Output ................................................................................... 2-bit quadrature code, Channel A leads Channel B by 90 º (electrical) with clockwise rotation
Resolution............................................................................................................................................................................... 25 to 256 cycles per revolution
Supply Current.............................................................................................................................................................................................. 26 mA maximum
Output Voltage
Low Output .................................................................................................................................................................................................0.8 V maximum
High Output.....................................................................................................................................................................................................4 V minimum
Output Current
Low Output ................................................................................................................................................................................................ 25 mA minimum
Rise/Fall Time ..................................................................................................................................................................................................200 ns (typical)
Shaft RPM (Ball Bearing) ....................................................................................................................................................................... 3,000 rpm maximum
Power Consumption .................................................................................................................................................................................. 136 mW maximum
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
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
Terminals ......................................................................................................................................................................Axial or radial pc pins or ribbon cable
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
° ±
90
°
Clockwise rotation
STANDARD RESOLUTIONS AVAILABLE
(Full quadrature output cycles per shaft revolution)
25*
125
50*
128
64
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
C
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)
R.
.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)
F
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
A
Bushing Style
S
(Ball Bearing)
Bushing Style
T
(Ball Bearing)
1.57
(.062)
1.57
(.062)
1.57
(.062)
Anti-rotation Lug
View
Shaft End Style
C
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
-
A
+
B
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
W
(Ball Bearing)
Recommended Board Layout
with Bracket
Ribbon Cable Option Detail
Bushing with Bracket
Radial Leads
Connector
Pinout
— A +B
Connector
Pinout
5
4
3
2
1
5
4
3
2
1
Axial Ribbon Cable Option
Radial Ribbon Cable Option
DIMENSIONS:
MM
(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
D
9:00 Position
J
Rear Mount-
P
ing Bracket
SWITCHING
CONFIGURATION
Code Description
Channel A
Leads
Channel B
1
By 90
°
(Clockwise
Rotation)**
SHAFT LENGTH*
Code Description
1/2 " Long
16
5/8 " Long
20
3/4 " Long
24
7/8 " Long
28
RoHS IDENTIFIER
Code Description
L
Compliant
Blank Non-Compliant
Non-compliant versions are
available, but not recommended
for new designs.
TERMINAL***
CONFIGURATION
Code Description
L
Axial, Multi-
Purpose Pin
Radial, Multi-
R
Purpose Pin
Axial, Ribbon
M
& Connector
10 “
Radial, Ribbon
N
& Connector
10 ”
Axial, Ribbon
W
10 “ -
No Connector
Radial, Ribbon
Y
10 ” -
No Connector
RESOLUTION
Cycles Per
Code Revolution
25
00025
50
00050
64
00064
100
00100
125
00125
128
00128
200
00200
256
00256
SHAFT STYLE
Code
B
D
C
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
A
3/8 "D X 3/8 "L Threaded
C
1/4 "D X 1/4 "L Threaded
S
3/8 "D X 3/8 "L Threaded
(Ball Bearing)
1/4 "D X 3/8 "L Threaded
T
(Ball Bearing)
Servo Mount 7/8 "D
W
(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. 04/12
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
