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Product attributes Property Value
Manufacturer Power Integrations
Product Series TOPSwitch®-HX
Packaging Cut Tape (CT) | Tape & Reel (TR)
Output Isolation Isolated
Internal Switch(s) Yes
Voltage - Breakdown 700V
Topology Flyback
Voltage - Start Up -
Voltage - Supply (Vcc/Vdd) -
Duty Cycle 78%
Frequency - Switching 66kHz
Power (Watts) 41 W
Fault Protection Current Limiting, Over Temperature, Over Voltage
Control Features -
Operating Temperature -40°C ~ 150°C (TJ)
Grade -
Qualification -
Mounting Type Surface Mount
Package / Case 8-SMD (7 Leads), Gull Wing
Supplier Device Package SMD-8C
ROHS RoHS Compliant - Hazardous Substance Free Electronic Components | HQICKEY

The Power Integrations TOP257GN-TL is an isolated flyback offline switcher from the TOPSwitch-HX series with an integrated 700V switch, rated for up to 41 W. It operates at 66kHz with 78% maximum duty cycle and includes Current Limiting, Over Temperature, and Over Voltage protection in an 8-SMD gull-wing package.

  • Integrated 700V switch simplifies isolated flyback designs.
  • 41 W output supports mid-power offline supplies.
  • 78% maximum duty cycle enables efficient energy transfer.
  • Current Limiting, Over Temperature, and Over Voltage protection enhance reliability.
  • -40°C to 150°C junction range suits demanding environments.

Mid-Power Offline Adapters

The TOP257GN-TL delivers up to 41 W in an isolated flyback topology with an integrated 700V switch, suited to mid-power adapters and power supplies.

Industrial Power Supplies

Operating over -40°C to 150°C junction temperature, this TOPSwitch-HX device supports industrial supplies that must tolerate elevated thermal conditions.

Consumer Electronics Power

A 66kHz switching frequency with 78% maximum duty cycle supports compact flyback designs for consumer equipment.

Reliable Offline Conversion

Current Limiting, Over Temperature, and Over Voltage protection help safeguard offline power stages.

Q: What topology does the TOP257GN-TL use?
A: It is an isolated flyback offline switcher with an integrated switch.
Q: What is the breakdown voltage?
A: 700V.
Q: What is the maximum output power?
A: 41 W.
Q: What is the switching frequency?
A: 66kHz with 78% maximum duty cycle.
Q: What protections are included?
A: Current Limiting, Over Temperature, and Over Voltage.
Base Product Number : TOP257GN
41 W 66kHz 700V 8-SMD Flyback Converter Isolated Offline Switcher TOPSwitch-HX
Q: What topology does the TOP257GN-TL use?
A: It is an isolated flyback offline switcher with an integrated switch.
Q: What is the breakdown voltage?
A: 700V.
Q: What is the maximum output power?
A: 41 W.
Q: What is the switching frequency?
A: 66kHz with 78% maximum duty cycle.
Q: What protections are included?
A: Current Limiting, Over Temperature, and Over Voltage.