The PT8A329xB is a mixed signal CMOS LSI chip designed as PTC heating controller with help of external NTC (Negative Temperature Component). NTC open protection is implemented for device safety. This device can be used in both 120V and 240V power line supplier, as it will automatically adjust the heating power according to the power line voltage to avoid heating appliance damage or long heating time.

The PT8A329xB also has the same drive method in both 120V and 240V, on the other hand, it enlarges the heating cycle, and it has advantage for high power PTC heating product to pass the flicker test. The proportional control algorithm is designed in this product.