MJD42C Equivalent & Substitute Parts

Part Overview

The MJD42C is a PNP bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 6 A maximum collector current. The device is packaged in a Surface Mount DPAK (TO-252-3) configuration and is designed for general-purpose switching and amplification applications requiring 1.75 W power dissipation capability.

The MJD42C is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this component.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	6	A
Voltage - Collector Emitter Breakdown (Max)	100	V
Power - Max	1.75	W
Mounting Type	Surface Mount	—
Operating Temperature Range	-65 to 150	°C (TJ)
Frequency - Transition	3	MHz

Substitute Part Grouping Explanation

Substitute parts for the MJD42C are identified based on strict electrical and mechanical parameter matching within the bipolar junction transistor category. The substitution logic is organized into two groups:

Direct Substitutes (Identical Electrical Specifications): Parts that maintain all critical electrical parameters including collector current rating (6 A), collector-emitter breakdown voltage (100 V), power dissipation (1.75 W), transition frequency (3 MHz), and DC current gain characteristics. These parts share the same base product number (MJD42) and package type (DPAK Surface Mount).

Similar Substitutes (Equivalent Electrical Performance with Package Variation): Parts that satisfy the core electrical requirements (PNP type, 6 A collector current, 100 V breakdown voltage) but differ in package configuration, transition frequency, power rating, or thermal characteristics. These parts are suitable for applications where the electrical performance envelope is met, despite physical or performance differences.

The key parameters determining substitution eligibility are:

Transistor polarity (PNP)
Maximum collector current (6 A minimum)
Collector-emitter breakdown voltage (100 V minimum)
Surface mount configuration
Operating temperature range compatibility

Parameter Comparison

Parameter	MJD42C	MJD42CG	PHPT61006PYX
Manufacturer	onsemi	onsemi	Nexperia USA Inc.
Product Status	Obsolete	Active	Active
Transistor Type	PNP	PNP	PNP
Current - Collector (Ic) (Max)	6 A	6 A	6 A
Voltage - Collector Emitter Breakdown (Max)	100 V	100 V	100 V
Vce Saturation (Max)	1.5 V @ 600mA, 6A	1.5 V @ 600mA, 6A	130 mV @ 50mA, 1A
DC Current Gain (hFE) (Min)	15 @ 3A, 4V	15 @ 3A, 4V	170 @ 500mA, 2V
Power - Max	1.75 W	1.75 W	1.3 W
Frequency - Transition	3 MHz	3 MHz	116 MHz
Operating Temperature (TJ)	-65 to 150 °C	-65 to 150 °C	175 °C (Max)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	SC-100, SOT-669
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	—	Tube	Tape & Reel (TR)
AEC-Q100 Qualification	—	—	Yes

Engineering Selection Recommendations

MJD42CG (Direct Substitute): This part is the recommended primary substitute for the obsolete MJD42C. It maintains identical electrical specifications across all critical parameters including collector current (6 A), breakdown voltage (100 V), power dissipation (1.75 W), and transition frequency (3 MHz). The MJD42CG shares the same DPAK package configuration and base product number (MJD42), ensuring mechanical and electrical compatibility without circuit redesign. The part is currently in active production status with ROHS3 compliance, addressing regulatory requirements that the original MJD42C does not meet. Inventory availability is confirmed at 34,088 pieces.

PHPT61006PYX (Similar Substitute): This part from Nexperia USA Inc. satisfies the core electrical requirements of PNP polarity, 6 A collector current, and 100 V breakdown voltage. The PHPT61006PYX is suitable for applications where the electrical performance envelope is met, despite differences in package configuration (LFPAK56 Power-SO8 versus DPAK), transition frequency (116 MHz versus 3 MHz), and power rating (1.3 W versus 1.75 W). This part carries AEC-Q100 automotive qualification and ROHS3 compliance. Selection of this part requires verification that the alternative package footprint is compatible with the target printed circuit board layout and that the higher transition frequency does not introduce unintended circuit behavior. The maximum operating temperature of 175 °C exceeds the MJD42C specification of 150 °C.

Frequently Asked Questions (FAQ)

Q: Can MJD42CG be used as a direct replacement for MJD42C without circuit modification?

A: Yes. The MJD42CG maintains identical electrical specifications for collector current (6 A), collector-emitter breakdown voltage (100 V), power dissipation (1.75 W), transition frequency (3 MHz), and DC current gain characteristics. Both parts use the DPAK Surface Mount package. No circuit redesign is required.

Q: What is the primary difference between MJD42C and MJD42CG?

A: The MJD42C is classified as obsolete product status, while MJD42CG is in active production. MJD42CG is ROHS3 compliant, whereas MJD42C is non-compliant. Electrical performance is identical. Packaging differs in form factor: MJD42C is supplied without specified packaging, while MJD42CG is supplied in Tube packaging.

Q: Is PHPT61006PYX a suitable replacement for MJD42C?

A: PHPT61006PYX satisfies the core electrical requirements of PNP polarity, 6 A collector current, and 100 V breakdown voltage. However, it differs in package configuration (LFPAK56 Power-SO8 versus DPAK), transition frequency (116 MHz versus 3 MHz), and power rating (1.3 W versus 1.75 W). Selection requires confirmation that the alternative package is compatible with the target circuit board layout and that the higher transition frequency does not introduce circuit performance issues.

Q: What are the key electrical parameters that determine substitution eligibility?

A: Substitution eligibility is determined by PNP transistor polarity, maximum collector current of 6 A or greater, collector-emitter breakdown voltage of 100 V or greater, and Surface Mount configuration. Additional considerations include operating temperature range, power dissipation capability, and transition frequency relative to circuit requirements.

Q: Does PHPT61006PYX require different circuit board layout compared to MJD42C?

A: Yes. PHPT61006PYX uses the LFPAK56 Power-SO8 package (SC-100, SOT-669), while MJD42C uses the DPAK package (TO-252-3). The footprints are not interchangeable. Circuit board redesign is required to accommodate the alternative package configuration.

Q: Are there compliance or certification differences between the substitute parts?

A: MJD42C is RoHS non-compliant. Both MJD42CG and PHPT61006PYX are ROHS3 compliant. PHPT61006PYX carries AEC-Q100 automotive qualification, which is not specified for MJD42C or MJD42CG. All three parts are REACH Unaffected and classified under ECCN EAR99.

Q: What is the inventory status of substitute parts?

A: MJD42CG has 34,088 pieces in stock. PHPT61006PYX has 15,547 pieces in stock. The original MJD42C has 305,200 pieces in stock, but is classified as obsolete product status.

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