TOP261LN Equivalent & Substitute Parts Reference

Part Overview

The TOP261LN is an offline flyback converter IC from Power Integrations' TOPSwitch®-HX series, designed for isolated power supply applications. This component integrates a high-voltage switch with comprehensive fault protection in a 7-lead eSIP package. The TOP261LN is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. Substitute parts within the TOPSwitch®-HX family maintain electrical compatibility while offering active product status and continued manufacturer support.

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)	244 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-7F
Mounting Type	Through Hole
RoHS Status	RoHS Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution within the TOPSwitch®-HX family is determined by the following criteria:

Electrical Compatibility Parameters:

Voltage breakdown rating (700V maintained across all substitutes)
Topology (Flyback maintained across all substitutes)
Output isolation (Isolated maintained across all substitutes)
Switching frequency (66kHz, 132kHz maintained across all substitutes)
Duty cycle (78% maintained across all substitutes)
Fault protection features (Current Limiting, Over Temperature, Over Voltage maintained across all substitutes)
Operating temperature range (-40°C ~ 150°C maintained across all substitutes)

Mechanical Compatibility Parameters:

Package type (7-SSIP, 6 Leads, Exposed Pad, Formed Leads maintained across all substitutes)
Mounting type (Through Hole maintained across all substitutes)
MSL rating (1 - Unlimited maintained across all substitutes)

Variable Parameter:

Power rating (Watts) - varies by part number within the series

Substitute parts differ primarily in power handling capacity. The TOP261LN operates at 244W. Substitutes are available in lower power ratings (21W to 119W) within the same electrical and mechanical framework. Selection of a substitute requires matching or exceeding the power requirement of the target application.

Parameter Comparison

Part Number	Manufacturer	Power (W)	Voltage Breakdown	Topology	Switching Frequency	Duty Cycle	Package	Supplier Package	Product Status	Inventory (Pcs)
TOP261LN	Power Integrations	244	700V	Flyback	66kHz, 132kHz	78%	7-SSIP	eSIP-7F	Obsolete	1301
TOP252EG	Power Integrations	21	700V	Flyback	66kHz, 132kHz	78%	7-SSIP	eSIP-7C	Active	696
TOP252EN	Power Integrations	21	700V	Flyback	66kHz, 132kHz	78%	7-SSIP	eSIP-7C	Active	5100
TOP253EG	Power Integrations	43	700V	Flyback	66kHz, 132kHz	78%	7-SSIP	eSIP-7C	Active	677
TOP253EN	Power Integrations	25	700V	Flyback	66kHz, 132kHz	78%	7-SSIP	eSIP-7C	Active	1177
TOP254EG	Power Integrations	62	700V	Flyback	66kHz, 132kHz	78%	7-SSIP	eSIP-7C	Active	16400
TOP254EN	Power Integrations	62	700V	Flyback	66kHz, 132kHz	78%	7-SSIP	eSIP-7C	Active	3834
TOP255EG	Power Integrations	81	700V	Flyback	66kHz, 132kHz	78%	7-SSIP	eSIP-7C	Active	8000
TOP255EN	Power Integrations	81	700V	Flyback	66kHz, 132kHz	78%	7-SSIP	eSIP-7C	Active	10037
TOP256EG	Power Integrations	119	700V	Flyback	66kHz, 132kHz	78%	7-SSIP	eSIP-7C	Active	1266
TOP256EN	Power Integrations	119	700V	Flyback	66kHz, 132kHz	78%	7-SSIP	eSIP-7C	Active	27159

Engineering Selection Recommendations

Product Status Consideration: The TOP261LN is classified as obsolete. All listed substitute parts maintain active product status with Power Integrations, ensuring continued availability, technical support, and manufacturing consistency.

Compliance and Certifications: All substitute parts maintain identical compliance profiles to the TOP261LN:

RoHS Compliant
REACH Unaffected
ECCN: EAR99
HTSUS: 8542.39.0001
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Power Rating Limitation: The TOP261LN operates at 244W. No substitute part in the provided list matches or exceeds this power rating. The highest-rated substitute parts (TOP256EG and TOP256EN) operate at 119W, representing approximately 49% of the original part's power capacity. Selection of a substitute requires application redesign or confirmation that the target application power requirement does not exceed 119W.

Package Consideration: The TOP261LN uses eSIP-7F packaging. Substitute parts use eSIP-7C packaging. Both maintain 7-SSIP, 6 Leads, Exposed Pad, Formed Leads mechanical configuration and Through Hole mounting. Physical footprint differences between eSIP-7F and eSIP-7C require PCB layout verification.

Inventory Availability: TOP256EN offers the highest inventory level (27,159 pcs) among active substitutes, followed by TOP254EG (16,400 pcs) and TOP255EN (10,037 pcs).

Frequently Asked Questions (FAQ)

Q: Can TOP256EN directly replace TOP261LN in existing designs?

A: TOP256EN shares all electrical parameters (700V breakdown, 66kHz/132kHz switching, 78% duty cycle, isolated topology, identical fault protection) and mechanical parameters (7-SSIP package, Through Hole mounting, identical MSL rating). However, TOP256EN operates at 119W versus TOP261LN's 244W. Direct replacement is only valid if the application power requirement does not exceed 119W. Additionally, eSIP-7C packaging (TOP256EN) differs from eSIP-7F packaging (TOP261LN), requiring PCB layout verification.

Q: What is the difference between TOP254EG and TOP254EN?

A: Both parts are identical in electrical specifications (62W power rating, 700V breakdown, 66kHz/132kHz switching, 78% duty cycle, isolated flyback topology, identical fault protection, -40°C to 150°C operating range) and mechanical specifications (7-SSIP package, eSIP-7C supplier package, Through Hole mounting). The difference is in packaging format: EG denotes tube packaging, while EN denotes tube packaging. Both maintain RoHS compliance and identical compliance certifications.

Q: Why does TOP261LN have eSIP-7F packaging while substitutes use eSIP-7C?

A: eSIP-7F and eSIP-7C are distinct package variants within the 7-SSIP family. Both maintain 6 leads, exposed pad, and formed leads configuration with Through Hole mounting. The packaging designation reflects internal construction differences. PCB layout and thermal management design must account for these package-specific characteristics.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (TOP252EG, TOP252EN, TOP253EG, TOP253EN, TOP254EG, TOP254EN, TOP255EG, TOP255EN, TOP256EG, TOP256EN) maintain RoHS Compliant status identical to TOP261LN. All parts are REACH Unaffected with EAR99 ECCN classification and MSL rating of 1 (Unlimited).

Q: Which substitute part offers the best inventory availability?

A: TOP256EN offers 27,159 pcs in stock, the highest inventory level among all active substitutes. TOP254EG follows with 16,400 pcs, and TOP255EN with 10,037 pcs.

Q: Can I use a lower-power substitute if my application requires less than 244W?

A: Yes, provided the selected substitute's power rating meets or exceeds your application's actual power requirement. For example, if your application requires 100W, TOP256EN (119W) or TOP256EG (119W) are suitable. If your application requires 60W, TOP254EG or TOP254EN (62W each) are suitable. Power rating selection must not be below the application requirement.

Q: What fault protection features are maintained across all substitute parts?

A: All substitute parts maintain identical fault protection: Current Limiting, Over Temperature, and Over Voltage protection. These features are consistent across the entire TOPSwitch®-HX family listed.

Q: Is the operating temperature range identical across all parts?

A: Yes. All parts, including TOP261LN and all substitutes, operate across -40°C to 150°C junction temperature (TJ) range.

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