KSH42CTM Equivalent & Substitute Parts

Part Overview

The KSH42CTM is a PNP bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 6 A maximum collector current in a surface mount DPAK package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The KSH42CTM delivers 20 W maximum power dissipation with a 3 MHz transition frequency, suitable for general-purpose switching and amplification circuits requiring moderate power handling in compact form factors.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	6	A
Collector-Emitter Breakdown Voltage (Max)	100	V
Vce Saturation (Max)	1.5	V @ 600mA, 6A
Collector Cutoff Current (Max)	10	µA
DC Current Gain (hFE Min)	15	@ 3A, 4V
Power Dissipation (Max)	20	W
Transition Frequency	3	MHz
Operating Temperature (Max)	150	°C (TJ)
Package Type	TO-252-3, DPAK	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the KSH42CTM is determined by matching the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor polarity: PNP
Collector current rating: 6 A minimum
Collector-emitter breakdown voltage: 100 V minimum
Vce saturation characteristics: 1.5 V @ 600mA, 6A
Package type: TO-252-3 DPAK surface mount
DC current gain (hFE): 15 minimum @ 3A, 4V

Direct Substitutes are parts that meet or exceed all primary criteria while maintaining identical electrical performance within the specified operating envelope. These parts are functionally interchangeable with the KSH42CTM in applications designed for its electrical specifications.

Similar Parts are devices that share the same package and voltage rating but differ in current capacity, power dissipation, or other secondary parameters. These parts are listed for reference when design requirements permit relaxation of specific electrical constraints.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) A	Vce Breakdown V	Vce Sat V	Power W	hFE Min	Package	Temp Range °C
KSH42CTM	onsemi	Obsolete	6	100	1.5 @ 600mA, 6A	20	15 @ 3A, 4V	DPAK	–40 to 150
MJD42CG	onsemi	Active	6	100	1.5 @ 600mA, 6A	1.75	15 @ 3A, 4V	DPAK	–65 to 150
MJD42CT4G	onsemi	Active	6	100	1.5 @ 600mA, 6A	1.75	15 @ 3A, 4V	DPAK	–65 to 150
NJVMJD42CRLG	onsemi	Active	6	100	1.5 @ 600mA, 6A	1.75	15 @ 3A, 4V	DPAK	–65 to 150
MJD32CG	onsemi	Active	3	100	1.2 @ 375mA, 3A	1.56	10 @ 3A, 4V	DPAK	–65 to 150
MJD32CRLG	onsemi	Active	3	100	1.2 @ 375mA, 3A	1.56	10 @ 3A, 4V	DPAK	–65 to 150
MJD32CT4G	onsemi	Active	3	100	1.2 @ 375mA, 3A	1.56	10 @ 3A, 4V	DPAK	–65 to 150
MJD127-TP	Micro Commercial Co	Active	8	100	4 @ 80mA, 8A	1.5	1000 @ 4A, 4V	DPAK	–40 to 150
PHPT61006PYX	Nexperia USA Inc.	Active	6	100	0.13 @ 50mA, 1A	1.3	170 @ 500mA, 2V	LFPAK56	–40 to 175
2SD1815T-TL-E	onsemi	Obsolete	3	100	0.4 @ 150mA, 1.5A	1	70 @ 500mA, 5V	TP-FA	–40 to 150

Engineering Selection Recommendations

Direct Substitutes for KSH42CTM:

The following parts are direct functional equivalents and may be selected as replacements:

MJD42CG (onsemi, Active): Identical electrical specifications with extended operating temperature range (–65°C to 150°C). Available in tube packaging. RoHS3 compliant.
MJD42CT4G (onsemi, Active): Identical electrical specifications with extended operating temperature range (–65°C to 150°C). Available in cut tape and Digi-Reel packaging. RoHS3 compliant.
NJVMJD42CRLG (onsemi, Active): Identical electrical specifications with extended operating temperature range (–65°C to 150°C). Available in tape and reel packaging. RoHS3 compliant.

All three direct substitutes maintain the 6 A collector current, 100 V breakdown voltage, and DPAK package configuration. The primary difference is reduced maximum power dissipation (1.75 W versus 20 W for the KSH42CTM), which is acceptable for applications not requiring the full 20 W thermal budget. All direct substitutes carry active product status and RoHS3 compliance.

Similar Parts for Reduced Current Applications:

The MJD32 series (MJD32CG, MJD32CRLG, MJD32CT4G) provides 3 A maximum collector current with identical 100 V breakdown voltage and DPAK packaging. These parts are suitable only for applications where collector current does not exceed 3 A.

Higher Current Alternative:

The MJD127-TP (Micro Commercial Co, Active) provides 8 A collector current with 100 V breakdown voltage in DPAK packaging. This part is suitable for applications requiring higher current capacity than the KSH42CTM.

Alternative Package Technology:

The PHPT61006PYX (Nexperia USA Inc., Active) provides 6 A collector current and 100 V breakdown voltage in an LFPAK56 (Power-SO8) package with automotive-grade qualification (AEC-Q100). This part requires PCB layout modification due to different package geometry but offers superior thermal performance and higher operating temperature (175°C maximum).

Frequently Asked Questions (FAQ)

Q: Can MJD42CG, MJD42CT4G, and NJVMJD42CRLG be used interchangeably with KSH42CTM?

A: Yes. These three parts are direct electrical equivalents with identical collector current (6 A), breakdown voltage (100 V), saturation voltage (1.5 V @ 600mA, 6A), and DC current gain specifications. The primary difference is packaging format (tube, cut tape, or tape and reel) and extended operating temperature range (–65°C to 150°C versus the KSH42CTM's standard range). All three are RoHS3 compliant and carry active product status.

Q: Why is the maximum power dissipation lower in the MJD42 series compared to KSH42CTM?

A: The MJD42 series specifies 1.75 W maximum power dissipation while the KSH42CTM specifies 20 W. This difference reflects thermal design and package thermal resistance characteristics. For applications requiring the full 20 W thermal budget, the KSH42CTM specifications must be verified against actual circuit power dissipation. In most switching applications, the reduced power rating of the MJD42 series is not a limiting factor.

Q: Can MJD32 series parts replace KSH42CTM?

A: No. The MJD32 series is rated for 3 A maximum collector current, while the KSH42CTM is rated for 6 A. MJD32 parts are suitable only for applications where collector current does not exceed 3 A. Using MJD32 in a circuit designed for 6 A operation will result in device failure.

Q: Is the PHPT61006PYX a suitable replacement?

A: The PHPT61006PYX provides equivalent 6 A collector current and 100 V breakdown voltage specifications. However, it uses a different package (LFPAK56 Power-SO8) requiring PCB layout modification. This part is suitable only if the application can accommodate the different package footprint and thermal interface requirements. The PHPT61006PYX offers automotive-grade qualification and superior thermal performance.

Q: What is the difference between tube, cut tape, and tape and reel packaging?

A: Tube packaging is used for manual handling and small-quantity applications. Cut tape and Digi-Reel packaging is used for semi-automated assembly. Tape and reel packaging is used for fully automated pick-and-place assembly. The electrical specifications of the device are identical regardless of packaging format. Selection depends on manufacturing process requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All direct substitutes (MJD42CG, MJD42CT4G, NJVMJD42CRLG) and similar parts listed are RoHS3 compliant. The PHPT61006PYX is also RoHS3 compliant with additional automotive-grade qualification.

Q: Can KSH42CTM be used in place of MJD42 series parts?

A: The KSH42CTM is obsolete and no longer in production. While the electrical specifications are compatible, sourcing new KSH42CTM devices is not practical. Active production parts (MJD42CG, MJD42CT4G, NJVMJD42CRLG) should be used for new designs and ongoing production.

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