The rankings are as follows:
1: Infineon (Germany) : is one of the world's top ten semiconductor manufacturers, specializing in automotive system chips, electrostatic discharge (ESD) and surge protection.
2: ST Semiconductor: Main motor driver chip, high voltage driver chip, intelligent power switch, power line communication IC, etc.
3: Sijia News: main RF and wireless semiconductor.
4: NXP: Main audio amplifier, energy management, RF and so on.