TOP252EG Equivalent & Substitute Parts Reference

Part Overview

The TOP252EG is an offline switch flyback converter IC manufactured by Power Integrations, part of the TOPSwitch®-HX series. This device operates as an isolated power management IC with integrated switching functionality, designed for flyback topology applications at 66kHz and 132kHz switching frequencies. The TOP252EG delivers 21W output power and includes comprehensive fault protection features including current limiting, over-temperature, and over-voltage protection. The part is Active status with RoHS compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical and mechanical parameters allow direct functional replacement within the same package and topology constraints.

Key Parameters

Parameter	Value
Manufacturer	Power Integrations
Series	TOPSwitch®-HX
Category	Power Management (PMIC)
Topology	Flyback
Output Isolation	Isolated
Voltage - Breakdown	700V
Frequency - Switching	66kHz, 132kHz
Duty Cycle	78%
Operating Temperature	-40°C ~ 150°C (TJ)
Package / Case	7-SSIP, 6 Leads, Exposed Pad, Formed Leads
Supplier Device Package	eSIP-7C
Mounting Type	Through Hole
Fault Protection	Current Limiting, Over Temperature, Over Voltage
RoHS Status	RoHS Compliant
MSL Rating	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitute parts for the TOP252EG are identified based on strict parameter equivalence within the TOPSwitch®-HX series. The critical parameters determining substitution eligibility are:

Fixed Parameters (Must Match):

Manufacturer: Power Integrations
Series: TOPSwitch®-HX
Topology: Flyback
Output Isolation: Isolated
Voltage - Breakdown: 700V
Frequency - Switching: 66kHz, 132kHz
Duty Cycle: 78%
Operating Temperature: -40°C ~ 150°C (TJ)
Package / Case: 7-SSIP, 6 Leads, Exposed Pad, Formed Leads
Supplier Device Package: eSIP-7C
Mounting Type: Through Hole
Fault Protection: Current Limiting, Over Temperature, Over Voltage
RoHS Status: RoHS Compliant
MSL Rating: 1 (Unlimited)
REACH Status: REACH Unaffected

Variable Parameter (Determines Power Rating Class):

Power (Watts): Varies by part number

Substitute parts differ only in maximum output power rating. All other electrical, mechanical, and compliance characteristics remain identical. The TOP252EG operates at 21W; substitute parts in this family range from 25W to 238W, allowing selection based on application power requirements while maintaining identical package, topology, and protection characteristics.

Parameter Comparison

Part Number	Manufacturer	Power (Watts)	Topology	Voltage - Breakdown	Frequency - Switching	Package	Operating Temperature	Product Status
TOP252EG	Power Integrations	21 W	Flyback	700V	66kHz, 132kHz	eSIP-7C	-40°C ~ 150°C	Active
TOP253EN	Power Integrations	25 W	Flyback	700V	66kHz, 132kHz	eSIP-7C	-40°C ~ 150°C	Active
TOP254EG	Power Integrations	62 W	Flyback	700V	66kHz, 132kHz	eSIP-7C	-40°C ~ 150°C	Active
TOP254EN	Power Integrations	62 W	Flyback	700V	66kHz, 132kHz	eSIP-7C	-40°C ~ 150°C	Active
TOP255EN	Power Integrations	81 W	Flyback	700V	66kHz, 132kHz	eSIP-7C	-40°C ~ 150°C	Active
TOP256EG	Power Integrations	119 W	Flyback	700V	66kHz, 132kHz	eSIP-7C	-40°C ~ 150°C	Active
TOP256EN	Power Integrations	119 W	Flyback	700V	66kHz, 132kHz	eSIP-7C	-40°C ~ 150°C	Active
TOP257EN	Power Integrations	157 W	Flyback	700V	66kHz, 132kHz	eSIP-7C	-40°C ~ 150°C	Active
TOP258EN	Power Integrations	195 W	Flyback	700V	66kHz, 132kHz	eSIP-7C	-40°C ~ 150°C	Active
TOP259EG	Power Integrations	238 W	Flyback	700V	66kHz, 132kHz	eSIP-7C	-40°C ~ 150°C	Active
TOP259EN	Power Integrations	238 W	Flyback	700V	66kHz, 132kHz	eSIP-7C	-40°C ~ 150°C	Active

Engineering Selection Recommendations

All substitute parts listed maintain Active product status with identical RoHS compliance and REACH unaffected certification. Selection among equivalent parts is determined by application power requirements:

For applications requiring 21W output: TOP252EG is the specified component.

For applications requiring higher power output: Substitute parts provide increased power ratings while maintaining identical electrical characteristics, package configuration, and protection features. The choice between EG and EN suffix variants (where both exist at the same power rating) is based on availability and procurement requirements, as both variants meet identical electrical and mechanical specifications.

For applications with variable power requirements: The TOPSwitch®-HX series allows uprating to higher power variants without redesign of the switching topology, package footprint, or thermal management approach, provided the application circuit topology remains compatible with the higher power rating.

All parts are RoHS Compliant with MSL 1 rating, suitable for standard PCB assembly processes without moisture bake requirements.

Frequently Asked Questions (FAQ)

Q: Can TOP252EG be directly replaced with TOP254EG on an existing PCB?

A: Yes. Both parts share identical package configuration (eSIP-7C, 7-SSIP with 6 leads and exposed pad), pinout, mounting type (through hole), and electrical characteristics including topology, breakdown voltage, switching frequency, duty cycle, and operating temperature range. The primary difference is output power rating (21W vs. 62W). Direct PCB substitution is mechanically and electrically compatible.

Q: What is the difference between TOP254EG and TOP254EN?

A: Both variants deliver identical 62W output power and share all electrical and mechanical specifications. The suffix designates packaging or distribution channel variants. Both are Active status with equivalent compliance certifications. Selection between variants is based on availability and supplier inventory.

Q: Are all substitute parts in the same package?

A: Yes. All listed substitute parts use the eSIP-7C package (7-SSIP, 6 leads, exposed pad, formed leads) with through-hole mounting. Package footprint and pinout are identical across the entire TOPSwitch®-HX series listed.

Q: Can a lower power part substitute for a higher power application?

A: No. Substitution with lower power variants is not supported. The TOP252EG (21W) cannot replace higher power variants. Conversely, higher power variants can be used in applications designed for lower power, provided circuit design accommodates the increased power capability.

Q: Do all parts operate at the same switching frequency?

A: Yes. All substitute parts operate at 66kHz and 132kHz switching frequencies with 78% duty cycle. Frequency selection is determined by application circuit design, not part selection.

Q: Are there compliance differences between substitute parts?

A: No. All parts maintain identical RoHS compliance status, REACH unaffected designation, MSL 1 rating, and fault protection features (current limiting, over-temperature, over-voltage). Compliance and reliability characteristics are uniform across the series.

**Q: What determines the choice between different power ratings in the TOPSwitch®-HX series

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