The KTS1601 is slew rate controlled load switch designed for 1.5V to 5.5V operation. It features a controlled soft-on slew rate of typical 2.7ms that limits the inrush current for designs with heavy capacitive loads and thereby minimizing any resulting voltage droop at the power rails.
The very low RDS(ON) allows currents up to 2.0A, whilst minimizing the power dissipation and voltage drop from supply to load. The KTS1601 features an active high enable pin, which is capable of interfacing directly with low input control signals, without any additional level shifting circuitry. The KTS1601 also includes an active pull-down option to ensure the device remains off, should the enable be allowed to float.
The KTS1601 provides reverse blocking in the OFF state to ensure that power supplies are not discharged.
The KTS1601 is available in an optimized, lead-free, fully green compliant, small 4-pin WLCSP 1.0 x 1.0mm package with 0.5mm pitch


  • Operating Range: 1.5V~5.5V
  • Low RDS(ON) MOSFET: Typ. 24mΩ @ 3.3V
  • Continuous DC current up to 2.0A
  • Built-in slew rate controlled turn-on: 2.7ms
  • Low quiescent current < 1µA
  • ESD Protection
    • Human Body Model : 8kV
    • Charged Device Model : >2.0kV
    • Compliance to IEC61000-4-2 level 4
      • Contact Discharge : 8kV
      • Air Discharge : 15kV
  • Pb-Free Packages
    • WLCSP-4, 1.0 x 1.0mm
    • RoHS and Green Compliant
  • -40°C to +85°C Temperature Range


  • Mobile Phones and Tablets
  • SSD (Solid State Drive)
  • Portable Instruments

Packaging Information

Package Dimensions Bumps Package Code
WLCSP-4 1.0 mm x 1.0 mm x 0.625 mm 4 UM


Vin (min)  Vin (max)  ON Resistance (mΩ) Max Current (A) IEC 61000-4-2 ESD (Air Discharge) IEC 61000-4-2 ESD (Contact Discharge)
1.5V 5.5V 20.0 2.0 ±15kV ±8kV

Technical Documentation

Description Documents Type
Package Outline DrawingWLCSP22-4 UM PODPDF

Evaluation Tools

Documents Type
KTS1601 User ManualPDF
KTS1601 Quick Start GuidePDF
KTS1601 Bill of MaterialsXLSX
KTS1601 SchematicPDF
KTS1601 3D BoardPDF


Part Number Marking Operating Temperature Package
KTS1601EUM-TR KKYYZ -40°C to +85°C WLCSP-4
KTS1601EUM-1-TR JMYYZ -40°C to +85°C WLCSP-4
Purchase Options
Buy from Digi-Key
Buy from Mouser