TOP242PN Equivalent & Substitute Parts

Part Overview

The TOP242PN is an offline switch flyback converter IC manufactured by Power Integrations, part of the TOPSwitch®-GX series. This device integrates a high-voltage power switch with control circuitry for isolated flyback topology applications, delivering 15 W output power with integrated fault protection. The TOP242PN carries a "Not For New Designs" product status, indicating it is a legacy component. Identifying equivalent and substitute parts is necessary for design continuity, supply chain flexibility, and transition to active product lines where applicable.

Key Parameters

Parameter	Value
Manufacturer Part Number	TOP242PN
Manufacturer	Power Integrations
Series	TOPSwitch®-GX
Category	Power Management (PMIC)
Topology	Flyback
Output Isolation	Isolated
Voltage - Breakdown	700V
Frequency - Switching	66kHz ~ 132kHz
Power (Watts)	15 W
Duty Cycle	66.5%
Fault Protection	Current Limiting, Over Temperature, Over Voltage
Control Features	Frequency Control
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)
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitute parts for the TOP242PN are classified into two categories based on substitution criteria:

Parametric Equivalents (Same Series - TOPSwitch®-GX): TOP243PN, TOP244PN, TOP245PN, and TOP246PN are direct parametric equivalents within the TOPSwitch®-GX series. These parts share identical electrical and mechanical characteristics with the TOP242PN, including:

Voltage breakdown: 700V
Switching frequency range: 66kHz ~ 132kHz
Duty cycle: 66.5%
Package: 8-DIP (0.300", 7.62mm), 7 Leads
Fault protection: Current Limiting, Over Temperature, Over Voltage
Control features: Frequency Control
Operating temperature: -40°C ~ 150°C (TJ)
RoHS compliance and MSL rating

The primary difference among these parts is output power rating: TOP243PN (25 W), TOP244PN (28 W), TOP245PN (30 W), and TOP246PN (34 W). Selection depends on application power requirements.

Similar Topology Alternatives: TNY288PG (Power Integrations, TinySwitch®-4 series) and NCP1060AP100G (onsemi) offer alternative offline switch solutions with flyback topology support. These parts differ in switching frequency range, power rating, fault protection features, and in the case of NCP1060AP100G, package configuration and supply voltage specifications.

Parameter Comparison

Parameter	TOP242PN	TOP243PN	TOP244PN	TOP245PN	TOP246PN	TNY288PG	NCP1060AP100G
Manufacturer	Power Integrations	Power Integrations	Power Integrations	Power Integrations	Power Integrations	Power Integrations	onsemi
Series	TOPSwitch®-GX	TOPSwitch®-GX	TOPSwitch®-GX	TOPSwitch®-GX	TOPSwitch®-GX	TinySwitch®-4	-
Topology	Flyback	Flyback	Flyback	Flyback	Flyback	Flyback	Buck, Flyback
Output Isolation	Isolated	Isolated	Isolated	Isolated	Isolated	Isolated	Either
Voltage - Breakdown	700V	700V	700V	700V	700V	725V	700V
Frequency - Switching	66kHz ~ 132kHz	66kHz ~ 132kHz	66kHz ~ 132kHz	66kHz ~ 132kHz	66kHz ~ 132kHz	124kHz ~ 140kHz	60kHz
Power (Watts)	15 W	25 W	28 W	30 W	34 W	16 W	8.3 W
Duty Cycle	66.5%	66.5%	66.5%	66.5%	66.5%	67%	66%
Fault Protection	Current Limiting, Over Temperature, Over Voltage	Current Limiting, Over Temperature, Over Voltage	Current Limiting, Over Temperature, Over Voltage	Current Limiting, Over Temperature, Over Voltage	Current Limiting, Over Temperature, Over Voltage	Current Limiting, Open Loop, Over Temperature, Over Voltage, Short Circuit	Over Load, Over Power, Over Temperature, Short Circuit
Control Features	Frequency Control	Frequency Control	Frequency Control	Frequency Control	Frequency Control	EN	-
Operating Temperature	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 125°C (TJ)
Package / Case	8-DIP (0.300", 7.62mm), 7 Leads	8-DIP (0.300", 7.62mm), 7 Leads	8-DIP (0.300", 7.62mm), 7 Leads	8-DIP (0.300", 7.62mm), 7 Leads	8-DIP (0.300", 7.62mm), 7 Leads	8-DIP (0.300", 7.62mm), 7 Leads	8-DIP (0.300", 7.62mm), 7 Leads
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant
Product Status	Not For New Designs	Not For New Designs	Not For New Designs	Not For New Designs	Not For New Designs	Active	Active

Engineering Selection Recommendations

For Direct Replacement (Same Series): TOP243PN, TOP244PN, TOP245PN, and TOP246PN are direct parametric equivalents suitable for applications requiring identical electrical and mechanical characteristics. These parts maintain the same package footprint, switching frequency range, control methodology, and fault protection architecture. Selection among these equivalents should be based on application power requirements. All parts in this group carry "Not For New Designs" status, indicating legacy product classification.

For Active Product Line Transition: TNY288PG represents an active product alternative from Power Integrations' TinySwitch®-4 series. This part offers higher switching frequency (124kHz ~ 140kHz), enhanced fault protection features (including Open Loop and Short Circuit protection), and active product status. TNY288PG is suitable for applications where higher frequency operation and extended protection features are beneficial, with power rating of 16 W accommodating the TOP242PN's 15 W requirement.

For Alternative Topology Support: NCP1060AP100G from onsemi provides an active alternative with dual topology support (Buck and Flyback). This part operates at 60kHz switching frequency and delivers 8.3 W power output. NCP1060AP100G is classified as active product status. Selection of this part requires verification that application power requirements do not exceed 8.3 W and that the lower operating temperature maximum (-40°C ~ 125°C) is acceptable.

Compliance Considerations: All substitute parts maintain RoHS compliance. TOP242PN, TOP243PN, TOP244PN, TOP245PN, and TOP246PN are RoHS Compliant with MSL rating of 1 (Unlimited). TNY288PG is RoHS Compliant. NCP1060AP100G is ROHS3 Compliant. All parts carry REACH Unaffected status and EAR99 ECCN classification.

Frequently Asked Questions (FAQ)

Q: Can TOP243PN, TOP244PN, TOP245PN, or TOP246PN be used as direct replacements for TOP242PN?

A: Yes. These parts are parametric equivalents within the TOPSwitch®-GX series, sharing identical electrical specifications including voltage breakdown (700V), switching frequency range (66kHz ~ 132kHz), duty cycle (66.5%), package configuration (8-DIP), and fault protection features. The primary difference is output power rating. Selection depends on whether the application power requirement can accommodate the higher power rating of the substitute part.

Q: What is the difference between TOP242PN and TNY288PG?

A: Both are Power Integrations offline switch flyback converters with isolated output and 8-DIP package. Key differences include: TNY288PG operates at higher switching frequency (124kHz ~ 140kHz versus 66kHz ~ 132kHz), provides enhanced fault protection (includes Open Loop and Short Circuit protection), delivers 16 W versus 15 W, and carries active product status versus legacy status. TNY288PG is suitable for applications benefiting from higher frequency operation and extended protection features.

Q: Is NCP1060AP100G compatible with TOP242PN applications?

A: NCP1060AP100G shares the same 8-DIP package and 700V breakdown voltage. However, compatibility requires verification of three factors: (1) application power requirement must not exceed 8.3 W (NCP1060AP100G rating), (2) operating temperature range must fit within -40°C ~ 125°C (versus TOP242PN's -40°C ~ 150°C), and (3) the dual topology support (Buck and Flyback) must align with application requirements. NCP1060AP100G is an active product from onsemi.

Q: Why is TOP242PN marked "Not For New Designs"?

A: "Not For New Designs" indicates the TOP242PN is a legacy product no longer recommended for new circuit designs. For new applications, TNY288PG (active status, TinySwitch®-4 series) or NCP1060AP100G (active status, onsemi) are preferred alternatives. Existing designs using TOP242PN can continue with parametric equivalents (TOP243PN through TOP246PN) for supply continuity.

Q: Are all substitute parts RoHS compliant?

A: Yes. TOP242PN, TOP243PN, TOP244PN, TOP245PN, and TOP246PN are RoHS Compliant. TNY288PG is RoHS Compliant. NCP1060AP100G is ROHS3 Compliant. All parts carry REACH Unaffected status.

Q: What is the package compatibility among these parts?

A: All listed parts use 8-DIP (0.300", 7.62mm) package with 7 leads and through-hole mounting. Package footprint is identical across TOP242PN, TOP243PN, TOP244PN, TOP245PN, TOP246PN, TNY288PG, and NCP1060AP100G, enabling direct PCB layout compatibility.

Q: Which substitute part should be selected for new designs?

A: For new designs, TNY288PG (Power Integrations, TinySwitch®-4, active status) is the recommended choice. It provides active product support, enhanced fault protection features, higher switching frequency, and maintains compatibility with the 8-DIP package. NCP1060AP100G (onsemi, active status) is an alternative if dual topology support and lower power requirements (8.3 W maximum) are acceptable.

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