D45C8 Equivalent & Substitute Parts

Part Overview

The D45C8 is a PNP bipolar junction transistor manufactured by onsemi, rated for 60 V collector-emitter breakdown voltage and 4 A maximum collector current. This device is packaged in a TO-220-3 through-hole configuration and is designed for general-purpose switching and amplification applications. The D45C8 is classified as obsolete, making identification of functionally equivalent substitute parts necessary for ongoing design support and component procurement.

Key Parameters

Parameter	Value
Transistor Type	PNP
Voltage - Collector Emitter Breakdown (Max)	60 V
Current - Collector (Ic) (Max)	4 A
Power - Max	60 W
Frequency - Transition	32 MHz
Operating Temperature Range	-55°C to 150°C (TJ)
Package / Case	TO-220-3
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitute parts for the D45C8 are identified based on the following critical parameters that define functional equivalence:

Matching Criteria:

Transistor Type: PNP (required for polarity compatibility)
Voltage - Collector Emitter Breakdown: 60 V (required for voltage rating compatibility)
Package / Case: TO-220-3 (required for mechanical and thermal interface compatibility)
Mounting Type: Through Hole (required for PCB assembly compatibility)

Allowable Variations:

Current - Collector (Ic) (Max): Substitute parts may have equal or higher ratings
Power - Max: Substitute parts may have equal or lower ratings
Frequency - Transition: Substitute parts may have lower frequency ratings
DC Current Gain (hFE): Substitute parts may have different gain characteristics
Operating Temperature Range: Substitute parts may have equal or wider ranges

The substitute parts TIP42AG and TIP32AG meet all matching criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Parameter	D45C8	TIP42AG	TIP32AG
Manufacturer	onsemi	onsemi	onsemi
Transistor Type	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	60 V	60 V	60 V
Current - Collector (Ic) (Max)	4 A	6 A	3 A
Power - Max	60 W	2 W	2 W
Frequency - Transition	32 MHz	3 MHz	3 MHz
Operating Temperature Range	-55°C to 150°C	-65°C to 150°C	-65°C to 150°C
Package / Case	TO-220-3	TO-220-3	TO-220-3
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

TIP42AG Selection Criteria: The TIP42AG is an active product with ROHS3 compliance and current manufacturing support. It provides a higher maximum collector current rating (6 A) compared to the D45C8 (4 A), offering design margin for applications requiring increased current capacity. The TIP42AG maintains the 60 V voltage rating and TO-220-3 package compatibility. The reduced power rating (2 W versus 60 W) and transition frequency (3 MHz versus 32 MHz) reflect different thermal and frequency characteristics; applications requiring the original D45C8 specifications in these parameters require evaluation against actual circuit requirements.

TIP32AG Selection Criteria: The TIP32AG is an active product with ROHS3 compliance and current manufacturing support. It provides a lower maximum collector current rating (3 A) compared to the D45C8 (4 A), suitable for applications with reduced current requirements. The TIP32AG maintains the 60 V voltage rating and TO-220-3 package compatibility. Like the TIP42AG, the reduced power rating (2 W) and transition frequency (3 MHz) reflect different thermal and frequency characteristics.

Compliance Status: Both substitute parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component procurement.

Frequently Asked Questions (FAQ)

Q: Can the TIP42AG directly replace the D45C8 in all applications?

A: The TIP42AG is mechanically and electrically compatible at the TO-220-3 package level and maintains the 60 V voltage rating. However, the TIP42AG has a maximum power dissipation of 2 W compared to the D45C8's 60 W. Applications requiring the full 60 W power handling capability of the D45C8 cannot use the TIP42AG without thermal management modifications or circuit redesign.

Q: What is the difference between TIP42AG and TIP32AG?

A: The primary difference is the maximum collector current rating: TIP42AG is rated for 6 A while TIP32AG is rated for 3 A. Both maintain the 60 V voltage rating and TO-220-3 package. Selection between these parts depends on the circuit's current requirements. The D45C8 is rated for 4 A, placing it between these two options.

Q: Are the substitute parts pin-compatible with the D45C8?

A: Yes. All three parts use the TO-220-3 package with identical pin configurations: Base, Collector, and Emitter. Direct PCB mounting without modification is possible.

Q: Why is the D45C8 obsolete?

A: The D45C8 is classified as obsolete by the manufacturer. The TIP42AG and TIP32AG are active products with current manufacturing support and are recommended for new designs and ongoing procurement.

Q: Do the substitute parts have different operating temperature ranges?

A: The TIP42AG and TIP32AG both operate from -65°C to 150°C, which is a wider lower temperature range than the D45C8 (-55°C to 150°C). Both substitute parts are suitable for applications within the D45C8's original temperature specification.

Q: What compliance certifications apply to the substitute parts?

A: Both TIP42AG and TIP32AG are ROHS3 compliant and REACH unaffected. The D45C8 compliance status is not specified in the provided data.

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