FSFM260N Equivalent & Substitute Parts

Part Overview

The FSFM260N is an offline switch flyback converter IC manufactured by onsemi, designed for isolated power management applications. This 8-DIP through-hole component operates at 67kHz switching frequency with 35W power handling capability and integrated fault protection including current limiting, overload, overvoltage, and overtemperature protection.

The FSFM260N carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support legacy system maintenance or redesign initiatives.

Substiute Parts

FSFM260N

onsemiIn Stock: 17899FSFM260N Datasheet

Current PartRFQ

FSGM300N

onsemiIn Stock: 17577FSGM300N Datasheet

SimilarRFQ

FSFM300N

onsemiIn Stock: 15693FSFM300N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FSFM260N is determined by the following critical parameters:

• Topology & Isolation: Flyback converter with isolated output
• Package & Mounting: 8-DIP through-hole form factor
• Switching Frequency: 67kHz operation
• Voltage Ratings: Breakdown voltage of 650V; supply voltage compatibility
• Fault Protection: Current limiting, overload, overvoltage, and overtemperature protection
• Compliance: ROHS3 compliance and REACH unaffected status

Two substitute parts meet these criteria: FSGM300N and FSFM300N. Both maintain the same topology, package, switching frequency, and core protection features. The FSFM300N provides parametric equivalence with identical supply voltage range (8V ~ 21V) and operating temperature range (-25°C ~ 85°C). The FSGM300N offers enhanced specifications with wider supply voltage range (7.7V ~ 26V) and extended operating temperature range (-40°C ~ 125°C), though it includes additional short-circuit protection.

Parameter Comparison

Engineering Selection Recommendations

FSFM300N is the primary substitute for direct replacement of FSFM260N. It maintains identical supply voltage range (8V ~ 21V), operating temperature range (-25°C ~ 85°C), and fault protection features. Both parts share the same parametric specifications and thermal operating conditions. The FSFM300N carries active product status, ensuring ongoing availability and supply chain support. This part is suitable for applications requiring exact parameter matching with the original FSFM260N.

FSGM300N is an alternative substitute offering enhanced specifications. It provides wider supply voltage tolerance (7.7V ~ 26V) and extended operating temperature range (-40°C ~ 125°C), making it suitable for applications with more demanding environmental or input voltage requirements. The FSGM300N includes additional short-circuit protection beyond the FSFM260N specification. This part is appropriate for new designs or redesigns where the enhanced thermal and voltage specifications provide system-level benefits. Both substitute parts are ROHS3 compliant and REACH unaffected, maintaining regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can FSFM300N directly replace FSFM260N in existing designs?

A: Yes. The FSFM300N maintains identical supply voltage range (8V ~ 21V), switching frequency (67kHz), duty cycle (77%), and operating temperature range (-25°C ~ 85°C). The 8-DIP through-hole package is mechanically and electrically compatible. Pin configuration and fault protection features are equivalent.

Q: What is the difference between FSFM300N and FSGM300N?

A: Both are active substitutes with 40W power rating and identical topology. FSGM300N offers wider supply voltage range (7.7V ~ 26V versus 8V ~ 21V) and extended operating temperature range (-40°C ~ 125°C versus -25°C ~ 85°C). FSGM300N includes short-circuit protection as an additional fault protection feature. FSFM300N provides parametric equivalence to FSFM260N.

Q: Are both substitute parts available in the same packaging?

A: Yes. Both FSGM300N and FSFM300N are supplied in 8-DIP through-hole packages with 0.300" (7.62mm) spacing, identical to FSFM260N. Both are available in tube packaging.

Q: Why is FSFM260N marked as obsolete?

A: The FSFM260N has reached end-of-life status. FSFM300N and FSGM300N are active products offering equivalent or enhanced functionality, ensuring continued design support and component availability.

Q: Do the substitute parts maintain the same compliance certifications?

A: Yes. Both FSFM300N and FSGM300N are ROHS3 compliant and REACH unaffected, matching the regulatory status of FSFM260N.

Q: Which substitute should be selected for new designs?

A: FSFM300N is recommended for applications requiring exact parameter matching. FSGM300N is recommended for applications requiring extended temperature range or wider input voltage tolerance.