Profile: RTI Electronics, Inc. designs, manufactures, & sells thermistor, magnetic, and film capacitor products. We also produce a broad line of PTC thermistor products, and a full line of magnetics, including current transformers & sensors, inductors, & power transformers. Positive temperature co-efficient (PTC) thermistors are thermally sensitive semiconductor resistors which exhibit an increase in resistance at a specified temperature. Change in the resistance of a PTC thermistor can be brought about either by a change in the ambient temperature, or internally, by self heating resulting from current flowing through the device. Most of the practical applications of PTC thermistors are based on these material characteristics. We provide disc style thermistors in resistance values ranging form 1.0 to 1500 ohms @25°C, and switching temperatures (Ts) of 40 to 120°C. The maximum operating voltage (Vmax) available is 350V DC. Our audio film capacitor is made of metallized polypropylene capacitors in non-inductive construction. It may be operated at rated voltage from -55°C to + 85°C. Voltage must be de-rated linearly to 60% between +85°C to +105°C.