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Features

■

Two channel quadrature output

■

Bushing or servo mount

■

Square wave signal

■

Small size

■

Resolution to 256 PPR

■

CMOS and TTL compatible

■

Long life

■

Ball bearing option for high operating

speed up to 3000 rpm

■

RoHS compliant*

EN - Rotary Optical Encoder

Electrical Characteristics

Output ................................................................................... 2-bit quadrature code, Channel A leads Channel B by 90 º (electrical) with clockwise rotation

Resolution............................................................................................................................................................................... 25 to 256 cycles per revolution

Insulation Resistance (500 VDC) .................................................................................................................................................................. 1,000 megohms

Electrical Travel .....................................................................................................................................................................................................Continuous

Supply Voltage.........................................................................................................................................................................................5.0 VDC ±0.25 VDC

Supply Current.............................................................................................................................................................................................. 26 mA maximum

Output Voltage

Low Output .................................................................................................................................................................................................0.8 V maximum

High Output.....................................................................................................................................................................................................4 V minimum

Output Current

Rise/Fall Time ..................................................................................................................................................................................................200 ns (typical)

Shaft RPM (Ball Bearing) ....................................................................................................................................................................... 3,000 rpm maximum

Power Consumption .................................................................................................................................................................................. 136 mW maximum

Pulse Width (Electrical Degrees, Each Channel) ............................................................................................................................................180 º ±45 º typ.

Pulse Width (Index Channel) ................................................................................................................................................................................. 360 º ±90 º

Phase (Electrical Degrees, Channel A to Channel B)........................................................................................................................................90 º ±45 º typ.

Environmental Characteristics

Operating Temperature Range .......................................................................................................................................-40 ºC to +75 ºC (-40 °F to +167 °F)

Storage Temperature Range ..........................................................................................................................................-40 °C to +85 °C (-40 °F to +185 °F)

Humidity................................................................................................................................................................. MIL-STD-202, Method 103B, Condition B

Vibration ............................................................................................................................................................................................................................ 5 G

Shock............................................................................................................................................................................................................................... 50 G

Rotational Life

A & C Bushings (300 rpm maximum)** ............................................................................................................................................10,000,000 revolutions

W, S & T Bushings (3,000 rpm maximum)** ..................................................................................................................................200,000,000 revolutions

IP Rating ..........................................................................................................................................................................................................................IP 40

Mechanical Characteristics

Mechanical Angle ........................................................................................................................................................................................ 360 ° Continuous

Torque (Starting and Running)

A & C Bushings (Spring Loaded for Optimum Feel) ..............................................................................................................1 N-cm (1.5 oz-in.) maximum

W, S & T Bushings (Ball Bearing Shaft Support) ..............................................................................................................0.07 N-cm (0.1 oz-in.) maximum

Mounting Torque ...................................................................................................................................................1.7 to 2.0 N-cm (15 to 18 lb.-in.) maximum

Shaft End Play .................................................................................................................................................................. 0.30 mm (0.012 ”) T.I.R. maximum

Shaft Radial Play .............................................................................................................................................................. 0.12 mm (0.005 ”) T.I.R. maximum

Weight .......................................................................................................................................................................................................... 11 gms. (0.4 oz.)

Terminals ......................................................................................................................................................................Axial or radial pc pins or ribbon cable

Soldering Condition

Manual Soldering ................................................................................................................... 96.5Sn/3.0Ag/0.5Cu solid wire or no-clean rosin cored wire

370 °C (700 °F) max. for 3 seconds

Wave Soldering ...........................................................................................................................................96.5Sn/3.0Ag/0.5Cu solder with no-clean ﬂux

260 °C (500 °F) max. for 5 seconds

Wash processes .................................................................................................................................................................................... Not recommended

Marking .................................................................................................................................Manufacturer’s trademark, name, part number, and date code.

Hardware ................................................................. One lockwasher and one mounting nut supplied with each encoder, except on servo mount versions.

**For resolutions

≤

128 quadrature cycles per shaft revolution.

Quadrature Output Table

OUTPUT VOLTAGE

Channel A

Channel B

1 cycle

360

° ±

Clockwise rotation

STANDARD RESOLUTIONS AVAILABLE

(Full quadrature output cycles per shaft revolution)

25*

125

50*

128

200

100

256

For Non-Standard Resolutions—Consult Factory

* Channel B leads Channel A

*RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.

Speciﬁcations are subject to change without notice.

Customers should verify actual device performance in their speciﬁc applications.

EN - Rotary Optical Encoder

Dimensional Drawings

2.54

TYP.

(.100)

Optional

Radial Leads

.635

SQ.

(.025)

18.5

(.73)

6.35

(.250)

15.88

(.625)

2.36

(.093)

21.21

(.835)

1/4-32 UNEF

3.167 + .000/ – .0076

DIA.

(.1247 + .000/ – .0003)

1.37

(.054)

9.53

(.375)

9.525

(.375)

8.636

(.34 )

Bushing Style

6.342 + .000/ – .0076

DIA.

(.2497 + .000/ – .0003)

3/8-32 UNEF

10.32 + .000/ – .0508

DIA.

(.4062 + .000/ – .002)

9.53

(.375)

7.14 + .000/ – .0508

DIA.

(.281 + .000/ – .002)

9.53

(.375)

.254

.076

(.010 .003)

Consult factory for options not shown,

including:

• Wire lead or cable options

• Connectors

• Non-standard resolutions

• Special shaft/bushing sizes and

features

• Special performance characteristics

• PCB mounting bracket

6.34

(.2497)

5.54

(.218)

SHAFT

LENGTH

12.7

(.050)

15.9

(.625)

SHAFT FLAT

LENGTH

(DIM. F)

2.54

(.100)

5.08

(.200)

8.25

(.325)

9.65

(.380)

9.53

(.375)

1.57

3/8-32 UNEF

(.062)

6.342 + .000/ – .0076

DIA.

(.2497 + .000/ – .0003)

1/4-32 UNEF

1.57

(.062)

3.167 + .000/ – .0076

DIA.

(.1247 + .000/ – .003)

.787

.254

(.031

.010)

19.1

(.750)

22.2

(.875)

Bushing Style

(Ball Bearing)

Bushing Style

(Ball Bearing)

1.57

(.062)

1.57

(.062)

1.57

(.062)

Anti-rotation Lug

View

Shaft End Style

2.54

4 PLCS.

(.100)

4.14

(.163)

TERMINATION DIAGRAM

CHANNEL A

GROUND

N.C.

Vcc

CHANNEL B

11.13

(.438)

21.8

(.86)

3.167 + .000/ – .0076

DIA.

(.1247 + .000/ – .003)

18.11

(.713)

Optional

Radial Leads

19.05

.0127

DIA.

(.7500

.0005)

22.2 + .0127 / – .1270

DIA.

(.875 + .0005 / – .0050)

9 PLCS.

0.99

DIA. MIN.

(.039)

6.99

2 PLCS.

(.275)

Servo Mount Style

(Ball Bearing)

Recommended Board Layout

with Bracket

Ribbon Cable Option Detail

Bushing with Bracket

Radial Leads

Connector

Pinout

— A +B

Connector

Pinout

Axial Ribbon Cable Option

Radial Ribbon Cable Option

DIMENSIONS:

(INCHES)

Speciﬁcations are subject to change without notice.

Customers should verify actual device performance in their speciﬁc applications.

GENERAL INFORMATION

The Bourns

EN model is a self-contained rotary optical encoder.

It produces a 2-bit quadrature signal which is suitable for digital

systems where both magnitude and direction of adjustment must

be provided. The EN encoder is ideal for use as a digital panel

control or as a position sensing device in applications where long

life, reliability, high resolution and precise linearity are critical.

The EN series encoder converts rotary input into electrical signals

which can be used by microprocessors without A/D conversion.

Bourns encoder output signals are square wave digital pulses which

do not require debounce circuitry. Both features make it possible

to signiﬁcantly reduce the memory overhead, wiring and wiring inter-

connects required by other types of control devices.

EN optical encoders offer a useful rotational life of from 10 million to

200 million shaft revolutions, making them ideal for extended service

applications. The Bourns encoder is also compact and well suited for

situations where the available space is limited.

EN - Rotary Optical Encoder

How To Order

BOURNS EN SERIES OPTICAL ENCODER

E N C 1 J - D 2 8 - L 0 0 1 2 8 L

ANTI-ROTATION

LUG POSITION

Code Description

None

9:00 Position

Rear Mount-

ing Bracket

SWITCHING

CONFIGURATION

Code Description

Channel A

Leads

Channel B

By 90

(Clockwise

Rotation)**

SHAFT LENGTH*

Code Description

1/2 " Long

5/8 " Long

3/4 " Long

7/8 " Long

RoHS IDENTIFIER

Code Description

Compliant

TERMINAL***

CONFIGURATION

Code Description

Axial, Multi-

Purpose Pin

Radial, Multi-

Purpose Pin

Axial, Ribbon

& Connector

10 “

Radial, Ribbon

& Connector

10 ”

Axial, Ribbon

10 “ -

No Connector

Radial, Ribbon

10 ” -

No Connector

RESOLUTION

Cycles Per

Code Revolution

00025

00050

00064

100

00100

125

00125

128

00128

200

00200

256

00256

SHAFT STYLE

Code

Description

1/4 " Dia., Plain End

1/8 " Dia., Plain End

1/4 " Dia., Single

Flatted

Use With

Bushings (Code)

A, S

C, T, W

A, S

BUSHING CONFIGURATION

Code Description

3/8 "D X 3/8 "L Threaded

1/4 "D X 1/4 "L Threaded

3/8 "D X 3/8 "L Threaded

(Ball Bearing)

1/4 "D X 3/8 "L Threaded

(Ball Bearing)

Servo Mount 7/8 "D

(Ball Bearing)

* Shaft length measured from mounting surface.

** 25 and 50 PPR is reversed (Channel B leads Channel A).

*** Standard ribbon cable is 10 " long. Consult factory for other lengths.

REV. 06/12

Speciﬁcations are subject to change without notice.

Customers should verify actual device performance in their speciﬁc applications.

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