Overvoltage Protector with Bidirectional Blocking and Surge Protection

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The KTS1686 over-voltage protection device features high current integrated N-Ch MOSFETs with an ultra-low IN to OUT on-resistance of 65mΩ (typical), actively protecting low-voltage systems from voltage supply faults up to +28VDC. An internal clamp protects the device from surges up to +100V.

An input voltage exceeding the over-voltage threshold will cause the internal MOSFET to turn off, preventing excessive voltage from damaging downstream devices.

When the OVLO input set below the external OVLO select voltage, the KTS1686 automatically chooses the internal fixed OVLO threshold, preset to 5.885V (typical). The over-voltage protection threshold can be adjusted with optional resistor divider to a voltage between 5V and 22V.

The KTS1686 also features reverse bias blocking, preventing any voltage present at OUT not feeding back into IN when the device is in the OFF state. When OTG_EN is high, the path from OUT to IN is enabled, to permit the powering of external OTG peripherals.

The KTS1686 also features additional protection including enhanced ESD protection and thermal protection to protect against over-load conditions.

The KTS1686 is available in a RoHS and Green compliant 15-Bump 1.6mm x 2.1mm WLCSP.


  • Wide Input voltage range: 3.0V to +28V
  • Integrated typical 65mΩ N-Channel MOSFET
  • 4.5A Continuous Current
  • Wide Overvoltage threshold range
    • Adjustable: 5V to 22V
    • Fixed: 5.885V ± 3%
  • Fast Overvoltage response time 100ns
  • Start-up Debounce time : 20ms (typ.)
  • Low Quiescent Current : 140µA (typ.)
  • Integrated Protection
    • Thermal Shutdown
    • Under voltage protection (UVLO)
    • Soft-Start
    • OUT to IN Reverse Blocking
  • Open-drain & Logic Output Power Good pins
  • Integrated Surge Protection up to +100V
  • Pb-free Package:
    • 15-Bump WLCSP 1.6mm x 2.1mm
  • -40°C to +85°C Temperature Range


  • Smartphones and Tablets
  • Mobile Internet Devices
  • Peripherals, E-Readers

Packaging Information

Package Dimensions Bumps Package Code
WLCSP35-15 2.13mm x 1.56mm x 0.64mm 15 UF


Vin (min) Vin (max) ON Resistance Max Current (A)
2.3V 28V 65mΩ 4.5A

Technical Documentation

Description Documents Type
Package Outline DrawingWLCSP35-15 UF PODPDF


Part Number Marking Operating Temperature Package
KTS1686EUF-TR ILYYZZ -40°C to +85°C WLCSP-15
Purchase Options
Buy from Digi-Key
Buy from Mouser