S4T Miniature Rotary Shaft Encoder

S4t Webproduct 01 Product Photo

S4T Features

  • Miniature incremental shaft encoder
  • 16 resolutions from 100 to 1,000 CPR (400 to 4,000 PPR)
  • Three shaft sizes: 1/8 in., 6 mm, 1/4 in.
  • Three torque options
  • Single-ended and differential output options
  • High retention polarized connector/cable (sold separately)

See more info below

Configure the S4T

US Digital S4T Miniature Shaft Encoder Description

Restriction of Hazardous Substances

The S4T miniature optical shaft encoder converts shaft position or speed into a quadrature output signal. This rotary encoder delivers up to 4000 PPR resolution in a compact package less than 1" in diameter. Available in 3 shaft sizes: 1/8 in., 6 mm, 1/4 in.

US Digital offers three different torque options for various uses: 

  • Default (-D): sleeve bushing with higher damping for human interface applications.

  • Ball bearing (-B): miniature precision ball bearings suitable for high-speed applications.

  • Light static drag (-N): sleeve bushing with lower damping for low-speed applications.

This incremental encoder is designed for use with a high-retention connector. After you make your selections in the Product Configurator, compatible cables and connectors will be displayed below and must be ordered separately.

Product 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
Vibration (10Hz to 2kHz, sinusoidal) 20 G
Shock (6 milliseconds, half-sine) 75 G

MECHANICAL

SPECIFICATION SLEEVE BUSHING BALL BEARING
Max. Acceleration 10000 rad/sec² 250000 rad/sec²
Max. Shaft Speed (1)
(mechanical)		 100 RPM 15000 RPM
Max. Shaft Torque 0.5 in-oz (D-option)
0.3 in-oz (N-option)		 0.05 in-oz (B-option)
Max. Shaft Loading 2 lbs. dynamic
20 lbs. static		 1 lb.
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.

(1) The maximum speed due to electrical considerations is dependent on the CPR. See the E4T product page.

PHASE RELATIONSHIP

 S4T Phase Relationship Diagram

PARAMETER MIN. TYP. MAX. UNITS
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 counterclockwise rotation viewed from the shaft side of the encoder.

SINGLE-ENDED ELECTRICAL

SPECIFICATIONS MIN. TYP. MAX. UNITS NOTES
Supply Voltage 4.5 5.0 5.5 V  
Supply Current   25
34		 30
42		 mA
mA		 CPR ≤ 500, no load
CPR > 500, no load
Low-level Output  


0.035		 0.4 V


V		 CPR ≤ 500, IOL= 8 mA
CPR > 500, IOL= 5 mA
no load
High-level Output 2.4


4.0		   V


V		 CPR ≤ 500, IOH= -8 mA
CPR > 500, IOH= -5 mA
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
36		 32
44		 mA
mA		 CPR ≤ 500, no load
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  

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

PRODUCT CHANGE NOTIFICATIONS

Title Date Description Download
E4T and S4T Cover and Base Update - PCN 7192 3/3/2022 As part of our ongoing continuous improvement efforts, and to avoid any potential disruption to our supply chain, US Digital has decided to standardize our plastic material. Based on this, the E4T and S4T encoder cover and base will change from PBT (Polybutylene Terephthalate) to PC (polycarbonate). 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 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 identified 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.

Related

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3D Model Downloads

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    Datasheet

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