LM393N datasheet by STMicroelectronics

LM393N Frequently Asked Questions (FAQs)

• What is the maximum voltage that can be applied to the input pins?
  The maximum voltage that can be applied to the input pins is the supply voltage (VCC) + 0.3V. Exceeding this voltage can cause damage to the device.
• How do I ensure the comparator output is stable and not oscillating?
  To ensure a stable output, add a small capacitor (e.g., 10nF) between the output pin and ground to filter out high-frequency noise. Additionally, ensure the input signals are clean and free from noise.
• What is the minimum input voltage difference required for the comparator to switch?
  The minimum input voltage difference required for the comparator to switch is typically around 1-2mV, but this can vary depending on the specific application and noise conditions.
• Can I use the LM393N as an amplifier?
  No, the LM393N is a comparator, not an amplifier. It is designed to compare two input voltages and output a digital signal indicating which input is higher. It is not suitable for amplifying signals.
• How do I protect the LM393N from electromagnetic interference (EMI)?
  To protect the LM393N from EMI, use a shielded enclosure, keep the input and output traces short, and add a ferrite bead or common-mode choke to the power supply lines.