TOP245Y Equivalent & Substitute Parts

Part Overview

The TOP245Y is an offline flyback converter IC from Power Integrations' TOPSwitch®-GX series, designed for isolated power supply applications. This component integrates a high-voltage switch with control circuitry in a TO-220-7 package, delivering 85 W output power with integrated fault protection.

The TOP245Y is classified as Obsolete, which necessitates identification of equivalent substitute parts for ongoing production support and design continuity. Substitute parts must maintain electrical and mechanical compatibility while meeting current compliance requirements.

Substiute Parts

TOP245Y

Power IntegrationsIn Stock: 1319TOP245Y Datasheet

Current PartRFQ

TOP245YN

Power IntegrationsIn Stock: 45423TOP245YN Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TOP245Y is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Topology: Flyback (isolated converter architecture)
• Output Isolation: Isolated
• Voltage - Breakdown: 700V
• Power Rating: 85 W
• Switching Frequency Range: 66kHz ~ 132kHz
• Duty Cycle: 66.5%
• Operating Temperature Range: -40°C ~ 150°C (TJ)
• Fault Protection: Current Limiting, Over Temperature, Over Voltage
• Control Features: Frequency Control

Mechanical Compatibility Requirements:

• Package / Case: TO-220-7 Formed Leads, 6 Leads
• Mounting Type: Through Hole
• Supplier Device Package: TO-220-7C

The TOP245YN qualifies as a direct substitute, sharing identical electrical specifications and mechanical packaging. The TOP245YN differs only in product status (Not For New Designs versus Obsolete) and RoHS compliance status (RoHS Compliant versus RoHS non-compliant).

Parameter Comparison

Engineering Selection Recommendations

For Existing Designs (Maintenance & Repair): The TOP245Y remains available with 1248 units in stock. Continued use is supported for maintenance applications where RoHS non-compliance is acceptable.

For Production Continuity: The TOP245YN is the direct electrical and mechanical equivalent. Selection of TOP245YN is appropriate for designs requiring RoHS compliance and sustained component availability. The TOP245YN carries "Not For New Designs" status but maintains superior inventory levels (45400 units) compared to the obsolete TOP245Y.

Compliance Considerations:

• TOP245Y: RoHS non-compliant, REACH Unaffected
• TOP245YN: RoHS Compliant, REACH Unaffected

Both parts carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Frequently Asked Questions (FAQ)

Q: Can TOP245YN directly replace TOP245Y in existing designs?

A: Yes. The TOP245YN is electrically and mechanically identical to the TOP245Y. Both components share the same 700V breakdown voltage, 85 W power rating, 66kHz ~ 132kHz switching frequency, TO-220-7 package, and fault protection architecture. Pin configuration and thermal characteristics are equivalent.

Q: What is the difference between TOP245Y and TOP245YN?

A: The primary differences are product status and RoHS compliance. TOP245Y is classified as Obsolete and RoHS non-compliant. TOP245YN is classified as Not For New Designs and RoHS Compliant. Electrical and mechanical specifications are identical.

Q: Why is TOP245Y classified as Obsolete?

A: Obsolete status indicates the part is no longer in active production. The TOP245YN represents the current equivalent offering from Power Integrations for this topology and power class.

Q: Are there packaging differences between TOP245Y and TOP245YN?

A: Both parts use TO-220-7 Formed Leads, 6 Leads package with through-hole mounting. TOP245YN is supplied in Tube packaging, while TOP245Y packaging is not specified in available documentation.

Q: What is the inventory situation for these parts?

A: TOP245Y has 1248 units in stock. TOP245YN has significantly higher availability at 45400 units in stock, providing better supply chain security for ongoing production.

Q: Can I use TOP245YN in a design originally specified for TOP245Y?

A: Yes, provided your design does not have specific RoHS non-compliance requirements. The TOP245YN is the recommended substitute for new production runs and maintenance applications.

Q: What are the key electrical parameters that define substitution compatibility?

A: Substitution compatibility is determined by: Flyback topology, isolated output, 700V breakdown voltage, 85 W power rating, 66kHz ~ 132kHz switching frequency, 66.5% duty cycle, -40°C ~ 150°C operating temperature range, and integrated current limiting, over-temperature, and over-voltage protection.