TIP42CTU-T Equivalent & Substitute Parts

Part Overview

The TIP42CTU-T is a Bipolar (BJT) Transistor with PNP polarity manufactured by onsemi. This component is rated for 100 V collector-emitter breakdown voltage and 6 A maximum collector current in a Through Hole TO-220-3 package. The part is classified as Obsolete, making identification of equivalent and substitute components necessary for ongoing design support and procurement continuity. Substitute parts must maintain electrical and mechanical compatibility across all critical performance parameters.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	6	A
Voltage - Collector Emitter Breakdown (Max)	100	V
Vce Saturation (Max) @ Ib, Ic	1.5V @ 600mA, 6A	V
Current - Collector Cutoff (Max)	700	µA
DC Current Gain (hFE) (Min) @ Ic, Vce	15 @ 3A, 4V	—
Power - Max	2	W
Frequency - Transition	3	MHz
Operating Temperature (TJ)	150	°C
Package / Case	TO-220-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the TIP42CTU-T is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

Transistor Type: PNP
Maximum Collector Current (Ic): 6 A
Maximum Collector-Emitter Breakdown Voltage: 100 V
Vce Saturation: 1.5 V @ 600 mA, 6 A
Maximum Collector Cutoff Current: 700 µA
Minimum DC Current Gain (hFE): 15 @ 3 A, 4 V
Maximum Power Dissipation: 2 W
Transition Frequency: 3 MHz
Maximum Operating Temperature: 150 °C

Mechanical Parameters (Must Match):

Package Type: TO-220-3
Mounting Type: Through Hole

The TIP42CTU-T manufactured by Fairchild Semiconductor meets all specified electrical and mechanical parameters and qualifies as a parametric equivalent substitute.

Parameter Comparison

Parameter	onsemi TIP42CTU-T (Main Part)	Fairchild Semiconductor TIP42CTU-T (Substitute)
Transistor Type	PNP	PNP
Current - Collector (Ic) (Max)	6 A	6 A
Voltage - Collector Emitter Breakdown (Max)	100 V	100 V
Vce Saturation (Max) @ Ib, Ic	1.5 V @ 600 mA, 6 A	1.5 V @ 600 mA, 6 A
Current - Collector Cutoff (Max)	700 µA	700 µA
DC Current Gain (hFE) (Min) @ Ic, Vce	15 @ 3 A, 4 V	15 @ 3 A, 4 V
Power - Max	2 W	2 W
Frequency - Transition	3 MHz	3 MHz
Operating Temperature (TJ)	150 °C	150 °C
Package / Case	TO-220-3	TO-220-3
Mounting Type	Through Hole	Through Hole
Product Status	Obsolete	Active

Engineering Selection Recommendations

The Fairchild Semiconductor TIP42CTU-T is a direct parametric equivalent to the onsemi TIP42CTU-T. Both components share identical electrical specifications and mechanical packaging. The primary distinction is product status: the onsemi version is classified as Obsolete, while the Fairchild Semiconductor version maintains Active status.

The Fairchild Semiconductor substitute carries RoHS3 Compliance certification, providing additional regulatory alignment for applications subject to Restriction of Hazardous Substances requirements. The onsemi original part is REACH Unaffected, while the Fairchild Semiconductor substitute is REACH Affected.

Selection between these components should be based on procurement availability, supply chain requirements, and regulatory compliance mandates specific to the application and end-use market.

Frequently Asked Questions (FAQ)

Q: Can the Fairchild Semiconductor TIP42CTU-T replace the onsemi TIP42CTU-T in existing designs?

A: Yes. Both components are parametrically equivalent across all electrical and mechanical specifications. Direct substitution is supported without circuit modification.

Q: Are there differences in thermal performance between these parts?

A: No. Both components share identical maximum power dissipation (2 W) and maximum operating junction temperature (150 °C).

Q: What is the significance of the TO-220-3 package designation?

A: TO-220-3 specifies a Through Hole package with three leads (Base, Collector, Emitter for PNP configuration). Both substitute parts use this identical package, ensuring mechanical and thermal interface compatibility.

Q: Does the Active status of the Fairchild Semiconductor part affect compatibility?

A: No. Active status indicates current manufacturing and availability. Electrical and mechanical compatibility remains unchanged.

Q: Are there compliance differences between the two parts?

A: The Fairchild Semiconductor version carries RoHS3 Compliance certification. Applications requiring RoHS compliance should specify the Fairchild Semiconductor substitute. The onsemi original is REACH Unaffected; the Fairchild Semiconductor substitute is REACH Affected.

Q: What collector current and voltage ratings apply to both parts?

A: Both parts are rated for maximum collector current of 6 A and maximum collector-emitter breakdown voltage of 100 V, with identical saturation characteristics at 1.5 V @ 600 mA, 6 A.

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