TOP255EG Equivalent & Substitute Parts Reference

Part Overview

The TOP255EG is an offline switch flyback converter IC from Power Integrations' TOPSwitch®-HX series, designed for isolated power supply applications. This component operates at 66kHz or 132kHz switching frequency with a maximum power rating of 81W and features integrated current limiting, over-temperature, and over-voltage protection. The part is Active status with full RoHS compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are necessary when the TOP255EG becomes unavailable, when alternative packaging variants are required, or when application power requirements differ from the 81W specification while maintaining compatibility with the same topology, voltage ratings, and protection features.

Key Parameters

Parameter	Value
Manufacturer	Power Integrations
Series	TOPSwitch®-HX
Topology	Flyback
Output Isolation	Isolated
Voltage - Breakdown	700V
Frequency - Switching	66kHz, 132kHz
Duty Cycle	78%
Power (Watts)	81W
Fault Protection	Current Limiting, Over Temperature, Over Voltage
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
RoHS Status	RoHS Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the TOP255EG is determined by strict adherence to the following parameters:

Critical Matching Parameters:

Manufacturer: Power Integrations
Series: TOPSwitch®-HX
Topology: Flyback
Output Isolation: Isolated
Voltage - Breakdown: 700V
Frequency - Switching: 66kHz, 132kHz
Duty Cycle: 78%
Fault Protection: Current Limiting, Over Temperature, Over Voltage
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
RoHS Status: RoHS Compliant
MSL Rating: 1 (Unlimited)

Variable Parameter (Allows Substitution):

Power (Watts): The power rating may differ between substitute parts. Selection depends on application requirements and thermal design considerations.

All substitute parts listed maintain identical electrical characteristics, protection features, switching topology, and thermal operating range. The primary differentiation among substitute parts is the maximum power output capability.

Parameter Comparison

Part Number	Manufacturer	Series	Topology	Voltage Breakdown	Switching Frequency	Power (W)	Fault Protection	Operating Temp	Package	RoHS	Inventory (Pcs)
TOP255EG	Power Integrations	TOPSwitch®-HX	Flyback	700V	66kHz, 132kHz	81	Current Limiting, Over Temp, Over Voltage	-40°C ~ 150°C	eSIP-7C	Compliant	8000
TOP253EN	Power Integrations	TOPSwitch®-HX	Flyback	700V	66kHz, 132kHz	25	Current Limiting, Over Temp, Over Voltage	-40°C ~ 150°C	eSIP-7C	Compliant	1177
TOP254EG	Power Integrations	TOPSwitch®-HX	Flyback	700V	66kHz, 132kHz	62	Current Limiting, Over Temp, Over Voltage	-40°C ~ 150°C	eSIP-7C	Compliant	16400
TOP254EN	Power Integrations	TOPSwitch®-HX	Flyback	700V	66kHz, 132kHz	62	Current Limiting, Over Temp, Over Voltage	-40°C ~ 150°C	eSIP-7C	Compliant	3834
TOP255EN	Power Integrations	TOPSwitch®-HX	Flyback	700V	66kHz, 132kHz	81	Current Limiting, Over Temp, Over Voltage	-40°C ~ 150°C	eSIP-7C	Compliant	10037
TOP256EG	Power Integrations	TOPSwitch®-HX	Flyback	700V	66kHz, 132kHz	119	Current Limiting, Over Temp, Over Voltage	-40°C ~ 150°C	eSIP-7C	Compliant	1266
TOP256EN	Power Integrations	TOPSwitch®-HX	Flyback	700V	66kHz, 132kHz	119	Current Limiting, Over Temp, Over Voltage	-40°C ~ 150°C	eSIP-7C	Compliant	27159
TOP257EN	Power Integrations	TOPSwitch®-HX	Flyback	700V	66kHz, 132kHz	157	Current Limiting, Over Temp, Over Voltage	-40°C ~ 150°C	eSIP-7C	Compliant	1436
TOP258EN	Power Integrations	TOPSwitch®-HX	Flyback	700V	66kHz, 132kHz	195	Current Limiting, Over Temp, Over Voltage	-40°C ~ 150°C	eSIP-7C	Compliant	16620
TOP259EG	Power Integrations	TOPSwitch®-HX	Flyback	700V	66kHz, 132kHz	238	Current Limiting, Over Temp, Over Voltage	-40°C ~ 150°C	eSIP-7C	Compliant	9200
TOP259EN	Power Integrations	TOPSwitch®-HX	Flyback	700V	66kHz, 132kHz	238	Current Limiting, Over Temp, Over Voltage	-40°C ~ 150°C	eSIP-7C	Compliant	10100

Engineering Selection Recommendations

Direct Equivalent (Identical Power Rating): TOP255EN is the direct equivalent to TOP255EG, maintaining the same 81W power specification. Both parts are Active status with full RoHS compliance and identical electrical characteristics. Selection between TOP255EG and TOP255EN depends on packaging variant availability and inventory requirements.

Lower Power Alternatives: TOP254EG and TOP254EN (62W) are suitable for applications requiring reduced power output compared to the 81W specification. These parts maintain all electrical and thermal characteristics of the TOP255EG series.

TOP253EN (25W) is available for low-power applications within the same topology and protection framework.

Higher Power Alternatives: TOP256EG and TOP256EN (119W), TOP257EN (157W), TOP258EN (195W), and TOP259EG/TOP259EN (238W) provide increased power capacity while maintaining identical electrical topology, voltage ratings, switching frequency, and protection features.

All substitute parts carry Active product status, RoHS compliance, and MSL 1 rating, ensuring compatibility with current manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can TOP255EN be used as a direct replacement for TOP255EG? A: Yes. TOP255EN and TOP255EG are parametrically equivalent with identical 81W power rating, 700V breakdown voltage, 66kHz/132kHz switching frequency, and eSIP-7C package. Both are Active status with RoHS compliance.

Q: What is the primary difference between substitute parts in this list? A: The maximum power output rating varies across the substitute series. All other electrical parameters, topology, voltage ratings, switching frequency, duty cycle, fault protection, operating temperature range, and package specifications remain constant across all listed parts.

Q: Can I use TOP256EN (119W) in place of TOP255EG (81W)? A: TOP256EN is electrically compatible with TOP255EG in terms of topology, voltage, frequency, and protection features. The higher power rating indicates greater current handling capability. Application suitability depends on circuit design and thermal management requirements.

Q: Can I use TOP254EG (62W) in place of TOP255EG (81W)? A: TOP254EG maintains identical electrical characteristics and protection features as TOP255EG. The lower power rating indicates reduced maximum current handling. This substitution is valid only if the application power requirement does not exceed 62W.

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, ensuring mechanical and electrical compatibility.

Q: What is the operating temperature range for all substitute parts? A: All substitute parts operate across -40°C to 150°C junction temperature (TJ), identical to the TOP255EG specification.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts carry RoHS Compliant status and MSL 1 (Unlimited) moisture sensitivity rating.

Q: What protection features are included in all substitute parts? A: All substitute parts include Current Limiting, Over Temperature, and Over Voltage protection, identical to the TOP255EG.

Q: What is the switching frequency specification for substitute parts? A: All substitute parts operate at 66kHz or 132kHz switching frequency with 78% duty cycle, matching the TOP255EG specification.

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