Diodes Menu Close
Contact Sales

Log in or register to manage email notifications about changes to datasheets or PCNs for this part.


The AP4340S is an output voltage detector for Primary Side Control System. It is a low power loss solution. It detects the output voltage and provides a periodical signal when the output voltage is lower than a certain threshold. The periodical signal can be coupled by the transformer to the primary side and provided as an awakening signal for the main primary side controller. By fast response to secondary side voltage, the AP4340S can effectively improve the transient performance of Primary Side Control System.
AP4340S will enable a discharge circuit when it detects the output voltage is higher than a certain threshold.
The AP4340S is available in SOT23 package.


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


  • Fast Detector of Supply Voltages
  • 33kHz Output Pulse
  • No External Components
  • Low Power Loss for Green Mode Applications
  • Totally Lead-free & Fully RoHS Compliant
  • Halogen and Antimony Free. “Green” Device

Product Specifications

Product Parameters

VCC Max 5.5 V
Power-on Voltage (V) 3.1
Startup Current 5 µA
Operating Current 15 µA
Trigger Voltage (V) 4.73
Discharge Voltage (V) 5.3
VOVP (V) 5.78
Discharge Current (mA) 2.2
IOVP (mA) 170

Related Content



Technical Documents

Recommended Soldering Techniques


Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AP4340SNTR-G1 Digi-Key Electronics 2965 8/11/2020 Buy Now United States