S6 Optical Shaft Encoder

S6 Features

  • Small size
  • 64 to 10,000 CPR (256 to 40,000 PPR)
  • Optional differential / line-driver output
  • Positive latching connector
  • 2-channel quadrature with optional index
  • Multiple Output Drive Options
  • Ball-bearing option tracks to 10,000 RPM
  • Wide operating temperature

See more info below

Configure the S6

S6 Product Description

Restriction of Hazardous Substances

The S6 series high resolution optical shaft encoder is a non-contacting rotary to digital converter. Useful for position feedback or manual interface, the encoder converts real-time shaft angle, speed, and direction into TTL-compatible quadrature outputs with or without index. It operates from a single +5VDC supply.

Three shaft torque versions are available:

  • The default torque version has a sleeve bushing designed to provide torque and feel ideal for front panel human interface applications.
  • The ball-bearing version uses miniature precision ball bearings that are suitable for high-speed and ultra-low torque applications.
  • The light static drag option has a sleeve bushing that does not intentionally add torque for low RPM applications where a small amount of torque is acceptable.

A secure connection to the S6 Series encoder is made through a 5-pin (single-ended versions) or 10-pin (differential or high-voltage versions) latching connector. The mating connectors are available from US Digital with several cable options and lengths.

The internal differential line driver (26C31) can source and sink 20mA at TTL levels for differential versions. The recommended receiver is the industry-standard 26C32. Maximum noise immunity is achieved when the differential receiver is terminated with a 150Ω resistor in series with a .0047 μF capacitor placed across each differential pair. The capacitor conserves power; otherwise, power consumption would increase by approximately 20mA per pair or 60mA for three pairs.

Product Specifications


Parameter Value Units
Operating Temperature, CPR < 2000 -40 to 100 C
Operating Temperature, CPR ≥ 2000 -25 to 100 C
Electrostatic Discharge 
Single-ended (S option), IEC 61000-4-2
Differential (D, L option), Human Body Model
High-Voltage, Open-collector (H, C option), IEC 61000-4-2

± 4
± 2
± 4
Vibration (10Hz to 2kHz, sinusoidal) 20 G
Shock (6 milliseconds, half-sine) 75 G


Max. Acceleration 250000 rad/sec² 250000 rad/sec²
Max. Shaft Speed (mechanical) 100 rpm (1) 10000 rpm (1)
Max. Shaft Torque 0.5 ± 0.2 in-oz
0.3 in-oz (N-option)
0.05 in-oz
Max. Shaft Loading 2 lbs. dynamic
20 lbs. static
1 lb.
Bearing Life > 1000000 revolutions L10 = (19.3/Fr)³ *
Where L10 = bearing life in millions of revs, and
Fr = radial shaft loading in pounds
  Single-ended (S option)
  Differential (D option)
  High-Voltage, Open-Collector (H, C option)

1.92 oz.
2.00 oz.
2.00 oz.

1.78 oz.
1.86 oz.
1.86 oz.
Max. Shaft Runout 0.0015 in. T.I.R. 0.0015 in. T.I.R.
Max. Panel Nut Tightening Torque 20 in-lbs 20 in-lbs
Technical Bulletin TB1001 - Shaft and Bore Tolerances Download

* Only valid with negligible axial shaft loading.

(1) The maximum speed due to electrical considerations is dependent on the CPR. See the EM1 and EM2 product pages.


B leads A for clockwise shaft rotation, and A leads B for counterclockwise rotation when viewed from the shaft side of the encoder.


  • S option provides 5V TTL compatible outputs
  • Specifications apply over the entire operating temperature range
  • Typical values are specified at Vcc = 5.0Vdc and 25°C
  • For complete details, see the EM1 and EM2 product pages
Supply Voltage 4.5  5.0 5.5 V  
Supply Current   27 33 mA CPR < 1000, no load 
  54 62 mA CPR ≥ 1000 and < 3600, no load
  72 85 mA CPR ≥ 3600, no load
Low-level Output     0.5 V IOL = 8mA max., CPR < 3600
    0.5 mA IOL = 5mA max., CPR ≥ 3600
  0.05   mA no load, CPR < 3600
  0.25   mA no load, CPR ≥ 3600
High-level Output 2.0     V IOH = -8mA max., CPR < 3600
2.0     V IOH = -5mA max., CPR ≥ 3600
  4.8   V no load, CPR < 3600
  3.5   V no load, CPR ≥ 3600
Output Current Per Channel -8   8 mA CPR < 3600
-5   5 mA CPR ≥ 3600
Output Rise Time   110   nS CPR < 3600
  50   nS CPR ≥ 3600
Output Fall Time   35   nS CPR < 3600
  50   nS CPR ≥ 3600


  • D Option provides differential line driver outputs
  • Specifications apply over the entire operating temperature range
  • Typical values are specified at Vcc = 5.0Vdc and 25°C
  • For complete details, see the EM1 and EM2 product pages
Supply Voltage 4.5 5.0 5.5 V
Supply Current   29 36 mA CPR < 1000, no load 
  56 65 mA CPR ≥ 1000 and < 3600, no load
  74 88 mA CPR ≥ 3600, no load
Low-level Output   0.2 0.4 V IOL = 20mA max.
High-level Output 2.4 3.4   V IOH = -20mA max.
Differential Output Rise/Fall Time     15  nS  


  • H option uses a higher supply voltage and provides both single-ended and open-collector outputs
  • Single-ended outputs are 5V TTL compatible (same as S option)
  • Specifications apply over the entire operating temperature range
  • For complete details, see the EM1 or EM2 product pages
Supply Voltage 7.5   30.0 V  
Supply Current, 24V power   8 10 mA CPR < 500, no load
  16 19 mA CPR ≥ 500 and < 2000, no load
  22 25 mA CPR ≥ 2000, no load
Open Collector "On" Resistance   2   ohms  
Open Collector Sink Current     200 mA  
Output Low Voltage     0.4 V 200 mA sink current
Open Collector Pullup Voltage     50 V  



Pin Description Pin Description
1 Ground 1 Ground
2 Index 2 Ground
3 A channel 3 Index-
4 +5VDC power 4 Index+
5 B channel 5 A- channel
    6 A+ channel
    7 +5VDC power
    8 +5VDC power
    9 B- channel
    10 B+ channel


Pin Description
1 Ground
2 Ground
3 Index- (open collector)
4 Index+ (single-ended)
5 A- channel (open collector)
6 A+ channel (single-ended)
7 7.5-30V power
8 7.5-30V power
9 B- channel (open collector)
10 B+ channel (single-ended)


(1) 5-pin single-ended mating connector is CON-FC5.
(2) 10-pin differential mating connector is CON-FC10.


Title Date Description Download
Marketing/Insert - PCN 7058 11/04/2020 As part of our ongoing continuous improvement efforts, improvements are being incorporated into the E6, S6 and H6 series of Optical Encoders, including both single-end and differential output versions. Download
Laser Marking - PCN 5253 6/17/2015 As part of our ongoing continuous improvement efforts, US Digital is changing the labeling/marking method for our E3, E6, H3, H6, S1, S2 and S6 products. Download
EM1 & EM2 Update - PCN 4199 1/14/2014 Based on our continuous process improvement program, US Digital is changing the current marking method for our EM1 and EM2 encoder modules to a serialization method. This change will allow for each module to have a unique code; the current marking method is based on a date code system that includes all encoder modules produced within a specific week / year. The serialization system will be based on a hexadecimal system. Download
EM1 LED Die - PCN 1016 2/7/2013 As part of US Digital's continual assurance of supply strategy, we have qualified additional sources for our LED die used in our EM1 encoder module, which in turn impacts all of the following products:

EM1, E2, E3, E5, E6, H1, H15, H3, H5, H6, HB5M, HB6M, HD25, PE, S1, S2, S5, S6, T5 and T6

The device specification will remain the same, i.e. there will be no change to form, fit or function of the product(s) as specified by US Digital. The appropriate quality and reliability testing has been performed on representative products to ensure normal parametric distribution, consistent with US Digital's quality and reliability standards.

Additional Information

Product Notes

  • Cables and connectors are not included and must be ordered separately.
  • For ordering information please see the Compatible Cables / Connectors section above.
  • US Digital® warrants its products against defects in materials and workmanship for two years. See complete warranty for details.
  • For ordering information please configure the product and you'll see the Compatible Cables / Connectors section above.


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