TOP244YN Equivalent & Substitute Parts

Part Overview

The TOP244YN is an offline flyback converter IC from Power Integrations' TOPSwitch®-GX series, designed for isolated power supply applications. This device integrates a high-voltage power switch with comprehensive protection features including current limiting, over-temperature, and over-voltage protection. The part is designated as "Not For New Designs," indicating it has been superseded in the product lifecycle. For applications currently using TOP244YN, equivalent substitute parts within the TOPSwitch®-GX family provide functional alternatives with varying power output ratings while maintaining identical electrical and mechanical specifications.

Substiute Parts

TOP244YN

Power IntegrationsIn Stock: 3712TOP244YN Datasheet

Current PartRFQ

TOP242YN

Power IntegrationsIn Stock: 3740TOP242YN Datasheet

Parametric EquivalentRFQ

TOP243YN

Power IntegrationsIn Stock: 57383TOP243YN Datasheet

Parametric EquivalentRFQ

TOP245YN

Power IntegrationsIn Stock: 45423TOP245YN Datasheet

Parametric EquivalentRFQ

TOP246YN

Power IntegrationsIn Stock: 22608TOP246YN Datasheet

Parametric EquivalentRFQ

TOP247YN

Power IntegrationsIn Stock: 34266TOP247YN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution within the TOPSwitch®-GX family is determined by strict adherence to the following parameters:

Fixed Parameters (Must Match for Substitution):

• Topology: Flyback
• Package: TO-220-7 Formed Leads (TO-220-7C)
• Mounting Type: Through Hole
• Output Isolation: Isolated
• Voltage - Breakdown: 700V
• Switching Frequency: 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
• Series: TOPSwitch®-GX
• RoHS Status: RoHS Compliant
• MSL Rating: 1 (Unlimited)

Variable Parameter (Differentiates Part Selection):

• Power (Watts): Varies by part number

All substitute parts listed maintain identical electrical characteristics and mechanical form factor. The primary distinction is the rated power output, which determines suitability for specific application power requirements.

Parameter Comparison

Engineering Selection Recommendations

Selection of substitute parts for TOP244YN (65 W) must be based on application power requirements:

Lower Power Applications (Below 65 W):

• TOP242YN (22 W): Suitable for applications requiring up to 22 W output
• TOP243YN (45 W): Suitable for applications requiring 22 W to 45 W output

Equivalent Power Applications (At 65 W):

• TOP244YN remains the direct equivalent for 65 W designs

Higher Power Applications (Above 65 W):

• TOP245YN (85 W): Suitable for applications requiring 65 W to 85 W output
• TOP246YN (125 W): Suitable for applications requiring 85 W to 125 W output
• TOP247YN (165 W): Suitable for applications requiring 125 W to 165 W output

All listed parts share identical compliance certifications (RoHS Compliant, REACH Unaffected, EAR99 ECCN classification). The "Not For New Designs" status applies uniformly across the TOPSwitch®-GX family. Part selection is determined exclusively by matching the application's power output requirement to the rated power of the substitute device.

Frequently Asked Questions (FAQ)

Q: Can TOP242YN replace TOP244YN in an existing design?

A: TOP242YN is electrically and mechanically compatible with TOP244YN. However, TOP242YN is rated for 22 W maximum output, while TOP244YN is rated for 65 W. Substitution is only valid if the application power requirement does not exceed 22 W.

Q: What is the primary difference between TOP244YN and TOP245YN?

A: The primary difference is power rating. TOP244YN is rated for 65 W output, while TOP245YN is rated for 85 W output. All other electrical parameters, package specifications, and protection features are identical.

Q: Are all TOPSwitch®-GX parts in the same package?

A: Yes. TOP242YN, TOP243YN, TOP244YN, TOP245YN, TOP246YN, and TOP247YN all use the TO-220-7 Formed Leads package with through-hole mounting. Direct physical substitution is possible without PCB redesign.

Q: Can a higher-rated part substitute for a lower-rated part?

A: Yes. A higher-rated part (for example, TOP245YN at 85 W) can substitute for a lower-rated part (TOP244YN at 65 W) in the same application. The higher power rating provides design margin. However, thermal management and PCB layout considerations may require evaluation.

Q: Can a lower-rated part substitute for a higher-rated part?

A: No. A lower-rated part cannot substitute for a higher-rated part. Using TOP243YN (45 W) in an application designed for TOP244YN (65 W) will result in insufficient power delivery and potential device failure.

Q: Are there any differences in protection features between these parts?

A: No. All parts in this comparison include identical fault protection: current limiting, over-temperature protection, and over-voltage protection. Frequency control is also present in all variants.

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

A: This designation indicates the part is in the mature/end-of-life phase of its product lifecycle. While the part remains available and fully functional, Power Integrations recommends evaluating newer alternatives for new product development. Existing designs using these parts may continue to source them.

Q: Are all these parts RoHS compliant?

A: Yes. TOP242YN, TOP243YN, TOP244YN, TOP245YN, TOP246YN, and TOP247YN are all RoHS Compliant with MSL Rating 1 (Unlimited moisture sensitivity level).