Are 5V Input Signal Drives Compatible with 3.3V?

Regarding the logic input level compatibility of our stepper drives, please refer to the following clarification:

Through rigorous testing and validation, our two new drive models, CL57Y-20 and CL86Y-V20, can stably recognize 3.3V pulse (PUL) and direction (DIR) signals. This is an officially supported feature, and you can find this information listed under key features and in comparison charts on their respective product pages.

For other stepper drive models not mentioned above, while their technical datasheets do not list 3.3V level compatibility as an official standard, some controller interfaces might achieve basic communication in practical applications. However, it is crucial to note that this compatibility has a clear reliability limit: the drive's high-level recognition threshold is close to 3.3V. This means that any minor power ripple, line voltage drop, or interference causing the input voltage to drop (for example, to 3.1V or below) could result in the pulse signal failing to be reliably recognized. This may lead to stability risks such as lost drive commands or unexpected motor stoppage.

Therefore, based on the highest consideration for long-term product reliability and the stability of your system, we strongly recommend: For all drive models other than the CL57Y-20 and CL86Y-V20, please prioritize using the standard 5V logic level for control signals. The 5V level provides an adequate safety margin for signal recognition, fundamentally and effectively resisting voltage fluctuations and ensuring absolute stability of the control system under various complex operating conditions.

Updated on: 30/09/2025