FSQ0265RL Equivalent & Substitute Parts

Part Overview

The FSQ0265RL is an offline switch flyback converter IC manufactured by onsemi, designed for isolated power management applications. This component operates at 55kHz to 67kHz switching frequency with a 20W power rating and 650V breakdown voltage. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for design continuity and procurement planning.

Substiute Parts

FSQ0265RL

onsemiIn Stock: 22714FSQ0265RL Datasheet

Current PartRFQ

FSQ0265RLX

onsemiIn Stock: 24889FSQ0265RLX Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FSQ0265RL is determined by strict equivalence across the following critical parameters:

• Topology: Flyback converter architecture
• Voltage - Breakdown: 650V minimum rating
• Voltage - Supply (Vcc/Vdd): 8V ~ 20V operating range
• Frequency - Switching: 55kHz ~ 67kHz operating band
• Power (Watts): 20W nominal output
• Output Isolation: Isolated configuration
• Internal Switch(s): Integrated switching element
• Fault Protection: Current Limiting, Over Load, Over Temperature, Over Voltage
• Control Features: Sync capability
• Operating Temperature: -40°C ~ 85°C (TA)
• Package / Case: 8-SMD, Gull Wing
• Supplier Device Package: 8-LSOP
• Mounting Type: Surface Mount

The FSQ0265RLX is a direct substitute variant of the FSQ0265RL, differing only in packaging configuration (Tape & Reel versus standard packaging) and moisture sensitivity level classification.

Parameter Comparison

Engineering Selection Recommendations

The FSQ0265RLX is the direct equivalent substitute for the FSQ0265RL. Both components are classified as obsolete products from onsemi's FPS™ series. The FSQ0265RLX provides identical electrical and thermal performance across all critical parameters: 650V breakdown voltage, 8V to 20V supply range, 55kHz to 67kHz switching frequency, and 20W power rating.

The primary distinction between these parts is packaging format and moisture sensitivity classification. The FSQ0265RLX is supplied in Tape & Reel (TR) configuration with ROHS3 compliance certification, whereas the FSQ0265RL uses standard packaging without specified RoHS status. The FSQ0265RLX carries a higher moisture sensitivity level (MSL 3, 168 hours) compared to the FSQ0265RL (MSL 1, unlimited).

Selection between these variants should be based on procurement requirements, supply chain availability, and packaging specifications for automated assembly processes. Both parts maintain functional equivalence for isolated flyback converter applications within the specified electrical and thermal operating ranges.

Frequently Asked Questions (FAQ)

Q: Can FSQ0265RLX be used as a direct replacement for FSQ0265RL in existing designs?

A: Yes. The FSQ0265RLX is electrically and functionally identical to the FSQ0265RL across all critical parameters including topology, voltage ratings, switching frequency, power rating, and fault protection features. The primary differences are packaging format (Tape & Reel) and moisture sensitivity classification.

Q: What is the significance of the different Moisture Sensitivity Levels (MSL)?

A: FSQ0265RL carries MSL 1 (unlimited shelf life without moisture control), while FSQ0265RLX carries MSL 3 (168-hour maximum exposure to 85°C/85% RH conditions). MSL 3 components require controlled storage and handling procedures to prevent moisture absorption prior to soldering.

Q: Are both parts suitable for the same PCB assembly processes?

A: Both components use identical 8-LSOP surface mount packages with gull wing leads. The FSQ0265RLX in Tape & Reel format is optimized for high-volume automated assembly, while the FSQ0265RL standard packaging may be used for lower-volume or manual assembly operations.

Q: What compliance certifications apply to these parts?

A: The FSQ0265RLX carries ROHS3 compliance certification. Both parts are REACH Unaffected and classified under ECCN EAR99 for export control purposes.

Q: Why are both parts listed as obsolete?

A: Both FSQ0265RL and FSQ0265RLX are obsolete products from onsemi. For new designs requiring offline flyback converter functionality, consultation with onsemi's current product portfolio is recommended to identify active alternatives within the FPS™ series or successor product lines.