TIP35A Equivalent & Substitute Parts Reference

Part Overview

The TIP35A is an NPN bipolar junction transistor manufactured by Central Semiconductor Corp, designed for high-current switching and amplification applications. This device operates at 60 V collector-emitter breakdown voltage with a maximum collector current of 25 A and dissipates up to 125 W. The TIP35A is classified as obsolete, making identification of functionally equivalent active alternatives necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	25	A
Power - Max	125	W
Frequency - Transition	3	MHz
Operating Temperature Range	-65 to 150	°C (TJ)
Mounting Type	Through Hole	—
DC Current Gain (hFE) (Min)	10 @ 15A, 4V	—

Substitute Part Grouping Explanation

Substitution of the TIP35A is determined by electrical and mechanical parameter equivalence within the NPN bipolar transistor category. The critical parameters governing substitution are:

Electrical Parameters:

Collector-emitter breakdown voltage: 60 V (maximum rating)
Maximum collector current: 25 A
Maximum power dissipation: 125 W
Transition frequency: 3 MHz
Operating temperature range: -65°C to 150°C

Mechanical Parameters:

Mounting type: Through Hole
Package compatibility: TO-218 or equivalent thermal performance packages

The TIP35AG from onsemi satisfies all electrical parameter requirements and operates within the same thermal and frequency specifications. While the package designation differs (TO-247-3 versus TO-218-3), both are through-hole packages with equivalent thermal characteristics suitable for the specified power dissipation.

Parameter Comparison

Parameter	TIP35A (Central Semiconductor)	TIP35AG (onsemi)	Match Status
Transistor Type	NPN	NPN	Equivalent
Voltage - Collector Emitter Breakdown (Max)	60 V	60 V	Equivalent
Current - Collector (Ic) (Max)	25 A	25 A	Equivalent
Power - Max	125 W	125 W	Equivalent
Frequency - Transition	3 MHz	3 MHz	Equivalent
Operating Temperature Range	-65 to 150°C (TJ)	-65 to 150°C (TJ)	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
DC Current Gain (hFE) (Min)	10 @ 15A, 4V	15 @ 15A, 4V	TIP35AG Higher
Package / Case	TO-218-3	TO-247-3	Different Package
Product Status	Obsolete	Active	Substitute Active
RoHS Status	Not Specified	ROHS3 Compliant	Substitute Compliant

Engineering Selection Recommendations

The TIP35AG is the manufacturer-recommended substitute for the obsolete TIP35A. Selection of the TIP35AG is supported by the following factors:

Electrical Equivalence: All critical electrical parameters—breakdown voltage, collector current rating, power dissipation, and transition frequency—are identical between the two devices.

Product Status: The TIP35AG maintains active product status with onsemi, ensuring ongoing availability and manufacturing support. The TIP35A is obsolete and subject to inventory depletion.

Compliance: The TIP35AG is ROHS3 compliant and carries REACH Unaffected status, meeting current regulatory requirements for electronic component procurement.

Package Consideration: The TO-247-3 package used by the TIP35AG provides equivalent thermal performance to the TO-218-3 package of the TIP35A. Both are through-hole packages suitable for high-current applications. PCB layout modifications may be required to accommodate the different pin configuration of the TO-247-3 package.

Current Gain: The TIP35AG exhibits a higher minimum DC current gain (15 versus 10 at 15A, 4V), which does not compromise substitution and may improve circuit efficiency in current-driven applications.

Frequently Asked Questions (FAQ)

Q: Can the TIP35AG directly replace the TIP35A without circuit modification?

A: Electrical substitution is direct. The TIP35AG meets all electrical specifications of the TIP35A. However, the TO-247-3 package has a different pin layout than the TO-218-3 package. PCB footprint modification is required.

Q: What is the difference between the TO-218-3 and TO-247-3 packages?

A: Both are through-hole, three-terminal packages designed for high-power applications. The TO-247-3 provides a different mechanical footprint and pin spacing. Thermal performance is equivalent for the specified power dissipation of 125 W.

Q: Is the higher DC current gain of the TIP35AG (15 versus 10) a concern?

A: No. Higher current gain does not compromise substitution. In current-driven circuits, the higher gain of the TIP35AG may reduce base drive requirements, improving overall circuit efficiency.

Q: Are there any compliance differences between the TIP35A and TIP35AG?

A: The TIP35AG is ROHS3 compliant, while the TIP35A compliance status is not specified. Both carry REACH Unaffected status. The TIP35AG meets current regulatory requirements for new designs.

Q: What is the inventory status of these parts?

A: The TIP35A has 886 pieces in stock but is classified as obsolete. The TIP35AG has 850 pieces in stock and is an active product. For new procurement, the TIP35AG is the recommended choice.

Q: Are there any thermal considerations when switching from TIP35A to TIP35AG?

A: Both devices are rated for 125 W maximum power dissipation and operate across the same temperature range (-65°C to 150°C). Thermal design considerations remain unchanged.

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