FSQ0365RL Equivalent & Substitute Parts

Part Overview

The FSQ0365RL is an offline switch flyback converter IC manufactured by onsemi, designed for isolated power management applications. This component operates in the 55kHz to 67kHz switching frequency range with a maximum power rating of 25W and features integrated current limiting, overload, over-temperature, and over-voltage protection. The FSQ0365RL is classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and production continuity.

Substiute Parts

FSQ0365RL

onsemiIn Stock: 10213FSQ0365RL Datasheet

Current PartRFQ

FSQ0365RLX

onsemiIn Stock: 1433FSQ0365RLX Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FSQ0365RL are identified based on strict electrical and mechanical parameter matching. The primary substitution criterion is the direct manufacturer equivalent FSQ0365RLX, which maintains identical electrical specifications across all critical parameters: 650V breakdown voltage, 8V to 20V supply voltage range, 55kHz to 67kHz switching frequency, 25W power rating, and identical fault protection features. Both parts share the same 8-LSOP package configuration and surface mount mounting type, ensuring mechanical compatibility.

The substitution logic is based on the following key parameters:

• Topology (Flyback)
• Output Isolation (Isolated)
• Voltage - Breakdown (650V)
• Voltage - Supply (8V ~ 20V)
• Frequency - Switching (55kHz ~ 67kHz)
• Power Rating (25W)
• Fault Protection capabilities
• Package / Case (8-SMD, Gull Wing)
• Supplier Device Package (8-LSOP)

Parameter Comparison

Engineering Selection Recommendations

The FSQ0365RLX is the direct manufacturer substitute for the obsolete FSQ0365RL. Both components are manufactured by onsemi and share identical electrical and mechanical specifications, ensuring functional equivalence in flyback converter applications. The FSQ0365RLX maintains active product status, providing ongoing availability and manufacturer support.

Key considerations for selection:

The FSQ0365RLX is ROHS3 compliant, whereas RoHS status is not specified for the FSQ0365RL. Both parts are REACH unaffected and classified under ECCN EAR99.

Moisture sensitivity differs between the two parts: FSQ0365RL has MSL 1 (unlimited moisture exposure tolerance), while FSQ0365RLX has MSL 3 (168-hour moisture exposure limit). This difference requires appropriate handling and storage protocols during manufacturing and assembly.

Packaging availability differs: FSQ0365RLX is supplied in Cut Tape (CT) format, whereas the original FSQ0365RL packaging type is not specified in available documentation.

Frequently Asked Questions (FAQ)

Q: Can FSQ0365RLX directly replace FSQ0365RL in existing designs?

A: Yes. The FSQ0365RLX is electrically and mechanically equivalent to the FSQ0365RL. All critical parameters including breakdown voltage, supply voltage range, switching frequency, power rating, fault protection features, and package configuration are identical. Pin-for-pin compatibility is maintained.

Q: What is the primary difference between FSQ0365RL and FSQ0365RLX?

A: The primary difference is product status: FSQ0365RL is obsolete while FSQ0365RLX is active. Additionally, FSQ0365RLX is ROHS3 compliant and has different moisture sensitivity specifications (MSL 3 versus MSL 1).

Q: Are there any thermal or electrical performance differences?

A: No. Both parts operate across the same temperature range (-40°C to 85°C) and maintain identical electrical specifications for voltage, frequency, and power ratings.

Q: What packaging formats are available for the substitute part?

A: FSQ0365RLX is available in Cut Tape (CT) packaging. Both parts use the 8-LSOP surface mount package configuration.

Q: Does the moisture sensitivity difference affect component selection?

A: The difference in MSL rating (1 versus 3) affects handling and storage requirements. MSL 3 components require controlled moisture exposure during manufacturing. Standard PCB assembly processes accommodate MSL 3 components without additional complexity.

Q: Are both parts compliant with international standards?

A: Both FSQ0365RL and FSQ0365RLX are REACH unaffected and classified under ECCN EAR99. FSQ0365RLX additionally carries ROHS3 compliance certification.