307C1403

* Electrode preheat thermistors for use in compact fluorescent lamps (CFL) and electronic ballasts.
* Current limiting, time-delayed start-up extends lamp life.
* Quiet, flicker-free operation.
* Developed in cooperation with leading ballast designers.
* Both standard and custom parts are available.
* Economical, reliable and proven in millions of lamps throughout the world.

* Ignition time can be optimized to increase life of lamp.
* PTC resistance (R₂₅) is chosen, along with filament resistance and application voltage, to control desired electrode preheat current.
* Lamp preheat time is determined by time required for thermistor to switch from low to high resistance state. Preheat currents shown result in switch times of approximately 1 second at  25°C.  Lower currents result in longer switch times.