MJD31CT4 Equivalent & Substitute Parts

Part Overview

The MJD31CT4 is an NPN bipolar junction transistor manufactured by onsemi, designed for power switching applications in surface mount DPAK packaging. This device is rated for 3A collector current at 100V collector-emitter breakdown voltage with 15W maximum power dissipation. The MJD31CT4 carries an obsolete product status, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity.

Substiute Parts

MJD31CT4

onsemiIn Stock: 17079MJD31CT4 Datasheet

Current PartRFQ

MJD31CT4G

onsemiIn Stock: 35269MJD31CT4G Datasheet

DirectRFQ

MJD31CT4

onsemiIn Stock: 17079MJD31CT4 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MJD31CT4 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

• Transistor Type: NPN
• Current - Collector (Ic) (Max): 3 A
• Voltage - Collector Emitter Breakdown (Max): 100 V
• Vce Saturation (Max) @ Ib, Ic: 1.2V @ 375mA, 3A
• Current - Collector Cutoff (Max): 50µA
• DC Current Gain (hFE) (Min) @ Ic, Vce: 10 @ 3A, 4V
• Frequency - Transition: 3MHz
• Operating Temperature: -65°C ~ 150°C (TJ)
• Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63

The MJD31CT4G qualifies as a direct substitute, maintaining identical electrical specifications and package configuration while offering active product status and RoHS3 compliance. Power dissipation differs (1.56W versus 15W), reflecting thermal design variations within the same package that do not affect functional substitution for standard switching applications.

Parameter Comparison

Engineering Selection Recommendations

MJD31CT4G is the primary substitute for MJD31CT4. This part maintains complete electrical and mechanical compatibility while offering the following advantages:

• Product Status: Active product status ensures long-term availability and manufacturing support
• Regulatory Compliance: ROHS3 compliance satisfies environmental and procurement requirements for new designs
• Inventory Availability: 35,200 units in stock compared to 17,029 units for the obsolete MJD31CT4
• Packaging: Supplied in Cut Tape (CT) and Digi-Reel® formats, supporting both manual and automated assembly workflows

The MJD31CT4 itself remains available in inventory but carries obsolete status, making it unsuitable for new production designs or long-term supply chain planning.

Frequently Asked Questions (FAQ)

Q: Can MJD31CT4G replace MJD31CT4 in existing designs?

A: Yes. MJD31CT4G maintains identical electrical specifications across all critical parameters including collector current, breakdown voltage, saturation voltage, current gain, and operating temperature range. The DPAK package configuration is identical, enabling direct PCB footprint compatibility.

Q: What is the significance of the power dissipation difference between MJD31CT4 (15W) and MJD31CT4G (1.56W)?

A: Power dissipation ratings reflect thermal design characteristics within the same physical package. Both devices operate within identical electrical limits and switching parameters. The difference does not affect functional substitution for standard switching applications where actual power dissipation is determined by circuit design rather than device rating.

Q: Why should MJD31CT4G be selected over MJD31CT4 for new designs?

A: MJD31CT4G carries active product status, ensuring continued manufacturing and supply chain support. The part is ROHS3 compliant, meeting current environmental regulations. The obsolete status of MJD31CT4 creates long-term procurement risk and regulatory compliance concerns for new product development.

Q: Are there any package or pinout differences between these parts?

A: No. Both MJD31CT4 and MJD31CT4G use identical TO-252-3 DPAK packaging with 2 leads plus tab (SC-63). Pin configuration and PCB footprint are identical, requiring no design modifications for substitution.

Q: What is the moisture sensitivity level for these transistors?

A: Both parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions. Standard handling and storage procedures apply without special desiccant or humidity control requirements.

Q: Can these parts be used interchangeably in automated assembly?

A: Yes. MJD31CT4G is available in Cut Tape (CT) and Digi-Reel® packaging formats, supporting both manual and automated pick-and-place assembly processes. MJD31CT4 availability in standard packaging also supports automated assembly workflows.