Providing design engineers with miniature devices designed for general encoding of low speed applications, TT electronics OPTEK Technology has developed a family of single- and dual-channel incremental encoders. Designated the OPE1275 single-channel (tachometer) and OPE2275 dual-channel encoders, the analog output encoders are designed for small shaft motors with a diameter of 2mm (0.079”) and a minimum length of 3.8mm (0.150”). The encoders feature 256 pulses per revolution, with a maximum of 5,000 RPM. “These incremental encoders are the least expensive encoders available in their size range on the market today, by as much as $40 each,” said Alan Bennett, vice president of sales for OPTEK Technology. “The encoders also feature extended capabilities in that the single-channel device features a rise and fall pulse, providing two slopes for each pulse, thus doubling the count capability; while the rise and fall pulse of the OPE2275 encoder is in a quadrature pattern, providing design engineers four times the pulse-per-revolution count.”

Typical applications for the single- and dual-channel encoders include printer motors, machine automation, and machine safety.
The OPE1275 encoder provides a single-channel analog output for speed of rotation, while the OPE2275 device provides a dual-channel analog output for speed and direction of rotation. Electrical connection is achieved via a 4-pin Molex 53048-0410 connector providing V+, ground and output pins. The mating connector is a 4-pin Molex 51021-0400 (Terminal pin 50058 or 50079) or equivalent.
The extended shaft versions of the OPE1275 and OPE2275 encoders are fully assembled and ready for immediate connection. Mounting of the hollow shaft version of the encoders is achieved with a stick-on transfer adhesive pre-applied to the back of the housing.
Frequency response ranges from DC to 25kHz, providing a maximum of 256 cycles per revolution (CPR) and 1024 quadrature states per revolution (PPR). Typical rise and fall times are 500ns and 100ns, respectively. Supply voltage (VCC) is 5.0, while supply current (ICC) is 21mA. Operating temperature ranges from 0°C to +85°C.


• Moment of Inertia: Dimensions: 6.48 X 10-5; Units: OZ-IN-S2 • Shaft Length: Dimensions: 0.3 to 0.7; Units: Inches
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