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APR34309CA is a secondary side Combo IC, which combines an NChannel MOSFET and a driver circuit designed for synchronous rectification (SR) in DCM operation. It also integrates output voltage detect function for primary side control system.
The N-Channel MOSFET has been optimized for low gate charge, low RDS(ON), fast switching speed and body diode reverse recovery performance.
The synchronous rectification can effectively reduce the secondary side rectifier power dissipation and provide high performance solution. By sensing MOSFET drain-to-source voltage, APR34309CA can output ideal drive signal with less external components. It can provide high performance solution for 5V output voltage application.
Same as AP4341, APR34309CA 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, APR34309CA can effectively improve the transient performance of primary side control system.
The APR34309CA is available in SO-8EP 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 Voltages
• Fewest External Components
• Totally Lead-free & Fully RoHS Compliant 
• Halogen and Antimony Free. “Green” Device

Product Specifications

Product Parameters

Internal Trigger Voltage 5.15 V
VCC Max 6
Operating Current 100 µA
Turn-Off Threshold Voltage -9 mV
Min On-Time (ns) 1800
Turn-Off Delay 100 ns
Drain Rating 50 V
Switching FET 8

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Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
APR34309CAMPTR-G1 Digi-Key Electronics 3458 8/11/2020 Buy Now United States
APR34309CAMPTR-G1 Mouser Electronics Inc. 204 8/11/2020 Buy Now United States