E4P OEM Miniature Optical Kit Encoder
- Miniature size
- Push-on hub - spring loaded collet design
- Minimum shaft length of .375 in.
- Fits shaft diameters of .079 in. to .250 in.
- Accepts +/-.020 in. Axial shaft play
- Off-axis mounting tolerance of .010 in.
- 100 to 360 cycles per revolution (CPR)
- 400 to 1,440 pulses per revolution (PPR)
- Single +5V supply
See more info below
Configure the E4P
The E4P is no longer available for purchase.
E4P Product Description
The E4P miniature reflective encoder is designed to provide digital quadrature encoder feedback for high volume applications with limited space constraints. The E4P version utilizes an innovative, patented push-on encoder disk which accepts shaft diameters of 2mm to .250".
The E4P reflective encoder is the leader for high quantity OEM applications, but the E4 is the ideal choice when a set-screw encoder disk encoder is required (see the E4 page).
The E4P miniature encoder base provides mounting holes for two #3-48, length 1/4" or two M2.5x.45mm, length 6mm screws on a .586" bolt circle. When mounting holes are not available, a pre-applied transfer adhesive (with peel-off backing) is available for "stick-on" mounting.
The encoder cover is easily snapped onto the base and is embossed with the connector pin-out.
The E4P reflective series encoder can be connected by using a (high retention 4-conductor snap-in polarized 1.25mm pitch) connector. Mating cables and connectors (see the Cables / Connectors web page) are not included, and are available separately.
View here or download the specifications
|Vibration (5Hz to 2kHz)||20||G|
|Max. Relative Humidity||90||%|
|Storage Temperature||-40 to 100||C|
|Operating Temperature||-20 to 100||C|
|Electrostatic Discharge, IEC 61000-4-2
|Max. Shaft Axial Play||± .020||in.|
|Max. Off-axis Mounting Tolerance||± .010||in.|
|Mounting Screw Size
Default (D-option base)
Metric (M-option base)
#3-48 x 1/4"
M2.5x.45mm, length 6mm
|Screw Bolt Circle Diameter||.586 ±.002||in.|
|Axial Length of Codewheel||.270||in.|
|Required Shaft Length (1)||.375 to .395||in.|
|Mounting Screw Torque||2-3||in-lbs|
|Technical Bulletin TB1001 - Shaft and Bore Tolerances||Download|
(1) Includes axial play.
|Supply Current||21||27||mA||no load
|Low-level Output||0.4||V||IOL = 6 mA|
|High-level Output||2.4||V||IOH = -1 mA|
|Rise Time||500||ns||CL = 25 pF, RL = 2.7 kΩ|
|Supply Current||23||29||mA||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||1300||ns|
|Symmetry, S||180 ± 16||180 ± 75||electrical degrees|
|Quadrature Delay, Q||90 ± 10||90 ± 60||electrical degrees|
(1) A leads B for clockwise shaft rotation, B leads A for counter clockwise shaft rotation viewed from the cover/label 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.
H-option (Hole In Cover)
The H-option adds a hole in the cover for the shaft to pass through:
- For shaft diameters of 1.5mm to 1/8", a 0.170" hole is supplied.
- For shaft diameters of 5/32" to 1/4", a 0.295" hole is supplied.
M-option (Metric Mounting Screws)
Provides alternate metric M2.5x.45mm, length 6mm screws. When M-option is NOT specified the default is #3-48 x 1/4" screws.
T-option (Transfer Adhesive)
When mounting holes are not available, a pre-applied transfer adhesive (with peel-off backing) is available for "stick-on" mounting. Use the centering tool (above) to position the base. T-option specifies transfer adhesive.
Before installation, cleaning the mounting surface with alcohol is recommended to remove dust and oil.
1. Centering Tool
The centering tool is only included with the -3 packaging option. It has to be ordered separately for other package options.
Part #: MCTOOL - (Shaft Diameter)
Description: This reusable tool provides a simple method for accurately centering the E4P base onto the shaft. A centering tool is highly recommended when using the T-option transfer adhesive.
2. Spacer Tool
A spacer tool is included for all packaging options.
Part #: SPACER-E4P
Description: This reusable tool is used to properly space the codewheel from the encoder.
Product Change Notifications
|E4, E4P, S4 - PCN 5741||05/09/2016||As part of our on-going product lifecycle management process, we have identified products that will be transitioned to an "End-of-Life" status. Products targeted for end-of-life may be available for a last time buy option prior to being made obsolete, however quantities are limited and special requirements may apply.||Download|
|E4 - E4P - S4 Update - PCN 1014||11/29/2011||We have modifed the E4, E4P and S4 product lines in order to improve the performance and durability of the encoder. Changes include new molds for the plastic base and cover parts with an over-molded bushing in the S4 base, a new SMT connector (compatible with current mating connector)and a modified PCB profile to accommodate the new connector and plastic part modifications.||Download|
- 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.
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 E4P
This product is no longer configurable or available for new applications.
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