The KTS1640 and KTS1641 are low-resistance, electronically controlled load switches, with enhanced protection features, used to protect loads from abnormal power supply or load problems. Operating from a wide input supply voltage of between 6V and 40V, the KTS1640 and KTS1641 protect the system from reverse input supplies down to -28V.

Integrating two N-Channel MOSFETs, the device includes fixed over-voltage protection of 27V (KTS1640) or 20.3V (KTS1641) along with over-temperature protection with auto-retry. Following an over-voltage condition only, KTS1640 and KTS1641 will automatically resume operation, when the over-voltage condition is removed.

An ENABLE pin allows the MOSFET switch to be enabled or disabled, placing the device in a low current shutdown mode. System monitoring is provided by a fault FLAG.

To inform the system that the battery or power supply is connected, BDET mirrors the input voltage less the drop across the reverse battery protection MOSFET and sources up to a maximum of 120mA

Further protection includes over-temperature shutdown and the input pin is fully ESD protected to comply with the IEC61000-4-2 (Level 4) specification.

The KTS1640 and KTS1641 are packaged in an advanced, fully green compliant, TDFN44-12 package.


  • Wide input operating range from 6V to 40V DC Input
  • Low resistance MOSFET Switch typ. 41mΩ
  • Reverse Battery Protection to -28V
  • Fixed over-voltage protection
    • Fixed: 27V ± 0.8V or 20.3V ± 0.8V
  • Fast OVP response time typ. 360ns
  • Continuous output current up to 6A
  • Over-temperature Protection with Auto-Retry
  • Open drain fault flag
  • Shutdown pin with low shutdown current
  • Voltage Input detection output
  • Input ESD protection to IEC61000-4-2 (Level 4)
    • Contact: ±8kV
    • Air: ±15kV
    • Other pins HBM: ±2kV
  • Pb-free TDFN44-12 package
  • -40°C to +85°C operating temperature range


  • Reverse Power Supply Protection
  • Telecom/Server/Networking System
  • Industrial and Medical Systems
  • Portable Instrumentation

Packaging Information

Package Dimensions Leads Package Code
TDFN44-12 4.00mm x 4.00mm 12 DV


Vin (min)  Vin (max)  ON Resistance (mΩ) Max Current (A) OVP Trip Point (V) OVP Turn Off Response Time (ns) IEC 61000-4-2 ESD (Air Discharge) IEC 61000-4-2 ESD (Contact Discharge)
6.0V 40V 41.0 6.0 27.0V 360 ±15kV ±8kV

Technical Documentation

Description Documents Type
Package Outline DrawingTDFN44-12 DV PODPDF

Evaluation Tools

Documents Type
KTS1640 User ManualPDF
KTS1640 Quick Start GuidePDF
KTS1640 Bill of MaterialsXLSX
KTS1640 SchematicPDF
KTS1640 3D BoardPDF


Part Number Marking Operating Temperature Package
KTS1640EDV-TR LXYWZ -40°C to +85°C TDFN44-12
KTS1641EDV-TR NAYWZ -40°C to +85°C TDFN44-12
Purchase Options
Buy from Digi-Key
Buy from Mouser