TOP257GN-TL Equivalent & Substitute Parts

Part Overview

The TOP257GN-TL is an offline switch flyback converter IC manufactured by Power Integrations, part of the TOPSwitch®-HX series. This isolated power management IC operates at 66 kHz switching frequency with 41 W output power capability and is designed for offline flyback topology applications. The device is Active status and RoHS compliant, suitable for surface mount assembly in 8-SMD packaging.

Substitute parts are necessary when the primary part is unavailable, when inventory constraints require alternative sourcing, or when application power requirements differ from the 41 W specification of the TOP257GN-TL.

Key Parameters

Parameter	Value
Manufacturer Part Number	TOP257GN-TL
Manufacturer	Power Integrations
Series	TOPSwitch®-HX
Category	Power Management (PMIC)
Topology	Flyback
Output Isolation	Isolated
Voltage - Breakdown	700V
Frequency - Switching	66 kHz
Power (Watts)	41 W
Duty Cycle	78%
Fault Protection	Current Limiting, Over Temperature, Over Voltage
Operating Temperature	-40°C ~ 150°C (TJ)
Package / Case	8-SMD (7 Leads), Gull Wing
Supplier Device Package	SMD-8C
Mounting Type	Surface Mount
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	4 (72 Hours)
Product Status	Active

Substitute Part Grouping Explanation

Substitution of TOP257GN-TL with equivalent parts from the TOPSwitch®-HX series is based on the following criteria:

Mandatory Matching Parameters:

Topology: Flyback
Output Isolation: Isolated
Voltage - Breakdown: 700V
Frequency - Switching: 66 kHz
Duty Cycle: 78%
Package / Case: 8-SMD (7 Leads), Gull Wing
Supplier Device Package: SMD-8C
Operating Temperature Range: -40°C ~ 150°C (TJ)
Fault Protection: Current Limiting, Over Temperature, Over Voltage
RoHS Status: RoHS Compliant
Moisture Sensitivity Level: 4 (72 Hours)

Variable Parameter (Application-Dependent):

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

All substitute parts maintain identical electrical characteristics, thermal specifications, protection features, and packaging. The primary differentiation is output power rating, which determines suitability based on application requirements.

Parameter Comparison

Part Number	Power (W)	Topology	Voltage Breakdown (V)	Switching Frequency (kHz)	Duty Cycle (%)	Package	Operating Temp (°C)	Inventory (Pcs)
TOP257GN-TL	41	Flyback	700	66	78	8-SMD (7L) Gull Wing	-40 ~ 150	1388
TOP252GN-TL	15	Flyback	700	66	78	8-SMD (7L) Gull Wing	-40 ~ 150	3024
TOP253GN-TL	25	Flyback	700	66	78	8-SMD (7L) Gull Wing	-40 ~ 150	6300
TOP254GN-TL	28	Flyback	700	66	78	8-SMD (7L) Gull Wing	-40 ~ 150	4100
TOP255GN-TL	30	Flyback	700	66	78	8-SMD (7L) Gull Wing	-40 ~ 150	7600
TOP256GN-TL	34	Flyback	700	66	78	8-SMD (7L) Gull Wing	-40 ~ 150	1224
TOP258GN-TL	48	Flyback	700	66	78	8-SMD (7L) Gull Wing	-40 ~ 150	2650

Engineering Selection Recommendations

For Direct Replacement (41 W Applications): The TOP257GN-TL is the specified component. All substitute parts in this series share identical electrical topology, voltage ratings, switching characteristics, and thermal operating range. Substitution is valid only when the application power requirement aligns with the substitute part's rated output.

For Lower Power Applications (Below 41 W):

TOP252GN-TL (15 W): Suitable for applications requiring 15 W or less
TOP253GN-TL (25 W): Suitable for applications requiring 25 W or less
TOP254GN-TL (28 W): Suitable for applications requiring 28 W or less
TOP255GN-TL (30 W): Suitable for applications requiring 30 W or less
TOP256GN-TL (34 W): Suitable for applications requiring 34 W or less

For Higher Power Applications (Above 41 W):

TOP258GN-TL (48 W): Suitable for applications requiring up to 48 W

Compliance and Certification: All parts maintain Active product status, RoHS compliance, REACH unaffected status, and identical MSL rating of 4 (72 Hours). All parts are manufactured by Power Integrations and belong to the TOPSwitch®-HX series.

Packaging Consideration: TOP258GN-TL is supplied in Cut Tape (CT) & Digi-Reel® packaging, while TOP257GN-TL and all other substitutes are supplied in Tape & Reel (TR) packaging. This difference affects handling and assembly processes but does not impact electrical or thermal performance.

Frequently Asked Questions (FAQ)

Q: Can TOP255GN-TL replace TOP257GN-TL in a 41 W application?

A: No. TOP255GN-TL is rated for 30 W maximum output power. Using it in a 41 W application exceeds its power specification and violates the electrical design parameters of the TOPSwitch®-HX series.

Q: Are all substitute parts pin-compatible with TOP257GN-TL?

A: Yes. All parts use identical 8-SMD (7 Leads) Gull Wing packaging with SMD-8C supplier device package designation. Pin configuration and footprint are identical across the entire substitute series.

Q: What is the difference between Tape & Reel and Cut Tape & Digi-Reel® packaging?

A: Both are surface mount delivery formats. Tape & Reel (TR) provides continuous reel packaging for automated assembly lines. Cut Tape (CT) & Digi-Reel® provides individual tape segments. The electrical and thermal characteristics of the IC are identical; packaging affects only logistics and assembly handling.

Q: Can TOP258GN-TL be used in place of TOP257GN-TL?

A: Yes, from an electrical and thermal standpoint. TOP258GN-TL is rated for 48 W, which exceeds the 41 W requirement of TOP257GN-TL. The device operates at identical switching frequency, voltage breakdown, duty cycle, and temperature range. However, application circuit design must accommodate the higher power capability.

Q: Are there any differences in fault protection between substitute parts?

A: No. All parts in the TOPSwitch®-HX series, including TOP257GN-TL and all substitutes, provide identical fault protection: Current Limiting, Over Temperature, and Over Voltage protection.

Q: What is the operating temperature range for all substitute parts?

A: All parts operate from -40°C to 150°C junction temperature (TJ). This range is identical across TOP257GN-TL and all substitute parts.

Q: Do all substitute parts have the same RoHS and REACH compliance status?

A: Yes. All parts are RoHS Compliant and REACH Unaffected. Compliance status is uniform across the entire TOPSwitch®-HX series presented in this reference.

Q: What determines whether a substitute part is suitable for my application?

A: The primary determining factor is the application's power requirement in watts. Select a substitute part with a power rating equal to or greater than your application's maximum power demand. All other electrical, thermal, and protection parameters are identical across the series.

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