Diodes Incorporated

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APR345 (Not Recommended for new design)

NRND = Not Recommended for New Design

Secondary Side Synchronous Rectification Controller

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APR345 is a secondary side MOSFET driver for synchronous rectification, supports CCM, DCM and Quasi-Resonant Flyback Topologies.

The synchronous rectification can effectively reduce the secondary side rectifier power dissipation and provide high performance solution. By sensing primary MOSFET gate-to-source voltage, APR345 can output ideal drive signal with less external components. It can provide high performance solution for 5V to 12V output voltage application.

The APR345 is available in SOT26 package.


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


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

Product Specifications

Product Parameters

Internal MOSFETDrain Rating (V) 120
Min On-Time (ns) 1600
OperatingCurrent (µA) 250
Internal MOSFET Rds(on)(MΩ) External
Turn-OffDelay (ns) 100
Turn-OffThresholdVoltage (mV) -11.5
VCC Maximum Rating 16

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