MJD31CQ-13 Equivalent & Substitute Parts

Part Overview

The MJD31CQ-13 is a surface mount NPN bipolar junction transistor manufactured by Diodes Incorporated, rated for 100 V collector-emitter breakdown voltage and 3 A maximum collector current. The device is packaged in TO-252-3 (DPAK) configuration with a maximum power dissipation of 15 W and transition frequency of 3 MHz.

The MJD31CQ-13 carries a product status of "Not For New Designs," indicating it is no longer recommended for new circuit implementations. Identification of equivalent and substitute parts is necessary to support existing designs, facilitate component sourcing, and enable transition to active alternatives that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	100	V
Current - Collector (Ic) (Max)	3	A
Power - Max	15	W
Vce Saturation (Max) @ Ib, Ic	1.2 V @ 375 mA, 3 A	V
DC Current Gain (hFE) (Min) @ Ic, Vce	10 @ 3 A, 4 V	—
Frequency - Transition	3	MHz
Operating Temperature Range	-55 to 150	°C
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MJD31CQ-13 is determined by strict equivalence of the following electrical and mechanical parameters:

Critical Substitution Parameters:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 100 V
Current - Collector (Ic) (Max): 3 A
Vce Saturation (Max) @ Ib, Ic: 1.2 V @ 375 mA, 3 A
DC Current Gain (hFE) (Min) @ Ic, Vce: 10 @ 3 A, 4 V
Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type: Surface Mount

Secondary Considerations:

Power - Max: 15 W (primary specification) or 1.56 W (reduced specification)
Frequency - Transition: 3 MHz
Operating Temperature Range: -55°C to 150°C (primary) or -65°C to 150°C (extended lower limit)
RoHS Status: ROHS3 Compliant (preferred for new designs)
Product Status: Active (preferred for new designs)

All substitute parts listed maintain the core electrical characteristics (voltage, current, saturation voltage, and current gain) and physical package format. Variations in power dissipation rating, transition frequency specification, and operating temperature lower limit are noted where they occur.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) [A]	Vce Breakdown (Max) [V]	Power (Max) [W]	Frequency [MHz]	Temp Range [°C]	Product Status	RoHS	Package
MJD31CQ-13	Diodes Incorporated	3	100	15	3	-55 to 150	Not For New Designs	ROHS3	TO-252-3
MJD31C-13	Diodes Incorporated	3	100	1.56	3	-55 to 150	Active	ROHS3	TO-252-3
MJD31CRLG	onsemi	3	100	1.56	3	-65 to 150	Active	ROHS3	TO-252-3
MJD31CT4	onsemi	3	100	15	3	-65 to 150	Obsolete	Non-compliant	TO-252-3
MJD31CT4-A	STMicroelectronics	3	100	15	—	—	Active	ROHS3	TO-252-3
MJD31CT4G	onsemi	3	100	1.56	3	-65 to 150	Active	ROHS3	TO-252-3
NJVMJD31CG	onsemi	3	100	1.56	3	-65 to 150	Active	ROHS3	TO-252-3
NJVMJD31CRLG	onsemi	3	100	1.56	3	-65 to 150	Active	ROHS3	TO-252-3

Engineering Selection Recommendations

For Active Design Continuation (Recommended):

MJD31CT4-A (STMicroelectronics) is the primary recommended substitute. This part maintains the 15 W power rating of the original MJD31CQ-13, carries Active product status, and holds ROHS3 compliance. The part is available in Cut Tape & Digi-Reel packaging with 15,408 units in stock.

Alternative Active Substitutes:

MJD31C-13 (Diodes Incorporated) provides direct manufacturer continuity from the original part. It maintains Active status and ROHS3 compliance with the same -55°C to 150°C operating temperature range. The reduced 1.56 W power rating is suitable for applications not requiring the full 15 W dissipation capability.

MJD31CT4G (onsemi) and NJVMJD31CRLG (onsemi) are Active alternatives with extended operating temperature range (-65°C to 150°C) and ROHS3 compliance. Both carry 1.56 W power ratings. MJD31CT4G is available in Cut Tape & Digi-Reel packaging (35,200 units in stock), while NJVMJD31CRLG is available in Tape & Reel packaging (7,800 units in stock).

NJVMJD31CG (onsemi) provides an Active alternative in Tube packaging with identical electrical specifications to MJD31CT4G and NJVMJD31CRLG (5,325 units in stock).

Parts to Avoid:

MJD31CT4 (onsemi) carries Obsolete product status and RoHS non-compliance. This part is unsuitable for new designs despite matching the 15 W power rating.

MJD31CRLG (onsemi) is Active and ROHS3 compliant but carries a reduced 1.56 W power rating. Selection of this part requires confirmation that application power dissipation does not exceed 1.56 W.

Frequently Asked Questions (FAQ)

Q: Can MJD31C-13 directly replace MJD31CQ-13 in existing designs?

A: MJD31C-13 maintains electrical equivalence in all critical parameters: 3 A collector current, 100 V breakdown voltage, 1.2 V saturation voltage, and 10 minimum current gain. Both parts use TO-252-3 DPAK packaging. The primary difference is reduced power rating (1.56 W versus 15 W). Substitution is valid if circuit power dissipation does not exceed 1.56 W.

Q: What is the difference between MJD31CT4-A and MJD31CT4G?

A: MJD31CT4-A (STMicroelectronics) maintains the 15 W power rating and carries Active product status with ROHS3 compliance. MJD31CT4G (onsemi) has a reduced 1.56 W power rating but also carries Active status and ROHS3 compliance with extended operating temperature range (-65°C to 150°C). Selection depends on power dissipation requirements and temperature operating range.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts use TO-252-3 DPAK surface mount packaging. Packaging format variations exist at the distribution level: MJD31C-13 is available in Tape & Reel; MJD31CRLG and MJD31CT4-A are available in Cut Tape & Digi-Reel; MJD31CT4G is available in Cut Tape & Digi-Reel; NJVMJD31CG is available in Tube; NJVMJD31CRLG is available in Tape & Reel. Component-level package remains identical across all parts.

Q: Why do some substitutes have lower power ratings?

A: Power rating differences reflect thermal design variations between manufacturers. MJD31C-13, MJD31CT4G, NJVMJD31CG, and NJVMJD31CRLG are rated at 1.56 W, while MJD31CQ-13 and MJD31CT4-A are rated at 15 W. All parts maintain identical electrical performance at rated current and voltage. Selection of lower-rated parts requires verification that circuit power dissipation remains within the 1.56 W limit.

Q: Is MJD31CT4 suitable as a substitute?

A: MJD31CT4 is not recommended. Although it matches the 15 W power rating and electrical specifications, it carries Obsolete product status and RoHS non-compliance. Active alternatives with equivalent specifications are available.

Q: What is the significance of the extended temperature range (-65°C to 150°C) in some substitutes?

A: MJD31CRLG, MJD31CT4G, NJVMJD31CG, and NJVMJD31CRLG extend the lower operating temperature limit to -65°C compared to the -55°C limit of MJD31CQ-13 and MJD31C-13. This extended range provides additional margin for applications operating in cold environments. The upper temperature limit remains 150°C across all parts.

Q: Can NJVMJD31CG and NJVMJD31CRLG be used interchangeably?

A: NJVMJD31CG and NJVMJD31CRLG are electrically identical with matching specifications. The difference is packaging format: NJVMJD31CG is supplied in Tube packaging, while NJVMJD31CRLG is supplied in Tape & Reel. Selection depends on assembly process requirements and inventory management preferences.

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