The AC5121 is China’s first TPMS sensor chip with fully independent intellectual property rights, designed for tire pressure monitoring in passenger and commercial vehicles. It complies with the Chinese TPMS standard **GB26194-2017** and is certified with **AEC-Q100 Grade 1.


Fully Integrated: The first domestic chip integrating a pressure sensor, dual-axis accelerometer, temperature sensor, and LF/RF module for high-performance tire pressure monitoring.  
Powerful Performance: Enhanced MCU with 5.2x faster processing than the standard 8051, featuring faster sensor sampling and computation.  
Low Power Consumption: Ultra-low sleep power of 150nA@Powerdown; overall power consumption under 6mA at 5dBm transmission power, with 5dBm and 8dBm options.  
Large Memory: Industry-leading 16k FLASH user program space with built-in 512 Bytes RAM.  
High Precision:  
Pressure accuracy: ±5kPa @ -40°C to 90°C  
Temperature accuracy: ±3°C @ -40°C to 125°C  
Acceleration accuracy: ±3g @ ±20g (Improved noise and sensitivity for adaptive positioning algorithms).  
High Reliability: Manufactured by a world-class MEMS foundry, ensuring stable quality and high reliability. Certified to AEC-Q100 Grade 1 automotive standards.