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Susumu KRL Series Current-Sensing Resistors

Combining small package sizes and high power ratings

Susumu’s portfolio of low-resistance current-sensing chip resistors includes the KRL series, which features the highest power ratings for the size of the products.

The KRL series resistors’ construction uses foil as the resistive material, and a face-down structure with a ceramic substrate on top. The benefit of positioning the ceramic substrate at the top of the package is that it dissipates heat to the ambient air, while the terminals at the bottom dissipate heat to the board, thus eliminating hot spots. In addition, terminals at the bottom provide the shortest possible electrical path from the resistive body to the board connections, minimizing the device’s temperature coefficient of resistance.

The highly heat-conductive adhesive layer between the resistive foil and the ceramic substrate acts as a buffer for the stress created by the difference in temperature coefficient of expansion between the ceramic and a PCB’s FR-4 material. This means that the solder joint remains sound after thousands of temperature cycles.

The AEC-Q200 qualified KRL series resistors are offered in versions with terminals on the long or on the short side of the package, and as a precision four-terminal resistor. A low thermal electro-motive force type is also available.

KRL Series Features

  • Absolute tolerance of resistance: ±1%, ±2% or ±5%
  • Temperature coefficient of resistance: ±50ppm/oC, ±100ppm/oC or ±150ppm/oC
  • Range of resistance values: 1mΩ to 500mΩ
  • Rated power (long-side terminal products):
    • 0.5W in 0603 package
    • 1W in 0805 package
    • 1.5W in 1206 package
  • Low equivalent series inductance

KRL Series Applications

  • Automotive electronics
  • DC-DC and AC-DC converters
  • Motors
  • Inverters
  • Automation equipment
  • Motion control


Structure of Susumu KRL series resistors

Structure of KRL series resistors


Susumu KRL Series Heat Profiles

Heat profiles of 1W-rated resistors in 2512 package at full power