STR-W6754 Equivalent & Substitute Parts

Part Overview

The STR-W6754 is an offline switching flyback converter IC manufactured by Sanken Electric USA Inc., designed for isolated power supply applications. This component operates in the 19kHz to 25kHz switching frequency range with a maximum power rating of 160W and supports input voltages from 9.7V to 35V. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design considerations where similar performance characteristics are required.

Substiute Parts

STR-W6754

Sanken Electric USA Inc.In Stock: 945STR-W6754 Datasheet

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TOP247YN

Power IntegrationsIn Stock: 34266TOP247YN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the STR-W6754 is based on the following critical parameters that define functional equivalence:

Primary Substitution Criteria:

• Topology: Flyback converter architecture
• Output Isolation: Isolated configuration
• Internal Switch(s): Integrated switching element
• Voltage - Breakdown: Minimum 650V rating
• Voltage - Supply Range: Compatibility with 9.7V to 35V input
• Power Rating: Minimum 160W capability
• Fault Protection: Current limiting and over-voltage protection
• Mounting Type: Through-hole package compatibility
• RoHS Compliance: Environmental regulatory alignment

The TOP247YN from Power Integrations qualifies as a substitute based on these parameters. While it operates at a higher switching frequency (66kHz to 132kHz) and features a higher breakdown voltage (700V), it maintains the required isolated flyback topology, integrated switching capability, and exceeds the minimum power rating (165W). Both components are RoHS compliant and feature through-hole mounting in similar form factors.

Parameter Comparison

Engineering Selection Recommendations

The TOP247YN serves as a functional substitute for the STR-W6754 in isolated flyback converter applications. Both components maintain RoHS compliance and through-hole mounting compatibility. The TOP247YN provides higher breakdown voltage (700V vs. 650V) and extended operating temperature range (-40°C to 150°C vs. -20°C to 115°C), offering improved thermal and voltage margin characteristics.

The primary design consideration is the switching frequency differential: the TOP247YN operates at 66kHz to 132kHz compared to the STR-W6754's 19kHz to 25kHz range. This higher frequency may require transformer and filter component redesign to maintain equivalent performance. The TOP247YN's product status of "Not For New Designs" indicates it is also approaching obsolescence, suggesting evaluation of current-generation alternatives from Power Integrations' TOPSwitch product family for new applications.

Frequently Asked Questions (FAQ)

Q: Can the TOP247YN directly replace the STR-W6754 without circuit modifications?

A: Direct pin-for-pin replacement is not possible due to package differences (TO-220-6 vs. TO-220-7) and control feature variations. Circuit redesign is required, particularly in the transformer and output filter stages to accommodate the higher switching frequency of the TOP247YN.

Q: What are the key electrical differences between these parts?

A: The TOP247YN operates at significantly higher switching frequency (66kHz to 132kHz vs. 19kHz to 25kHz), features higher breakdown voltage (700V vs. 650V), and includes over-temperature protection in addition to current limiting and over-voltage protection. The STR-W6754 includes soft-start control, while the TOP247YN uses frequency control.

Q: Are both components suitable for new designs?

A: Neither component is recommended for new designs. The STR-W6754 is classified as obsolete, and the TOP247YN is marked "Not For New Designs." Current-generation alternatives should be evaluated for new applications.

Q: What is the impact of the switching frequency difference on system design?

A: Higher switching frequency in the TOP247YN reduces transformer core size and output filter component requirements but increases switching losses and electromagnetic interference considerations. Transformer design, inductor selection, and PCB layout must be re-evaluated for the higher frequency operation.

Q: Are there package compatibility considerations?

A: Yes. The STR-W6754 uses a TO-220-6 package while the TOP247YN uses TO-220-7. Although both are through-hole mounted, the additional lead and different pinout require PCB redesign and potential heatsinking modifications.

Q: Do both components meet current environmental standards?

A: Both the STR-W6754 and TOP247YN are RoHS compliant and have unlimited moisture sensitivity levels (MSL 1), meeting current environmental regulatory requirements.