D44C8 Equivalent & Substitute Parts

Part Overview

The D44C8 is an NPN bipolar junction transistor manufactured by onsemi, rated for 60V collector-emitter breakdown voltage and 4A maximum collector current in a TO-220-3 through-hole package. This device is classified as obsolete, necessitating identification of equivalent substitute components for ongoing design requirements and production continuity. Substitute parts must maintain electrical compatibility within the specified voltage and current parameters while accommodating modern component availability and compliance standards.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	60 V
Current - Collector (Ic) (Max)	4 A
Power - Max	60 W
Frequency - Transition	40 MHz
Operating Temperature Range	-55°C ~ 150°C (TJ)
Package / Case	TO-220-3
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitute parts for the D44C8 are selected based on the following electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Transistor Type: NPN configuration required
Voltage Rating: Collector-emitter breakdown voltage of 60V minimum
Package: TO-220-3 through-hole mounting
Current Capability: Collector current rating sufficient for application requirements

Substitute Parts Identified:

The TIP31AG, TIP41AG, and 2N6487G are classified as equivalent substitutes based on matching the 60V voltage rating and TO-220-3 package specification. These parts differ in maximum collector current ratings (3A, 6A, and 15A respectively) and transition frequency characteristics, allowing selection based on specific application current demands. All substitute parts maintain NPN polarity and through-hole mounting compatibility with the original D44C8 footprint.

Parameter Comparison

Parameter	D44C8	TIP31AG	TIP41AG	2N6487G
Transistor Type	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	60 V	60 V	60 V	60 V
Current - Collector (Ic) (Max)	4 A	3 A	6 A	15 A
Power - Max	60 W	2 W	2 W	1.8 W
Frequency - Transition	40 MHz	3 MHz	3 MHz	5 MHz
Operating Temperature Range	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Last Time Buy	Active

Engineering Selection Recommendations

TIP31AG Selection Criteria: The TIP31AG is suitable for applications requiring collector current up to 3A at 60V. This substitute is classified as Active product status, ensuring continued availability and supply chain stability. RoHS3 compliance and REACH unaffected status provide regulatory alignment for modern manufacturing environments.

TIP41AG Selection Criteria: The TIP41AG accommodates collector current up to 6A at 60V, providing current capability above the original D44C8 specification. This part carries Last Time Buy status, indicating limited future availability. RoHS3 compliance is maintained. Selection of this substitute should account for extended lead times and inventory planning.

2N6487G Selection Criteria: The 2N6487G supports collector current up to 15A at 60V, offering the highest current capacity among available substitutes. Active product status ensures reliable long-term availability. RoHS3 compliance and REACH unaffected designation support regulatory requirements. This substitute is appropriate for applications where current headroom above 4A is beneficial.

Voltage and Package Compatibility: All substitute parts maintain the 60V collector-emitter breakdown voltage rating and TO-220-3 package specification, ensuring direct mechanical and electrical compatibility with existing PCB layouts and thermal management designs.

Frequently Asked Questions (FAQ)

Q: Can TIP31AG directly replace D44C8 in all applications?

A: TIP31AG maintains 60V voltage rating and TO-220-3 package compatibility. However, the maximum collector current is 3A compared to D44C8's 4A rating. Applications requiring sustained current above 3A require evaluation of TIP41AG or 2N6487G alternatives.

Q: What is the difference between TIP41AG and 2N6487G substitutes?

A: Both parts maintain 60V voltage rating and TO-220-3 packaging. TIP41AG supports 6A maximum collector current with 3MHz transition frequency. 2N6487G supports 15A maximum collector current with 5MHz transition frequency. Selection depends on application current requirements and frequency response needs.

Q: Are all substitute parts RoHS compliant?

A: TIP31AG, TIP41AG, and 2N6487G are all RoHS3 compliant. The original D44C8 does not specify RoHS status. Compliance verification is necessary for applications subject to RoHS regulatory requirements.

Q: Does operating temperature range differ between D44C8 and substitutes?

A: D44C8 operates from -55°C to 150°C. TIP31AG, TIP41AG, and 2N6487G operate from -65°C to 150°C, providing extended low-temperature capability. Applications operating below -55°C benefit from substitute part selection.

Q: What is the significance of transition frequency differences?

A: D44C8 specifies 40MHz transition frequency. Substitute parts range from 3MHz to 5MHz. Applications requiring high-frequency switching or RF performance may require frequency response evaluation before substitution.

Q: Is TIP41AG recommended for new designs?

A: TIP41AG carries Last Time Buy status, indicating limited future production. New designs should prioritize TIP31AG or 2N6487G for long-term supply chain stability and availability assurance.

Q: Can substitute parts be used interchangeably on existing PCBs?

A: All substitute parts use TO-220-3 through-hole packaging with identical pin configuration and footprint compatibility. Direct mechanical substitution on existing PCBs is supported without layout modification.

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