TOP252EN Equivalent & Substitute Parts Reference

Part Overview

The TOP252EN is an offline switch flyback converter IC manufactured by Power Integrations, part of the TOPSwitch®-HX series. This isolated power management IC operates at 66kHz or 132kHz switching frequency with a 21W power rating and 700V breakdown voltage. The device integrates current limiting, over-temperature, and over-voltage fault protection, making it suitable for isolated flyback topology power supply applications.

The TOP252EN is an active product with full RoHS compliance and unlimited moisture sensitivity rating (MSL 1). Finding equivalent substitute parts becomes necessary when the original part reaches end-of-life status, inventory constraints occur, or design requirements demand higher power output capabilities within the same package and topology family.

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%
Power (Watts)	21 W
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)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the TOP252EN are selected from the TOPSwitch®-HX family based on strict parameter alignment. All substitute candidates share the following critical parameters with the TOP252EN:

Common Parameters (Substitution Criteria):

Manufacturer: Power Integrations
Series: TOPSwitch®-HX
Topology: Flyback
Output Isolation: Isolated
Voltage - Breakdown: 700V
Switching Frequency: 66kHz, 132kHz
Duty Cycle: 78%
Fault Protection: Current Limiting, Over Temperature, Over Voltage
Operating Temperature Range: -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)
Product Status: Active

Variable Parameter (Power Rating): The primary differentiator among substitute parts is the Power (Watts) rating. Substitute parts are grouped by power output capability, allowing selection based on application requirements while maintaining full electrical and mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Power (Watts)	Voltage - Breakdown	Frequency - Switching	Duty Cycle	Package	Mounting Type	Product Status	Inventory (Pcs)
TOP252EN	Power Integrations	21 W	700V	66kHz, 132kHz	78%	7-SSIP eSIP-7C	Through Hole	Active	5100
TOP253EN	Power Integrations	25 W	700V	66kHz, 132kHz	78%	7-SSIP eSIP-7C	Through Hole	Active	1177
TOP254EG	Power Integrations	62 W	700V	66kHz, 132kHz	78%	7-SSIP eSIP-7C	Through Hole	Active	16400
TOP254EN	Power Integrations	62 W	700V	66kHz, 132kHz	78%	7-SSIP eSIP-7C	Through Hole	Active	3834
TOP255EN	Power Integrations	81 W	700V	66kHz, 132kHz	78%	7-SSIP eSIP-7C	Through Hole	Active	10037
TOP256EG	Power Integrations	119 W	700V	66kHz, 132kHz	78%	7-SSIP eSIP-7C	Through Hole	Active	1266
TOP256EN	Power Integrations	119 W	700V	66kHz, 132kHz	78%	7-SSIP eSIP-7C	Through Hole	Active	27159
TOP257EN	Power Integrations	157 W	700V	66kHz, 132kHz	78%	7-SSIP eSIP-7C	Through Hole	Active	1436
TOP258EN	Power Integrations	195 W	700V	66kHz, 132kHz	78%	7-SSIP eSIP-7C	Through Hole	Active	16620
TOP259EG	Power Integrations	238 W	700V	66kHz, 132kHz	78%	7-SSIP eSIP-7C	Through Hole	Active	9200
TOP259EN	Power Integrations	238 W	700V	66kHz, 132kHz	78%	7-SSIP eSIP-7C	Through Hole	Active	10100

Engineering Selection Recommendations

All listed substitute parts maintain full compatibility with TOP252EN designs at the electrical and mechanical interface level. Selection among substitute parts depends on application power requirements:

For Direct Replacement (21W Applications): TOP252EN is the specified part. If unavailable, TOP253EN provides the next power tier (25W) with identical electrical characteristics and package specifications.

For Higher Power Capability: Applications requiring power output exceeding 21W can select from the higher-rated alternatives. The TOP254EN and TOP254EG both provide 62W capability in the same package. TOP256EN offers 119W with the highest inventory availability (27,159 pcs). TOP258EN and TOP259EN/EG provide maximum power ratings up to 238W.

Compliance and Certification: All substitute parts carry identical compliance certifications: RoHS Compliant, REACH Unaffected, MSL 1 (Unlimited), and ECCN EAR99. All parts maintain Active product status with full manufacturer support.

Inventory Considerations: TOP256EN demonstrates the highest stock availability (27,159 pcs), followed by TOP254EG (16,400 pcs) and TOP258EN (16,620 pcs). These parts offer supply chain reliability for high-volume applications.

Frequently Asked Questions (FAQ)

Q: Can TOP253EN directly replace TOP252EN in existing designs?

A: TOP253EN shares all electrical and mechanical parameters with TOP252EN except power rating (25W vs. 21W). Both use identical 7-SSIP eSIP-7C packages, 700V breakdown voltage, 66kHz/132kHz switching frequency, and 78% duty cycle. Direct PCB substitution is mechanically and electrically compatible. Design verification for the higher power rating is required.

Q: What is the primary difference between TOP254EG and TOP254EN?

A: Both parts are identical in all electrical and mechanical specifications, including 62W power rating, 700V breakdown voltage, and eSIP-7C package. The difference lies in packaging designation (EG vs. EN suffix) and inventory levels. TOP254EG has 16,400 pcs available versus 3,834 pcs for TOP254EN.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts carry RoHS Compliant status, REACH Unaffected designation, and MSL 1 (Unlimited) moisture sensitivity rating, matching TOP252EN compliance certifications.

Q: Can a higher-power substitute part be used in a 21W application?

A: All substitute parts maintain identical electrical interface parameters (700V breakdown, 66kHz/132kHz switching, 78% duty cycle, isolated topology). Higher-power variants can operate in lower-power applications. Design thermal management and PCB layout must accommodate the selected part's specifications.

Q: What package type do all substitute parts use?

A: All substitute parts use 7-SSIP package with 6 leads, exposed pad, and formed leads in the eSIP-7C supplier designation. All are through-hole mounted components with identical footprint compatibility.

Q: Is TOP252EN still in active production?

A: TOP252EN maintains Active product status with 5,100 pcs in current inventory. All listed substitute parts are also Active products with full manufacturer support and availability.

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