FSQ0765RSWDTU Equivalent & Substitute Parts

Part Overview

The FSQ0765RSWDTU is an offline flyback converter IC manufactured by onsemi, designed for isolated power management applications. This device integrates a 650V internal switch with comprehensive fault protection including current limiting, overload, overvoltage, and short circuit protection. The part operates in the 48kHz to 67kHz switching frequency range with 90W power capability and is housed in a TO-220-6 package with U-forming leads.

The FSQ0765RSWDTU carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term production requirements for applications utilizing this offline converter topology.

Substiute Parts

FSQ0765RSWDTU

onsemiIn Stock: 2621FSQ0765RSWDTU Datasheet

Current PartRFQ

FSQ0565RQWDTU

Fairchild SemiconductorIn Stock: 1559FSQ0565RQWDTU Datasheet

Parametric EquivalentRFQ

FSQ0765RQWDTU

onsemiIn Stock: 4395FSQ0765RQWDTU Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FSQ0765RSWDTU is determined by strict alignment of the following critical parameters:

Topology & Isolation: Flyback converter with isolated output configuration Voltage Rating: 650V breakdown voltage with 8V to 20V supply range Switching Frequency: 48kHz to 67kHz operating band Fault Protection Suite: Current limiting, overload, overvoltage, short circuit, and overtemperature protection Package Compatibility: TO-220-6 full pack with through-hole mounting Operating Temperature Range: -25°C to 85°C

The identified substitute parts maintain these core electrical and mechanical specifications, ensuring functional equivalence within the same application domain. Variations in lead forming geometry (U-forming, W-forming, L-forming) and packaging format (bulk, tube) do not affect electrical performance and represent acceptable substitution variants.

Parameter Comparison

Engineering Selection Recommendations

FSQ0565RQWDTU (Fairchild Semiconductor): This substitute offers Active product status, providing assured long-term availability and manufacturing support. The part maintains electrical equivalence across all critical parameters with the exception of power rating (80W versus 90W). This 10W reduction in power capability must be evaluated against application requirements. The W-forming lead geometry is mechanically compatible with standard TO-220-6 PCB layouts. RoHS3 compliance status is not specified for this part.

FSQ0765RQWDTU (onsemi): This substitute maintains identical electrical specifications to the main part, including 90W power rating and ROHS3 compliance. However, it carries Obsolete product status, similar to the FSQ0765RSWDTU. The L-forming lead geometry differs from the U-forming variant but remains compatible with TO-220-6 through-hole mounting. This part is suitable for applications where lead forming geometry flexibility exists and where onsemi sourcing is preferred.

Selection between substitutes should prioritize application power requirements and supply chain continuity objectives. The FSQ0565RQWDTU provides the advantage of Active status for new designs requiring extended product lifecycle assurance.

Frequently Asked Questions (FAQ)

Q: Can FSQ0565RQWDTU replace FSQ0765RSWDTU in all applications? A: The FSQ0565RQWDTU is electrically equivalent across topology, isolation, voltage ratings, switching frequency, fault protection, and operating temperature. The primary difference is power rating: 80W versus 90W. Substitution is valid only for applications where the 80W power capability meets design requirements.

Q: What is the significance of lead forming geometry (U-forming, W-forming, L-forming)? A: Lead forming geometry affects the physical lead shape and spacing but does not alter electrical performance. All three variants are compatible with standard TO-220-6 through-hole PCB layouts. Selection may be driven by specific PCB design constraints or assembly equipment compatibility.

Q: Why is FSQ0765RQWDTU listed as a substitute if it has Obsolete status like the main part? A: FSQ0765RQWDTU provides an alternative sourcing option from onsemi inventory with identical electrical specifications and power rating. While both parts carry Obsolete status, this variant may have different inventory availability or lead time characteristics. For new designs, FSQ0565RQWDTU with Active status is recommended.

Q: Are there packaging format differences between these parts? A: The main part FSQ0765RSWDTU is supplied in bulk packaging, while FSQ0565RQWDTU is available in bulk and FSQ0765RQWDTU in tube packaging. Packaging format does not affect electrical performance and is determined by supplier inventory and order quantity requirements.

Q: What compliance certifications apply to these substitute parts? A: FSQ0765RSWDTU and FSQ0765RQWDTU are ROHS3 compliant. FSQ0565RQWDTU compliance status is not specified in available documentation. All three parts carry EAR99 ECCN classification and HTSUS code 8542.39.0001.