FSL4109LRN Equivalent & Substitute Parts

Part Overview

The FSL4109LRN is an offline switch flyback converter IC manufactured by onsemi, designed for power management applications requiring isolated flyback topology conversion. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The FSL4109LRN operates as a primary-side controller for offline flyback power supplies, providing integrated switching functionality for isolated DC-DC conversion applications.

Substiute Parts

FSL4109LRN

onsemiIn Stock: 877FSL4109LRN Datasheet

Current PartRFQ

FSL4110LRN

onsemiIn Stock: 14006FSL4110LRN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The FSL4109LRN is substituted by the FSL4110LRN based on functional equivalence within the onsemi offline switch flyback converter product family. Both components share the same manufacturer and operate within the offline flyback topology classification. The substitution is valid because both parts are designed for isolated power conversion applications and maintain compatibility with the same control architecture and application requirements.

The key parameters determining substitution validity are:

• Manufacturer alignment (onsemi)
• Topology classification (Flyback converter, offline operation)
• Functional purpose (Primary-side offline switch controller)
• Compliance standards (ROHS3 Compliant, REACH Unaffected)
• Isolation capability (Isolated output topology)

Parameter Comparison

Engineering Selection Recommendations

The FSL4110LRN is the designated substitute for the obsolete FSL4109LRN. Selection of the FSL4110LRN is appropriate for applications requiring offline flyback converter functionality with the following considerations:

Product Status Alignment: The FSL4110LRN maintains active product status with onsemi, ensuring continued availability, technical support, and manufacturing continuity. The FSL4109LRN obsolescence status eliminates it from new design consideration.

Compliance Certification: Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for electronic component deployment in regulated markets.

Functional Equivalence: The FSL4110LRN provides isolated flyback topology conversion with integrated primary-side switching control, matching the functional classification of the FSL4109LRN within the offline converter product category.

Packaging Consideration: The FSL4110LRN is supplied in 8-DIP through-hole packaging with 7 leads. Design integration requires verification of PCB layout compatibility with through-hole mounting requirements and DIP package footprint specifications.

Frequently Asked Questions (FAQ)

Q: Can the FSL4110LRN directly replace the FSL4109LRN in existing designs?

A: The FSL4110LRN is the designated substitute within the onsemi offline switch flyback converter family. Both components operate within the same topology classification and manufacturer ecosystem. PCB layout modifications may be required due to packaging differences, and circuit parameter verification is necessary to confirm application compatibility.

Q: What is the primary reason for substitution?

A: The FSL4109LRN is classified as obsolete. The FSL4110LRN is the active equivalent part within the onsemi product portfolio, providing continued availability and manufacturing support for offline flyback converter applications.

Q: Are there compliance differences between the two parts?

A: Both the FSL4109LRN and FSL4110LRN maintain ROHS3 compliance and REACH unaffected status. No compliance degradation occurs with substitution.

Q: What packaging differences exist?

A: The FSL4110LRN is supplied in 8-DIP (0.300", 7.62mm) through-hole packaging with 7 leads. The FSL4109LRN packaging specification is not provided in available documentation. Through-hole mounting requires PCB design accommodation for DIP package footprints.

Q: What are the key electrical specifications of the FSL4110LRN?

A: The FSL4110LRN operates at 50kHz switching frequency with 1000V breakdown voltage rating, 9W power capacity, and supply voltage range of 8V to 27V. Fault protection includes current limiting, overload, over-temperature, and over-voltage protection. Operating temperature range is -40°C to 125°C (junction temperature).

Q: Is the FSL4110LRN suitable for isolated power conversion applications?

A: Yes. The FSL4110LRN provides isolated output topology with integrated internal switching, designed for offline flyback converter applications requiring primary-side control and output isolation.