Features
■ Absolute encoder / absolute code output
■ Digital output
■ Sturdy construction
■ Bushing mount
■ Available with PC board mounting bracket (optional)
■ *RoHS compliant
EAW - Absolute Contacting Encoder (ACE™)
Electrical Characteristics
Output ...............................................................................................................................................................................8-bit code with 128 absolute states
Closed Circuit Resistance ...........................................................................................................................................................................5 ohms maximum
Open Circuit Resistance ....................................................................................................................................................................... 100 K ohms minimum
Contact Rating .................................................................................................................................................. 10 milliamp @ 10 VDC or 0.1 watt maximum
Insulation Resistance (500 VDC) ...................................................................................................................................................1,000 megohms minimum
Dielectric Withstanding Voltage (MIL-STD-202 Method 301)
Sea Level ............................................................................................................................................................................................ 1,000 VAC minimum
Electrical Travel .....................................................................................................................................................................................................Continuous
Contact Bounce (60 RPM)........................................................................................................................................................... 2.7 milliseconds maximum*
RPM (Operating) .............................................................................................................................................................................................. 120 maximum
Environmental Characteristics
Operating Temperature Range .......................................................................................................................................-40 ºC to +85 ºC (-40 °F to +185 °F)
Storage Temperature Range ..........................................................................................................................................-40 ºC to +85 ºC (-40 °F to +185 °F)
Humidity................................................................................................................................................................. MIL-STD-202, Method 103B, Condition B
Vibration .......................................................................................................................................................................................................................... 15 G
Contact Bounce ...........................................................................................................................................................................0.1 millisecond maximum
Shock............................................................................................................................................................................................................................... 50 G
Contact Bounce ...........................................................................................................................................................................0.1 millisecond maximum
Rotational Life.................................................................................................................................................................... 50,000 shaft revolutions minimum
IP Rating ..........................................................................................................................................................................................................................IP 40
Mechanical Characteristics
Mechanical Angle ........................................................................................................................................................................................ 360 ° Continuous
Running Torque .............................................................................................................................................................. 0.5 to 1.5 N-cm (0.75 to 2.50 oz-in.)
Mounting Torque .........................................................................................................................................................................79 N-cm (7 lb.-in.) maximum
Shaft Side Load (Static)....................................................................................................................................................................4.5 kg (10 lbs.) minimum
Weight ................................................................................................................................................................................ Approximately 14 gms. (0.50 oz.)
Terminals ................................................................................................................................................................................. Printed circuit board terminals
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 fl ux
260 °C (500 °F) max. for 5 seconds
Wash processes .................................................................................................................................................................................... Not recommended
Marking ...........................................................................................................................Manufacturer’s name and trademark, part number, and date code.
Hardware .................................................One lockwasher and one mounting nut are shipped with each encoder, except where noted in the part number.
Packaging ............................................................................................................................................................................................................. 45 pcs./tray
*High probability of missing quadrature codes with maximum bounce.
General Information
*RoHS COMPLIANT
Until now, the choice of an absolute
encoder meant an expensive, and larger-
sized product. Through the use of
combinatorial mathematics, the absolute
code pattern of the Bourns® Absolute
Contacting Encoder (ACE™) is placed on a
single track for a very economical, energy-
effi cient and compact product. Bourns®
ACE™ provides an absolute digital output
that will also retain its last position in the
event of a power failure.
An intelligent alternative to incremental
encoders and potentiometers, the Bourns®
ACE™ is ideally suited for many industrial,
medical and consumer product applications.
Recommended Control Diagram for ACE-128
P8
1
P
RESNET
4609X-
10 1- 4 7 2
“common” is either
on a decoded
“select” pin
(active low)
or at GND.
ACETAB:
256 byte
code
conversion
table (ROM)
P7P6P5P4P3P2P1
2
C
3
4
8
7
C
6
5
*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. Users should verify actual device performance in their specific
applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the
last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
WARNING Cancer and Reproductive Harm
www.P65Warnings.ca.gov
EAW - Absolute Contacting Encoder (ACE™)
Pin Output Code For ACE-128
Bit/Pin correlation: b7 b6 b5 b4 b3 b2 b1 b0 = p8 p7 p6 p5 p4 p3 p2 p1
A binary “1” denotes an “open” switch and a binary “0” denotes a “closed” switch.
Positions 0-127 are seen by a clockwise rotation of the shaft.
Position p8 p7 p6 p5 p4 p3 p2 p1
Decimal
Output
0 0 1 1 1 1 1 1 1 127
100111111 63
200111110 62
300111010 58
400111000 56
5 1 0 1 1 1 0 0 0 184
6 1 0 0 1 1 0 0 0 152
700011000 24
800001000 8
901001000 72
10 0 1 0 0 1 0 0 1 73
11 0 1 0 0 1 1 0 1 77
12 0 1 0 0 1 1 1 1 79
13 0 0 0 0 1 1 1 1 15
14 0 0 1 0 1 1 1 1 47
15 1 0 1 0 1 1 1 1 175
16 1 0 1 1 1 1 1 1 191
17 1 0 0 1 1 1 1 1 159
18 0 0 0 1 1 1 1 1 31
19 0 0 0 1 1 1 0 1 29
20 0 0 0 1 1 1 0 0 28
21 0 1 0 1 1 1 0 0 92
22 0 1 0 0 1 1 0 0 76
23 0 0 0 0 1 1 0 0 12
24 0 0 0 0 0 1 0 0 4
25 0 0 1 0 0 1 0 0 36
26 1 0 1 0 0 1 0 0 164
27 1 0 1 0 0 1 1 0 166
28 1 0 1 0 0 1 1 1 167
29 1 0 0 0 0 1 1 1 135
30 1 0 0 1 0 1 1 1 151
31 1 1 0 1 0 1 1 1 215
32 1 1 0 1 1 1 1 1 223
33 1 1 0 0 1 1 1 1 207
34 1 0 0 0 1 1 1 1 143
35 1 0 0 0 1 1 1 0 142
36 0 0 0 0 1 1 1 0 14
37 0 0 1 0 1 1 1 0 46
38 0 0 1 0 0 1 1 0 38
39 0 0 0 0 0 1 1 0 6
40 0 0 0 0 0 0 1 0 2
41 0 0 0 1 0 0 1 0 18
42 0 1 0 1 0 0 1 0 82
43 0 1 0 1 0 0 1 1 83
44 1 1 0 1 0 0 1 1 211
45 1 1 0 0 0 0 1 1 195
46 1 1 0 0 1 0 1 1 203
47 1 1 1 0 1 0 1 1 235
48 1 1 1 0 1 1 1 1 239
49 1 1 1 0 0 1 1 1 231
50 1 1 0 0 0 1 1 1 199
51 0 1 0 0 0 1 1 1 71
52 0 0 0 0 0 1 1 1 7
53 0 0 0 1 0 1 1 1 23
54 0 0 0 1 0 0 1 1 19
55 0 0 0 0 0 0 1 1 3
56 0 0 0 0 0 0 0 1 1
57 0 0 0 0 1 0 0 1 9
58 0 0 1 0 1 0 0 1 41
59 1 0 1 0 1 0 0 1 169
60 1 1 1 0 1 0 0 1 233
61 1 1 1 0 0 0 0 1 225
62 1 1 1 0 0 1 0 1 229
63 1 1 1 1 0 1 0 1 245
Position p8 p7 p6 p5 p4 p3 p2 p1 Decimal
Output
64 1 1 1 1 0 1 1 1 247
65 1 1 1 1 0 0 1 1 243
66 1 1 1 0 0 0 1 1 227
67 1 0 1 0 0 0 1 1 163
68 1 0 0 0 0 0 1 1 131
69 1 0 0 0 1 0 1 1 139
70 1 0 0 0 1 0 0 1 137
71 1 0 0 0 0 0 0 1 129
72 1 0 0 0 0 0 0 0 128
73 1 0 0 0 0 1 0 0 132
74 1 0 0 1 0 1 0 0 148
75 1 1 0 1 0 1 0 0 212
76 1 1 1 1 0 1 0 0 244
77 1 1 1 1 0 0 0 0 240
78 1 1 1 1 0 0 1 0 242
79 1 1 1 1 1 0 1 0 250
80 1 1 1 1 1 0 1 1 251
81 1 1 1 1 1 0 0 1 249
82 1 1 1 1 0 0 0 1 241
83 1 1 0 1 0 0 0 1 209
84 1 1 0 0 0 0 0 1 193
85 1 1 0 0 0 1 0 1 197
86 1 1 0 0 0 1 0 0 196
87 1 1 0 0 0 0 0 0 192
88 0 1 0 0 0 0 0 0 64
89 0 1 0 0 0 0 1 0 66
90 0 1 0 0 1 0 1 0 74
91 0 1 1 0 1 0 1 0 106
92 0 1 1 1 1 0 1 0 122
93 0 1 1 1 1 0 0 0 120
94 0 1 1 1 1 0 0 1 121
95 0 1 1 1 1 1 0 1 125
96 1 1 1 1 1 1 0 1 253
97 1 1 1 1 1 1 0 0 252
98 1 1 1 1 1 0 0 0 248
99 1 1 1 0 1 0 0 0 232
100 1 1 1 0 0 0 0 0 224
101 1 1 1 0 0 0 1 0 226
102 0 1 1 0 0 0 1 0 98
103 0 1 1 0 0 0 0 0 96
104 0 0 1 0 0 0 0 0 32
105 0 0 1 0 0 0 0 1 33
106 0 0 1 0 0 1 0 1 37
107 0 0 1 1 0 1 0 1 53
108 0 0 1 1 1 1 0 1 61
109 0 0 1 1 1 1 0 0 60
110 1 0 1 1 1 1 0 0 188
111 1 0 1 1 1 1 1 0 190
112 1 1 1 1 1 1 1 0 254
113 0 1 1 1 1 1 1 0 126
114 0 1 1 1 1 1 0 0 124
115 0 1 1 1 0 1 0 0 116
116 0 1 1 1 0 0 0 0 112
117 0 1 1 1 0 0 0 1 113
118 0 0 1 1 0 0 0 1 49
119 0 0 1 1 0 0 0 0 48
120 0 0 0 1 0 0 0 0 16
121 1 0 0 1 0 0 0 0 144
122 1 0 0 1 0 0 1 0 146
123 1 0 0 1 1 0 1 0 154
124 1 0 0 1 1 1 1 0 158
125 0 0 0 1 1 1 1 0 30
126 0 1 0 1 1 1 1 0 94
127 0 1 0 1 1 1 1 1 95
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
87C65
12C34 0.51
(.020)
2.54
(.100)
0.64 ± 0.03
(.025 ± .001)
10 PLCS.
0.76
(.030)TYP. 4 PLCS.
Bushing Mounted: Housing A with Rear Facing Terminals
PCB Bracket Mounted: Housing B
1.52
(.060)
1.02
(.040)
0.64 ± 0.03
(.025 ± .001)
10 PLCS.
2.54
(.100)
8 PLCS.
3.68 ± .38
(.145 ± .015)
9.02
(.355)
5.08
(.200)
6.32 +0.03/-0.08
(.249 +.001/-.003)
6.32 +0.03/-0.08
(.249 +.001/-.003)
8.51 ± .25
(.335 ± .010)
19.05 ± .38
(.750 ± .015)
6.35
(.250)
12.7
(.500) 1.6
(.063)
12.7
(.500) 1.6
(.063)
1.19
(.047)
1.19
(.047)
9.0
(.354)DIA.
M9 X 0.75-6g SPL
9.0
(.354)DIA.
M9 X 0.75-6g SPL
2.79
(.110) 13.97
(.550)
11.1
(.437)
27.94 ± .25
(1.100 ± .010)
18.54 ± .38
(.730 ± .015)
14.7 ± 0.5
(.578 ± .020)
1.19
(.047)
9.02 ± .15
(.355 ± .006)
22.2 ± .25
(.874 ± .010)
23.88
(.940)
DIA.
87C65
12C34
2.79
(.110) 13.97
(.550)
11.1
(.437)
27.94 ± .25
(1.100 ± .010)
17.07 ± .25
(.672 ± .010)
1.19
(.047)
9.02 ± .15
(.355 ± .006)
22.2 ± .25
(.874 ± .010)
23.88
(.940)
23.37 ± .25
(.920 ± .010)
Bushing Mounted: Housing A with Forward Facing Terminals
1.52
(.060)
0.64 ± 0.03
(.025 ± .001)
10 PLCS.
2.54
(.100)
8 PLCS.
2.54 ± .25
(.100 ± .010)
6.32 +0.03/-0.08
(.249 +.001/-.003)
8.51 ± .25
(.335 ± .010)
19.05 ± .38
(.750 ± .015)
6.35
(.250)
12.7
(.500) 1.6
(.063)
1.19
(.047)
9.0
(.354)DIA.
M9 X 0.75-6g SPL
2.79
(.110) 13.97
(.550)
11.1
(.437)
27.94 ± .25
(1.100 ± .010)
14.7 ± 0.5
(.578 ± .020)
1.19
(.047)
9.02 ± .15
(.355 ± .006)
22.2 ± .25
(.874 ± .010)
23.88
(.940)
DIA.
87C65
12C34
EAW - Absolute Contacting Encoder (ACE™)
Dimensional Drawings
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
EAW - Absolute Contacting Encoder (ACE™)
Dimensional Drawings
Panel Hole Dimensions
Shaft Style C
"D"
Shaft Style RShaft Style B
"D" DIMENSION EXTENDS FROM SHAFT END TO BUSHING FACE
"D" = (SHAFT LENGTH, FMS) – (BUSHING LENGTH)
PCB Board Hole Pattern w/PCB Bracket
6.00 ± 0.05
(.236 ± .002)
1.6
(.063)
1.19
(.047)
6.32 + 0.03/– 0.06
(.249 + .001/– .003) DIA.
5.54 ± .076
(.218 ± .003)
6.32 + 0.03/– 0.06
(.249 + .001/– .003) DIA.
1.6
(.063)
1.19
(.047)
9.5
(.375) 9.93
(.391)
3.17
(.125)
DIA.
DIA.
2.54
(.100)
25.4
(1.00)
1.2
(.047)
TYP.
DIA. 10 PLCS.
DIA.
TOLERANCES EXCEPT WHERE NOTED:
.XX = ± .XXX = ±
DIMENSIONS:
.51
(.02)
.127
(.005)
MM
(IN)
Bushing Mounted: Housing A with Rear Facing Terminals
Panel Hole Dimensions PCB Board Hole Pattern w/PCB Bracket
9.5
(.375) 9.93
(.391)
3.17
(.125)
DIA.
DIA.
2.54
(.100)
25.4
(1.00)
15.24
(.600)
5.08
(.200)
1.2
(.047)
TYP.
11.43
(.450) 2 PLCS.
DIA. 14 PLCS.
2 PLCS.
PCB Bracket Mounted: Housing B
PCB Board Hole Pattern w/PCB Bracket
9.5
(.375) 9.93
(.391)
3.17
(.125)
DIA.
DIA.
2.54
(.100)
25.4
(1.00)
1.2
(.047)
TYP.
DIA. 10 PLCS.
Bushing Mounted: Housing A with Forward Facing Terminals
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
EAW - Absolute Contacting Encoder (ACE™)
How to Order
PART NUMBERING SYSTEM
EAW0J -B24 -AE0128L
Code
L
Description
Compliant
Code
A
Rotational Life
50,000 Revolutions
Code
W
L
Description
9 mm x 1/4 " Length. Threaded M9x0.75
9 mm x 3/8 " Length. Threaded M9x0.75
(Use B shaft only.)
BUSHING CONFIGURATION
Code
0
Description
Non-Detented
DETENT CONFIGURATION
Code
J
D
Description
9:00 Position
None
ANTI-ROTATION LUG POSITION
Code
B
C
R
Description
Plain with Inserted Slot (1/4 " Dia.)
Single Flatted (1/4 " Dia.)
Plain with Inserted Slot (6 mm Dia.)
SHAFT STYLE (See Outline Drawing for Details)
Code
E0128
PERFORMANCE CODE
RoHS IDENTIFIER
States/Rev.
128
Detents
0
Features
Rear Mount Terminals
Forward Facing Terminals
PCB Bracket
Hardware Included
HOUSING TERMINAL CONFIGURATION
(X indicates “Equipped With”)
Code
A
X
X
B
X
X
C
X
X
X
H
X
X
K
X
Code
24
19
SHAFT LENGTH (FMS)
Available
Shaft Styles
B, C
R
Description
3/4 " (19.05 mm) Length
Metric
19 mm Length
The sample part number demonstrates the identification
code for Bourns contacting encoders.
The part number shown is a commonly used model,
typically available from stock.
*Consult factory concerning special inquiries.
REV. 11/18
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
Legal Disclaimer Notice
This legal disclaimer applies to purchasers and users of Bourns® products manufactured by or on behalf of Bourns, Inc. and
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Unless otherwise expressly indicated in writing, Bourns® products and data sheets relating thereto are subject to change
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The characteristics and parameters of a Bourns® product set forth in its data sheet are based on laboratory conditions, and
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