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APR343 is a secondary side MOSFET driver for synchronous rectification in DCM operation, which integrates the output voltage detection function for primary side control system.

The synchronous rectification can effectively reduce the secondary side rectifier power dissipation and provide high performance solution. By sensing MOSFET drain-to-source voltage, APR343 can output ideal drive signal with less external components. It can provide high performance solution for 5V output voltage application.

Same as AP4341, APR343 detects the output voltage and provides a periodical signal when the output voltage is lower than a certain threshold. By fast response to secondary side voltage, APR343 can effectively improve the transient performance of primary side control system.

The APR343 is available in SOT25 package.


  • Adapters/Chargers for Cell/Cordless Phones, ADSL Modems, MP3 and Other Portable Apparatus
  • Standby and Auxiliary Power Supplies 


  • Synchronous Rectification for DCM Operation Flyback
  • Eliminate Resonant Ring Interference
  • Fast Detector of Supply Voltage
  • Fewest External Components
  • Totally Lead-free & Fully RoHS Compliant 
  • Halogen and Antimony Free. “Green” Device 

Product Specifications

Product Parameters

Internal Trigger Voltage 5.3 V
Operating Current 100 µA
Turn-Off Threshold Voltage -12.5 mV
Min On-Time (ns) 1800
Turn-Off Delay 100 ns
Drain Rating 50 V
Switching FET External

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Quality & Reliability

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Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
APR34309CAMPTR-G1 Digi-Key Electronics 3458 7/22/2019 Buy Now Americas
APR34309CAMPTR-G1 Mouser Electronics Inc. 204 7/22/2019 Buy Now Americas
APR34309CMPTR-G1 Digi-Key Electronics 4560 7/22/2019 Buy Now Americas
APR34309CMPTR-G1 Mouser Electronics Inc. 1676 7/22/2019 Buy Now Americas
APR34309MPTR-G1 Digi-Key Electronics 7987 7/22/2019 Buy Now Americas
APR34309MPTR-G1 Mouser Electronics Inc. 4000 7/22/2019 Buy Now Americas
APR34330CMPTR-G1 Digi-Key Electronics 3930 7/22/2019 Buy Now Americas
APR343KTR-G1 Mouser Electronics Inc. 2915 7/22/2019 Buy Now Americas


Product Change Notices

PCN # Issue Date Subject
PCN-2246 2017-28-06 Additional Qualified Assembly/Test (A/T) Site – Chengdu A/T (CAT) with Part Marking Update