ROHM Parametric

Current Detection Resistors

Current Detection Resistors

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      Supporting Information

       

      Shunt Resistors Series Chart

      Shunt Resistors Series Chart

      High Power, Ultra-low Ohmic: PSR series (Rated Power: 3W to 15W, Resistance: 0.1mΩ to 3mΩ)

      Key Features

      The PSR series are high power shunt resistors covering the ultra-low ohmic (0.1mΩ) region.
      The resistors adopt a convex shape using precision welding technology to minimize heat generation and achieve higher rated power, making them ideal for current detection in large current circuits that demand superior accuracy.

      Applications

      Automotive (EPS, battery monitoring, HVAC)
      Industrial (power conditioners, server power supplies, base stations, ESS)
      Large appliances (Air-conditioner, refrigerators)

      PSR series Product Lineup

      Series ChartHigh Power, Ultra-low Ohmic: PSR series

      High Power, Low Ohmic: GMR series (Rated Power: 4W to 10W, Resistance: 5mΩ to 220mΩ)

      Key Features

      The GMR series of high power shunt resistors are characterized by high heat dissipation and superior reliability.
      Optimizing the heat dissipation pathway makes it possible to ensure higher rated power in a compact form factor.

      Applications

      Automotive (ECUs, EFI, motor peripheral circuits)
      Industrial (FA equipment, motor peripheral circuits, power supplies)
      Large appliances (Air-conditioner, washing machine, refrigerators)

      GMR series Product Lineup

      High Power, Low Ohmic: GMR series

      Ultra-low Ohmic: PMR series (Rated Power: 0.2W to 8W, Resistance: 0.5mΩ to 10mΩ)

      Key Features

      The PMR series of ultra-low-ohmic shunt resistors are available from 1mΩ.
      The proprietary trim-less structure prevents heat concentration, reducing temperature rise, while low inductance makes high-accuracy current detection possible.
      The lineup includes a broad range of sizes to suit a variety of applications, and also features high-power variants that achieve ultra-low resistance starting from 0.5mΩ.

      Applications

      Notebook PCs, portable devices
      Consumer electronics
      Automotive (EPS, power supplies, motor detection circuits)
      Industrial (inverters, power tools, base stations)

      PMR series Product Lineup

      Ultra-low Ohmic: PMR series

      Ultra-low Ohmic, Wide Terminal type: PML series (Rated Power: 0.66W to 3W, Resistance: 0.5mΩ to 2.5mΩ)

      Key Features

      The PML series of metal plate type ultra-low-ohmic chip resistors features a wide terminal design that improves heat dissipation and reliability,
      making them ideal for large current high-speed switching circuits.

      Applications

      Notebook PCs, DC-DC converters
      Automotive (i.e. car audio, ETC)

      PML series Product Lineup

      Low Ohmic, Face down type: UCR/UCRC series (Rated Power: 0.1W to 2W, Resistance: 10mΩ to 910mΩ)

      Key Features

      The UCR/UCRC series are low-ohmic chip resistors that adopt a backside mounting structure to suppress resistance fluctuations.
      The UCRC series utilizes a metal resistive element formed through sintering. This design delivers a compact form factor, high-power capability, and low TCR (Temperature Coefficient of Resistance), enabling replacement with a smaller package size.

      Applications

      Automotive (Main Inverters, BMS, DC-DC Converters)
      Industrial (V2H, motor detection circuit, power supplies)
      Consumer Electronics (Notebook PCs, HDD, mobile phones)

      UCR/UCRC series Product Lineup

      Low Ohmic, Face down type: UCR/UCRC series

      Low Ohmic, Wide Terminal type: LTR/LTRL series (Rated Power: 1W to 4W, Resistance: 10mΩ to 1000mΩ)

      Key Features

      The LTR/LTRL series are thick-film, low-ohmic chip resistors available from 10mΩ that adopt a wide terminal type to improve joint reliability and heat dissipation, while their higher rated power enables replacement with a smaller size.

      Applications

      Automotive (LED headlamps, motor peripheral circuits, power supplies)
      Industrial (base stations, FA equipment, motor peripheral circuits, power supplies)
      Consumer Electronics (Notebook PCs, Air-conditioner, washing machine)

      LTR/LTRL series Product Lineup

      Low Ohmic, Wide Terminal type: LTR/LTRL series