STR-Y6763 Equivalent & Substitute Parts

Part Overview

The STR-Y6763 is an offline switching flyback converter IC manufactured by Sanken Electric USA Inc., designed for isolated power supply applications. This component operates in the 18.4kHz to 24.4kHz frequency range with an 80W power rating and features integrated current limiting, overload, over-temperature, and over-voltage protection. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

STR-Y6763

Sanken Electric USA Inc.In Stock: 12431STR-Y6763 Datasheet

Current PartRFQ

STR-Y6765

Sanken Electric USA Inc.In Stock: 3215STR-Y6765 Datasheet

Parametric EquivalentRFQ

TOP255YN

Power IntegrationsIn Stock: 4330TOP255YN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the STR-Y6763 is determined by the following critical parameters:

Topology & Isolation: All substitute parts must maintain flyback topology with isolated output configuration.

Voltage Ratings: Breakdown voltage and supply voltage ranges define the input/output capability envelope. Substitutes must support the 9.4V to 35V supply range and maintain adequate voltage stress margins.

Switching Frequency: The 18.4kHz to 24.4kHz operating range influences transformer design and EMI characteristics. Substitutes operating at different frequencies require transformer redesign.

Power Rating: The 80W nominal rating establishes thermal and current handling requirements. Higher-rated substitutes provide design margin; lower-rated parts are not suitable.

Protection Features: Current limiting, overload, over-temperature, and over-voltage protection are mandatory for safe operation.

Package Compatibility: TO-220-7 through-hole mounting is required for direct PCB compatibility.

Substitutes are classified as:

• Parametric Equivalent: Identical or superior electrical specifications within the same series
• Similar: Alternative manufacturer parts meeting core functional requirements with acceptable parameter variations

Parameter Comparison

Engineering Selection Recommendations

STR-Y6765 (Parametric Equivalent): This Sanken Electric part maintains identical electrical specifications to the STR-Y6763 within the same series (STR-Y6700). The 120W power rating provides design margin above the 80W requirement. Both parts share the same supply voltage range, startup voltage, switching frequency, and protection feature set. The STR-Y6765 is classified as obsolete, consistent with the main part status. This substitute is suitable for direct replacement in existing designs without circuit modification.

TOP255YN (Similar Substitute): This Power Integrations part operates as a flyback converter with isolated output and maintains RoHS compliance. The 81W power rating is equivalent to the STR-Y6763. However, the TOP255YN operates at significantly higher switching frequencies (66kHz and 132kHz) compared to the 18.4kHz to 24.4kHz range of the main part. This frequency difference requires transformer redesign and affects EMI filtering requirements. The TOP255YN is classified as active product status, ensuring long-term availability. The 700V breakdown voltage is lower than the 800V rating of the STR-Y6763, reducing voltage stress margin. The TOP255YN lacks overload protection specified in the main part. Selection of this substitute requires design validation and transformer recalculation.

Frequently Asked Questions (FAQ)

Q: Can STR-Y6765 be used as a direct drop-in replacement for STR-Y6763?

A: Yes. The STR-Y6765 maintains identical electrical specifications, supply voltage range, switching frequency, and protection features. No circuit modifications are required for direct substitution.

Q: What are the key differences between STR-Y6763 and TOP255YN?

A: The primary differences are switching frequency (18.4-24.4kHz vs. 66-132kHz), breakdown voltage (800V vs. 700V), and protection features. The TOP255YN lacks overload protection. The higher switching frequency of the TOP255YN requires transformer redesign and affects PCB layout and filtering.

Q: Is transformer redesign required when switching from STR-Y6763 to TOP255YN?

A: Yes. The switching frequency difference (18.4-24.4kHz vs. 66-132kHz) directly impacts transformer core selection, winding turns ratio, and inductance calculations. Existing transformer designs are not compatible.

Q: Are all substitute parts RoHS compliant?

A: Yes. STR-Y6765 and TOP255YN are both RoHS compliant, matching the compliance status of the STR-Y6763.

Q: What is the impact of the 700V breakdown voltage on TOP255YN compared to the 800V rating of STR-Y6763?

A: The 100V difference reduces the voltage stress margin in the power supply design. Applications operating near the upper limit of the supply voltage range may require circuit modifications to ensure adequate safety margins.

Q: Which substitute part has the longest product availability?

A: TOP255YN is classified as active product status, ensuring ongoing manufacturing and availability. Both STR-Y6763 and STR-Y6765 are obsolete, with availability limited to existing inventory.

Q: Can TOP255YN be used in applications requiring overload protection?

A: TOP255YN provides current limiting and over-temperature protection but does not include overload protection as specified in the STR-Y6763. Applications requiring overload protection must implement external protection circuitry or select an alternative substitute.