2N2643 Equivalent & Substitute Parts Reference

Part Overview

The 2N2643 is a dual NPN bipolar junction transistor (BJT) array manufactured by Central Semiconductor Corp, housed in a TO-78-6 metal can package. This component is classified as obsolete, with 982 units currently in stock. The 2N2643 is designed for applications requiring dual NPN transistor functionality with a maximum collector current of 30mA and collector-emitter breakdown voltage of 45V. Due to its obsolete status, equivalent substitute parts from active product lines are necessary for new designs and long-term supply chain continuity.

Substiute Parts

2N2643

Central Semiconductor CorpIn Stock: 10702N2643 Datasheet

Current PartRFQ

MAT01AH

Analog Devices Inc.In Stock: 1257MAT01AH Datasheet

MFR RecommendedRFQ

MAT01AHZ

Analog Devices Inc.In Stock: 1475MAT01AHZ Datasheet

MFR RecommendedRFQ

MAT01GH

Analog Devices Inc.In Stock: 1384MAT01GH Datasheet

MFR RecommendedRFQ

MAT01GHZ

Analog Devices Inc.In Stock: 2008MAT01GHZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 2N2643 are qualified based on the following critical parameters that determine functional compatibility:

Mandatory Matching Parameters:

• Transistor Type: 2 NPN (Dual) configuration
• Package / Case: TO-78-6 Metal Can
• Mounting Type: Through Hole
• Voltage - Collector Emitter Breakdown (Max): 45V

Allowable Parameter Variations:

• Current - Collector (Ic) (Max): Substitute parts may have equal or lower maximum ratings (25mA is acceptable as it is within the 30mA requirement)
• Power - Max: Substitute parts may have equal or lower ratings (500mW is acceptable as it is within the 600mW requirement)
• Frequency - Transition: Substitute parts may have equal or higher ratings (450MHz exceeds 40MHz requirement)

The MAT01 series from Analog Devices Inc. meets all mandatory matching criteria and operates within allowable parameter variations. All substitute parts maintain the same TO-78-6 through-hole package configuration and 45V breakdown voltage specification. The MAT01 series additionally provides matched pair transistor characteristics and active product status, ensuring long-term availability.

Parameter Comparison

Engineering Selection Recommendations

For New Designs: Select from the MAT01 series (MAT01AH, MAT01AHZ, MAT01GH, or MAT01GHZ) due to active product status and ROHS3 compliance. These parts ensure long-term supply chain availability and regulatory compliance for modern applications.

For Existing 2N2643 Designs: The MAT01 series substitutes are electrically compatible within the specified parameter ranges. The 25mA maximum collector current and 500mW power rating of MAT01 parts remain within typical application requirements for circuits originally designed around the 2N2643's 30mA and 600mW specifications.

Compliance Considerations: The 2N2643 is RoHS non-compliant. All MAT01 substitute parts are ROHS3 compliant, meeting current regulatory requirements for new product designs and manufacturing environments subject to RoHS directives.

Packaging and Thermal: All substitute parts maintain identical TO-78-6 through-hole metal can packaging, ensuring direct mechanical and electrical compatibility without PCB layout modifications. The MAT01 series specifies an operating temperature range of -55°C to 150°C (TJ), providing defined thermal performance parameters absent from the 2N2643 specification.

Frequently Asked Questions (FAQ)

Q: Can MAT01 parts directly replace 2N2643 in existing circuits?

A: Yes. The MAT01 series maintains the same TO-78-6 package, 45V breakdown voltage, and dual NPN configuration. The 25mA maximum collector current and 500mW power rating are within typical operating margins for circuits designed around the 2N2643's 30mA and 600mW specifications. Pin-for-pin compatibility is maintained.

Q: What is the difference between MAT01AH, MAT01AHZ, MAT01GH, and MAT01GHZ?

A: All four parts share identical electrical specifications and package configuration. The primary differences are packaging format (MAT01GHZ is specified as Bulk packaging) and current-collector cutoff specifications (MAT01AH and MAT01AHZ specify 300nA maximum; MAT01GH and MAT01GHZ specify 400nA maximum). Selection depends on procurement requirements and application leakage current tolerance.

Q: Why do MAT01 parts have higher transition frequency (450MHz vs. 40MHz)?

A: The MAT01 series is a more modern design with enhanced frequency performance. Higher transition frequency does not negatively impact applications designed for 40MHz operation; it provides additional performance margin and flexibility for higher-frequency applications.

Q: Are there any thermal performance differences?

A: The MAT01 series specifies an operating temperature range of -55°C to 150°C (TJ). The 2N2643 does not provide operating temperature specifications. For applications requiring defined thermal performance, the MAT01 series provides explicit temperature ratings.

Q: What is the significance of "Matched Pair" in the MAT01 description?

A: The MAT01 series transistors are factory-matched pairs, meaning the two NPN transistors within each package have closely controlled electrical characteristics. This is beneficial for applications requiring balanced dual-transistor performance, such as differential amplifiers or push-pull configurations.

Q: Is RoHS compliance important for my application?

A: RoHS compliance is mandatory for products sold in the European Union and increasingly required by major OEMs globally. The 2N2643 is RoHS non-compliant; all MAT01 substitutes are ROHS3 compliant. For new designs or products subject to RoHS regulations, MAT01 parts are the appropriate selection.

Q: Can I use MAT01 parts in high-temperature environments?

A: The MAT01 series is rated for operation up to 150°C (TJ). Verify that your specific application thermal requirements fall within this range. The 2N2643 does not specify maximum operating temperature, making the MAT01 series a more suitable choice for temperature-critical applications.