MJD42CT4 Equivalent & Substitute Parts

Part Overview

The MJD42CT4 is an obsolete PNP bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 6 A maximum collector current. Designed for surface mount applications in the DPAK package, this component was utilized in power switching and amplification circuits requiring moderate power dissipation up to 20 W.

Due to its obsolete product status, direct procurement of the MJD42CT4 presents supply chain challenges. Equivalent and substitute parts are available from current production lines, offering improved compliance certifications and enhanced electrical characteristics while maintaining functional compatibility within specified parameter ranges.

Substiute Parts

MJD42CT4

onsemiIn Stock: 2409MJD42CT4 Datasheet

Current PartRFQ

MJD42CT4G

onsemiIn Stock: 16877MJD42CT4G Datasheet

DirectRFQ

PHPT61006PYX

Nexperia USA Inc.In Stock: 15641PHPT61006PYX Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MJD42CT4 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Transistor Type: PNP
• Current - Collector (Ic) Max: 6 A (minimum)
• Voltage - Collector Emitter Breakdown (Max): 100 V (minimum)
• Mounting Type: Surface Mount
• Operating Temperature Range: Must encompass -65°C to 150°C

Acceptable Variation Parameters:

• Power dissipation rating may be lower than 20 W if circuit design permits
• Vce saturation may be lower (improved performance)
• DC Current Gain (hFE) may exceed minimum specification
• Frequency - Transition may exceed 3 MHz
• Package form factor may differ if footprint compatibility is verified

Direct Equivalent (MJD42CT4G): Identical electrical specifications with improved product status and RoHS3 compliance. Packaging format differs (Cut Tape & Digi-Reel vs. standard tape).

Similar Substitute (PHPT61006PYX): Meets all mandatory parameters with enhanced electrical performance characteristics. Package form factor differs significantly (LFPAK56 vs. DPAK), requiring PCB layout verification. Automotive-grade qualification and AEC-Q100 certification provide additional reliability assurance.

Parameter Comparison

Engineering Selection Recommendations

MJD42CT4G Selection Criteria:

The MJD42CT4G is the direct functional equivalent of the MJD42CT4, offering identical electrical performance specifications across all critical parameters. This substitute is preferred when:

• Existing PCB layouts utilize DPAK package footprints
• RoHS3 compliance is required for new designs or procurement
• Active product status and extended supply availability are necessary
• Power dissipation requirements do not exceed 1.75 W in the application circuit

The MJD42CT4G maintains backward compatibility with the obsolete MJD42CT4 without requiring circuit redesign or PCB modification.

PHPT61006PYX Selection Criteria:

The PHPT61006PYX is a functionally compatible substitute offering enhanced electrical performance characteristics. This substitute is appropriate when:

• PCB layout can accommodate the LFPAK56 package form factor (SC-100, SOT-669)
• Automotive-grade reliability and AEC-Q100 qualification are required
• Lower saturation voltage and leakage current improve circuit efficiency
• Higher transition frequency (116 MHz) supports faster switching applications
• Extended maximum operating temperature (175°C) is beneficial for thermal margin

The PHPT61006PYX requires PCB footprint verification and layout modification prior to implementation.

Frequently Asked Questions (FAQ)

Q: Can MJD42CT4G be used as a direct replacement for MJD42CT4 without PCB modification?

A: Yes. The MJD42CT4G maintains identical electrical specifications and DPAK package compatibility. No circuit redesign or PCB layout changes are required. The substitute is pin-compatible and functionally equivalent.

Q: What are the primary differences between MJD42CT4G and PHPT61006PYX?

A: The MJD42CT4G is a direct equivalent with identical specifications and DPAK packaging. The PHPT61006PYX offers enhanced performance (lower saturation voltage, higher transition frequency, lower leakage current) but requires different PCB footprint (LFPAK56 vs. DPAK). The PHPT61006PYX includes automotive-grade qualification and AEC-Q100 certification.

Q: Is the PHPT61006PYX suitable for applications originally designed for MJD42CT4?

A: The PHPT61006PYX meets all mandatory electrical parameters (6 A collector current, 100 V breakdown voltage, PNP type, surface mount). However, the different package form factor (LFPAK56 vs. DPAK) requires PCB layout verification and modification. Electrical performance is superior, making it suitable for redesigned applications.

Q: What compliance certifications differ between these parts?

A: The MJD42CT4 is RoHS non-compliant. Both MJD42CT4G and PHPT61006PYX are ROHS3 compliant. The PHPT61006PYX additionally carries AEC-Q100 automotive qualification. All three parts are REACH unaffected and classified as EAR99.

Q: Are there inventory or lead time considerations for these substitutes?

A: The MJD42CT4 (obsolete) has 2,362 units in stock. The MJD42CT4G (active) has 16,794 units available. The PHPT61006PYX (active) has 15,547 units available. Active product status for both substitutes ensures improved long-term supply chain availability.

Q: What is the maximum power dissipation difference, and does it affect circuit design?

A: The MJD42CT4 is rated for 20 W maximum power dissipation. Both substitutes are rated lower (MJD42CT4G: 1.75 W; PHPT61006PYX: 1.3 W). Applications requiring power dissipation above 1.75 W must verify thermal management and circuit design compatibility with the substitute part's lower power rating.

Q: Can PHPT61006PYX operate at the full -65°C to 150°C temperature range of MJD42CT4?

A: The PHPT61006PYX operates from -40°C to 175°C. The lower temperature limit (-40°C vs. -65°C) may not support applications requiring operation below -40°C. The upper temperature limit (175°C) exceeds the original specification, providing additional thermal margin.