The RT1731A is Electronically-Marked ID cables IC for USB Type-C cable controller complies with USB Type-C and Power Delivery application with USB4 Cable support, the Electronically-Marked ID cables support USB Power Delivery Structured VDM Discover Identity command directed to SOP’. With Electrically-Marked Cable ID, the DFP host can determine the characteristics of the cable, e.g. its current carrying capability, its performance, and vendor identification, the RT1731A features VBUS short protection on VCONN and CCIN to avoid pin short when VBUS voltage rises above 20V after PD communication is complete.

The RT1731A is available in WDFN-8L 2x2 and WL-CSP-8B 0.96x1.64 (BSC) packages.


  • USB Full-Featured Type-C Cables
Key Spec.
Status Active
Vin (min) (V) 3
Vin (max) (V) 5.5
Package Type WDFN2x2-8;WL-CSP0.96x1.64-8(BSC)
  • Type-C Support/PD Support
    ► Support SOP’and SOP”Communication
    ► Support Host Authentication
    ► Support Additional Modal Operation
    ► Support USB4 Type-C Passive Cable
  • Advantage
    ► Embedded Both Side RA Resistor
    ► Embedded Both Side ISO Diode
    ► Support Multi-Time Writable Memory to Store VDM Data
    ► Support Custom Structured VDM Writing Over CC Pin
    ► Write Protect on Multi One-Time Programmable (OTP) Memory
    ► Support I2C Bus for Programming VDM Data
  • Power
    ► Support 3V to 5.5V Operation on VCON1/VCON2 Pin
  • Protection
    ► HV Protection of VCON1/VCON2/CCIN
  • Package
    ► WDFN-8L 2x2
    ► WL-CSP-8B 0.96x1.64 (BSC)
Technical Documents
TitleLast UpdateDownload
Richtek Selection Guide [Oct., 2022]2022/10/01