MJD148T4 Equivalent & Substitute Parts

Part Overview

The MJD148T4 is an obsolete NPN power bipolar junction transistor manufactured by onsemi, designed for surface mount applications in the DPAK package. This device is rated for 4 A collector current, 45 V collector-emitter breakdown voltage, and 20 W maximum power dissipation. Due to its obsolete product status, equivalent and substitute parts are necessary for ongoing production, maintenance, and design continuity. The MJD148T4 remains available in inventory but is no longer recommended for new designs by the manufacturer.

Key Parameters

Parameter	Value	Unit
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)	20	µA
DC Current Gain (hFE) Min @ Ic, Vce	85 @ 500mA, 1V	—
Power - Max	20	W
Frequency - Transition	3	MHz
Operating Temperature Range	-65 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the MJD148T4 is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Transistor type must be NPN
Collector current rating (Ic Max) must equal or exceed 4 A
Collector-emitter breakdown voltage (Vce Breakdown Max) must equal or exceed 45 V
Vce saturation characteristics must be compatible with 500mV @ 200mA, 2A specification
DC current gain (hFE) must meet or exceed 85 @ 500mA, 1V
Operating temperature range must encompass -65°C to 150°C (TJ)

Mechanical Compatibility Criteria:

Mounting type must be Surface Mount
Package must be TO-252-3, DPAK (2 Leads + Tab), SC-63 or equivalent footprint

Substitute Classification:

Direct Equivalent: MJD148T4G (onsemi) — Identical electrical specifications with active product status and RoHS3 compliance. Packaging is Cut Tape (CT) versus the original bulk packaging.

Similar Substitute: 2SC5103TLQ (Rohm Semiconductor) — Exceeds electrical specifications in collector current (5 A vs. 4 A), collector-emitter breakdown voltage (60 V vs. 45 V), and transition frequency (120MHz vs. 3MHz). Meets all minimum electrical requirements. Product status is Not For New Designs. Package is CPT3 variant of DPAK.

Parameter Comparison

Parameter	MJD148T4 (Main)	MJD148T4G (Direct)	2SC5103TLQ (Similar)
Manufacturer	onsemi	onsemi	Rohm Semiconductor
Transistor Type	NPN	NPN	NPN
Current - Collector (Ic) Max	4 A	4 A	5 A
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	60 V
Vce Saturation (Max) @ Ib, Ic	500mV @ 200mA, 2A	500mV @ 200mA, 2A	500mV @ 200mA, 4A
Current - Collector Cutoff (Max)	20 µA	20 µA	10 µA
DC Current Gain (hFE) Min @ Ic, Vce	85 @ 500mA, 1V	85 @ 500mA, 1V	120 @ 1A, 2V
Power - Max	20 W	1.75 W	1 W
Frequency - Transition	3 MHz	3 MHz	120 MHz
Operating Temperature Range	-65 to 150 °C (TJ)	-65 to 150 °C (TJ)	-65 to 150 °C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
Product Status	Obsolete	Active	Not For New Designs
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Preferred):

The MJD148T4G is the primary substitute for the MJD148T4. This part maintains identical electrical specifications across all critical parameters: 4 A collector current, 45 V breakdown voltage, 500mV saturation voltage, 85 hFE minimum, and 3 MHz transition frequency. The MJD148T4G carries Active product status and RoHS3 compliance, making it suitable for new designs and ongoing production. The only difference is packaging format (Cut Tape versus bulk), which does not affect electrical or mechanical compatibility. Inventory availability is significantly higher (4275 Pcs vs. 850 Pcs).

For Alternative Substitution (When Direct Replacement Unavailable):

The 2SC5103TLQ from Rohm Semiconductor exceeds the electrical specifications of the MJD148T4 in collector current (5 A), breakdown voltage (60 V), and transition frequency (120 MHz). This part is electrically compatible and meets all minimum requirements for the MJD148T4 application. However, the 2SC5103TLQ carries a Not For New Designs status and has lower maximum power dissipation (1 W vs. 20 W). This substitute is appropriate for legacy system maintenance and repair where the higher electrical ratings provide design margin. Inventory availability is substantially higher (47700 Pcs).

Compliance Considerations:

The MJD148T4 is RoHS non-compliant. Both substitute parts (MJD148T4G and 2SC5103TLQ) are RoHS3 compliant. All three parts are REACH Unaffected and carry EAR99 ECCN classification. Moisture sensitivity level is 1 (Unlimited) for all parts.

Frequently Asked Questions (FAQ)

Q: Can MJD148T4G be used as a direct replacement for MJD148T4?

A: Yes. The MJD148T4G is a direct electrical and mechanical equivalent. Both parts share identical specifications for collector current (4 A), breakdown voltage (45 V), saturation voltage (500mV @ 200mA, 2A), DC current gain (85 @ 500mA, 1V), transition frequency (3 MHz), and operating temperature range (-65°C to 150°C). Both use the TO-252-3 DPAK package. The MJD148T4G is the recommended substitute due to its Active product status and RoHS3 compliance.

Q: What is the difference between MJD148T4 and MJD148T4G?

A: The primary differences are product status and packaging format. The MJD148T4 is Obsolete and RoHS non-compliant, while MJD148T4G is Active and RoHS3 compliant. The MJD148T4G is supplied in Cut Tape (CT) packaging versus the original bulk format. Electrical specifications are identical. The MJD148T4G is preferred for new designs and ongoing production.

Q: Can 2SC5103TLQ replace MJD148T4?

A: Yes, with design margin considerations. The 2SC5103TLQ exceeds the electrical specifications of the MJD148T4 in collector current (5 A vs. 4 A), breakdown voltage (60 V vs. 45 V), and transition frequency (120 MHz vs. 3 MHz). All minimum electrical requirements are met. However, the 2SC5103TLQ has lower maximum power dissipation (1 W vs. 20 W) and carries a Not For New Designs status. This substitute is suitable for legacy system maintenance where higher electrical ratings provide design margin.

Q: Are there package compatibility issues between these substitutes?

A: All three parts use the TO-252-3 DPAK package with identical pinout (2 Leads + Tab, SC-63). The MJD148T4G uses DPAK supplier device package, while 2SC5103TLQ uses CPT3 variant. Both are mechanically and electrically compatible with the original MJD148T4 footprint. No PCB layout modifications are required.

Q: What is the inventory status of these parts?

A: MJD148T4 has 850 Pcs in stock (Obsolete status). MJD148T4G has 4275 Pcs in stock (Active status). 2SC5103TLQ has 47700 Pcs in stock (Not For New Designs status). For long-term supply security, MJD148T4G is the recommended choice.

Q: Are these parts RoHS compliant?

A: The MJD148T4 is RoHS non-compliant. Both MJD148T4G and 2SC5103TLQ are RoHS3 compliant. If RoHS compliance is required for your application, use MJD148T4G or 2SC5103TLQ.

Q: What is the maximum power dissipation difference between MJD148T4 and its substitutes?

A: The MJD148T4 is rated for 20 W maximum power dissipation. The MJD148T4G is rated for 1.75 W, and the 2SC5103TLQ is rated for 1 W. If your application requires the full 20 W dissipation capability, verify that the substitute part's thermal characteristics and package design support your thermal management requirements.

Q: Can these parts be used interchangeably in existing designs?

A: MJD148T4 and MJD148T4G are fully interchangeable from electrical and mechanical perspectives. The 2SC5103TLQ is electrically compatible but has different power dissipation ratings. Verify that your thermal design and power budget accommodate the lower maximum power rating of the 2SC5103TLQ before substitution.

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