Yl105 Datasheet !link! Jun 2026

| | Likely Cause | Solution | |-------------|------------------|---------------| | Relay does not click | No power on VCC | Check 5V and GND connections. | | Relay clicks but load doesn’t turn on | Wrong wiring (NC vs NO) | Load should be connected to COM and NO. | | Random toggling | Floating input pin | Use a pull-down (active HIGH) or pull-up (active LOW) resistor (10kΩ). | | Microcontroller resets when relay activates | Power supply insufficient | Relay coil draws ~80mA. Use a separate 5V supply for module. | | Jumper setting ignored | Poor contact | Remove/insert jumper multiple times or solder the desired connection. |

: In the Alpha Wire catalog, this often denotes a specific packaging size, such as a package of five 4-foot lengths : Common parts include F2211/2 YL105 (1/2" diameter) and F2211IN YL105 (1" diameter). Applications and Features Versatility yl105 datasheet