STR-Y6753 Equivalent & Substitute Parts

Part Overview

The STR-Y6753 is an offline switch flyback converter IC manufactured by Sanken Electric USA Inc., designed for isolated power management applications. This component operates in the 18.4kHz to 24.4kHz switching frequency range with a maximum power rating of 100W and features integrated current limiting, overload, over-temperature, and over-voltage protection. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

Substiute Parts

STR-Y6753

Sanken Electric USA Inc.In Stock: 125089STR-Y6753 Datasheet

Current PartRFQ

TOP256YN

Power IntegrationsIn Stock: 8919TOP256YN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the STR-Y6753 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 power switch
• Package / Case: TO-220-7 Formed Leads (mechanical and thermal compatibility)
• Mounting Type: Through Hole (PCB assembly compatibility)
• Fault Protection: Current Limiting, Over Temperature, Over Voltage (minimum protection set)

Secondary Compatibility Parameters:

• Voltage - Breakdown: Minimum 650V (electrical stress rating)
• Voltage - Supply (Vcc/Vdd): Overlapping or compatible supply range
• Power (Watts): Equal to or greater than 100W
• RoHS Compliance: Required for regulatory alignment

The TOP256YN from Power Integrations meets these substitution criteria while offering enhanced specifications in switching frequency and operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

The TOP256YN is a direct functional substitute for the STR-Y6753 in isolated flyback converter applications. Both components share identical topology, isolation architecture, package form factor, and mounting methodology. The TOP256YN offers superior specifications: higher breakdown voltage (700V vs. 650V), increased power capacity (119W vs. 100W), and extended operating temperature range (-40°C to 150°C vs. -20°C to 115°C).

The TOP256YN carries active product status from Power Integrations, ensuring ongoing availability and technical support. Both components maintain RoHS compliance and MSL-1 moisture sensitivity ratings, supporting equivalent supply chain and storage requirements.

The higher switching frequency of the TOP256YN (66kHz, 132kHz vs. 18.4kHz–24.4kHz) may require transformer and filter component redesign to maintain equivalent electromagnetic interference (EMI) characteristics and thermal performance in the application circuit.

Frequently Asked Questions (FAQ)

Q: Can the TOP256YN directly replace the STR-Y6753 without PCB modifications?

A: The TOP256YN shares the TO-220-7 package and through-hole mounting configuration with the STR-Y6753, enabling direct pin-compatible installation. However, the significantly higher switching frequency (66kHz/132kHz vs. 18.4kHz–24.4kHz) requires validation of transformer design, output filtering, and EMI performance to ensure equivalent circuit operation.

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

A: The primary differences are product status (TOP256YN is active; STR-Y6753 is obsolete), switching frequency (TOP256YN operates at higher frequencies), breakdown voltage (700V vs. 650V), power rating (119W vs. 100W), and operating temperature range (TOP256YN supports -40°C to 150°C vs. -20°C to 115°C).

Q: Are both components RoHS compliant?

A: Yes, both the STR-Y6753 and TOP256YN are RoHS compliant and carry MSL-1 moisture sensitivity ratings.

Q: What fault protection features does each component provide?

A: Both components include current limiting, over-temperature, and over-voltage protection. The STR-Y6753 additionally specifies overload protection.

Q: Is the TOP256YN suitable for applications requiring the STR-Y6753's lower switching frequency?

A: The TOP256YN's higher switching frequency may affect transformer core selection, filter component sizing, and overall circuit efficiency. Application-specific validation is required to confirm suitability for designs originally optimized for the STR-Y6753's 18.4kHz–24.4kHz operating range.