E8T Miniature Optical Kit Encoder

E8T Features

Push-on hub - spring loaded collet design
Minimum shaft length of .295 in.
Fits shaft diameters of .118 in. to .375 in.
180 to 720 cycles per revolution (CPR)
720 to 2,880 pulses per revolution (PPR)
Single +5V supply

See more info below

Configure the E8T

E8T Product Description

The E8T transmissive optical encoder is designed to provide digital quadrature encoder feedback for high volume, compact space applications. The E8T is designed to be a drop-in replacement for the E7P/E8P and offers higher maximum speed and increased output drive. The E8T utilizes an innovative, push-on code wheel that accepts shaft diameters of .118 in. to .375 in.

The E8T default encoder base provides mounting holes for two #4-40, length 0.188 in. or two M2.5, length 5mm screws on a 0.75 in. bolt circle diameter. A 1.28 in. diameter bolt circle mount is also available, only with #4-40, length 0.188 in. screws. The encoder cover is easily snapped onto the base and is marked with the connector pin-out.

The single-ended output version is connected using a 4-conductor, high retention, polarized, 1.25mm pitch connector. The differential output version uses a similar 6-pin connector. Mating cables and connectors (see the Cables/Connectors web page) are not included and are available separately.

Please Note: Due to the E8T's design, it is recommended for use as a one-time installation.

Product Specifications

ENVIRONMENTAL

PARAMETER	VALUE	UNITS
Operating Temperature	-20 to 100	C
Electrostatic Discharge, IEC 61000-4-2 Single-ended (-S option) Differential (-D option)	± 12 ± 7	kV
Vibration (10Hz to 2kHz, sinusoidal)	20	G
Shock (6 milliseconds, half-sine)	75	G

MECHANICAL

PARAMETER	VALUE	UNITS
Max. Shaft Axial Play	± .010	in.
Max. Shaft Runout	0.002 T.I.R.	in.
Max. Acceleration	250000	rad/sec²
Maximum RPM (1) Maximum A/B Frequency e.x. CPR = 200, Max. RPM = 30000	minimum value of ((6 x 10^6)/CPR) and (60000) 100	RPM kHz
Codewheel Moment of Inertia	1.789 x 10^-6	oz-in-s²
Mounting Screw Size Default (D-option), 1.28" base (G-option) Metric (M-option)	#4-40 x 3/16 M2.5 x 5	in. mm
Screw Bolt Circle Diameter Default (D-option), Metric (M-option) 1.28" base (G-option)	0.75 ±0.005 1.28 ±0.005	in.
Minimum Shaft Length (2)	0.295	in.
Maximum Shaft Length (2)	0.400 (D option) / no limit (H option)	in.
Mounting Screw Torque	2-3	in-lbs
Technical Bulletin TB1001 - Shaft and Bore Tolerances		Download

(1) 60000 RPM is the maximum rpm due to mechanical considerations. The maximum RPM due to the module's maximum frequency response is dependent upon the module’s resolution (CPR).

(2) Including axial play.

PHASE RELATIONSHIP

PARAMETER	MIN.	TYP.	MAX.	UNITS
Symmetry, S	105	180	255	electrical degrees
Quadrature Delay, Q	30	90	150	electrical degrees

(1) A leads B for clockwise shaft rotation, B leads A for counter-clockwise shaft rotation viewed from the cover 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.

SINGLE-ENDED ELECTRICAL

SPECIFICATIONS	MIN.	TYP.	MAX.	UNITS	NOTES
Supply Voltage	4.5	5.0	5.5	V
Supply Current		25	30	mA	no load
Low-level Output			0.4	V	I_OL = 8 mA
Low-level Output		0.035		V	no load
High-level Output	2.4			V	I_OH = -8 mA
High-level Output		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	no load
Differential Output Voltage High	4.75	5.0		V	Min. @ 25mA load, Typ. @ no load
Differential 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-OUTS

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

OPTIONS

H-OPTION (HOLE IN COVER)

The H-option adds a 0.425" diameter hole in the cover for the shaft to pass through.

M-OPTION (METRIC MOUNTING SCREWS WITH DEFAULT BASE)

Provides metric M2.5, length 5mm screws. When M-option is NOT specified the default is #4-40, length 0.188" screws. The mounting bolt circle diameter is 0.75"

G-OPTION (1.28" DIAMETER BOLT CIRCLE MOUNT)

Provides 1.28" diameter bolt circle mount in addition to 0.75" diameter bolt circle mount. Screws are #4-40, length 0.188"

ACCESSORIES

1. Centering Tool*

Part #: CTOOL - (Shaft Diameter)
Description: This reusable tool is used to accurately center the E8T base on the shaft.

2. Spacer Tool*

Part #: SPACER-E8T
Description: This reusable tool is used to properly gap the codewheel from the encoder sensor.

*Both the CTOOL and SPACER-E8T tools are included with all packaging options.

3. Screws

Part #: SCREW-440-188-PH
Description: Pan Head, Philips #4-40 UNC x 3/16"
Use: Base Mounting
Quantity Required: 2
Screws are included

Part #: SCREW-M25-5MM-PH
Description: Pan Head, Phillips M2.5 x 0.45 x 5mm
Use: Base Mounting
Quantity Required: 2
Screws are included

PRODUCT CHANGE NOTIFICATIONS

Title	Date	Description	Download
E4T, E8T Packaging - PCN 7195	2/16/2022	As part of our ongoing continuous improvement efforts, US Digital is implementing a change to our packaging options for our E4T and E8T kit encoders.	Download
Updated PCB on the US Digital E8T - PCN 6514	5/16/2018	This notice is to inform our customers of a PCB design change that is being implemented for the entire E8T product line. As part of our continuous improvement objective, the new PCB will improve overall product performance and enhance the robustness of this product line. The new PCB has 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 the E8T.	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.

3D Model Downloads

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