Bedlington, UK TT electronics Welwyn Components has developed a family of high reliability chip resistors with a resistance range to 50 G ohms. Designated the HR series , this resistor range is ideal for applications that require very high feedback division ratio in high gain amplifiers for instrumentation, test & measurement and medical equipment. The range of chips offers the designer low voltage coefficient of resistance and is available in four standard sizes 0503, 0805, 1005 and 1206. With a resistance range from 10M to 50G, the high resistance value of these devices is such that power dissipation is always small, so they are rated only in terms of maximum voltage. TCRs are available at 0 to -2500 ppm/°C with limiting element voltages of 50 V, 100 V, 150 V and 200 V. The operating temperature range is -55°C to +125°C, with a resistance tolerance to 5%. TT electronics / Welwyn Components Ltd , Bedlington, UK. www.ttelectronics.com.