TOP259LN Equivalent & Substitute Parts

Part Overview

The TOP259LN is an offline flyback converter IC manufactured by Power Integrations, part of the TOPSwitch®-HX series. This component integrates a high-voltage power switch with control circuitry for isolated flyback topology power supplies operating at 66kHz or 132kHz switching frequencies. The TOP259LN is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage ratings, topology, switching frequency, fault protection features, and thermal operating range while accommodating packaging and power output variations.

Key Parameters

Parameter	TOP259LN
Manufacturer	Power Integrations
Series	TOPSwitch®-HX
Product Status	Obsolete
Topology	Flyback
Output Isolation	Isolated
Voltage - Breakdown	700V
Frequency - Switching	66kHz, 132kHz
Duty Cycle	78%
Power (Watts)	162 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
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the TOP259LN is determined by strict adherence to the following electrical and mechanical parameters:

Core Compatibility Criteria:

Manufacturer: Power Integrations (same family)
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
Mounting Type: Through Hole
RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)
REACH Status: REACH Unaffected

Variable Parameter (Power Output): The power rating in watts varies across substitute parts. The TOP259LN operates at 162 W. Substitute parts are grouped by power output capability, ranging from 21 W to 119 W. Selection of a substitute must account for the specific power requirement of the target application.

Package Variation: The TOP259LN uses eSIP-7F packaging. Substitute parts employ eSIP-7C packaging. Both are 7-SSIP configurations with 6 leads, exposed pad, and formed leads, maintaining through-hole mounting compatibility.

Product Status: All identified substitute parts maintain Active product status, ensuring ongoing availability and support, in contrast to the obsolete TOP259LN.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Topology	Voltage - Breakdown	Frequency - Switching	Duty Cycle	Power (Watts)	Fault Protection	Operating Temperature	Package	Mounting Type	RoHS Status
TOP259LN	Power Integrations	TOPSwitch®-HX	Obsolete	Flyback	700V	66kHz, 132kHz	78%	162 W	Current Limiting, Over Temperature, Over Voltage	-40°C ~ 150°C	7-SSIP eSIP-7F	Through Hole	RoHS Compliant
TOP252EG	Power Integrations	TOPSwitch®-HX	Active	Flyback	700V	66kHz, 132kHz	78%	21 W	Current Limiting, Over Temperature, Over Voltage	-40°C ~ 150°C	7-SSIP eSIP-7C	Through Hole	RoHS Compliant
TOP252EN	Power Integrations	TOPSwitch®-HX	Active	Flyback	700V	66kHz, 132kHz	78%	21 W	Current Limiting, Over Temperature, Over Voltage	-40°C ~ 150°C	7-SSIP eSIP-7C	Through Hole	RoHS Compliant
TOP253EG	Power Integrations	TOPSwitch®-HX	Active	Flyback	700V	66kHz, 132kHz	78%	43 W	Current Limiting, Over Temperature, Over Voltage	-40°C ~ 150°C	7-SSIP eSIP-7C	Through Hole	RoHS Compliant
TOP253EN	Power Integrations	TOPSwitch®-HX	Active	Flyback	700V	66kHz, 132kHz	78%	25 W	Current Limiting, Over Temperature, Over Voltage	-40°C ~ 150°C	7-SSIP eSIP-7C	Through Hole	RoHS Compliant
TOP254EG	Power Integrations	TOPSwitch®-HX	Active	Flyback	700V	66kHz, 132kHz	78%	62 W	Current Limiting, Over Temperature, Over Voltage	-40°C ~ 150°C	7-SSIP eSIP-7C	Through Hole	RoHS Compliant
TOP254EN	Power Integrations	TOPSwitch®-HX	Active	Flyback	700V	66kHz, 132kHz	78%	62 W	Current Limiting, Over Temperature, Over Voltage	-40°C ~ 150°C	7-SSIP eSIP-7C	Through Hole	RoHS Compliant
TOP255EG	Power Integrations	TOPSwitch®-HX	Active	Flyback	700V	66kHz, 132kHz	78%	81 W	Current Limiting, Over Temperature, Over Voltage	-40°C ~ 150°C	7-SSIP eSIP-7C	Through Hole	RoHS Compliant
TOP255EN	Power Integrations	TOPSwitch®-HX	Active	Flyback	700V	66kHz, 132kHz	78%	81 W	Current Limiting, Over Temperature, Over Voltage	-40°C ~ 150°C	7-SSIP eSIP-7C	Through Hole	RoHS Compliant
TOP256EG	Power Integrations	TOPSwitch®-HX	Active	Flyback	700V	66kHz, 132kHz	78%	119 W	Current Limiting, Over Temperature, Over Voltage	-40°C ~ 150°C	7-SSIP eSIP-7C	Through Hole	RoHS Compliant
TOP256EN	Power Integrations	TOPSwitch®-HX	Active	Flyback	700V	66kHz, 132kHz	78%	119 W	Current Limiting, Over Temperature, Over Voltage	-40°C ~ 150°C	7-SSIP eSIP-7C	Through Hole	RoHS Compliant

Engineering Selection Recommendations

Product Status Consideration: The TOP259LN is classified as obsolete. All identified substitute parts maintain Active product status, ensuring continued manufacturing support, technical documentation availability, and supply chain reliability. Selection of an Active substitute is necessary for long-term design viability.

Compliance and Certification: All substitute parts maintain identical compliance certifications to the TOP259LN:

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

Power Output Selection: The TOP259LN operates at 162 W. No substitute part in the provided list matches this exact power rating. The highest-power substitute available is TOP256EG and TOP256EN at 119 W. Selection of a substitute must account for the specific power requirement of the target application. If the application requires 162 W output, a substitute from this list may not be suitable without circuit redesign.

Packaging Compatibility: The TOP259LN uses eSIP-7F packaging; substitute parts use eSIP-7C packaging. Both configurations maintain 7-SSIP, 6-lead, exposed-pad, formed-lead through-hole mounting. PCB layout modifications may be required to accommodate package differences.

Electrical Equivalence: All substitute parts maintain the following electrical parameters identical to the TOP259LN:

700V breakdown voltage
66kHz and 132kHz switching frequency capability
78% duty cycle
Identical fault protection (Current Limiting, Over Temperature, Over Voltage)
Operating temperature range -40°C to 150°C (TJ)

Frequently Asked Questions (FAQ)

Q: Can TOP256EN directly replace TOP259LN in an existing design?

A: TOP256EN shares all core electrical parameters with TOP259LN (700V breakdown, 66/132kHz switching, 78% duty cycle, identical fault protection, same operating temperature range). However, TOP256EN is rated at 119 W versus TOP259LN at 162 W. If the application requires the full 162 W output, TOP256EN cannot provide equivalent power delivery. Additionally, packaging differs (eSIP-7C versus eSIP-7F), requiring PCB layout verification. All substitute parts are Active status, providing supply continuity.

Q: What is the difference between TOP252EG and TOP252EN?

A: TOP252EG and TOP252EN are both Active TOPSwitch®-HX series parts with identical electrical specifications (21 W, 700V, 66/132kHz, 78% duty cycle, identical fault protection, -40°C to 150°C operating range, 7-SSIP eSIP-7C packaging). The primary difference is packaging format designation (EG versus EN suffix). Both maintain RoHS compliance and identical thermal/electrical characteristics. Inventory availability differs: TOP252EN has 5100 units in stock versus TOP252EG with 696 units.

Q: Why does the TOP259LN have higher power rating (162 W) than available substitutes?

A: The TOP259LN uses eSIP-7F packaging, while substitute parts use eSIP-7C packaging. Power rating differences reflect the specific design and thermal characteristics of each package variant within the TOPSwitch®-HX series. The eSIP-7F configuration of TOP259LN enables higher power output. Substitutes must be selected based on actual application power requirements.

Q: Are all substitute parts through-hole mounted?

A: Yes. All substitute parts listed maintain through-hole mounting type with 7-SSIP, 6-lead, exposed-pad, formed-lead configuration. This ensures compatibility with existing through-hole PCB designs, though package footprint differences between eSIP-7F and eSIP-7C require layout verification.

Q: What is the significance of the EG and EN suffixes in part numbers?

A: The EG and EN suffixes denote packaging format variants within the TOPSwitch®-HX series. Both maintain identical electrical specifications and compliance certifications. The suffix distinction allows differentiation in inventory and supply chain management but does not affect electrical equivalence or functional performance.

Q: Can I use TOP255EN in place of TOP259LN for a 100 W application?

A: TOP255EN is rated at 81 W, which is below the 100 W requirement. While TOP255EN shares all core electrical parameters with TOP259LN (700V, 66/132kHz, 78% duty cycle, identical fault protection, same operating temperature), it cannot deliver 100 W output. TOP256EG or TOP256EN at 119 W would be suitable for a 100 W application, provided PCB layout accommodates the eSIP-7C package variant.

Q: Are substitute parts RoHS compliant?

A: Yes. All substitute parts maintain RoHS Compliant status identical to TOP259LN. REACH status is REACH Unaffected for all parts. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating no moisture sensitivity restrictions.

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