The analog sensors are packaged in the Tape & Reel (TR) for safety reasons. Analog sensors are protected from damage by being placed in 20-TSSOP (0.173, 4.40mm Width) packages. To ensure proper operation, this sensor has 20 pins. Sensor voltage should be 5.5V in DC circuits. Although in a DC circuit, the minimum voltage supplied by this magnetic switch can be 3V. When operating, the analog sensors could supply 5.5V voltage. The board has 20 pins.