Low-Ohmic High Power Chip Resistors for Current Detection Applications


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Low-Ohmic High Power Chip Resistor for Current Detection Applications

ROHM Semi conductor has recently announced a new series of resistors called the LTR50. These resistors come in a compact 2550 size (2.5mm × 5.0mm × 0.55mm) with a wattage rating as high as 2W and resistance values between 10mΩ to 910mΩ. These small package resistors comes in high wattage rating and also helps in improving energy saving and reducing the size of the circuit which makes it suitable to be used in high power application including inverters and other power efficient appliances.


This new series of resistors are available in 48 values. Since the element structure is optimized the resistor claims to have the best Temperature Coefficient of Resistance* (TCR). This means that the value of resistor does not get alerted easily for change in temperature around it, this property helps in measuring the value of current flowing through it accurately.

ROHM Low Ohmic High Power Chip Resistor LTR50 dimensions


Key Features:

1. Superior temperature coefficient of resistance (TCR) ensures high accuracy current detection

2. 4x higher rated power than conventional products contributes to greater space savings

Part No:

Size code mm (inch)

Rated Power (70°C)


TCR (ppm/°C)

Resistance Range

Operating temperature

Automotive grade (AEC-Q200)


2550 (1020)


J (±5%)


0 to 300
0 to 200
0 to 150

10mΩ to 18mΩ (E24 Series)
20mΩ to 47mΩ (E24 Series)
51mΩ to 91mΩ (E24 Series)
100mΩ to 910Ω (E24 Series)

-55 to +155



* Temperature Coefficient of Resistance (TCR)

The internal resistance of many materials changes in response to variations in temperature. This rate of change is called the temperature coefficient of resistance, or TCR. The lower this value is, the less the resistance change due to a change in ambient temperature, making it possible to suppress variations during device operation.

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