.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum collector-emitter voltage before breakdown under open-base conditions; defines maximum supply rail compatibility in switching circuits.
I_C (continuous)	4.0 A - Continuous DC collector current capability at T_C = 25°C; determines usable load drive capacity without forced cooling.
P_D @ T_C = 25°C	20 W - Total power dissipation limit when case temperature is maintained at 25°C; sets heatsink sizing baseline for thermal design.
h_FE @ I_C = 2 A	30–150 - DC current gain range at 2 A collector current; enables predictable base drive sizing for saturation in switching applications.
V_CE(sat) @ I_C/I_B = 10	≤ 0.5 V - Low saturation voltage ensures <1 W conduction loss at 2 A, critical for efficiency in linear regulators and relay drivers.
f_T	3 MHz - Current-gain-bandwidth product; supports stable operation up to audio-frequency amplification and PWM switching below 100 kHz.
R_JC	6.25 °C/W - Junction-to-case thermal resistance; allows direct calculation of junction temperature rise above heatsink temperature.

Pinout & Package

DPAK-3 (Case 369C, 6.10 × 6.54 × 2.28 mm) surface-mount package with exposed collector tab for thermal conduction and mechanical anchoring. Dual collector terminals improve current sharing and reduce effective lead inductance.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control input terminal; requires ~0.2 A base current to saturate at 2 A collector load, enabling direct microcontroller GPIO drive with series resistor.
2	Collector	Main high-current output path; electrically tied to pin 4 and the exposed metal tab for low-inductance, high-current routing and thermal transfer to PCB copper.
3	Emitter	Reference node for biasing and current sensing; connected to ground or low-side shunt in common-emitter configurations.
4	Collector	Second collector terminal, internally bonded to pin 2 and thermal pad; used for redundant connection or split routing to minimize trace inductance in high-di/dt applications.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive underhood applications including engine control modules and body electronics, with PPAP documentation support.
Dual collector terminals	Reduces effective package inductance and improves thermal spreading across PCB copper pour, enhancing reliability in repetitive switching.
UL 94 V-0 epoxy	Self-extinguishing encapsulation material meets flame-retardant safety requirements for industrial and transportation equipment.
Low V_CE(sat)	Minimizes conduction losses in linear regulators and high-current switch-mode drivers, reducing thermal stress on adjacent components.
−55°C to +150°C operating range	Enables deployment in extreme environments such as industrial motor drives, solar inverters, and automotive HVAC systems without derating.

Applications

DC Motor Driver Stage	Linear Voltage Regulator Pass Element
Use Scenario: Driving brushed DC motors up to 36 V and 3 A in industrial actuators and automated valves. IC Role / Device Role / Timing Role: NPN power switch configured in common-emitter topology, controlled by PWM signal from MCU or dedicated gate driver. Use Value: Low V_CE(sat) ≤ 0.5 V reduces heat generation during 100% duty-cycle stall conditions, while h_FE ≥ 30 ensures robust base drive margin at full load.	Use Scenario: High-current pass transistor in adjustable linear regulators powering FPGA core rails or analog sensor subsystems. IC Role / Device Role / Timing Role: Series-pass element regulating output voltage via feedback-controlled base bias, dissipating excess input-output differential power. Use Value: 20 W power rating and R_JC = 6.25°C/W enable stable 3 A output at 5 V dropout without active cooling, supporting noise-sensitive analog circuitry.
Automotive Lamp Control Module	Industrial Relay Driver Circuit
Use Scenario: Switching halogen or LED headlamp loads in AEC-Q101-compliant lighting control units. IC Role / Device Role / Timing Role: Low-speed switching transistor driving lamp loads through flyback diode protection, with integrated ESD robustness (HBM Class 3B). Use Value: AEC-Q101 qualification and −55°C to +150°C operation ensure compliance with automotive ambient and surge requirements, including load dump transients.	Use Scenario: Driving 24 VDC industrial relays with coil currents up to 4 A in PLC I/O modules and factory automation controllers. IC Role / Device Role / Timing Role: Saturated switch providing galvanic isolation between logic-level control and inductive relay coil, with built-in V_EB = 5 V reverse rating. Use Value: High I_C = 4 A rating and dual collector terminals handle relay coil inrush currents reliably, while low saturation voltage minimizes self-heating during extended ON states.

DC Motor Driver Stage

Linear Voltage Regulator Pass Element

Use Scenario: Driving brushed DC motors up to 36 V and 3 A in industrial actuators and automated valves.

IC Role / Device Role / Timing Role: NPN power switch configured in common-emitter topology, controlled by PWM signal from MCU or dedicated gate driver.

Use Value: Low V_CE(sat) ≤ 0.5 V reduces heat generation during 100% duty-cycle stall conditions, while h_FE ≥ 30 ensures robust base drive margin at full load.

Use Scenario: High-current pass transistor in adjustable linear regulators powering FPGA core rails or analog sensor subsystems.

IC Role / Device Role / Timing Role: Series-pass element regulating output voltage via feedback-controlled base bias, dissipating excess input-output differential power.

Use Value: 20 W power rating and R_JC = 6.25°C/W enable stable 3 A output at 5 V dropout without active cooling, supporting noise-sensitive analog circuitry.

Automotive Lamp Control Module

Industrial Relay Driver Circuit

Use Scenario: Switching halogen or LED headlamp loads in AEC-Q101-compliant lighting control units.

IC Role / Device Role / Timing Role: Low-speed switching transistor driving lamp loads through flyback diode protection, with integrated ESD robustness (HBM Class 3B).

Use Value: AEC-Q101 qualification and −55°C to +150°C operation ensure compliance with automotive ambient and surge requirements, including load dump transients.

Use Scenario: Driving 24 VDC industrial relays with coil currents up to 4 A in PLC I/O modules and factory automation controllers.

IC Role / Device Role / Timing Role: Saturated switch providing galvanic isolation between logic-level control and inductive relay coil, with built-in V_EB = 5 V reverse rating.

Use Value: High I_C = 4 A rating and dual collector terminals handle relay coil inrush currents reliably, while low saturation voltage minimizes self-heating during extended ON states.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD127T4G	NPN complement with lower V_CEO = 30 V and higher h_FE = 60–250 at I_C = 2 A; same DPAK-3 package and pinout.	Optimized for lower-voltage, higher-gain amplifier stages where 45 V headroom is unnecessary.	Select MJD127T4G only when supply voltage remains ≤30 V and higher current gain is prioritized over breakdown margin.
BD139-16	TO-126 through-hole package; V_CEO = 80 V, I_C = 1.5 A, h_FE = 40–250; no AEC-Q101 qualification or Pb-free marking.	Suitable for prototyping or legacy through-hole designs but lacks automotive qualification and surface-mount thermal performance.	Choose BD139-16 only for non-automotive, non-production applications where manual assembly or higher voltage margin outweighs thermal and qualification requirements.

Compared with MJD148T4G, MJD127T4G offers better gain at lower voltage, while BD139-16 provides higher voltage rating in a less thermally efficient package - neither is pin-compatible nor drop-in; layout and qualification revalidation required for either alternative.

Availability

MJD148T4G is available at Aetrix Electronics and suitable for industrial motor control, automotive lighting modules, and linear regulator designs requiring stable component supply, AEC-Q101 compliance, and surface-mount thermal performance.

Supply support for MJD148T4G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The MJD148T4G belongs to onsemi's general-purpose bipolar power transistor family, engineered for cost-effective, thermally robust switching and amplification in space-constrained surface-mount applications demanding automotive-grade reliability.

FAQ

What is the maximum continuous collector current rating for MJD148T4G?

The MJD148T4G is rated for 4.0 A continuous collector current at case temperature T_C = 25°C. Derating applies above 25°C at 0.16 W/°C, and actual usable current depends on PCB copper area, heatsinking, and ambient conditions. At T_C = 100°C, the practical continuous current drops to approximately 2.8 A based on thermal limits.

Is MJD148T4G qualified for automotive applications?

Yes, MJD148T4G is AEC-Q101 qualified and PPAP capable, with NJV prefix variants (e.g., NJVMJD148T4G) designated for automotive use. It meets stringent reliability, temperature cycling, and ESD (HBM Class 3B) requirements for under-hood and body electronics applications.

What does the "G" suffix in MJD148T4G indicate?

The "G" suffix in MJD148T4G denotes a Pb-free, RoHS-compliant package per onsemi's standard marking convention. It confirms compliance with EU RoHS Directive 2011/65/EU and indicates the device uses lead-free solderable terminations and UL 94 V-0 epoxy encapsulation.

Can MJD148T4G be used in linear regulator applications?

Yes, MJD148T4G is suitable as a pass transistor in linear regulators due to its 20 W power dissipation rating at T_C = 25°C, low V_CE(sat) ≤ 0.5 V, and stable h_FE across load current. Thermal design must ensure junction temperature stays within −55°C to +150°C using appropriate PCB copper and optional heatsinking.

What is the pin configuration of MJD148T4G in the DPAK package?

MJD148T4G uses DPAK-3 (Case 369C) with four terminals: Pin 1 = Base, Pin 2 = Collector, Pin 3 = Emitter, Pin 4 = Collector (internally connected to pin 2 and the exposed thermal pad). This dual-collector layout enhances current handling and thermal conduction in surface-mount layouts.

MJD148T4G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

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):: 4 A

Voltage - Collector Emitter Breakdown (Max):: 45 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 200mA, 2A

Current - Collector Cutoff (Max):: 20µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 85 @ 500mA, 1V

Power - Max:: 1.75 W

Frequency - Transition:: 3MHz

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

MJD148T4G FAQ

1.How can I place an order for MJD148T4G through Aetrix?

Please submit a Request for Quotation (RFQ) for MJD148T4G 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 MJD148T4G reliable?

The price and inventory of MJD148T4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJD148T4G is usually 5 days.

3.What payment methods are accepted for MJD148T4G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJD148T4G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJD148T4G?

MJD148T4G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJD148T4G 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 MJD148T4G?

For technical support, including MJD148T4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJD148T4G requirements.

6.How does Aetrix verify that MJD148T4G is sourced from the original manufacturer or authorized distributors?

All MJD148T4G 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 MJD148T4G meets industry standards.

7.What is the process for return or replacement of MJD148T4G?

All MJD148T4G units undergo pre-shipment inspection (PSI). If there is an issue with MJD148T4G, 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 MJD148T4G part is unused and in its original packaging.

Return procedure for MJD148T4G:

1.Submit a request within 90 days.

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

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