Diodes Incorporated

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QC2.0/AFC decoder (PSR based)

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The AP4373A is an AC/DC secondary-side controller, which incorporates a decoder to translate Qualcomm QC2.0 protocol and transfer control signal to the primary side through opto-coupler.

The AP4373A can be used in Diodes Incorporated’s primary-side controlled AC/DC systems to achieve fast voltage transition, low noload power consumption and fast dynamic load response. When paired with Diodes Incorporated’s primary-side controller AP3792, the AP4373A uses one opto-coupler to transfer all necessary information to the AP3792 including output voltage/current change requests, output dynamic response and abnormal condition protection signal.

The AP4373A integrates a safe-discharge circuitry to quickly and reliably discharge output capacitors when the output terminal is plugged out.

This IC is available in SOT25 package.


  • Support Qualcomm QC2.0 Protocol Combined with the AP3792 (QC2.0: 5V/9V)
  • Low Standby Power
  • Fast Dynamic Response
  • Built in Opto Coupler LED Driver
  • Output Capacitor Safe-Discharge Circuitry
  • Fewest External Component Count
  • Output Over Voltage Protection (OVP)
  • D+/D- Over Voltage Protection
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/


  • AC/DC Adapters
  • Battery Chargers

Product Specifications

Product Parameters

Protocols Supported QC2.0/AFC (Hardwired)
Power Role Source
VCC Maximum Rating 20 V

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Technical Documents

Recommended Soldering Techniques



Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2492 2020-11-04 2021-05-04 Device End of Life (EOL)