STR-W6735 Equivalent & Substitute Parts

Part Overview

The STR-W6735 is an offline flyback converter IC manufactured by Sanken Electric USA Inc., designed for isolated power supply applications with 160W output capacity. This device operates in the 19kHz to 25kHz switching frequency range and features integrated current limiting, overload, and overvoltage protection with soft start control.

The STR-W6735 is classified as obsolete. Locating equivalent substitute parts is necessary to support ongoing production requirements, field repairs, and system redesigns where this component is no longer available from primary sources.

Substiute Parts

STR-W6735

Sanken Electric USA Inc.In Stock: 787STR-W6735 Datasheet

Current PartRFQ

TOP247YN

Power IntegrationsIn Stock: 34266TOP247YN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the STR-W6735 is determined by the following critical parameters:

• Topology: Flyback converter architecture
• Output Isolation: Isolated configuration
• Internal Switch(s): Integrated power switch required
• Voltage - Breakdown: Minimum 500V rating
• Power Output: Minimum 160W capability
• Fault Protection: Current limiting and overvoltage protection
• Package Compatibility: Through-hole mounting in TO-220 family packages
• RoHS Compliance: Environmental regulatory alignment

The TOP247YN from Power Integrations meets these core substitution criteria as an isolated flyback converter with integrated switching, protective features, and through-hole packaging. Differences in switching frequency, duty cycle, and operating temperature range reflect design variations within the flyback topology class but do not preclude functional equivalence in applications designed for the STR-W6735.

Parameter Comparison

Engineering Selection Recommendations

The TOP247YN qualifies as a functional substitute for the STR-W6735 based on matching topology, isolation architecture, integrated protection features, and through-hole packaging. Both devices are RoHS compliant and carry MSL-1 moisture sensitivity ratings.

The STR-W6735 is obsolete; the TOP247YN carries a "Not For New Designs" status. For applications requiring component selection, the TOP247YN provides equivalent isolated flyback conversion with higher breakdown voltage (700V vs. 500V) and extended operating temperature range (-40°C to 150°C vs. -20°C to 115°C). The higher switching frequency of the TOP247YN (66kHz–132kHz vs. 19kHz–25kHz) may require transformer and filter redesign to maintain equivalent electromagnetic interference performance and thermal characteristics.

Frequently Asked Questions (FAQ)

Q: Can the TOP247YN directly replace the STR-W6735 without circuit modification?

A: Both devices share isolated flyback topology, integrated power switching, and protective features. However, the TOP247YN operates at significantly higher switching frequency (66kHz–132kHz vs. 19kHz–25kHz). Direct pin-for-pin substitution may not be possible due to package differences (TO-220-7C vs. TO-220-6). Transformer design, output filtering, and control circuitry require evaluation for frequency compatibility.

Q: What are the key differences between these parts?

A: The TOP247YN features higher breakdown voltage (700V), extended operating temperature range, and higher switching frequency. The STR-W6735 operates at lower frequency with a narrower temperature range. Both provide equivalent power output (160W vs. 165W) and integrated protection.

Q: Are both parts RoHS compliant?

A: Yes. Both the STR-W6735 and TOP247YN are RoHS compliant with MSL-1 moisture sensitivity ratings.

Q: What is the package difference?

A: The STR-W6735 uses TO-220-6 packaging; the TOP247YN uses TO-220-7 packaging. Both are through-hole mounted, but pin count and layout differ. PCB redesign may be required.

Q: Why is the STR-W6735 marked obsolete?

A: The STR-W6735 is no longer manufactured or supported by Sanken Electric USA Inc. Substitute parts must be identified for continued system support and production.