TOP255PG Equivalent & Substitute Parts Reference

Part Overview

The TOP255PG is an offline switch flyback converter IC from Power Integrations' TOPSwitch®-HX series, designed for isolated power supply applications. This component operates at 66 kHz switching frequency with 30 W power output capability and integrates internal current limiting, over-temperature, and over-voltage protection. The TOP255PG is classified as obsolete; however, functionally equivalent and parametrically compatible alternatives are available in active product status, making substitution necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer	Power Integrations
Series	TOPSwitch®-HX
Topology	Flyback
Output Isolation	Isolated
Voltage - Breakdown	700V
Frequency - Switching	66 kHz
Duty Cycle	78%
Power (Watts)	30 W
Fault Protection	Current Limiting, Over Temperature, Over Voltage
Operating Temperature	-40°C ~ 150°C (TJ)
Package / Case	8-DIP (0.300", 7.62mm), 7 Leads
Mounting Type	Through Hole
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the TOP255PG is determined by the following critical parameters:

Primary Substitution Criteria:

Manufacturer: Power Integrations
Series: TOPSwitch®-HX
Topology: Flyback
Output Isolation: Isolated
Voltage - Breakdown: 700V
Frequency - Switching: 66 kHz
Duty Cycle: 78%
Package / Case: 8-DIP (0.300", 7.62mm), 7 Leads
Supplier Device Package: 8-PDIP-C
Mounting Type: Through Hole
Operating Temperature Range: -40°C ~ 150°C (TJ)
Fault Protection: Current Limiting, Over Temperature, Over Voltage
RoHS Status: RoHS Compliant
MSL: 1 (Unlimited)

Variable Parameter (Allows Substitution):

Power (Watts): Substitutes may range from 15 W to 41 W depending on application requirements

Packaging Variants:

Tube packaging (PN suffix) represents active product status alternatives to tape/reel or unspecified packaging (PG suffix)

All substitute parts listed maintain identical electrical characteristics, thermal specifications, protection features, and compliance certifications as the TOP255PG, with the exception of power output rating, which may be selected based on specific application power requirements.

Parameter Comparison

Part Number	Manufacturer	Product Status	Power (W)	Voltage Breakdown (V)	Frequency (kHz)	Package	Inventory (Pcs)
TOP255PG	Power Integrations	Obsolete	30	700	66	8-DIP	756
TOP255PN	Power Integrations	Active	30	700	66	8-DIP	5619
TOP252PG	Power Integrations	Active	15	700	66	8-DIP	968
TOP252PN	Power Integrations	Active	15	700	66	8-DIP	16771
TOP253PG	Power Integrations	Active	25	700	66	8-DIP	1025
TOP253PN	Power Integrations	Active	25	700	66	8-DIP	35300
TOP254PG	Power Integrations	Active	28	700	66	8-DIP	842
TOP254PN	Power Integrations	Active	28	700	66	8-DIP	20300
TOP256PN	Power Integrations	Active	34	700	66	8-DIP	19116
TOP257PG	Power Integrations	Active	41	700	66	8-DIP	1057
TOP257PN	Power Integrations	Active	41	700	66	8-DIP	1308

Engineering Selection Recommendations

Direct Replacement (Identical Power Rating): TOP255PN is the primary substitute for TOP255PG. Both components deliver 30 W output power with identical electrical and thermal specifications. TOP255PN carries active product status and is available in tube packaging, ensuring long-term supply continuity and compliance with current manufacturing standards.

Power-Scaled Alternatives: For applications where power output requirements differ from the original 30 W specification, the following active alternatives are available within the TOPSwitch®-HX 700V, 66 kHz family:

TOP252PN/TOP252PG: 15 W output (power reduction)
TOP253PN/TOP253PG: 25 W output (power reduction)
TOP254PN/TOP254PG: 28 W output (power reduction)
TOP256PN: 34 W output (power increase)
TOP257PN/TOP257PG: 41 W output (power increase)

All alternatives maintain identical topology, isolation, voltage rating, switching frequency, duty cycle, protection features, operating temperature range, package configuration, and compliance certifications. Selection among these alternatives depends solely on the required power output for the specific application.

Packaging Considerations: PN-suffix variants (tube packaging) are preferred for new designs due to active product status and higher inventory availability. PG-suffix variants remain available but represent legacy packaging configurations.

Compliance and Certification: All substitute parts are RoHS Compliant, REACH Unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original TOP255PG specifications.

Frequently Asked Questions (FAQ)

Q: Can TOP255PN directly replace TOP255PG without circuit modifications?

A: Yes. TOP255PN is the direct functional equivalent of TOP255PG. Both components share identical electrical characteristics, thermal specifications, protection features, package configuration, and pin assignments. No circuit modifications are required for substitution.

Q: What is the difference between TOP255PG and TOP255PN?

A: The primary difference is product status and packaging format. TOP255PG is obsolete with unspecified packaging, while TOP255PN is active with tube packaging. Electrical and thermal performance are identical. TOP255PN is recommended for new designs and production orders.

Q: Can I use TOP252PN or TOP253PN instead of TOP255PN in my design?

A: Substitution depends on your application's power requirements. TOP252PN delivers 15 W, TOP253PN delivers 25 W, and TOP255PN delivers 30 W. If your design requires exactly 30 W output, use TOP255PN. If your application can operate at lower power levels, TOP252PN or TOP253PN are electrically compatible alternatives. All three maintain identical topology, frequency, voltage rating, and protection features.

Q: Are TOP256PN and TOP257PN compatible with TOP255PG designs?

A: TOP256PN (34 W) and TOP257PN (41 W) are electrically compatible with TOP255PG in terms of topology, frequency, voltage rating, and protection features. However, these components deliver higher power output. Use these alternatives only if your application requires increased power capacity. Verify that your transformer and output stage can accommodate the higher power rating.

Q: What does the PN and PG suffix indicate?

A: The suffix indicates packaging format. PN denotes tube packaging (active product status), while PG denotes an alternative packaging configuration (legacy or unspecified). For new designs and production, PN-suffix variants are preferred due to active product status and superior inventory availability.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed—TOP252PN, TOP252PG, TOP253PN, TOP253PG, TOP254PN, TOP254PG, TOP256PN, TOP257PN, and TOP257PG—are RoHS Compliant and REACH Unaffected, matching the compliance status of the original TOP255PG.

Q: What is the operating temperature range for substitute parts?

A: All substitute parts operate across the identical temperature range: -40°C to 150°C (junction temperature). This matches the TOP255PG specification and ensures thermal compatibility in all application environments.

Q: Which substitute part has the highest inventory availability?

A: TOP253PN has the highest inventory with 35,300 pieces in stock, followed by TOP254PN with 20,300 pieces. TOP255PN, the direct equivalent, has 5,619 pieces available. Inventory levels should be verified with your supplier for current availability.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message