STR-W6053S Equivalent & Substitute Parts

Part Overview

The STR-W6053S is an offline flyback converter IC manufactured by Sanken Electric USA Inc., designed for isolated power supply applications. This device operates in the 60kHz to 74kHz switching frequency range with a maximum power rating of 90W and features integrated overcurrent, overload, overtemperature, and overvoltage protection. The product is currently obsolete, making identification of functionally equivalent alternatives essential for design continuity and component sourcing in legacy system maintenance and new designs requiring compatible specifications.

Substiute Parts

STR-W6053S

Sanken Electric USA Inc.In Stock: 2082STR-W6053S Datasheet

Current PartRFQ

TOP256YN

Power IntegrationsIn Stock: 8919TOP256YN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the STR-W6053S is determined by the following critical parameters:

• Topology: Flyback converter architecture is mandatory for functional equivalence
• Output Isolation: Isolated output configuration required
• Voltage - Breakdown: Minimum 650V to maintain voltage stress margin
• Voltage - Supply Range: Must accommodate 8.1V to 32V input
• Switching Frequency: Operating range of 60kHz to 74kHz ensures compatibility with existing transformer and filter designs
• Power Rating: Minimum 90W capability required
• Fault Protection: Current limiting, overtemperature, and overvoltage protection features must be present
• Package / Case: TO-220 form factor with through-hole mounting for PCB compatibility
• RoHS Compliance: Environmental and regulatory requirement

The TOP256YN from Power Integrations meets these substitution criteria as an active, functionally equivalent alternative.

Parameter Comparison

Engineering Selection Recommendations

The TOP256YN is a functionally equivalent substitute for the obsolete STR-W6053S based on the following engineering criteria:

• Product Status: The TOP256YN is an active product with ongoing manufacturing support, ensuring long-term component availability and supply chain continuity compared to the obsolete STR-W6053S.

• Regulatory Compliance: Both devices maintain RoHS compliance, satisfying environmental and regulatory requirements for equivalent component selection.

• Performance Envelope: The TOP256YN exceeds the STR-W6053S in breakdown voltage (700V vs. 650V) and power rating (119W vs. 90W), providing design margin for existing applications.

• Package Consideration: The TOP256YN uses a TO-220-7 package versus the TO-220-6 of the STR-W6053S. Pin configuration and PCB layout modifications are required for successful substitution.

• Operating Characteristics: The TOP256YN operates at 66kHz within the STR-W6053S switching frequency range, supporting direct transformer compatibility at this frequency. The 132kHz mode requires circuit design verification.

• Protection Features: The TOP256YN provides current limiting, overtemperature, and overvoltage protection. The absence of discrete overload protection requires verification against the original design's overload handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the TOP256YN directly replace the STR-W6053S without PCB modifications?

A: No. The TOP256YN uses a TO-220-7 package with 7 leads, while the STR-W6053S uses TO-220-6 with 6 leads. Pin configuration differences require PCB layout and schematic review before substitution.

Q: What is the primary reason for substituting the STR-W6053S?

A: The STR-W6053S is obsolete. The TOP256YN is an active product with equivalent flyback topology, isolated output, and comparable power handling, ensuring ongoing component availability.

Q: Are there switching frequency compatibility concerns?

A: The TOP256YN operates at 66kHz, which falls within the STR-W6053S range of 60kHz to 74kHz. Existing transformer designs optimized for this frequency band are compatible. The TOP256YN's 132kHz mode requires separate design validation.

Q: Does the TOP256YN provide the same protection features?

A: The TOP256YN includes current limiting, overtemperature, and overvoltage protection. The STR-W6053S includes an additional overload protection feature. Verify that the original design does not depend on discrete overload handling.

Q: What is the impact of the different duty cycle specifications?

A: The TOP256YN operates at 78% duty cycle versus 71% for the STR-W6053S. This difference affects transformer design parameters and energy storage. Transformer compatibility must be verified through design analysis.

Q: Is the TOP256YN suitable for the full operating temperature range of the original design?

A: The TOP256YN operates from -40°C to 150°C (junction temperature), exceeding the STR-W6053S range of -20°C to 115°C (ambient). This provides extended thermal margin for applications requiring the original temperature specification.

Q: What certifications apply to both devices?

A: Both the STR-W6053S and TOP256YN are RoHS compliant and classified under ECCN EAR99 with HTSUS code 8542.39.0001, maintaining regulatory equivalence for component selection.