FSQ0765RQLDTU Equivalent & Substitute Parts

Part Overview

The FSQ0765RQLDTU is an offline flyback converter IC from onsemi's FPS™ series, designed for isolated power management applications. This device operates in the 48kHz to 67kHz switching frequency range with a maximum power rating of 90W and features a 650V breakdown voltage rating suitable for high-voltage input applications. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for design continuity and procurement planning.

Substiute Parts

FSQ0765RQLDTU

onsemiIn Stock: 2238FSQ0765RQLDTU Datasheet

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FSQ0765RQWDTU

onsemiIn Stock: 4395FSQ0765RQWDTU Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FSQ0765RQLDTU is determined by strict alignment of the following critical parameters:

• Topology: Flyback converter architecture
• Output Isolation: Isolated configuration
• Voltage - Breakdown: 650V rating
• Voltage - Supply Range: 8V ~ 20V input specification
• Voltage - Start Up: 12V threshold
• Switching Frequency: 48kHz ~ 67kHz operating range
• Power Rating: 90W maximum output
• Operating Temperature Range: -25°C ~ 85°C
• Package Type: TO-220-6 Full Pack, Formed Leads (TO-220F-6L)
• Mounting Type: Through Hole

The FSQ0765RQWDTU qualifies as a direct substitute based on identical alignment across all critical electrical and mechanical parameters. The primary distinction between these parts is packaging format (tube versus loose) and enhanced fault protection features in the substitute model.

Parameter Comparison

Engineering Selection Recommendations

Both the FSQ0765RQLDTU and FSQ0765RQWDTU are classified as obsolete products. Selection between these parts should be based on:

Packaging and Supply Chain Considerations: The FSQ0765RQWDTU is available in tube packaging with higher inventory levels (4315 pcs versus 2145 pcs), which may provide better long-term availability for production quantities.

Compliance Status: The FSQ0765RQWDTU carries RoHS3 compliance certification, whereas the FSQ0765RQLDTU does not specify RoHS status. For applications requiring RoHS compliance, the FSQ0765RQWDTU is the appropriate selection.

Fault Protection Features: The FSQ0765RQWDTU includes integrated fault protection (Current Limiting, Over Load, Over Temperature, Over Voltage, Short Circuit) with Sync control features, providing enhanced system reliability compared to the base FSQ0765RQLDTU.

Both parts share identical electrical specifications and package form factors, ensuring direct functional interchangeability in circuit designs.

Frequently Asked Questions (FAQ)

Q: Can FSQ0765RQWDTU be used as a direct replacement for FSQ0765RQLDTU?

A: Yes. Both parts share identical electrical parameters including topology, voltage ratings, switching frequency, power rating, and operating temperature range. The TO-220F-6L package form factor is identical, ensuring mechanical and electrical compatibility.

Q: What is the primary difference between these two part numbers?

A: The main differences are packaging format (tube versus loose) and fault protection features. The FSQ0765RQWDTU includes integrated current limiting, overload, over-temperature, over-voltage, and short-circuit protection with synchronous control, while the FSQ0765RQLDTU does not specify these features.

Q: Are there any pin configuration differences between these parts?

A: No. Both parts use the TO-220-6 Full Pack with formed leads (TO-220F-6L), maintaining identical pin assignments and mechanical dimensions.

Q: Which part should be selected for new designs?

A: Since both parts are classified as obsolete, neither is recommended for new designs. Alternative current-generation flyback converter ICs from onsemi or other manufacturers should be evaluated for new applications.

Q: Does the FSQ0765RQWDTU meet RoHS requirements?

A: Yes. The FSQ0765RQWDTU is RoHS3 compliant. The FSQ0765RQLDTU does not specify RoHS compliance status.

Q: Are these parts suitable for high-temperature applications?

A: Both parts operate across the -25°C to 85°C temperature range. Applications requiring operation beyond 85°C require alternative components.