FSQ510M Equivalent & Substitute Parts

Part Overview

The FSQ510M is an offline switch flyback converter IC manufactured by onsemi, designed for isolated power management applications. This component operates in the FPS™ series and features an integrated 700V breakdown voltage switch with current limiting, overload, and over-temperature protection. The FSQ510M is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

FSQ510M

onsemiIn Stock: 1013FSQ510M Datasheet

Current PartRFQ

FSL206MRN

onsemiIn Stock: 20128FSL206MRN Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FSQ510M is evaluated based on the following critical parameters that define functional equivalence in offline flyback converter applications:

Core Functional Parameters:

• Topology (Flyback converter architecture)
• Output Isolation (Isolated operation)
• Internal Switch capability
• Voltage - Breakdown rating (minimum 700V required for equivalent performance)
• Voltage - Supply range compatibility
• Switching Frequency range
• Power handling capacity
• Fault Protection features (Current Limiting, Overload, Over Temperature minimum)

Physical & Environmental Parameters:

• Operating Temperature range
• Package compatibility considerations
• Mounting type (Surface Mount vs. Through Hole)

The FSL206MRN qualifies as a substitute based on matching topology, isolation, internal switch architecture, and comprehensive fault protection. However, differences in breakdown voltage, supply voltage range, switching frequency, power rating, and package type must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the FSQ510M and FSL206MRN are obsolete products from onsemi's FPS™ series. Selection between these components must account for the following engineering considerations:

Breakdown Voltage: The FSQ510M operates at 700V while the FSL206MRN is rated at 650V. Applications requiring the full 700V rating cannot use the FSL206MRN as a direct substitute without circuit redesign.

Supply Voltage Range: The FSL206MRN accepts a wider input range (7V ~ 26V) compared to the FSQ510M (6.7V ~ 20V), providing greater flexibility in certain applications.

Switching Frequency: The FSQ510M operates at 94.3kHz ~ 132kHz, while the FSL206MRN operates at a fixed 67kHz. This difference affects transformer design, EMI characteristics, and component sizing.

Power Rating: The FSL206MRN is rated for 12W versus the FSQ510M's 9W, indicating higher power handling capability.

Fault Protection: The FSL206MRN includes Over Voltage protection in addition to the Current Limiting, Overload, and Over Temperature protection found in the FSQ510M.

Package & Mounting: The FSQ510M uses surface mount (8-SMD, 7 Leads), while the FSL206MRN uses through-hole (8-DIP). This represents a significant physical and assembly difference requiring PCB redesign.

Compliance: Both components are REACH Unaffected and classified as EAR99. The FSL206MRN carries RoHS3 compliance status.

Frequently Asked Questions (FAQ)

Q: Can the FSL206MRN directly replace the FSQ510M on an existing PCB?

A: No. The FSL206MRN uses through-hole DIP packaging while the FSQ510M uses surface mount SMD packaging. PCB redesign is required. Additionally, the 50V difference in breakdown voltage and fixed 67kHz switching frequency versus the FSQ510M's variable frequency range necessitate circuit evaluation.

Q: What is the primary difference in fault protection between these parts?

A: The FSL206MRN includes Over Voltage protection in addition to the Current Limiting, Overload, and Over Temperature protection present in the FSQ510M. This provides enhanced protection in the substitute part.

Q: Are both parts still available for new designs?

A: Both the FSQ510M and FSL206MRN are classified as obsolete. New design work should evaluate current-generation onsemi offline switch products from the FPS™ series or alternative manufacturers.

Q: How does the switching frequency difference affect circuit design?

A: The FSQ510M operates across a 94.3kHz ~ 132kHz range, while the FSL206MRN operates at a fixed 67kHz. This affects transformer core selection, output filter design, and EMI performance. Lower switching frequency typically results in larger magnetic components but may reduce switching losses.

Q: What supply voltage range should I use for compatibility?

A: The overlapping supply voltage range is 7V ~ 20V. Both parts operate within this window, though the FSL206MRN can extend to 26V if the application permits.