The KTU1128 provides four conducting paths with overvoltage protection (OVP) for Type-C’s CC, SBU signals. Once an overvoltage event is detected, it will
shut down all paths to protect circuits in system side, like PD controller from damage.

All the SBU and CC switches have very low on capacitance for broad bandwidth to allow high-speed signal passing through without loss. The CC1/2 switches have low on-resistance for passing VCONN power up to 1.25A.

During dead battery conditions, internal 5.1kΩ resistors automatically pull-down on CC1/2 to ensure that the upstream source provides 5V on VBUS.

The KTU1128 is packaged in RoHS and Green compliant 16-bump WLCSP 1.694mm x 1.694mm
package or 20 pin 3mm x 3mm WQFN package.


  • Thunderbolt™ compatible
  • Overvoltage Protection
    • 32VDC Tolerance on CC1/2, SBU1/2
    • CC1/2 OVP = 5.8V
    • SBU1/2 OVP = 4.8V
    • Fast 70ns Response Time
  • IEC61000-4-5 Surge Protection
    • ±40V Surge Tolerance on CC1/2
    • ±30V Surge Tolerance on SBU1/2
  • IEC61000-4-2 ESD Protection
    • ±15kV air gap on CC1/2, SBU1/2
    • ±8kV contact on CC1/2, SBU1/2
    • ±2kV HBM on all pins (JEDEC JS-001-2017)
  • CC Switches:
    • 1.25A, 270mΩ, 40pF, 140MHz
    • Automatic 5.1kΩ dead battery pull-down
  • SBU Switches:
    • 3Ω, 11pF, 800MHz
  • 2.5V to 5.5V Operating Supply Voltage Range
  • -40°C to 85°C Operating Temperature Range
  • 16-bump WLCSP 1.7mmx1.7mm (0.4mm pitch)
  • 20 pin TQFN 3mmx3mm (0.4mm pitch)
  • P2P upgrade of KTU1121A for 28V EPR
  • RoHS and Green Compliant


  • Notebook PCs, Netbooks, Tablets, Monitors, TVs
  • Gaming Devices, Set-Top Boxes, Networking

Packaging Information

Package Dimensions Bumps Package Code
WQFN33-20 3.00mm x 3.00mm x 0.75mm 20 UAJ
WLCSP44-16 1.694mm x 1.694mm x 0.555mm 16 GAD


Vin Protects Protection Switches Package Package Size (L x W)
CC1/2 SBU1/2 OVP Surge ESD rDS Cap
2.5-5.5 OVP = 5.8V OVP = 4.8V +32V in < 70ns CC1/2= ±60V
SBU1/2= ±40V
Air: ±30V
Contact: ±30V
CC = 0.27Ω
SBU = 3 Ω
CC = 33pF
SBU = 11pF
1.694mm x 1.694mm
3.0 x 3.0mm

Technical Documentation

Description Documents Type
Package Outline DrawingWQFN33-20 UAJ PODPDF


Part Number Marking Operating Temperature Package
KTU1128EUAJ-TD SGYWZaaaaaaa -40°C to +85°C WQFN33-20

Purchase Options Coming Soon