E4T Miniature Optical Kit Encoder

E4T Features

  • Push-on hub - spring loaded collet design
  • Minimum shaft length of .275 in.
  • Fits shaft diameters of .079 in. to .250 in.
  • 100 to 1,000 cycles per revolution (CPR)
  • 400 to 4,000 pulses per revolution (PPR)
  • Single +5V supply

See more info below

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E4T Product Description

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The E4T miniature transmissive optical encoder is designed to provide digital quadrature encoder feedback for high volume, limited space applications. The E4T is designed to be a drop-in replacement for the E4P that offers higher maximum speed and increased output drive. The E4T utilizes an innovative, push-on encoder disk that accepts shaft diameters of 2.0mm to .250 in.

The E4T miniature encoder base provides mounting holes for two #3-48, length 3/16 in. or two M2.5, length 4mm screws on a .586 in. bolt circle. The encoder cover is easily snapped onto the base and is marked with the connector pin-out.

The E4T series encoder is connected using a 4-conductor, high retention, polarized, 1.25mm pitch connector. Mating cables and connectors (see the Cables / Connectors web page) are not included and are available separately.

Please Note: Due to the E4T's push-on hub design, it is recommended for use as a one-time installation.

Product Specifications

View here or download the specifications

Environmental

PARAMETER VALUE UNITS
Operating Temperature -20 to 100 C
Electrostatic Discharge, IEC 61000-4-2
Single-ended (-S version)
Differential (-D version) 
± 12
± 7
kV
Shock, 6 millisecond, half-sine 75 G
Vibration (20Hz to 2kHz, sinusoidal) 20 G

Mechanical

PARAMETER VALUE UNITS
Max. Shaft Axial Play ± .010 in.
Max. Shaft Runout (TIR) .002 in.
Max. Acceleration 250,000 rad/sec²

Maximum RPM (1)
e.x. CPR = 300, max. rpm = 20000
e.x. CPR = 200, max. rpm = 30000

 minimum value of
(6000000/CPR)
and (60000)		 RPM
Max. Codewheel Moment of Inertia 5.1 x 10^-7 oz-in-s²
Mounting Screw Size
Default (D-option base)
Metric (M-option base)
#3-48 x 3/16"
M2.5, length 4mm		  
Screw Bolt Circle Diameter .586 ±.005 in.
Minimum Shaft Length (2) .275 in.
Maximum Shaft Length (2) .395 (D option) /
no limit (H 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 100kHz maximum output frequency is (6000000/CPR).

(2) Including axial play.

Single-Ended Electrical

SPECIFICATIONS MIN. TYP. MAX. UNITS NOTES
Supply Voltage 4.5 5.0 5.5 V  
Supply Current   25 30 mA CPR ≤ 500, no load
  34 42 mA CPR > 500, no load
Low-level Output     0.4 V CPR ≤ 500, IOL= 8 mA
CPR > 500, IOL= 5 mA
  0.035   V no load
High-level Output 2.4     V CPR ≤ 500, IOH= -8 mA
CPR > 500, IOH= -5 mA
  4.0   V no load
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 CPR ≤ 500, no load
  36 44 mA CPR > 500, no load
Single-Ended Output Voltage High 4.75 5.0   V Min. @ 25mA load, Typ. @ no load
Single-Ended 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  

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.

Pin-Out

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
(2) 6-pin differential mating connector is CON-MIC6

Options

H-OPTION (HOLE IN COVER)

The H-option adds a 0.295" diameter hole in the cover for the shaft to pass through.

M-OPTION (METRIC MOUNTING SCREWS)

Provides alternate metric M2.5, length 4mm screws. When M-option is NOT specified the default is #3-48 x 3/16" screws.

Accessories

1. Centering Tool*

Part #: MCTOOL - (Shaft Diameter)
Description: This reusable tool is used to accurately center the E4T base on the shaft.

2. Spacer Tool*

Part #: SPACER-E4T
Description: This reusable tool is used to properly space the codewheel from the encoder.

*Both the MCTOOL and SPACER-E4T tools are included with all packaging options.

3. Screws

Part #: SCREW-348-188-PH
Description: Pan Head, Philips #3-48 UNC x 3/16"
Use: Base Mounting
Quantity Required: 2
Screws are included with default base option

Part #: SCREW-M25-4MM-BH
Description: Button Head Cap, M2.5 x 0.45 x 4mm
Use: Base Mounting
Quantity Required: 2
Screws are included with metric base option

Product Change Notifications

Title Date Description Download
Updated PCB for E4T and S4T - PCN 6466 1/29/2018 This notice is to inform our customers of a PCB design change that is being implemented for all of the E4T and S4T product lines. The new PCBs will improve overall product performance and enhance robustness of these product lines. The new PCBs can be indentified by their blue color (instead of black) and have 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 either the E4T or S4T. Download
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. Download

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

Datasheets

Assembly Instructions

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