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Bourns ENA1PB28L00128L Quadrature Optical Encoder

The Bourns ENA1P-B28-L00128L is a compact rotary optical encoder designed for applications requiring precise angular position feedback. It utilizes a 2-bit quadrature output to provide directional information, with a resolution up to 256 cycles per revolution. The encoder's ball bearing option enables operation at speeds up to 3000 rpm, making it suitable for demanding industrial and automation applications. It is RoHS compliant and offers a wide operating temperature range, ensuring reliable performance in various environments. The encoder's small size and compatibility with both CMOS and TTL systems make it a versatile choice for a wide range of applications.

Authorized Distributors
Source:DigiKey
Part No:ENA1P-B28-L00128L
Stock:94
Inv Date:05-28-2026
Price: Unit price: $55.9
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Part No:ENA1P-B28-L00128L
Stock:54
Inv Date:05-29-2026
Price: Unit price: $55.68
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Part No:ENA1P-B28-L00128L
Stock:0
Inv Date:05-28-2026
Price: Unit price: $47.79
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Part No:ENA1P-B28-L00128L
Stock:68
Inv Date:05-28-2026
Price: Unit price: $55.49
Buy/RFQ:
Part No:ENA1P-B28-L00128L
Stock:68
Inv Date:05-28-2026
Price: Unit price: $55.49
Buy/RFQ:

Bourns ENA1PB28L00128L Quadrature Optical Encoder Specifications:

  • Resolution: 25 to 256 cycles per revolution
  • Insulation Resistance: 1,000 megohms
  • Electrical Travel: Continuous
  • Supply Voltage: 5.0 VDC ±0.25 VDC
  • Supply Current: 26 mA maximum
  • Output Voltage Low: 0.8 V maximum
  • Output Voltage High: 4 V minimum
  • Output Current Low: 25 mA minimum
  • Rise/Fall Time: 200 ns (typical)
  • Shaft RPM (Ball Bearing): 3,000 rpm maximum
  • Power Consumption: 136 mW maximum
  • Pulse Width (Electrical Degrees, Each Channel): 180 º ±45 º typ.
  • Pulse Width (Index Channel): 360 º ±90 º
  • Phase (Electrical Degrees, Channel A to Channel B): 90 º ±45 º typ.
  • Operating Temperature Range: -40 ºC to +75 ºC
  • Storage Temperature Range: -40 °C to +85 °C
  • Mechanical Angle: 360 °
  • Continuous Torque (A & C Bushings): 1 N-cm (1.5 oz-in.) maximum
  • Continuous Torque (W, S & T Bushings): 0.07 N-cm (0.1 oz-in.) maximum
  • Mounting Torque: 1.7 to 2.0 N-m (15 to 18 lb.-in.) maximum
  • Shaft End Play: 0.30 mm (0.012 ”) T.I.R. maximum
  • Shaft Radial Play: 0.12 mm (0.005 ”) T.I.R. maximum
  • Weight: 11 gms. (0.4 oz.)

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You can download the ENA1PB28L00128L datasheet or visit the Bourns website for support.

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Bourns

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