TOP254PG Equivalent & Substitute Parts Reference

Part Overview

The TOP254PG is an offline switch flyback converter IC from Power Integrations' TOPSwitch®-HX series, designed for isolated power supply applications. This 8-DIP through-hole component operates at 66 kHz switching frequency with 28 W output power capability and integrated current limiting, over-temperature, and over-voltage protection. The part is Active status with full RoHS compliance and unlimited moisture sensitivity rating. Substitute parts are identified within the TOPSwitch®-HX family to address application requirements for different power levels, inventory availability, or packaging variants while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	TOP254PG
Manufacturer	Power Integrations
Series	TOPSwitch®-HX
Category	Power Management (PMIC)
Topology	Flyback
Output Isolation	Isolated
Voltage - Breakdown	700V
Frequency - Switching	66 kHz
Power (Watts)	28 W
Duty Cycle	78%
Fault Protection	Current Limiting, Over Temperature, Over Voltage
Package / Case	8-DIP (0.300", 7.62mm), 7 Leads
Mounting Type	Through Hole
Operating Temperature	-40°C ~ 150°C (TJ)
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for TOP254PG are selected from the TOPSwitch®-HX series based on strict parameter matching. All substitute candidates share identical electrical and mechanical specifications with the main part in the following critical areas:

Matching Parameters (Substitution Basis):

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

Variable Parameter (Differentiator):

Power (Watts): Ranges from 15 W to 48 W across the substitute family

Substitution is valid when the selected part's power rating meets or exceeds the application requirement. All substitute parts maintain identical package footprint, pinout compatibility, thermal characteristics, and protection features.

Parameter Comparison

Part Number	Manufacturer	Power (W)	Voltage Breakdown (V)	Switching Frequency (kHz)	Duty Cycle (%)	Package	Operating Temp (°C)	Inventory (Pcs)
TOP254PG	Power Integrations	28	700	66	78	8-DIP	-40 ~ 150	842
TOP252PN	Power Integrations	15	700	66	78	8-DIP	-40 ~ 150	16771
TOP253PN	Power Integrations	25	700	66	78	8-DIP	-40 ~ 150	35300
TOP254PN	Power Integrations	28	700	66	78	8-DIP	-40 ~ 150	20300
TOP255PN	Power Integrations	30	700	66	78	8-DIP	-40 ~ 150	5619
TOP256PN	Power Integrations	34	700	66	78	8-DIP	-40 ~ 150	19116
TOP257PN	Power Integrations	41	700	66	78	8-DIP	-40 ~ 150	1308
TOP258PN	Power Integrations	48	700	66	78	8-DIP	-40 ~ 150	25300

Engineering Selection Recommendations

Selection of substitute parts for TOP254PG applications is determined by power requirement matching and product availability:

Direct Equivalent (Same Power Rating): TOP254PN provides identical 28 W power specification with matching electrical and mechanical characteristics. This part is suitable for direct replacement with higher inventory availability (20,300 pcs vs. 842 pcs for TOP254PG).

Lower Power Applications: TOP252PN (15 W) and TOP253PN (25 W) are suitable for applications requiring reduced power output. These parts maintain all electrical parameters and package compatibility. TOP253PN offers the closest power match below the 28 W specification.

Higher Power Applications: TOP255PN (30 W), TOP256PN (34 W), TOP257PN (41 W), and TOP258PN (48 W) accommodate applications requiring power output exceeding 28 W. All maintain identical electrical characteristics and 8-DIP package footprint.

Compliance and Certification: All substitute parts carry Active product status, RoHS compliance, and MSL Level 1 rating, matching the regulatory and environmental requirements of TOP254PG. REACH unaffected status is consistent across the family.

Inventory Considerations: TOP253PN (35,300 pcs), TOP258PN (25,300 pcs), and TOP254PN (20,300 pcs) offer superior stock availability for supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can TOP254PN replace TOP254PG directly? A: Yes. TOP254PN provides identical 28 W power output, 700V breakdown voltage, 66 kHz switching frequency, and 8-DIP package configuration. Both parts are Active status with RoHS compliance and MSL Level 1 rating. The PN packaging variant is compatible with the PG variant in through-hole applications.

Q: What is the difference between TOP254PG and TOP254PN? A: The primary difference is the packaging designation (PG vs. PN). Both parts share identical electrical specifications and performance characteristics. The substitution is valid for through-hole PCB assembly applications.

Q: Can I use TOP253PN in place of TOP254PG? A: TOP253PN is suitable only if your application power requirement is 25 W or less. The part shares all electrical parameters (700V breakdown, 66 kHz switching, 78% duty cycle) and package footprint with TOP254PG. If your design requires 28 W output, TOP253PN will not meet power specifications.

Q: Are all substitute parts in the same package? A: Yes. All substitute parts in this reference use the 8-DIP (0.300", 7.62mm) through-hole package with 7 leads. PCB footprint and pinout are identical across the entire TOPSwitch®-HX family listed here.

Q: What determines whether a substitute part is compatible? A: Compatibility is determined by: (1) matching topology (Flyback), (2) matching isolation (Isolated), (3) matching voltage rating (700V breakdown), (4) matching switching frequency (66 kHz), (5) matching package (8-DIP), (6) matching mounting type (Through Hole), and (7) power rating equal to or greater than the application requirement.

Q: Can I use TOP258PN (48 W) in a 28 W application? A: Yes. TOP258PN provides higher power capability while maintaining all other electrical and mechanical parameters identical to TOP254PG. The higher power rating does not create incompatibility; the part will operate within the 28 W application envelope.

Q: Are all these parts RoHS compliant? A: Yes. All substitute parts carry RoHS Compliant status and MSL Level 1 (Unlimited) moisture sensitivity rating, matching TOP254PG compliance requirements.

Q: What is the operating temperature range for these parts? A: All parts operate from -40°C to 150°C junction temperature (TJ), providing identical thermal performance across the substitute family.

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