TOP249YN Equivalent & Substitute Parts Reference

Part Overview

The TOP249YN is an offline flyback converter IC manufactured by Power Integrations, designed for isolated power supply applications. This device integrates a high-voltage switch with comprehensive protection features in a TO-220-7C package. The TOP249YN operates at switching frequencies between 66kHz and 132kHz with a maximum power rating of 250W and a 700V breakdown voltage rating.

The TOP249YN carries a "Not For New Designs" product status, indicating that Power Integrations has transitioned this device to end-of-life. For new design implementations, equivalent substitute parts with active product status are available to ensure long-term supply chain reliability and access to manufacturer support.

Substiute Parts

TOP249YN

Power IntegrationsIn Stock: 24211TOP249YN Datasheet

Current PartRFQ

TOP260YN

Power IntegrationsIn Stock: 86631TOP260YN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TOP249YN is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Package / Case: TO-220-7 Formed Leads, 6 Leads
• Mounting Type: Through Hole
• Output Isolation: Isolated
• Topology: Flyback
• Voltage - Breakdown: 700V
• Operating Temperature Range: -40°C ~ 150°C (TJ)
• Fault Protection: Current Limiting, Over Temperature, Over Voltage

Allowable Variation Parameters:

• Frequency - Switching: Must support the application's required frequency range
• Power (Watts): Must meet or exceed the application's power requirement
• Duty Cycle: May vary based on control architecture differences
• Series: Different TOPSwitch series permitted if all mandatory parameters align
• Product Status: Active status preferred for new designs

The TOP260YN qualifies as a substitute part because it maintains identical package, isolation, topology, voltage rating, temperature range, and protection features. Differences in switching frequency (fixed 66kHz vs. variable 66-132kHz), power rating (275W vs. 250W), and duty cycle (78% vs. 66.8%) reflect architectural improvements in the newer TOPSwitch®-HX series while preserving functional compatibility for equivalent applications.

Parameter Comparison

Engineering Selection Recommendations

For Existing Designs Using TOP249YN:

The TOP249YN remains functionally suitable for existing production and maintenance applications. Current inventory of 24,110 pieces supports ongoing supply for established designs. The "Not For New Designs" status reflects Power Integrations' product lifecycle management and does not indicate technical obsolescence.

For New Design Implementation:

The TOP260YN is the designated substitute for new designs. This device carries Active product status, ensuring continued manufacturer support, documentation updates, and long-term supply availability. The TOP260YN's higher power rating (275W vs. 250W) and improved efficiency characteristics (78% duty cycle) represent architectural enhancements in the TOPSwitch®-HX series. Inventory availability of 86,600 pieces provides robust supply chain security.

Compliance and Certification:

Both devices maintain identical RoHS compliance, REACH unaffected status, and EAR99 export classification. Moisture sensitivity level (MSL 1 - Unlimited) is equivalent, eliminating moisture management concerns during substitution.

Frequently Asked Questions (FAQ)

Q: Can TOP260YN directly replace TOP249YN in existing circuit designs?

A: Direct pin-compatible replacement is supported due to identical TO-220-7C packaging and lead configuration. However, design validation is required to confirm that the TOP260YN's fixed 66kHz switching frequency and 78% duty cycle are compatible with the transformer design and feedback network of the original TOP249YN circuit. The higher power rating (275W) does not create compatibility issues.

Q: What are the key differences between TOP249YN and TOP260YN?

A: The primary differences are: (1) Series architecture—TOP249YN uses TOPSwitch®-GX while TOP260YN uses TOPSwitch®-HX; (2) Switching frequency—TOP249YN operates across 66-132kHz range while TOP260YN is fixed at 66kHz; (3) Power rating—TOP260YN provides 275W versus TOP249YN's 250W; (4) Duty cycle—TOP260YN operates at 78% versus TOP249YN's 66.8%; (5) Product status—TOP260YN is Active while TOP249YN is Not For New Designs.

Q: Are there any thermal or reliability differences between these devices?

A: Both devices share identical operating temperature range (-40°C to 150°C junction temperature) and identical fault protection mechanisms (current limiting, over-temperature, over-voltage). Thermal performance depends on application-specific factors including transformer design, PCB layout, and heat dissipation provisions rather than inherent device differences.

Q: What is the significance of the "Not For New Designs" status for TOP249YN?

A: This status indicates that Power Integrations has concluded the development lifecycle for the TOPSwitch®-GX series TOP249YN and recommends newer alternatives for new product development. Existing designs may continue using TOP249YN, and current inventory supports this. However, new designs should adopt TOP260YN to ensure access to manufacturer technical support and long-term supply continuity.

Q: Are the pin assignments identical between TOP249YN and TOP260YN?

A: Both devices use the TO-220-7 package with 6 leads in formed lead configuration. Pin-level compatibility must be verified against the respective device datasheets to confirm functional equivalence for your specific application circuit.

Q: What packaging options are available for these devices?

A: Both TOP249YN and TOP260YN are supplied in Tube packaging with TO-220-7C supplier device package designation. This through-hole package is suitable for conventional PCB assembly processes.