Tiny integrated Temperature Sensor & Brushless DC Fan Controller with Over-Temperature Alert (TC650 / TC651) Tiny integrated Temperature Sensor & Brushless DC Fan Controller Tiny integrated Temperature Sensor & Brushless DC Fan Controller with Over-Temperature Alert The TC650/651 are integrated temperature sensors and brushless DC fan speed controllers. The TC650/651 measure their junction temperature and control the speed of the fan based on that temperature, making them especially suited for applica