S4T Miniature Optical Shaft Encoder
S4T Product Description
The S4T miniature optical shaft encoder is a non-contacting rotary to digital converter. The S4T contains an LED light source, monolithic photo detector and mylar disk. The S4T encoder is available with a shaft bushing or ball bearings for motion control applications, or with shaft torque designed to feel like a potentiometer for front-panel manual interfaces. The encoder converts real-time shaft angle, speed, and direction into TTL-compatible quadrature outputs without index. It operates from a single +5VDC supply.
The S4T uses 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
|Operating Temperature||-20 to 100||C|
|Electrostatic Discharge, IEC 61000-4-2
Single-ended (-S version)
Differential (-D version)
|Shock, 6 millisecond, half-sine||75||G|
|Vibration (20Hz to 2kHz, sinusoidal)||20||G|
|Specification||Sleeve Bushing||Ball Bearing|
|Max. Acceleration||10000 rad/sec²||250000 rad/sec²|
|Max. Shaft Speed||100 rpm||15000 rpm for CPR < 500 |
((6 x10^6) / CPR) rpm for CPR ≥ 500
|Max. Shaft Torque||0.5 ±0.2 in-oz (D-option) |
0.3 in-oz (N-option)
|Max. Shaft Loading||2 lbs. dynamic |
20 lbs. static
|Bearing Life||> 1000000 revolutions||L10 = (22/Fr)³ * |
Where L10 = bearing life in millions of revs, and
Fr = radial shaft loading in pounds
|Weight||0.48 oz.||0.43 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.
|Symmetry, S||105||180||255||electrical degrees|
|Quadrature Delay, Q||30||90||150||electrical degrees|
(1) B leads A for clockwise rotation, A leads B for counter clockwise rotation viewed from the shaft side of the encoder.
|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|
|High-level Output||2.4||V||CPR ≤ 500, IOH= -8 mA|
|CPR > 500, IOH= -5 mA|
|Output Rise Time||100||ns||no load|
|Output Fall Time||50||ns||no load
|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|
Product Change Notifications
|PCN 7163 - ED3 Firmware Update||6/30/2014||
As part of our ongoing continuous improvement efforts, US Digital is implementing a firmware change to the ED3 Digital Encoder
Part Numbers Affected:
|PCN 4464 - CE - RoHS||6/30/2014||
US Digital is aware of the increasing attention to world-wide environmental regulations, specifically with regard to the need for hazardous substance restrictions in electronic components and systems. As of July 10th, 2014 US Digital will now be CE Marking certain products inline with compliance under RoHS Directive (2011/65/EU). In order to achieve RoHS Compliance, the products will not contain more than the acceptable levels of the listed restricted substances within the RoHS 2011/65/EU directive.
Part Numbers Affected:
For the part numbers listed above, US Digital cannot confirm that they meet Low-Voltage and EMC Directives and for that reason US Digital cannot support shipping those products / product families into the CE required countries (For Example countries in the EU). Those products can still be shipped to Non-CE required countries with a Statement of Material Conformance to the RoHS Directive 2011/65/EU, in place of a RoHS Compliance Declaration.
- Cables and connectors are not included and must be ordered separately.
- For ordering information please see the Compatible Cables / Connectors section above.
- View Shaft and Bore Tolerances - TB1001
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
Related Products & Accessories
The following are related products for the S4T
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