2N2639 Equivalent & Substitute Parts

Part Overview

The 2N2639 is a dual NPN bipolar junction transistor (BJT) array manufactured by Central Semiconductor Corp, housed in a TO-78-6 metal can package for through-hole mounting. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The 2N2639 is designed for general-purpose switching and amplification applications requiring dual NPN transistor functionality in a compact metal can configuration.

Substiute Parts

2N2639

Central Semiconductor CorpIn Stock: 11832N2639 Datasheet

Current PartRFQ

MAT01AH

Analog Devices Inc.In Stock: 1257MAT01AH Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2N2639 is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Transistor configuration: Dual NPN array (2 NPN)
• Maximum collector current: Equal to or greater than 30mA
• Collector-emitter breakdown voltage: Equal to or greater than 45V
• Package type: TO-78-6 metal can
• Mounting method: Through hole

Compliance and Status Considerations:

• The 2N2639 is obsolete; active alternatives are preferred for new designs
• RoHS compliance status and REACH applicability affect long-term supply chain viability

The MAT01AH from Analog Devices Inc. meets all electrical and mechanical compatibility criteria while offering active product status and improved compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution:

The MAT01AH is suitable as a substitute for the 2N2639 in applications where collector current does not exceed 25mA and power dissipation remains below 500mW. Both components share identical package geometry (TO-78-6 metal can), identical collector-emitter breakdown voltage (45V), and identical mounting method (through hole). Pin-to-pin compatibility is maintained.

Compliance Advantages:

The MAT01AH offers ROHS3 compliance, whereas the 2N2639 is RoHS non-compliant. For new designs or production environments with environmental compliance requirements, the MAT01AH is the preferred selection. Both components are REACH Unaffected and classified under ECCN EAR99.

Product Status Consideration:

The 2N2639 is obsolete. The MAT01AH maintains active product status with ongoing manufacturer support, ensuring long-term availability and technical documentation access.

Performance Characteristics:

The MAT01AH provides higher transition frequency (450MHz versus 40MHz), which may benefit high-frequency applications. The MAT01AH is specified as a matched pair, offering improved parameter tracking between the two transistors compared to the standard 2N2639 specification.

Frequently Asked Questions (FAQ)

Q: Can the MAT01AH directly replace the 2N2639 in all applications?

A: Direct replacement is possible when application requirements do not exceed the MAT01AH's maximum ratings. The critical limiting factors are maximum collector current (25mA for MAT01AH versus 30mA for 2N2639) and maximum power dissipation (500mW for MAT01AH versus 600mW for 2N2639). Verify that your circuit operates within these limits before substitution.

Q: Are the pin configurations identical between 2N2639 and MAT01AH?

A: Both components use the TO-78-6 metal can package with identical through-hole pin configuration. No PCB layout modifications are required for substitution.

Q: What is the significance of the MAT01AH being a "matched pair"?

A: The MAT01AH is specified as a matched pair, meaning the two NPN transistors within the package have tightly controlled parameter tracking. This characteristic is beneficial for differential amplifier circuits and precision analog applications where transistor parameter matching is critical. The 2N2639 does not carry this matched pair specification.

Q: Does the higher transition frequency of MAT01AH (450MHz) affect compatibility?

A: Higher transition frequency is a performance enhancement that does not negatively impact compatibility. Applications designed for the 2N2639's 40MHz transition frequency will function correctly with the MAT01AH's 450MHz capability. No circuit modifications are necessary.

Q: What is the impact of the 2N2639 being obsolete?

A: Obsolete status indicates that Central Semiconductor Corp no longer manufactures or supports this component. Existing inventory may be available from distributors, but long-term supply cannot be guaranteed. For new designs or production planning, substitution with an active component such as the MAT01AH is recommended.

Q: Are there environmental compliance differences between these parts?

A: Yes. The 2N2639 is RoHS non-compliant, while the MAT01AH is ROHS3 compliant. For applications subject to environmental regulations or customer requirements mandating RoHS compliance, the MAT01AH is the appropriate selection.

Q: What should I verify before implementing the MAT01AH as a substitute?

A: Verify that your circuit's maximum collector current does not exceed 25mA and that power dissipation per transistor remains below 500mW. Confirm that the TO-78-6 through-hole package is compatible with your PCB design. No other electrical or mechanical verification is required for standard switching and amplification applications.