EC21A Ring-Type Encoders

Alps Alpine EC21A Ring-Type Encoders feature a 10mA, 5VDC electrical rating and a two-phase A and B output signal. These encoders offer 100MΩ 250VDC insulation resistance with an available 9/18 or 15/30 pulse/detent count. Alps Alpine EC21A Encoders measure 21.6mm x 21.6mm x 4mm while the actuators measure 15mm in length. Alps Alpine EC21A Ring-Type Encoders withstand 50,000 life cycles and can operate in temperatures ranging from -40°C to +85°C. 

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Description Datasheet Availability Pricing (CRC) Filter the results in the table by unit price based on your quantity.
Qty. RoHS ECAD Model Series
Mounting Style
Product
Type
Resolution
Technology
Number of Detents
Number of Channels
Termination Style
Output Type
Shaft Type
With Switch
Operating Supply Voltage
Life
Packaging
Alps Alpine Encoders 15Pulses / 30Detent / 16mNm / 15mm (Long shaft)
Datasheet
521In Stock
Min.: 1
Mult.: 1

EC21A PCB Mount Ring Encoders Incremental 15 PPR Mechanical 30 Detent 2 Channel PC Pin Quadrature Ring Without Switch 5 VDC 50000 Cycles Tray
Alps Alpine Encoders 5 Volts Through Hole 230In Stock
Min.: 1
Mult.: 1

EC21A PCB Mount Ring Encoders Incremental 9 PPR Mechanical 18 Detent 2 Channel PC Pin Quadrature Ring Without Switch 5 VDC 50000 Cycles Tray
Alps Alpine Encoders 18 Detent 9 Pulse 15mm Actuator
Datasheet
167In Stock
600On Order
Min.: 1
Mult.: 1

EC21A PCB Mount Ring Encoders Incremental 9 PPR Mechanical 18 Detent 2 Channel PC Pin Quadrature Ring Without Switch 5 VDC 50000 Cycles Tray
Alps Alpine Encoders 30 DETENT 15-PULSE
Datasheet
2In Stock
1 200Expected 10/16/2026
Min.: 1
Mult.: 1

EC21A PCB Mount Ring Encoders Incremental 15 PPR Mechanical 30 Detent 2 Channel PC Pin Quadrature Ring Without Switch 5 VDC 50000 Cycles Tray
Alps Alpine Encoders 5 Volts Through Hole 549In Stock
Min.: 1
Mult.: 1

EC21A PCB Mount Ring Encoders Incremental 15 PPR Mechanical 30 Detent 2 Channel PC Pin Quadrature Ring Without Switch 5 VDC 50000 Cycles Tray