In order to ensure safety, these analog sensors are packaged in the Tube. A 20-TSSOP (0.173, 4.40mm Width) package protects analog sensors from damage. For the proper operation of this sensor, there are 20 pins. In DC circuits, this sensor's maximum output voltage should be 5.5V. But the minimum voltage supplied by this magnetic switch can be 3V in the DC circuit. When it operates, analog sensors can provide 5.5V voltage. Pin number 20 is on it.