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Product attributes Property Value
Manufacturer Power Integrations
Product Series TinySwitch®-4
Packaging Cut Tape (CT) | Tape & Reel (TR)
Output Isolation Isolated
Internal Switch(s) Yes
Voltage - Breakdown 725V
Topology Flyback
Voltage - Start Up -
Voltage - Supply (Vcc/Vdd) -
Duty Cycle 67%
Frequency - Switching 124kHz ~ 140kHz
Power (Watts) 25 W
Fault Protection Current Limiting, Open Loop, Over Temperature, Over Voltage, Short Circuit
Control Features EN
Operating Temperature -40°C ~ 150°C (TJ)
Grade -
Qualification -
Mounting Type Surface Mount
Package / Case 12-BESOP (0.350", 8.89mm Width), 11 Leads, Exposed Pad
Supplier Device Package 12-ESOP
ROHS RoHS Compliant - Hazardous Substance Free Electronic Components | HQICKEY

The TNY289KG-TL from Power Integrations is a TinySwitch-4 isolated flyback switcher integrating a 725V switch for offline supplies up to 25W. It operates from 124kHz to 140kHz with a 67% maximum duty cycle and includes current limiting, open loop, over temperature, over voltage, and short circuit protection. The device is rated for -40°C to 150°C junction temperatures in a 12-BESOP package with exposed pad.

  • Integrated 725V switch simplifies isolated flyback designs and reduces external parts.
  • Up to 25W output with a 67% maximum duty cycle.
  • 124kHz to 140kHz switching supports compact magnetics.
  • Current limiting, open loop, over temperature, over voltage, and short circuit protection improve reliability.
  • -40°C to 150°C junction range suits demanding thermal environments.

25W Isolated Adapters

The TNY289KG-TL TinySwitch-4 flyback switcher integrates a 725V switch, delivering galvanically isolated output up to 25W with a 67% maximum duty cycle.

Chargers and Auxiliary Supplies

Operating from 124kHz to 140kHz, this device supports compact isolated flyback designs with current limiting, open loop, over temperature, over voltage, and short circuit protection.

Appliance and Industrial Power

With a -40°C to 150°C junction temperature range, the device suits isolated flyback stages in demanding thermal environments.

Space-Constrained Boards

The 12-BESOP package with exposed pad enables dense isolated flyback layouts with the EN control feature.

Q: What topology does the TNY289KG-TL use?
A: It is a flyback switcher for isolated offline supplies.
Q: Does it have an integrated switch?
A: Yes, it integrates a 725V switch.
Q: What power level does it target?
A: Up to 25W.
Q: What is the maximum duty cycle?
A: 67%.
Q: What switching frequency does it use?
A: 124kHz to 140kHz.
Q: What protections are included?
A: Current limiting, open loop, over temperature, over voltage, and short circuit protection.
Base Product Number : TNY289KG
12-BESOP 25W Flyback Converter Integrated Switch Isolated Offline AC-DC Switcher Power Integrations TinySwitch-4
Q: What topology does the TNY289KG-TL use?
A: It is a flyback switcher for isolated offline supplies.
Q: Does it have an integrated switch?
A: Yes, it integrates a 725V switch.
Q: What power level does it target?
A: Up to 25W.
Q: What is the maximum duty cycle?
A: 67%.
Q: What switching frequency does it use?
A: 124kHz to 140kHz.
Q: What protections are included?
A: Current limiting, open loop, over temperature, over voltage, and short circuit protection.