TOP245YN Equivalent & Substitute Parts Reference

Part Overview

The TOP245YN 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 control circuitry in a TO-220-7C package, delivering 85 W output power across a 66 kHz to 132 kHz switching frequency range. The part carries a "Not For New Designs" status, indicating that while it remains available in inventory (45,400 pcs), alternative models from the same series should be evaluated for new development projects. Identifying equivalent substitute parts ensures design flexibility and supply chain continuity for both legacy system maintenance and new applications requiring similar performance characteristics.

Key Parameters

Parameter	Value
Manufacturer	Power Integrations
Series	TOPSwitch®-GX
Package / Case	TO-220-7 Formed Leads, 6 Leads
Supplier Device Package	TO-220-7C
Mounting Type	Through Hole
Topology	Flyback
Output Isolation	Isolated
Voltage - Breakdown	700V
Frequency - Switching	66 kHz ~ 132 kHz
Duty Cycle	66.5%
Fault Protection	Current Limiting, Over Temperature, Over Voltage
Control Features	Frequency Control
Operating Temperature	-40°C ~ 150°C (TJ)
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution within the TOP245YN family is determined by strict adherence to the following invariant parameters:

Fixed Substitution Criteria:

Manufacturer: Power Integrations
Series: TOPSwitch®-GX
Package / Case: TO-220-7 Formed Leads, 6 Leads
Supplier Device Package: TO-220-7C
Mounting Type: Through Hole
Topology: Flyback
Output Isolation: Isolated
Voltage - Breakdown: 700V
Frequency - Switching: 66 kHz ~ 132 kHz
Duty Cycle: 66.5%
Fault Protection: Current Limiting, Over Temperature, Over Voltage
Control Features: Frequency Control
Operating Temperature: -40°C ~ 150°C (TJ)
RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Variable Parameter (Differentiator):

Power (Watts): Ranges from 22 W to 165 W across the substitute family

All substitute parts (TOP242YN, TOP243YN, TOP244YN, TOP246YN, TOP247YN) maintain identical electrical characteristics, protection features, and thermal specifications. The primary distinction is output power rating, which scales linearly within the series. Substitution is valid when the application's power requirement does not exceed the substitute part's rated power output.

Parameter Comparison

Part Number	Power (Watts)	Inventory (Pcs)	Voltage - Breakdown	Frequency - Switching	Operating Temperature	Package
TOP242YN	22 W	3,633	700V	66 kHz ~ 132 kHz	-40°C ~ 150°C (TJ)	TO-220-7C
TOP243YN	45 W	57,300	700V	66 kHz ~ 132 kHz	-40°C ~ 150°C (TJ)	TO-220-7C
TOP244YN	65 W	3,675	700V	66 kHz ~ 132 kHz	-40°C ~ 150°C (TJ)	TO-220-7C
TOP245YN	85 W	45,400	700V	66 kHz ~ 132 kHz	-40°C ~ 150°C (TJ)	TO-220-7C
TOP246YN	125 W	22,534	700V	66 kHz ~ 132 kHz	-40°C ~ 150°C (TJ)	TO-220-7C
TOP247YN	165 W	34,242	700V	66 kHz ~ 132 kHz	-40°C ~ 150°C (TJ)	TO-220-7C

Engineering Selection Recommendations

For Legacy System Maintenance: The TOP245YN remains available with substantial inventory (45,400 pcs). Direct replacement with identical part numbers is the preferred approach for sustaining existing designs.

For Design Flexibility: All substitute parts within the TOP245YN family share identical electrical specifications, protection mechanisms, and thermal operating ranges. Selection among TOP242YN, TOP243YN, TOP244YN, TOP246YN, and TOP247YN depends solely on application power requirements:

TOP242YN (22 W): Low-power isolated converter applications
TOP243YN (45 W): Mid-range power supply designs
TOP244YN (65 W): Moderate-power isolated topologies
TOP245YN (85 W): Standard reference configuration
TOP246YN (125 W): High-power isolated converter systems
TOP247YN (165 W): Maximum-power applications within the series

Compliance Considerations: All parts in this family maintain RoHS compliance and REACH unaffected status. Moisture sensitivity level (MSL 1) indicates unlimited shelf life under standard storage conditions. No additional qualification is required when substituting between parts within this series, provided power rating requirements are satisfied.

Frequently Asked Questions (FAQ)

Q: Can TOP242YN substitute for TOP245YN in an 85 W application?

A: No. TOP242YN is rated for 22 W maximum output power. Using an undersized part results in thermal stress, reduced efficiency, and potential device failure. The substitute part's power rating must equal or exceed the application requirement.

Q: Are all substitute parts pin-compatible with TOP245YN?

A: Yes. All parts in the TOP245YN family use identical TO-220-7C packaging with 6 formed leads. Pin configuration and PCB footprint are identical across the entire substitute range.

Q: What is the difference between TOP245YN and TOP246YN?

A: The primary difference is output power rating: TOP245YN delivers 85 W, while TOP246YN delivers 125 W. All other electrical parameters, switching frequency, protection features, and thermal specifications are identical. TOP246YN is suitable for applications requiring higher power capacity.

Q: Can TOP247YN be used in place of TOP245YN?

A: Yes, provided the application circuit is designed to accommodate the higher power capability. TOP247YN (165 W) is electrically and mechanically compatible with TOP245YN (85 W). The substitute part will operate within specification in any circuit designed for TOP245YN, though it may be oversized for lower-power applications.

Q: Are there any thermal or reliability differences between substitute parts?

A: No. All parts maintain identical operating temperature range (-40°C to 150°C junction temperature), identical fault protection mechanisms (current limiting, over-temperature, over-voltage), and identical moisture sensitivity classification (MSL 1). Thermal performance scales proportionally with power rating but protection architecture remains constant.

Q: What inventory status should influence part selection?

A: TOP243YN offers the highest inventory availability (57,300 pcs), followed by TOP245YN (45,400 pcs) and TOP247YN (34,242 pcs). For supply chain continuity, parts with higher inventory levels provide greater availability assurance. However, inventory should not override power rating requirements.

Q: Is the "Not For New Designs" status a barrier to substitution?

A: The "Not For New Designs" designation indicates that Power Integrations recommends evaluating newer product families for new development. However, for legacy system support and applications where the TOPSwitch®-GX series meets all technical requirements, all parts in this family remain fully functional and supported through their rated operating life.

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