E6 Optical Kit Encoder

E6 Features

  • Quick, simple assembly and disassembly
  • Rugged screw-together housing
  • Positive latching connector
  • Accepts .010 in. axial shaft play
  • 64 to 10,000 cycles per revolution (CPR)
  • 256 to 40,000 pulses per revolution (PPR)
  • 2 channel quadrature TTL squarewave outputs
  • Optional index (3rd channel)
  • Fits shaft diameters from 2mm to 1 in.

See more info below

Configure the E6

E6 Product Description

Restriction of Hazardous Substances

The E6 Series rotary encoder has a rugged glass-filled polymer enclosure which utilizes either a 5-pin or 10-pin latching connector. This optical incremental encoder is designed to easily mount to and dismount from an existing shaft to provide digital feedback information.    

The internal components consist of a mylar disk mounted to a precision machined aluminum hub and an encoder module. The module contains a highly collimated solid state light source and monolithic phased array sensor, which together provide a system extremely tolerant to mechanical misalignments.

The single-ended output version (S-option) is typically used with cables of 10 feet or less. For longer cable lengths, the differential output version (D-option) is recommended.

Attachment of the base to a surface may be accomplished by utilizing one of several machine screw bolt circle options. Positioning of the base to the centerline of a shaft is ensured by use of a centering tool. The cover is securely attached to the base with two 4-40 flat head screws to provide a resilient package protecting the internal components.

A secure connection to the E6 Series encoder is made through a 5-pin (single-ended versions) or 10-pin (differential versions) latching connector. The mating connectors are available from US Digital with several cable options and lengths.

Product Specifications

View here or download the specifications


Operating Temperature (CPR < 3600) -40 to 100 C
Operating Temperature (CPR ≥ 3600) -25 to 100 C
Vibration (5Hz to 2kHz) 20 G
Electrostatic Discharge 
Single-ended (-A, -S version), IEC 61000-4-2
Differential (-D, -L version), Human Body Model

± 4
± 2



Max. Shaft Axial Play ±0.010 in.
Max. Shaft Eccentricity Plus Radial Play (1) 0.004 in.
Max. Acceleration 250000 rad/sec²
Max. RPM (2) (CPR ≤ 2500)
e.x. CPR=2500, max. rpm=7200
e.x. CPR=100, max. rpm=60000
minimum value of ((18 x 10^6) / CPR) and (60000) RPM
Max. RPM (2) (CPR > 2500 and ≤ 5000)
e.x. CPR=4096, max. rpm=5273
(21.6 x 10^6) / CPR RPM
Max. RPM (2) (CPR > 5000)
e.x. CPR=10000, max. rpm=4320
(43.2 x 10^6) / CPR RPM
Typical Product Weight
Single-Ended (S-option)
Differential (D-option, L-option)


Codewheel Moment of Inertia 8.9 x 10^-5 for bore < 12mm
4.0 x 10^-4 for bore ≥ 12 mm
Hub Set Screw #3-48 or #4-48  
Hex Wrench Size 0.050 in.
Encoder Base Plate Thickness 0.135 in.
3 Mounting Screw Size #0-80  
2 Mounting Screw Size #2-56 or #4-40  
3 Screw Bolt Circle Diameter (3) 0.823 ± 0.005 in.
2 Screw Bolt Circle Diameter 0.750 ± 0.005 in.
Required Shaft Length (4)
  With E-option (3)
  With H-option
0.445 to 0.570
0.445 to 0.750
> 0.445
Index Alignment to Hub Set Screw 180 Typical mechanical degrees

Torque Specifications

Hub Set Screw to Shaft 2-3 in-lbs
Cover (4-40 screws through cover into base) 2-4 in-lbs
Base to Mounting Surface 4-6 in-lbs
Base to Mounting Adapter Plate 4-6 in-lbs
Adapter Plate to Mounting Surface 4-6 in-lbs
Module to Base 3.5-4 in-lbs

Phase Relationship

Single-Ended (S) / Differential (D) Option:

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

Broadcom / Avago compatible pin-out (A, L) Option:

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

Single-ended Electrical

  • Specifications apply over 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
mA no load, CPR < 3600
mA no load, CPR ≥ 3600
High-level Output 2.0     V IOH = -8mA max., CPR < 3600

V IOH = -5mA max., CPR ≥ 3600

4.8   V no load, CPR < 3600

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

Differential Electrical

  • Specifications apply over 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  


5-pin Single-ended (1)10-pin Differential, Standard (2)10-pin Differential (L-option) (2)(3)10-pin Single-ended (A-option) (2)(3)
1 Ground 1 Ground 1 No connection 1 A channel
2 Index 2 Ground 2 +5VDC power 2 +5VDC power
3 A channel 3 Index- 3 Ground 3 Ground
4 +5VDC power 4 Index+ 4 No connection 4 No connection
5 B channel 5 A- channel 5 A- channel 5 No connection
    6 A+ channel 6 A+ channel 6 Ground
    7 +5VDC power 7 B- channel 7 +5VDC power
    8 +5VDC power 8 B+ channel 8 B+ channel
    9 B- channel 9 Index- 9 +5VDC power
    10 B+ channel 10 Index+ 10 Index

(1) 5-pin single ended mating connector is CON-FC5.
(2) 10-pin differential mating connector is CON-FC10.
(3) Broadcom / Avago compatible version.



Provides a single pulse per revolution.


3-option makes all five of these hole diameters .125".

View option:




The E-option provides a cylindrical extention to the cover allowing for longer shafts of up to .750".

Please note: Only available for shaft diameters <.472".

View option:




The H-option adds a hole to the cover for the shaft to pass through.

  • Shafts 2mm to 10mm, a .438" diameter hole is supplied.
  • Shafts 12mm to 1", a 1.047" diameter hole is supplied.
View option:




Provides Avago / Agilent / HP differential compatible pin-out. See direct replacement information above.


This adapter plate is for mounting to a 3" diameter bolt circle. 

View option:



When mounting holes are not applicable, a pre-applied transfer adhesive mounting option is available.

Instructions: The T-option includes transfer adhesive with a peel-off backing on the encoder base. First, peel the paper backing from the transfer adhesive. Next, align the centering tool with the center hole on the non-adhesive side of the encoder base. Slide the base (adhesive side down) with the centering tool over the motor shaft and press firmly to form a solid bond between the encoder base and mounting surface. Remove the centering tool and continue with the standard assembly. You are required to use the centering tool with the T-option to ensure proper placement.

View option:




1. Centering Tool

The centering tool is only included with the -3 packaging option. It has to be ordered separately for other packaging options.

Part #: CTOOL - (Shaft Diameter)
Description: This reusable tool provides a simple method for accurately centering the E6 base onto the shaft. It is recommended for the following situations:

  • When using mounting screws smaller than #4-40.
  • When the position of the mounting holes is in question.
  • When using the 3-hole mounting pattern.
  • When using the T-option transfer adhesive.

Instructions: When mounting encoder base, slide centering tool down shaft until it slips into centering hole of encoder base. Tighten mounting screws, then remove centering tool.

2. Hex Tool

Depending on the order packaging option, either a hex driver or hex wrench is included.

Part #: HEXD-050
Hex driver, .050" flat-to-flat for #3-48 or #4-48 set screws. Only included with -B or -1 packaging options.

Part #: HEXW-050
Description: Hex wrench, .050" flat-to-flat for #3-48 or #4-48 set screws. Only included with -2 or -3 packaging options.

3. Spacer Tool

A spacer tool is included for all packaging options.

Part #: SPACER-E6S
Description: For shaft sizes < 0.472"

Part #: SPACER-E6L
Description: For shaft sizes 12mm to 1"

4. Screws

Screws for base mounting must be purchased separately. Screws for mounting the housing to the base are included.

Part #: SCREW-080-250-PH
Description: Pan Head, Philips #0-80 UNF x 1/4"
Quantity Required for Mounting: 3 per encoder

Part #: SCREW-256-250-PH
Description: Pan Head, Philips #2-56 UNC x 1/4"
Quantity Required for Mounting: 2 per encoder

Part #: SCREW-440-250-PH
Description: Pan Head, Philips #4-40 UNC x 1/4"
Quantity Required for Mounting: 2 per encoder

Avago Direct Replacement

Avago Direct Replacement:

US Digital's E6 encoder may now be used as a direct replacement for the following Avago encoders:

HEDL-6500, HEDL-6505, HEDL-6540, HEDL-6545.
HEDM-6500, HEDM-6505, HEDM-6540, HEDM-6545.
HEDS-6500, HEDS-6505, HEDS-6540, HEDS-6545.

Product Change Notifications

2" Hub/Disk Assembly Screw Change - PCN 6644 9/27/2018 As part of our ongoing continuous improvement efforts, the screws used in the assembly of the 2" hub/disk assembly, that is with a bore of 12mm and larger, will be changed from a black oxide to a zinc plated screw.

The zinc plating improves corrosion resistance as well as alleviates any potential for oil residue.

The plating change has no effect on form, fit or function of our hubdisk assembly.
Update to 1" and 2" Disks - PCN 6232 5/24/2018 This notice is to inform our customers of a minor disk design modification that is being implemented for standard 1" and 2" disks. This is a continuation of a change that was implemented for our index disks in 2015.

We are revising the text on the disk, adding the US Digital logo and a line that is used internally by our manufacturing group.

The change does not effect the quadrature or index tracks; therefore, it has no impact on form, fit or function.
Hub Set Screw Production Change - PCN 5367 7/20/2015 As part of our ongoing continuous improvement efforts, US Digital is implementing a change related to the production of our 5/16" (.313), 8mm (.315), 3/8" (.375), and 10mm (.394) HUBDISK assemblies. We are adding a low strength threadlocker to the set screw during our assembly process to assist in securing the set screw in the hub during transportation. This will aid in the set screw retention of these specific hub sizes; ensuring the retention is sufficient and avoid the potential of them backing out of the hub assembly during transit. This change does not affect form, fit or function. 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.
  • US Digital® warrants its products against defects in materials and workmanship for two years. See complete warranty for details.

Downloads Available




3D Model Downloads

Please configure your product first to download a 3D model.
(Note: The formats below will become links if there are 3D models available.)

    • SolidWorks format
    • IGES format
    • Parasolid format

    Related Products & Accessories

    The following are related products for the E6

    Product Configurator

    For pricing, this product requires configuration.

    Begin by completing either Option 1 or 2 below. Questions? Contact our support team.

    Option 1: Configure the Product

    Use the configuration tool to provide information regarding your product needs. Not sure what to do or need additional assistance? Our support team is here to help.

    We recommend enabling Javascript when using the product configurator.

    1. CPR

    2. Bore

    3. Index

    4. Output

    5. Cover

    6. Base

    7. Packaging

    Option 2: Enter the Product Part Number Directly

    If you know your product part number, enter it in the following field. The part number format looks something like this: E5-5000-394-IE-S-D-D-3...

    E6 Pricing

    Quantity Unit Price
    1 $61.95
    5 $54.93
    10 $52.53
    50 $50.13
    100 $47.73
    Over 100 Call for Quote
    Quantity Unit Price Subtotal
    $61.95 $61.95

    For purchasing or volume discounts, please configure the part above, then use the completed part number and contact us!


    US Digital's mission is a commitment to quality and constant improvement. If you find an error to a product on this page, please let us know!