FPN660A Equivalent & Substitute Parts

Part Overview

The FPN660A is a PNP bipolar junction transistor manufactured by onsemi, rated for 60V collector-emitter breakdown voltage and 3A maximum collector current. This device is packaged in TO-226-3 (TO-92-3 Long Body) through-hole configuration and is designed for 1W power dissipation applications operating across -55°C to 150°C junction temperature range. The FPN660A is classified as obsolete, making identification of equivalent substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

FPN660A

onsemiIn Stock: 691FPN660A Datasheet

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ZTX751

Diodes IncorporatedIn Stock: 5697ZTX751 Datasheet

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ZTX951

Diodes IncorporatedIn Stock: 1337ZTX951 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FPN660A is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Transistor Type: PNP configuration required
• Voltage Rating: Minimum 60V collector-emitter breakdown voltage
• Current Rating: Minimum 3A collector current capacity
• Power Dissipation: Minimum 1W capability
• Mounting: Through-hole configuration
• Package Compatibility: TO-92 compatible pinout (E-Line equivalent to TO-92-3)

Substitute Parts Identified:

The ZTX751 (Diodes Incorporated) qualifies as a substitute with the following considerations: it meets the 60V voltage requirement and 1W power rating, operates through-hole mounting in E-Line (TO-92 compatible) package, but has a reduced maximum collector current of 2A compared to the FPN660A's 3A rating. This part is suitable for applications not requiring the full 3A current capacity.

The ZTX951 (Diodes Incorporated) qualifies as a substitute with enhanced specifications: it exceeds the 60V voltage requirement, provides 4A maximum collector current (exceeding the FPN660A's 3A), offers 1.2W power dissipation (exceeding the 1W requirement), and operates in E-Line (TO-92 compatible) through-hole package. This part is suitable for applications requiring equal or greater current capacity.

Parameter Comparison

Engineering Selection Recommendations

For ZTX751 Selection: The ZTX751 is suitable for applications where the FPN660A's 3A collector current is not fully utilized. This substitute is appropriate for designs operating at or below 2A collector current. The ZTX751 is an active product with ROHS3 compliance, providing long-term availability and regulatory alignment. The extended operating temperature range (-55°C to 200°C) provides additional thermal margin compared to the FPN660A. The higher transition frequency (140MHz) offers improved high-frequency performance characteristics.

For ZTX951 Selection: The ZTX951 is suitable for applications requiring the full 3A collector current capacity of the FPN660A or higher. This substitute provides 4A maximum collector current, exceeding the original specification. The ZTX951 is an active product with ROHS3 compliance. The extended operating temperature range (-55°C to 200°C) and increased power dissipation capability (1.2W) provide design margin. The improved saturation voltage characteristics (300mV at 4A) indicate superior switching performance.

Compliance Considerations: Both substitute parts carry REACH Unaffected status and EAR99 ECCN classification, matching the FPN660A regulatory profile. Both substitutes are ROHS3 compliant, providing environmental compliance advantages over the obsolete FPN660A.

Frequently Asked Questions (FAQ)

Q: Can the ZTX751 directly replace the FPN660A in all applications?

A: The ZTX751 is electrically compatible with the FPN660A for applications operating at collector currents of 2A or below. Applications requiring the full 3A collector current capacity of the FPN660A require the ZTX951 substitute. Both parts share identical 60V voltage ratings and 1W power dissipation capability. Package compatibility is confirmed through E-Line (TO-92 compatible) pinout equivalence to the FPN660A's TO-92-3 configuration.

Q: What are the key differences between ZTX751 and ZTX951 substitutes?

A: The primary difference is collector current capacity: ZTX751 provides 2A maximum while ZTX951 provides 4A maximum. The ZTX951 offers superior saturation voltage performance (300mV versus 500mV at respective rated currents) and higher power dissipation capability (1.2W versus 1W). Both parts operate across identical -55°C to 200°C temperature ranges and share E-Line (TO-92 compatible) packaging. Transition frequency differs slightly: ZTX751 at 140MHz versus ZTX951 at 120MHz.

Q: Are the substitute parts pin-compatible with the FPN660A?

A: Yes. Both ZTX751 and ZTX951 are packaged in E-Line-3 configuration, which is TO-92 compatible. The FPN660A is specified in TO-226-3 and TO-92-3 Long Body packages. The E-Line package maintains standard TO-92 three-pin PNP transistor pinout (Base, Collector, Emitter), ensuring direct mechanical and electrical compatibility in through-hole applications.

Q: What is the impact of the extended operating temperature range on substitution?

A: Both substitute parts operate across -55°C to 200°C junction temperature, compared to the FPN660A's -55°C to 150°C range. This extended upper temperature limit provides additional thermal margin and is advantageous for applications operating in elevated ambient conditions. No derating is required for applications within the FPN660A's original temperature specification.

Q: How do the saturation voltage characteristics affect circuit performance?

A: Saturation voltage differences are application-dependent. The FPN660A specifies 400mV at 200mA/2A, the ZTX751 specifies 500mV at 200mA/2A, and the ZTX951 specifies 300mV at 400mA/4A. Lower saturation voltage (ZTX951) results in reduced power dissipation during saturation and improved switching efficiency. Higher saturation voltage (ZTX751) has minimal impact in applications not operating at saturation limits.

Q: Are there inventory or availability considerations for these substitutes?

A: The FPN660A is obsolete with 630 pieces in stock. The ZTX751 has 5635 pieces in stock, and the ZTX951 has 1309 pieces in stock. Both substitutes are active products with established supply chains, providing superior long-term availability compared to the obsolete FPN660A.