EC35 Optical Commutation Kit Encoder

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  • EC35
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  • EC35_webproduct_01.jpg


  • Quick, simple assembly
  • A/B/Z differential outputs
  • U/V/W commutation outputs (differential or open-collector)
  • Frequency response from DC up to 1 MHz
  • 500 to 10,000 cycles per rev. (CPR)
  • 2,000 to 40,000 quadrature states per rev.
  • Fits shaft diameters from 0.197" (5mm) to 0.375" (3/8")
  • Single 5V supply

The EC35 quick assembly optical commutation encoder is designed for high volume, low cost, OEM motion control applications. The EC35 provides A/B/Z incremental outputs and U/V/W outputs for brushless motor commutation....

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Product Specifications

Operating Temperature -20 to 105
Vibration, 10Hz to 2kHz, sinusoidal 20  G
Shock, 6 millisecond, half-sine 75 G
Electrostatic Discharge, IEC 61000-4-2 ±12 kV
Codewheel Moment of Inertia   6.48 x 10-5 oz-in-s2
Required Shaft Length (for center hole encoder cover) 0.5 0.565 in.
Shaft Axial Play -0.003 0.003 in.
Mounting Shaft Total Runout - 0.001 in.
Acceleration - 250000 rad/sec²

Maximum RPM, CPR ≤ 2500
e.x. CPR = 2500, max. rpm = 9600


Maximum RPM, CPR = 4000   12000 RPM
Maximum RPM, CPR = 10000   6000 RPM
Base to Mounting Surface Screw Torque 3 in-lbs
Technical Bulletin TB1001 - Shaft and Bore Tolerances Download


Base/Housing 20% glass filled PBT
Codewheel Aluminum/Mylar
Supply Current
  CPR ≤ 2500
  CPR > 2500


no output load, max. frequency output
Supply Voltage 4.5 5.0 5.5 V
Differential High Level Output 2.5 3.5   V loh = -8 mA
Differential Low Level Output     0.5  V lol = 8 mA
Differential Rise/Fall Time   100   ns
Open collector pullup voltage     30 V lload = 100 mA
Open collector "on" resistance   0.2   ohm lload = 100 mA
Frequency Response,
CPR ≤ 2500
    400 kHz
Frequency Response,
CPR = 4000
    800 kHz  
Frequency Response,
CPR = 10000
    1 MHz  



Symmetry, S1, S2  108 180  252 elec. deg.
Quadrature Delay, Q  45 90  135 elec. deg.
Index Width, W  45 90  135 elec. deg.

A leads B for CCW shaft rotation, and B leads A for CW rotation viewed from the top side of the encoder.


State width, 4 pole  27 30  33 angular deg.
State width, 6 pole  17 20  23 angular deg.
State width, 8 pole  12 15  18 angular deg.
State width, 10 pole  9 12  15 angular deg.
State width, 12 pole  7 10  13 angular deg.


Pin"D" Output Option"C" Output Option"0" pole Option
1 A+ (A Quadrature) A+ (A Quadrature) A+ (A Quadrature)
2 A- A- A-
3 B+ (B Quadrature) B+ (B Quadrature) B+ (B Quadrature)
4 B- B- B-
5 Z+ (Index) Z+ (Index) Z+ (Index)
6 Z- Z- Z-
7 U+ (U Commutation) U (Open collector) no connection
8 U- no connection no connection
9 V+ (V Commutation) V (Open collector) no connection
10 V- no connection no connection
11 W+ (W Commutation) W (Open collector) no connection
12 W- no connection no connection
13 +5V power  +5V power +5V power
15 no connection  no connection no connection

Product Description

Restriction of Hazardous Substances

The EC35 quick assembly optical commutation encoder is designed for high volume, low cost, OEM motion control applications. The EC35 provides A/B/Z incremental outputs and U/V/W outputs for brushless motor commutation.  

The EC35 mounts to the motor using 2 screws on a 1.28" or 1.812" diameter bolt circle. The precision machined encoder hubdisk pushes on when the encoder assembly is put on the motor shaft. This design securely grips the shaft without set screws. A built in, removable spacer tool ensures that the encoder disk is automatically set to the correct gap when the encoder housing is mounted. The encoder can be "timed"  by rotating a ring on the assembly and pressing the ring in with a simple tool to lock everything into place.  

The EC35 is powered by a single 5V supply and comes with a 15-pin connector that provides differential outputs for A/B/Z and U/V/W. Open-collector U/V/W outputs are available as an option. Single ended output can be obtained by only using the + outputs of each differential pair. The internal 26C31 line drivers can source and sink 20 mA at TTL levels. The recommended differential receiver is the industry standard 26C32. Maximum noise immunity is achieved when the differential receiver is terminated with a 150 Ω resistor in series with a .0047 μF capacitor placed across each differential pair.

Please Note: Due to the EC35's push-on hub design, it is recommended for use as a one-time installation. 

Product Notes
  • Cables and connectors are not included and must be ordered separately.
  • US Digital® warrants its products against defects in materials and workmanship for two years. See complete warranty for details.

Cable/connector assembly not included and must be ordered separately.

Related Products & Accessories

Product Configuration

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1. CPR

2. Motor Poles

3. Bore

4. Index Gating

5. Output

6. Base

7. Packaging

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Quantity Unit Price
1 $115.00
5 $111.91
10 $108.82
50 $105.73
100 $102.64
Over 100 Call for Quote
Unit Price




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