Low-value resistors for stable current monitoring in 0603-size

August 07, 2014 // By Graham Prophet
100 mΩ chip resistors for current detection contributes to greater miniaturisation and energy savings; Rohm Semiconductor has developed these low-ohmic chip resistors specifically optimised for current detection applications in compact equipment such as smartphones and wearable devices.

The UCR006 series of ultra-compact (0.6 x 0.3 mm) thick-film chip resistors is offered in resistances as low as 100 mΩ. They are also the first 0603-size resistors to ensure a temperature range of -55 to 155°C in the low-ohmic region, and feature twice the rated power compared with competitor products in the same size, enabling support for a wide range of applications. This higher power handling capability in a smaller size makes them ideal replacements for larger 1005-size resistors.

Resistances exceeding 100 mΩ are typically used for this task; to minimise power loss during current detection it is important to use the smallest resistance value possible – while also providing sufficient power rating to ensure reliable performance.