US Digital E8T Motor Encoder Description The US Digital E8T miniature motor encoder mounts directly to a motor or other rotating shaft. This incremental encoder uses a specially patterned optical disk on a precision-machined aluminum hub.
This disk, in combination with a custom detector, creates a system highly tolerant to mechanical misalignment. A push-on hub design and a robust, glass-filled polymer housing provide easy installation in space-limited applications.
The E8T mini motor encoder offers 9 available resolutions and compatibility with 10 shaft sizes, 3 base configurations, and 2 cover styles, enabling it to fit a wide range of applications. Users can choose between single-ended or differential outputs.
This optical encoder is designed for use with a high-retention connector. After making each selection in the Product Configurator, compatible cables and connectors will be displayed below and must be purchased separately.
Please Note : Due to the E8T's design, it is recommended for use as a one-time installation.
Product Specifications
ENVIRONMENTAL
PARAMETER
VALUE
UNITS
Operating Temperature
-20 to 100
C
Electrostatic Discharge, IEC 61000-4-2
Vibration (10Hz to 2kHz, sinusoidal)
20
G
Shock (6 milliseconds, half-sine)
75
G
MECHANICAL
PARAMETER
VALUE
UNITS
Max. Shaft Axial Play
± .010
in.
Max. Shaft Runout
0.002 T.I.R.
in.
Max. Acceleration
250000
rad/sec²
Maximum RPM (1)
Maximum A/B Frequency
minimum value of
100
RPM
kHz
Codewheel Moment of Inertia
1.789 x 10^-6
oz-in-s²
Mounting Screw Size
Screw Bolt Circle Diameter
Minimum Shaft Length (2)
0.295
in.
Maximum Shaft Length (2)
0.400 (D option) /
in.
Mounting Screw Torque
2-3
in-lbs
Technical Bulletin TB1001 - Shaft and Bore Tolerances
Download
(1) 60000 RPM is the maximum rpm due to mechanical considerations. The maximum RPM due to the module's maximum frequency response is dependent upon the module’s resolution (CPR).
(2) Including axial play.
PHASE RELATIONSHIP
PARAMETER
MIN.
TYP.
MAX.
UNITS
Symmetry, S
105
180
255
electrical degrees
Quadrature Delay, Q
30
90
150
electrical degrees
(1) A leads B for clockwise shaft rotation, B leads A for counter-clockwise shaft rotation viewed from the cover side of the encoder.
(2) Typical values represent the encoder performance at typical mounting alignment, whereas the maximum values represent the encoder performance across the range of recommended mounting tolerance.
SINGLE-ENDED ELECTRICAL
SPECIFICATIONS
MIN.
TYP.
MAX.
UNITS
NOTES
Supply Voltage
4.5
5.0
5.5
V
Supply Current
25
30
mA
no load
Low-level Output
0.4
V
IOL = 8 mA
High-level Output
2.4
V
IOH = -8 mA
Output Rise Time
100
ns
no load
Output Fall Time
50
ns
no load
DIFFERENTIAL ELECTRICAL
SPECIFICATIONS
MIN.
TYP.
MAX.
UNITS
NOTES
Supply Voltage
4.5
5.0
5.5
V
Supply Current
27
32
mA
no load
Differential Output Voltage High
4.75
5.0
V
Min. @ 25mA load, Typ. @ no load
Differential Output Voltage Low
0.25
0.60
V
Typ. @ no load, Max. @ 4.5mA load
Differential Output Voltage
3.0
3.8
V
RL = 100 ohm
Differential Output Rise/Fall Time
20
ns
PIN-OUTS
4-PIN SINGLE-ENDED (1)
6-PIN DIFFERENTIAL (2)
Pin
Description
Pin
Description
1
+5VDC power
1
Ground
2
A channel
2
A channel
3
Ground
3
A- channel
4
B channel
4
+5VDC power
5
B channel
6
B- channel
(1) 4-pin single-ended mating connector is CON-MIC4 CON-MIC6
OPTIONS
H-OPTION (HOLE IN COVER)
The H -option adds a 0.425" diameter hole in the cover for the shaft to pass through.
M-OPTION (METRIC MOUNTING SCREWS WITH DEFAULT BASE)
Provides metric M2.5, length 5mm screws. When M -option is NOT specified the default is #4-40, length 0.188" screws. The mounting bolt circle diameter is 0.75"
G-OPTION (1.28" DIAMETER BOLT CIRCLE MOUNT)
Provides 1.28" diameter bolt circle mount in addition to 0.75" diameter bolt circle mount. Screws are #4-40, length 0.188"
ACCESSORIES
1. Centering Tool*
Part #: CTOOL - (Shaft Diameter) Description: This reusable tool is used to accurately center the E8T base on the shaft.
2. Spacer Tool*
Part #: SPACER-E8T Description: This reusable tool is used to properly gap the codewheel from the encoder sensor.
*Both the CTOOL and SPACER-E8T tools are included with all packaging options.
3. Screws
Part #: SCREW-440-188-PH
Part #: SCREW-M25-5MM-PH
PRODUCT CHANGE NOTIFICATIONS
Title
Date
Description
Download
E4T, E8T Packaging - PCN 7195
2/16/2022
As part of our ongoing continuous improvement efforts, US Digital is implementing a change to our packaging options for
Download
Updated PCB on the US Digital E8T - PCN 6514
5/16/2018
This notice is to inform our customers of a PCB design change that is being implemented for the entire E8T product line. As part of our continuous improvement objective, the new PCB will improve overall product performance and enhance the robustness of this product line. The new PCB has two mounting holes that mate with the base plate instead of one hole and one slot. This change has no impact on form, fit or function for the E8T.
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E4T, S4T, and E8T Laser Markings - PCN 6227
8/8/2017
This notification is to inform our customers of a change to product markings for the E4T, E8T, and S4T series of encoders. The new marking will be utilized across all three product lines. We are making this change to improve readability for our customers and to provide consistency across the product lines.
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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.
Assembly Instructions & Videos
Press Releases
Related
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
STEP Format
Datasheet
Feedback
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Save Your Configuration
Easily keep track of your custom part numbers
What is this feature?
While configuring your encoder, you can save your custom part number at any stage. This helps you keep track of multiple configurations without needing to start over or write anything down.
How does it work?
Click “Add This Configuration to Your List” after selecting your options.
Your saved part number will appear in a mini list below the configurator.
The list is stored locally in your browser and persists across product pages.
Enter a quantity to view default pricing.
What can you do with saved configurations?
When you're ready, visit the Saved Configurations List page to:
Review all saved part numbers
Fill out a form to send your selections to US Digital Customer Service
Receive follow-up to complete your order or get support
Why use it?
Save time by avoiding repeated configurations
Compare multiple part numbers side-by-side
Simplify communication with our support team
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