STR-Y6765 Equivalent & Substitute Parts

Part Overview

The STR-Y6765 is an offline switching flyback converter IC manufactured by Sanken Electric USA Inc., designed for isolated power supply applications. This device integrates an internal power switch and operates in the 18.4kHz to 24.4kHz frequency range with a maximum power rating of 120W. The product is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and component procurement.

Substiute Parts

STR-Y6765

Sanken Electric USA Inc.In Stock: 3215STR-Y6765 Datasheet

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TOP246YN

Power IntegrationsIn Stock: 22608TOP246YN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the STR-Y6765 is determined by the following critical parameters:

• Topology: Flyback converter architecture with integrated internal switch
• Output Isolation: Isolated power delivery required
• Package Compatibility: TO-220-7 form factor for direct pin-compatible replacement
• Voltage Rating: Breakdown voltage of 800V or higher to maintain design margin
• Power Capacity: Minimum 120W rated power output
• Fault Protection: Current limiting, over-temperature, and over-voltage protection capabilities
• Supply Voltage Range: Input voltage compatibility with 9.4V ~ 35V operating window
• Compliance: RoHS compliance for regulatory alignment

The TOP246YN from Power Integrations meets these substitution criteria as an isolated flyback converter with integrated switching capability, compatible TO-220-7 packaging, and equivalent fault protection features.

Parameter Comparison

Engineering Selection Recommendations

The TOP246YN serves as a functional equivalent for the STR-Y6765 based on the following engineering criteria:

Topology and Isolation Compatibility: Both devices implement isolated flyback converter architecture with integrated power switches, maintaining circuit topology compatibility.

Package and Mounting: Both utilize TO-220-7 through-hole packaging, enabling direct mechanical and electrical pin compatibility without PCB redesign.

Power Rating: The TOP246YN rated at 125W exceeds the STR-Y6765 120W specification, providing adequate power delivery capacity.

Fault Protection: Both devices incorporate current limiting, over-temperature, and over-voltage protection. The STR-Y6765 includes additional over-load protection; this difference requires circuit-level evaluation for specific applications.

Compliance Status: Both devices maintain RoHS compliance, satisfying regulatory requirements. The TOP246YN carries "Not For New Designs" status, indicating limited long-term availability; however, it remains suitable for legacy system support and maintenance applications.

Operating Temperature Range: The TOP246YN supports -40°C to 150°C (TJ), exceeding the STR-Y6765 range of -20°C to 115°C (TA), providing enhanced thermal margin.

Switching Frequency Difference: The TOP246YN operates at 66kHz ~ 132kHz compared to the STR-Y6765 at 18.4kHz ~ 24.4kHz. This higher frequency may require transformer design adjustment and EMI filter optimization in the power supply circuit.

Frequently Asked Questions (FAQ)

Q: Can the TOP246YN directly replace the STR-Y6765 without PCB modifications?

A: Pin-compatible replacement is possible due to identical TO-220-7 package geometry. However, the higher switching frequency of the TOP246YN (66kHz ~ 132kHz versus 18.4kHz ~ 24.4kHz) requires transformer core and filter component re-evaluation to maintain EMI performance and efficiency specifications.

Q: What is the significance of the voltage breakdown rating difference (800V vs. 700V)?

A: The STR-Y6765 provides 100V additional breakdown margin. For applications operating near maximum input voltage conditions, this difference may impact design safety margins. Circuit analysis is required to confirm the TOP246YN's 700V rating is adequate for the specific application's maximum transient voltage conditions.

Q: Does the TOP246YN include over-load protection like the STR-Y6765?

A: The TOP246YN implements current limiting and over-voltage protection but does not specify over-load protection. Applications relying on dedicated over-load detection require external circuit implementation or alternative component selection.

Q: How does the higher operating temperature range of the TOP246YN affect system design?

A: The TOP246YN's -40°C to 150°C (TJ) range provides extended thermal operating margin compared to the STR-Y6765's -20°C to 115°C (TA) range. This allows operation in more demanding thermal environments without derating power output.

Q: Is the TOP246YN suitable for new product designs?

A: The TOP246YN carries "Not For New Designs" status, indicating the manufacturer does not recommend it for new development. It is appropriate for legacy system maintenance, repair, and limited-volume applications where component availability is established.

Q: What supply voltage compatibility exists between these devices?

A: The STR-Y6765 specifies 9.4V ~ 35V supply voltage range. The TOP246YN does not provide explicit supply voltage specification in the available parameters. Circuit design verification is required to confirm input voltage compatibility for the specific application.