For projects that need a rotary encoder but require a single-sided design or need to avoid interrupting traces or devices on the other side, the Surface Mount Rotary Encoder EC11J is an excellent choice. This high-quality 30-detents encoder from Alps features a smooth bushing suitable for mounting in an enclosure.The encoder includes a built-in push-button allowing the knob to be pressed to close a separate switch. It features a 3-pad connector (ground and two coding pins) on one side and two pads for a normally open switch on the other. The encoder also has 6 large mechanical pads for a robust physical connection, recommended to be used with a ground plane for mechanical stability.Unlike potentiometers, this rotary encoder rotates continuously with 30 distinct segments, each providing a tactile 'click'. Movement clockwise or counter-clockwise changes the two switches' states, enabling microcontrollers to count rotation increments. The current position is not directly readable; thus, microcontroller tracking is necessary. For absolute position detection, consider using a potentiometer instead.Features: 30 detents with a clicky feel Integrated push-button switch Single-sided SMT design Smooth bushing for enclosure mounting Robust mechanical pads for secure soldering Alps high-quality rotary encoder Technical Specifications: 15mm long flat shaft 30 detents Press-switch travel: 1.5mm Operating life: 100,000 cycles Operating temperature range: -40℃ to +85℃ Electrical rating: 10mA 5V DC Output signal: A, B, 2-phase output Max/min operating current (resistive load): 10mA / 1mA Insulation resistance: 100MΩ min. (250V DC) Withstand voltage: 300V AC for 1 minute or 360V AC for 1s Detent torque: 12±5mN·m (initial), 10±4mN·m (after reflow) Shaft push and pull strength: 100N Journey: 0.5±0.3mm Action force: 5±2N Download Datasheet (PDF)Note: Knob is not included but can be purchased separately.
