Type-C CC and SBU Short to VBUS Over-Voltage and IEC ESD Protection Switch


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The RT1738 is an USB Type-C interface over-voltage protection IC.

The RT1738 protects the high voltage shorted to VBUS to adjacent pins of CC/SBU up to 28V due to USB Power Delivery (PD) allowing VBUS from 3.3 to 21V sourcing.

The RT1738 is integrated the protection ESDs of IEC61000-4-2 with contact discharge ±8kV on CON_CC1/CON_CC2, D1/D2 and ±6kV on CON_SBU1/CON_SBU2. The surge immunity level of CON_CC1 /CON_CC2 is up to ±35V. Besides, the ultra-fast OVP response time of 60ns can protect the system side of application IC from damage.

The RT1738 is available in a 3x3mm WQFN package.


  • PC/Notebook
  • Smart Phone/Tablet
  • TV/Monitor
  • USB-C Dongle/Docking/Hubs
Key Spec.
Status Active
Policy Manager Integrated
Alternate Mode No
MCU Integrated No
Power Role Consumer
Data Role Dual Role
External Power Path Control No
Internal Power Path No
Iq (Typ) (μA) 40
Realtime VBUS Monitoring No
Dead Battery Support Yes
PWM Controller No
Max Output Voltage (V) 5.5
Syn. Rectifier No
VBUS Discharge No
Interface Data Switch;OVP Switch
Features OVP
Package Type WQFN3x3-20
  • 4-Channels of short to VBUS Over-Voltage Protection (CON_CC1, CON_CC2, CON_SBU1, CON_SBU2)
  • IEC61000-4-2 Contact Discharge Protection
    ► CON_CC1/CON_CC2 : ±8kV
    ► D1/D2 : ±8kV
    ► CON_SBU1/CON_SBU2 : ±6kV
  • High Absolute Maximum Ratings = 28V of CON_CC1, CON_CC2, CON_SBU1 and CON_SBU2
  • 60ns Ultra-Fast OVP Response Time of CC/SBU
  • 255mΩ Ultra-Low RON of CC Switch Typical
  • 3.6Ω Low RON of SBU Switch Typical
  • 40μA Low Quiescent Current in Standby
  • High Bandwidth of 1.1GHz for SBU Switch
  • Dead Battery Support
  • 20-Pin 3x3mm WQFN Package
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Type-C CC and SBU Short to VBUS Over-Voltage and IEC ESD Protection Switch2020/07/22