Welwyn Components has introduced metal element resistors in miniature surface-mount 1206 and 2010 sizes, delivering high surge-withstand capability and low parasitic inductance for precision current sensing in monitoring, control, protection and measurement circuits.

The 1-watt ULR1S in the 1206 outline and 1.5-watt ULR15S in the 2010 outline are available in ultra-low ohmic values from 1m Ω to 10m Ω, in 0.5m Ω increments up to 6m Ω. 7m Ω, 8m Ω, 9m Ω and 10m Ω values complete each series. The devices can be specified with either 1% or 5% tolerance, and have low temperature dependency of 50ppm/°C for consistent accuracy over a wide temperature range.

Combining high precision with very low ohmic values, these resistors maximise conversion efficiency and minimise the effect of sensing on the surrounding circuitry. A single ULR1S or ULR15S can replace multiple chip resistors of higher resistance in applications such as motor control, process control, switching circuits, lighting controls, power-conversion equipment, and safety systems.

The all-metal construction of these resistors also yields a wide operating temperature range, from –55°C to +170°C. This makes them an ideal choice for applications such as industrial and automotive.

More information: http://www.ttelectronics.com/