TOP104YN Equivalent & Substitute Parts

Part Overview

The TOP104YN is an offline switching converter IC manufactured by Power Integrations, designed for multiple topologies including Boost, Buck, Flyback, and Forward configurations. This device operates at 100kHz switching frequency with 110W power capability and is housed in a TO-220-3 package for through-hole mounting.

The TOP104YN is classified as Obsolete. Locating equivalent or substitute components is necessary for ongoing production support, design updates, and inventory management when original stock becomes unavailable.

Substiute Parts

TOP104YN

Power IntegrationsIn Stock: 16248TOP104YN Datasheet

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TOP244YN

Power IntegrationsIn Stock: 3712TOP244YN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the TOP104YN is determined by the following critical parameters:

Topology Compatibility: The TOP104YN supports Boost, Buck, Flyback, and Forward topologies. Substitute parts must support at least the topology required by the application circuit.

Package and Pinout: The TO-220-3 package with three leads defines the physical and electrical interface. Substitute parts with different package types (such as TO-220-7) require circuit redesign and are not direct pin-compatible replacements.

Voltage Rating: The 350V breakdown voltage establishes the maximum input voltage capability. Substitute parts with higher voltage ratings (such as 700V) provide additional design margin but are not required for applications within the 350V specification.

Power Rating: The 110W power capability defines the thermal and current handling limits. Substitute parts with lower power ratings (such as 65W) are not suitable for applications requiring the full 110W capability.

Switching Frequency: The 100kHz switching frequency affects transformer design, EMI characteristics, and efficiency. Substitute parts with different switching frequencies require circuit redesign.

Fault Protection Features: The TOP104YN includes Current Limiting and Over Temperature protection. Substitute parts with additional protection features (such as Over Voltage) provide enhanced safety but do not affect basic substitutability.

Based on these criteria, the TOP244YN is identified as a substitute part. However, significant design considerations apply due to differences in package type, voltage rating, power rating, switching frequency, and topology support.

Parameter Comparison

Engineering Selection Recommendations

Product Status Considerations:

The TOP104YN is classified as Obsolete, indicating that Power Integrations no longer manufactures or supports this device. The TOP244YN is classified as Not For New Designs, indicating limited availability and no active development support.

Both devices are legacy components. Selection of either part for new applications is not recommended. For ongoing production support of existing designs using TOP104YN, inventory management and long-term sourcing strategies should be evaluated.

Compliance and Certifications:

The TOP244YN carries RoHS Compliance certification, whereas the TOP104YN does not specify RoHS status. Both devices are REACH Unaffected and classified under ECCN EAR99 and HTSUS 8542.39.0001.

Design Compatibility:

The TOP244YN differs from the TOP104YN in four critical areas:

1. Package Type: TO-220-7 versus TO-220-3 requires PCB layout redesign and cannot be used as a direct pin-for-pin replacement.

2. Power Rating: 65W versus 110W limits the TOP244YN to lower power applications.

3. Topology Support: Flyback only versus multiple topologies restricts the TOP244YN to Flyback-based designs.

4. Switching Frequency: 66kHz ~ 132kHz variable range versus fixed 100kHz affects transformer design and EMI performance.

Substitution of TOP104YN with TOP244YN is only viable for Flyback topology applications operating at or below 65W power levels, with complete circuit redesign to accommodate the TO-220-7 package.

Frequently Asked Questions (FAQ)

Q: Can TOP244YN be used as a direct replacement for TOP104YN?

A: No. The TOP244YN uses a TO-220-7 package with six leads, whereas the TOP104YN uses a TO-220-3 package with three leads. Direct pin-for-pin replacement is not possible. Circuit redesign is required.

Q: What topologies does TOP244YN support?

A: The TOP244YN supports Flyback topology only. The TOP104YN supports Boost, Buck, Flyback, and Forward topologies. If your application uses Boost, Buck, or Forward topology, the TOP244YN is not suitable.

Q: Is the TOP244YN suitable for 110W applications?

A: No. The TOP244YN is rated for 65W maximum power. Applications requiring 110W power capability cannot use the TOP244YN.

Q: What is the difference in switching frequency between these devices?

A: The TOP104YN operates at a fixed 100kHz switching frequency. The TOP244YN operates at a variable frequency range of 66kHz to 132kHz. This difference affects transformer design, filter component selection, and EMI performance.

Q: Are both devices suitable for new designs?

A: No. The TOP104YN is Obsolete, and the TOP244YN is Not For New Designs. Both are legacy components. New designs should evaluate current-generation Power Integrations offline converter ICs.

Q: What is the voltage rating difference?

A: The TOP104YN has a 350V breakdown voltage rating. The TOP244YN has a 700V breakdown voltage rating. The higher rating in TOP244YN provides additional design margin for higher input voltage applications but does not affect substitutability for 350V-rated designs.

Q: Does TOP244YN include Over Voltage protection?

A: Yes. The TOP244YN includes Current Limiting, Over Temperature, and Over Voltage protection. The TOP104YN includes Current Limiting and Over Temperature protection only. The additional Over Voltage protection in TOP244YN provides enhanced fault handling capability.

Q: What is the moisture sensitivity level for both devices?

A: Both TOP104YN and TOP244YN have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage and handling.

Q: Is TOP244YN RoHS compliant?

A: Yes. The TOP244YN is RoHS Compliant. The TOP104YN does not specify RoHS status. If RoHS compliance is required for your application, the TOP244YN meets this requirement.