FPN660 Equivalent & Substitute Parts

Part Overview

The FPN660 is a PNP bipolar junction transistor manufactured by onsemi, rated for 60V collector-emitter breakdown voltage and 3A maximum collector current. This component is packaged in TO-226-3 and TO-92-3 Long Body configurations for through-hole mounting applications. The FPN660 operates across a temperature range of -55°C to 150°C and delivers 1W maximum power dissipation with a transition frequency of 75MHz.

The FPN660 is classified as obsolete. Substitute components are necessary to maintain design continuity and ensure availability for new production builds and field replacements. Alternative PNP transistors with equivalent or superior electrical characteristics are available from active product lines.

Substiute Parts

FPN660

onsemiIn Stock: 1105FPN660 Datasheet

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ZTX751

Diodes IncorporatedIn Stock: 5697ZTX751 Datasheet

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ZTX949

Diodes IncorporatedIn Stock: 2363ZTX949 Datasheet

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ZTX951

Diodes IncorporatedIn Stock: 1337ZTX951 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FPN660 is determined by the following critical electrical parameters:

Primary Substitution Criteria:

• Transistor Type: PNP configuration
• Voltage - Collector Emitter Breakdown (Max): 60V minimum
• Current - Collector (Ic) (Max): 3A minimum
• Power - Max: 1W minimum
• Mounting Type: Through Hole
• Package Compatibility: TO-92 compatible or E-Line (TO-92 compatible)

Secondary Compatibility Factors:

• Operating Temperature Range: -55°C minimum to 150°C minimum
• Vce Saturation characteristics
• Frequency - Transition: 75MHz minimum

The substitute parts listed below meet or exceed the electrical specifications of the FPN660 while maintaining through-hole mounting compatibility. All substitute components are classified as Active products with current manufacturing status and full compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

ZTX951 (Primary Substitute)

The ZTX951 is the optimal substitute for the FPN660. This component matches the 60V collector-emitter breakdown voltage specification and exceeds the 3A current requirement with a 4A maximum rating. The ZTX951 delivers superior transition frequency performance at 120MHz compared to the FPN660's 75MHz. The E-Line package is mechanically compatible with TO-92 footprints. The ZTX951 is manufactured by Diodes Incorporated as an active product with ROHS3 compliance and full REACH compliance status.

ZTX751 (Secondary Substitute)

The ZTX751 maintains the 60V voltage rating and 1W power specification of the FPN660. The maximum collector current is rated at 2A, which is below the FPN660's 3A specification. This component is suitable for applications where the circuit design operates at collector currents below 2A. The ZTX751 provides enhanced transition frequency at 140MHz. This component is active and ROHS3 compliant.

ZTX949 (Limited Substitution)

The ZTX949 is not recommended as a direct substitute for the FPN660. The collector-emitter breakdown voltage is rated at 30V, which is below the FPN660's 60V specification. This component is suitable only for applications where the circuit design operates at 30V or lower supply voltages. The ZTX949 exceeds the current requirement with a 4.5A maximum rating and provides superior power dissipation at 1.58W. This component is active and ROHS3 compliant.

All substitute components are classified as Active products with current manufacturing availability and full regulatory compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can the ZTX751 replace the FPN660 in all applications?

A: The ZTX751 is suitable for applications where the maximum collector current does not exceed 2A. The FPN660 is rated for 3A maximum collector current. If the circuit design requires operation at collector currents between 2A and 3A, the ZTX751 is not appropriate. The ZTX951 is the preferred substitute for full current capability.

Q: What is the difference between the TO-226 package and the E-Line package?

A: The FPN660 is supplied in TO-226-3 and TO-92-3 Long Body packages. The substitute components are supplied in E-Line-3 packages, which are mechanically compatible with TO-92 footprints. Both package types are through-hole configurations with identical pin spacing and lead geometry suitable for standard PCB mounting.

Q: Does the ZTX949 meet the voltage requirements of the FPN660?

A: The ZTX949 is rated for 30V maximum collector-emitter breakdown voltage, which is below the FPN660's 60V specification. The ZTX949 is not suitable for circuits designed to operate at voltages above 30V. Use the ZTX951 for 60V voltage compatibility.

Q: Are all substitute parts RoHS compliant?

A: Yes. The ZTX751, ZTX949, and ZTX951 are all ROHS3 compliant. The FPN660 product status does not specify RoHS compliance. All substitute components meet current environmental and regulatory standards.

Q: What is the operating temperature range difference between the FPN660 and substitute parts?

A: The FPN660 operates from -55°C to 150°C. The ZTX751, ZTX949, and ZTX951 all operate from -55°C to 200°C. The substitute components provide extended high-temperature operation capability. Applications requiring operation above 150°C benefit from this extended range.

Q: Which substitute part provides the best frequency performance?

A: The ZTX751 provides the highest transition frequency at 140MHz, compared to the FPN660's 75MHz. The ZTX951 operates at 120MHz, and the ZTX949 operates at 100MHz. All substitute components exceed the FPN660's frequency specification.

Q: Can I use the ZTX951 as a drop-in replacement for the FPN660?

A: The ZTX951 is mechanically and electrically compatible with the FPN660 for through-hole PCB mounting. The E-Line package is compatible with TO-92 footprints. Electrical characteristics meet or exceed the FPN660 specifications. Verification of circuit performance is required for specific application requirements.