STR-W6753 Equivalent & Substitute Parts

Part Overview

The STR-W6753 is an offline flyback converter IC manufactured by Sanken Electric USA Inc., designed for isolated power supply applications with a 58W output capacity. This component operates in the 19kHz to 25kHz switching frequency range and features integrated current limiting, overload, and overvoltage protection with soft start control. The STR-W6753 is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

Substiute Parts

STR-W6753

Sanken Electric USA Inc.In Stock: 934STR-W6753 Datasheet

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TOP254YN

Power IntegrationsIn Stock: 4304TOP254YN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The TOP254YN from Power Integrations qualifies as a functional substitute for the STR-W6753 based on the following substitution criteria:

Core Functional Alignment:

• Both components implement isolated flyback converter topology
• Both feature integrated power switches with internal current limiting
• Both provide overvoltage protection and fault management
• Both are rated for through-hole mounting in TO-220 package families

Electrical Compatibility Parameters:

• Breakdown voltage: STR-W6753 (650V) vs. TOP254YN (700V) — higher rating in substitute provides margin
• Power capacity: STR-W6753 (58W) vs. TOP254YN (62W) — substitute meets or exceeds power requirement
• Fault protection: Both include current limiting and overvoltage protection
• RoHS compliance: Both components meet RoHS requirements

Package Consideration:

• STR-W6753: TO-220-6 (6 leads)
• TOP254YN: TO-220-7 (7 leads)

The additional lead in the TOP254YN package does not prevent substitution; PCB layout must accommodate the different pin configuration.

Parameter Comparison

Engineering Selection Recommendations

The TOP254YN is suitable as a substitute for the STR-W6753 in new designs and production transitions due to its active product status and full RoHS compliance. The substitute component provides higher breakdown voltage (700V vs. 650V) and equivalent power handling (62W vs. 58W), offering design margin for reliability.

The switching frequency difference (66kHz/132kHz vs. 19kHz–25kHz) requires transformer and filter component redesign. The TOP254YN's higher operating temperature range (-40°C to 150°C junction temperature vs. -20°C to 115°C ambient) supports extended environmental applications.

Pin configuration differences between TO-220-6 and TO-220-7 packages necessitate PCB layout modification. Both components maintain equivalent fault protection strategies with current limiting and overvoltage protection, though the TOP254YN adds over-temperature protection.

Frequently Asked Questions (FAQ)

Q: Can the TOP254YN directly replace the STR-W6753 without PCB modification?

A: No. The TOP254YN uses a TO-220-7 package with 7 leads, while the STR-W6753 uses TO-220-6 with 6 leads. PCB footprint and pin assignment must be updated. Consult the respective datasheets for pinout configuration before layout changes.

Q: What is the impact of the higher switching frequency in the TOP254YN?

A: The TOP254YN operates at 66kHz or 132kHz compared to the STR-W6753's 19kHz–25kHz range. Higher switching frequency reduces transformer size and filter component values but requires redesign of the magnetic and filtering circuits. Electromagnetic interference (EMI) characteristics will also differ.

Q: Are both components RoHS compliant?

A: Yes. Both the STR-W6753 and TOP254YN are RoHS compliant with MSL rating of 1 (Unlimited), meeting environmental and regulatory requirements for industrial and consumer applications.

Q: Why is the STR-W6753 marked as obsolete?

A: The STR-W6753 is no longer manufactured by Sanken Electric USA Inc. The TOP254YN from Power Integrations represents an active alternative that fulfills the same functional role in isolated flyback converter applications.

Q: Does the TOP254YN's higher breakdown voltage (700V vs. 650V) affect circuit design?

A: The higher breakdown voltage in the TOP254YN provides additional safety margin and does not negatively impact circuit performance. Existing voltage-rated components in the power supply design remain compatible.

Q: What protection features does each component provide?

A: The STR-W6753 includes current limiting, overload, and overvoltage protection with soft start control. The TOP254YN provides current limiting, over-temperature, and overvoltage protection. Both offer comprehensive fault management suitable for offline converter applications.