S4T Features
- Small size
- Low cost
- High retention snap-in polarized connector
- -20C to 100C operating temperature
- 100 to 1,000 cycles per revolution (CPR)
- 400 to 4,000 pulses per revolution (PPR)
- 2-channel quadrature TTL square wave outputs
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 photodetector, and mylar disk. The encoder converts real-time shaft angle, speed, and direction into TTL-compatible quadrature outputs without index. It operates from a single +5VDC supply.
Three shaft torque options are available:
- 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.
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.
Mechanical Drawings
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
| 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 | 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 |
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
Notes
- Cables and connectors are not included and must be ordered separately.
- For ordering information please see the Compatible Cables / Connectors section above.
Configuration Options |
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| S4T | - | CPR (Cycles Per Revolution) 100 108 120 125 128 200 250 256 300 360 400 500 512 720 800 1000 | - | Shaft Diameter 125 (1/8") 236 (6mm) 250 (1/4") | - | Output S (Single-Ended) D (Differential) | - | Torque D (Default Torque) B (Ball Bearing) N (Light Static Drag) | ||||||||||||||||||||||||
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PLEASE NOTE: This chart is for informational use only. Certain product configuration combinations are not available. Visit the S4T product page for pricing and additional information. |
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