MPS6521 Equivalent & Substitute Parts

Part Overview

The MPS6521 is an NPN bipolar junction transistor manufactured by onsemi, rated for 25 V collector-emitter breakdown voltage and 100 mA maximum collector current in a Through Hole TO-92 package. This device is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The MPS6521 is suitable for general-purpose switching and amplification applications within its specified electrical and thermal parameters.

Substiute Parts

MPS6521

onsemiIn Stock: 17966MPS6521 Datasheet

Current PartRFQ

2N2924 PBFREE

Central Semiconductor CorpIn Stock: 28202N2924 PBFREE Datasheet

DirectRFQ

2N2925 PBFREE

Central Semiconductor CorpIn Stock: 28972N2925 PBFREE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MPS6521 are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Transistor Type: NPN (identical)
• Voltage - Collector Emitter Breakdown (Max): 25 V (identical or higher)
• Mounting Type: Through Hole (identical)
• Package / Case: TO-92-3 (identical)

Secondary Compatibility Factors:

• Current - Collector (Ic) (Max): Substitute must support minimum 100 mA
• RoHS Compliance: Active substitute parts must meet current regulatory standards

The substitute parts 2N2924 PBFREE and 2N2925 PBFREE satisfy all primary substitution criteria. Both devices are manufactured by Central Semiconductor Corp, feature identical voltage ratings and package configurations, and are classified as Active products with RoHS3 compliance, providing regulatory advantage over the obsolete MPS6521.

Parameter Comparison

Engineering Selection Recommendations

2N2924 PBFREE and 2N2925 PBFREE are direct functional equivalents for the MPS6521 in applications requiring NPN transistors with 25 V breakdown voltage in TO-92-3 Through Hole packages.

Advantages of substitution:

• Both substitute parts are classified as Active products, ensuring long-term availability and manufacturing support
• ROHS3 compliance of substitute parts aligns with current regulatory requirements, whereas the MPS6521 is RoHS non-compliant
• Identical package and pinout configuration enables direct board-level replacement without layout modification
• Specified transition frequency of 160 MHz in substitute parts provides additional performance margin for switching applications

Compatibility confirmation:

• Electrical parameters (voltage rating, collector current capability) are compatible with MPS6521 application requirements
• Moisture sensitivity level (MSL 1) is identical across all three devices
• REACH and ECCN classifications are consistent across all parts

Frequently Asked Questions (FAQ)

Q: Can 2N2924 PBFREE and 2N2925 PBFREE be used interchangeably with MPS6521?

A: Yes. Both substitute parts meet the electrical and mechanical requirements for direct replacement. They share identical voltage ratings (25 V), package configuration (TO-92-3), and mounting type (Through Hole). The primary advantage is their Active product status and RoHS3 compliance compared to the obsolete MPS6521.

Q: What is the difference between 2N2924 PBFREE and 2N2925 PBFREE?

A: Both devices are electrically equivalent with identical voltage ratings, package configurations, and transition frequencies (160 MHz). The designations reflect different product lines from Central Semiconductor Corp. Selection between them is based on supplier availability and procurement requirements.

Q: Are there any thermal or operating temperature considerations for substitution?

A: The MPS6521 specifies an operating temperature range of -55°C to 150°C. The substitute parts do not provide explicit operating temperature specifications in the available data. Thermal performance should be verified against application-specific requirements if operation at temperature extremes is required.

Q: Does the higher transition frequency (160 MHz) of substitute parts affect compatibility?

A: No. Higher transition frequency is a performance enhancement that does not compromise compatibility. Applications designed for the MPS6521 will function correctly with substitute parts featuring 160 MHz transition frequency.

Q: Is the TO-92-3 (TO-226AA) package identical to the MPS6521 TO-92-3 (TO-226) package?

A: Both designations refer to the standard three-lead Through Hole TO-92 package. The packages are mechanically and electrically compatible for direct board-level substitution without layout changes.

Q: What is the significance of PBFREE designation in the substitute part numbers?

A: PBFREE indicates lead-free construction, consistent with RoHS3 compliance. This designation confirms the absence of lead in the solder and component materials, meeting current environmental and regulatory standards.