S2 Optical Shaft Encoder
S2 Product Description
The S2 series high resolution optical shaft encoder is a non-contacting rotary to digital converter. Useful for position feedback or manual interface, the encoder converts real-time shaft angle, speed, and direction into TTL-compatible quadrature outputs with or without index. It operates from a single +5VDC supply.
The S2 is our first generation ball bearing optical shaft encoder and is available for those customers who have designed it into their products; however, the S6 is recommended for new designs in place of the S2.
Three shaft torque versions are available. The standard torque version has a sleeve bushing designed to provide torque and feel that is ideal for front panel human interface applications.
The no torque added option has a sleeve bushing that does not intentionally add torque for low RPM applications where a small amount of torque is acceptable.
The ball bearing version uses miniature precision ball bearings that are suitable for high speed and ultra low torque applications.
Connection to the S2 series encoder is made through a 5-pin standard connector. The mating connectors are available from US Digital with several cable options and lengths.
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, IEC 61000-4-2
|Parameter||Sleeve Bushing||Ball Bearing|
|Max. Acceleration||250000 rad/sec²||250000 rad/sec²|
|Max. Shaft Speed (mechanical)||100 rpm (1)||10000 rpm (1)|
|Max. Shaft Torque||0.5 ±0.2 in-oz
0.3 in-oz (N-option)
|Max. Shaft Loading||2 lbs. dynamic
20 lbs. static
|Bearing Life||> 1000000 revolutions||L10 = (19.3/Fr)³ *
Where L10 = bearing life in millions of revs, and
Fr = radial shaft loading in pounds
|Weight||1.28 oz.||1.28 oz.|
|Max. Shaft Total Indicated Runout||0.0015 in.||0.0015 in.|
|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.
B leads A for clockwise shaft rotation, and A leads B for counterclockwise rotation when viewed from the shaft side of the encoder.
- 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 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|
|0.05||mA||no load, CPR < 3600|
|0.25||mA||no load, CPR ≥ 3600|
|High-level Output||2.0||V||IOH = -8mA max., CPR < 3600|
|2.0||V||IOH = -5mA max., CPR ≥ 3600|
|4.8||V||no load, CPR < 3600|
|3.5||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|
Product Change Notifications
|S2 Housing Update – PCN 6935||1/13/2020||US Digital is implementing a redesign of the plastic housing components. The design changes are primarily an alteration of surface drafts and orientation of the housing components relative to each other. The new housing is dimensionally equivalent without any impact to form, fit or function within the envelope of the previous design.||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|
|EOL Sealed Housing Option - PCN 1021||4/11/2013||This PCN is a formal notification that US Digital is discontinuing the Sealed Housing option for the
|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
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.
- Cables and connectors are not included and must be ordered separately.
- For ordering information please see the Compatible Cables / Connectors section above.
- 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
- STEP format
Related Products & Accessories
The following are related products for the S2
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