News and New Products

Resistors keep their cool, even when the system doesn’t

By Bill Schweber -- EDN, 8/8/2005

Targeting operation in not-so-benign environments, new chip resistors, voltage dividers, and resistor networks from the IRC Division of TT Electronics meet all critical specs, over the –65 to +200°C range. The PFCD-HT SMT voltage dividers come in a1206 package, and the TaN (tantalum-nitrogen)-film-based PFC-HT chip resistors come in 0603, 0805, and 1206 packages. The 1900HT and 4700HT DIP and SIP networks are available in a variety of nominal values to match application needs.

The voltage dividers have absolute tolerance of ±1% and temperature coefficient as low as ±25 ppm/°C with ratio tolerances to ±0.1% and tracking to ±5 ppm/°C over the full temperature range. Specifications for the chip resistors and DIP/SIP networks are similar (Picture). Power rating for the dividers is 125 mW; for the chip resistors, it spans 62.5 to 125 mW, depending on value. For the DIP networks it is slightly greater than 1W, and, for the SIP network it is 0.24 to 0.32W. Prices range from $1 to $5.

IRC Inc, TT Electronics PLC, www.irctt.com.