GCR glueable chip resistor family from 0805 to 2512 sizes target high-temperature, high-reliability and non-magnetic electronics

ULW series wire-wound resistors overcome the problems associated with conventional flameproof resistors which can experience delays in fusing resulting in momentary loud flashovers. The UL-recognised ULW resistors, however, eliminate flashovers to fuse safely and silently, normally in a fraction of a second, and will not burn under any applied temperature or power overload condition.

Available in surface-mount or standard through-hole packages, resistance values range from 10 to 100Ω, with power ratings of 2W, 3W and 4W. ULW series resistors are designed to withstand inrush and surge conditions, operate in temperatures from -55 to +155°C and are classified to climatic category 55/200/56 according to IEC 68-1.

New HTCR chip resistors from TT electronics Welwyn Components, are qualified for operation up to 250°C and are compatible with wire-bonding, adhesive and soldering assembly. In addition to conventional high-temperature applications, such as down-hole, automotive, defence and aerospace equipment, non-magnetic versions of the HTCR chip resistors are compatible with medical MRI scanner applications. With no organic materials, HTCR resistors can also be used in high-vacuum space and scientific equipment.

Compared to conventional thick-film resistors, the PWC series provides 50% more power in the standard 0805, 1206, 2010 and 2512 case sizes without sacrificing surge and voltage withstand performance. With power ratings of 0.125W, 0.33W, 0.75W and 1.5W, these resistors reduce space and cost, and enhance stability, in applications with demanding surge and pulse requirements. With limiting element voltages of 400V and 500V, the 2010- and 2512-cased PWC resistors also double the working voltage compared to conventional chip alternatives. Typical applications include power supplies, circuit protection devices portable battery chargers, motor controls and line-powered equipment.

Applications for the HVP series include image intensifiers for night vision equipment, industrial test equipment, and medical applications in portable defibrillators and power supplies for x-rays. TT electronics’ combination of IRC and Welwyn offers one of the most comprehensive ranges of high-voltage resistors. The range provides safety in discharge, reliability in balancing and accuracy in measurement across the high-voltage range from 1 to 100kV.