FSQ0165RN Equivalent & Substitute Parts

Part Overview

The FSQ0165RN is an offline switch flyback converter IC manufactured by onsemi, designed for isolated power management applications. This 8-DIP through-hole component operates at 55kHz to 67kHz switching frequency with 15W power handling capability and integrated current limiting, overload, over-temperature, and over-voltage protection. The FSQ0165RN is classified as obsolete, making identification of suitable substitute components essential for ongoing design support, production continuity, and system maintenance.

Substiute Parts

FSQ0165RN

onsemiIn Stock: 4330FSQ0165RN Datasheet

Current PartRFQ

NCP1076AAP100G

onsemiIn Stock: 3277NCP1076AAP100G Datasheet

MFR RecommendedRFQ

FSQ0365RN

onsemiIn Stock: 5980FSQ0365RN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the FSQ0165RN are identified based on the following critical parameters that determine functional compatibility:

Topology Match: All substitutes maintain flyback converter topology with isolated output, ensuring circuit-level compatibility with existing transformer and feedback network designs.

Voltage Specifications: Substitutes operate within or exceed the supply voltage range (8V ~ 20V) and breakdown voltage rating (650V minimum), ensuring safe operation in the same input voltage environment.

Switching Frequency: Substitutes operate at compatible switching frequencies (55kHz ~ 67kHz range or higher), allowing transformer and filter component designs to function within acceptable operating parameters.

Power Rating: Substitutes meet or exceed the 15W power handling requirement, ensuring adequate capacity for the target application.

Package Compatibility: Through-hole DIP packaging is maintained to support existing PCB layouts and assembly processes.

Protection Features: All substitutes include current limiting, over-temperature, and over-voltage protection as minimum requirements.

Compliance: All substitutes maintain ROHS3 compliance and EAR99 classification, ensuring regulatory and export compliance equivalence.

Parameter Comparison

Engineering Selection Recommendations

FSQ0365RN (Parametric Equivalent): This component is the primary parametric equivalent, maintaining identical topology, voltage specifications, switching frequency range, and protection features as the FSQ0165RN. The FSQ0365RN is currently in active production status, ensuring long-term availability and supply chain stability. The increased power rating (25W versus 15W) provides design margin without requiring circuit modifications. Package and mounting specifications are identical, supporting direct PCB layout compatibility. This substitute is recommended for applications requiring minimal design changes and maximum compatibility assurance.

NCP1076AAP100G (Functional Equivalent): This component provides functional equivalence through identical flyback topology, isolated output, and comprehensive protection features. The NCP1076AAP100G is in active production status with extended operating temperature range (-40°C to 125°C junction temperature versus -40°C to 85°C ambient for FSQ0165RN). The higher breakdown voltage (700V) and lower startup voltage (8.4V) expand operational envelope compatibility. The 100kHz switching frequency requires transformer and filter component re-evaluation but enables smaller passive component sizing. The 31W power rating provides substantial design margin. Package differences (7-PDIP versus 8-DIP) require PCB layout modification. This substitute is suitable for designs where component re-qualification and PCB layout changes are acceptable.

Both substitutes maintain ROHS3 compliance and EAR99 classification, ensuring regulatory equivalence with the obsolete FSQ0165RN.

Frequently Asked Questions (FAQ)

Q: Can FSQ0365RN directly replace FSQ0165RN without PCB modifications?

A: Yes. The FSQ0365RN maintains identical package (8-DIP), pinout compatibility, topology, voltage specifications, and switching frequency range. Direct PCB substitution is supported without circuit redesign.

Q: What are the key differences between FSQ0365RN and NCP1076AAP100G?

A: FSQ0365RN maintains identical switching frequency (55kHz ~ 67kHz) and package format (8-DIP), requiring no transformer or PCB redesign. NCP1076AAP100G operates at 100kHz, requiring transformer re-design, and uses 7-PDIP packaging, requiring PCB layout modification. NCP1076AAP100G provides higher power rating (31W) and extended temperature range.

Q: Is the NCP1076AAP100G package compatible with FSQ0165RN PCB layouts?

A: No. NCP1076AAP100G uses 7-PDIP packaging while FSQ0165RN uses 8-DIP packaging. Although both are through-hole DIP formats with 0.300" (7.62mm) row spacing, the lead count difference requires PCB layout modification.

Q: What is the impact of switching frequency differences on circuit design?

A: FSQ0365RN maintains the 55kHz ~ 67kHz range of FSQ0165RN, allowing existing transformer and filter designs to function without modification. NCP1076AAP100G operates at 100kHz, requiring transformer core and winding re-design to maintain efficiency and thermal performance at the higher frequency.

Q: Are all substitutes ROHS3 compliant?

A: Yes. FSQ0365RN and NCP1076AAP100G are both ROHS3 compliant, maintaining regulatory equivalence with the obsolete FSQ0165RN.

Q: Which substitute is recommended for production continuity?

A: FSQ0365RN is recommended for production continuity due to identical package, pinout, topology, and switching frequency specifications, enabling direct PCB substitution without design changes. Both FSQ0365RN and NCP1076AAP100G are in active production status, ensuring long-term supply availability.