Widerstände zur Stromerfassung
Shunts von ROHM wurden über viele Jahre unter Einsatz von Metallverarbeitungstechnologien entwickelt, um sicherzustellen, dass sie mit einer Vielzahl an Anwendungen kompatibel sind: von tragbaren Geräten wie Smartphones über Automobilsysteme bis hin zu industriellen Systemen, die eine höhere Zuverlässigkeit erfordern. So konnte ROHM für das Widerstandselement eine spezielle hochleistungsfähige Legierung einsetzen, die eine hoch präzise Stromerfassung und hervorragende Temperatureigenschaften ermöglicht.
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Unterstützende Informationen
- Series Chart
- High Power, Ultra-low Ohmic: PSR series
- High Power, Low Ohmic: GMR series
- Ultra-low Ohmic: PMR series
- Ultra-low Ohmic, Wide Terminal type: PML series
- Low Ohmic, Face down type: UCR/UCRC series
- Low Ohmic, Wide Terminal type: LTR/LTRL series
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)
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)
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)
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)
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)
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)
