Low-value resistors for stable current monitoring in 0603-size
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.
The UCR series of low-ohmic chip resistors overcome a number of challenges in order to decrease chip size, such as maintaining low resistance values and tolerances while improving rated power. Rohm’s latest series uses new materials and a new, thick-film structure. In addition, heat dissipation is improved, and rated power is increased to 0.1W – twice that of conventional products; this reduces mounting area by 64% over conventional 0.1-W, 1005-size parts. Operating temperature range has also been expanded in the low-ohmic region to -55°C to 155°C, enabling compatibility with a greater variety of applications. Laser trimming makes it possible to achieve a resistance tolerance of ±1% (F Class), which has been traditionally difficult to realise at low resistances.
These new products have adopted the reverse-mount design used in the existing series in order to minimise resistance variations during soldering and ensure a temperature coefficient of resistance (TCR) between 0 and 300ppm/°C. This provides high-accuracy current detection.
Rohm; www.rohm.com/eu
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