Electrocomponents
Commercial
Miniature 16mm Size
Rotary Encoder
Features
Robust Construction
2-bit Incremental or 4-bit Absolute
Encoder
Optional Momentary Switch
Available with 16 Detents
Continuous Rotation
Bushing Mount
Solder Lug or PCB Terminals
RoHS Compliant
®
Series 288
Data Sheet
Rotary Encoder
Encoder:
Electrical and Mechanical Specifications
Contact Resistance
Voltage Rating
Detent Points
16 detents available
Rotational Life
50,000 cycles
Resolution
2-bit: 4, 6, 8,10 or 12 pulses in 360°
4-bit: 16 combinations in 360°
Insulation Resistance
Temperature Range
Operating: -25°C to +100°C
Storage: -30°C to +100°C
Rotational Torque
No Detent: 36 - 216 gf.cm
With Detent: 100 - 500 gf.cm
Solder Heat Resistance
260°C for 5 seconds
Push-Pull Strength of Shaft
8 kg minimum for 10 seconds
Special
Consult CTS for customized or features
not listed, including other detent points,
resolution, torque and mounting style.
1-4
CTS Electrocomponents
© 2011 CTS Corporation. All rights reserved. Information subject to change.
05/20/11
www.ctscorp.com
Electrical and Mechanical Specifications
(continued)
Optional Momentary Switch:
Switch Contact Resistance
Switch Rating
Switch Bounce
Switch Operating Force
350 ± 150 g (12.3 ± 5.3 oz.)
Switch Life
15,000 operations
Switch Travel
0.5mm (.020”)
4 BIT GRAY CODE
POS.
NO.
DENOTES CONTACT
CLOSURE TO COMMON
A
B
E
F
Truth Table
2 BIT BINARY CODE
DENOTES
B
CONTACT
CLOSURE TO
A
COMMON
4 BIT HEXADECIMAL CODE
POS.
NO.
DENOTES CONTACT
CLOSURE TO COMMON
A
B
E
F
0
0
1
0
1
2
1
1
3
1
0
4
0
0
5
0
1
6
1
1
7
1
0
8
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
1
1
0
POS. NO.
9 10 11 12 13 14 15 16
46 47 48
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
0 0
0 0
0 0
0 0
1 0
1 0
1 1
1 1
0 1
0 1
0 1
0 1
1 1
1 1
1 0
1 0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
288X
Typical 2-bit Encoder parallel to P.C. Board
MTG. SURFACE
10.2±0.4
.402±.016
"L"±
0.8
.031
"A"±
.016
0.4
18.0
.709
MAX.
8.5
.335
10.00±0.05
.394±.002
5.00±0.05
.197±.002
MAX.
MTG. SURFACE
7.9±0.13
.311±.005
3/8-32UNEF-2A
11.20
.441
6.83
.269
12.50
.492
B
C
A
Ø1.40 (3)
.055
A
16.4
.646
C
B
DIMENSION :
mm
INCH
2-288X
Typical 4-bit Encoder parallel to P.C. Board
MTG. SURFACE
18.0
.709
MTG. SURFACE
3.68
REF.
.145
8.5
.335
7.9±0.13
.311±.005
11.2
.441
MAX.
3/8-32UNEF-2A
MAX.
B
12.5
.492
Ø1.40 (6)HL'S.
.055
F
C
D
A
E
8.10±0.05
.319±.002
0.4
"A"± .016
15.1±0.4
.594±.016
0.8
"L"± .031
E
A
D
16.4
.646
C
F
B
5.00±0.05
.197±.002
10.00±0.05
.394±.002
DIMENSION :
2-4
CTS Electrocomponents
© 2011 CTS Corporation. All rights reserved. Information subject to change.
mm
INCH
05/20/11
www.ctscorp.com
288T
Typical 2-bit Encoder With Solder Lug Terminals
MTG. SURFACE
10.2±0.4
.402±.016
"L"±0.8
±.031
"A"±0.4
±.016
MAX.
18.0
.709
MAX.
8.5
.335
11.2
.441
7.3
.284
A
2.18X1.52 HL'S(3)
.086X.060
C
16.4
.646
B
2.92±0.08
.115±.003
mm
INCH
7.9±0.13
.311±.005
3/8-32UNEF-2A
DIMENSION :
288V
Typical 2-bit Perpendicular to P.C. Board
MTG. SURFACE
10.2±0.4
.402±.016
3/8-32UNEF-2A
18.0
.709 MAX.
8.5
.335
5.00±0.05
.197±.002
10.00±0.08
.394±.003
CENTER LINE OF ENCODER
Ø1.40(3) HL'S
.055
A
C
B
7.9±0.13
.311±.005
MAX.
"A"±
0.4
.016
12.5
.492
A
C
16.4
.646
B
12.70
.500
6.4
.252
0.8
"L"± .031
DIMENSION :
mm
INCH
MC-288V
Typical 2-bit Encoder With Momentary Switch Perpendicular to P.C. Board
MTG. SURFACE
12.26
.483
10.76
.424
"L"±
3/8-32UNEF-2A
0.8
.031
7.9±0.13
.311±.005
MAX.
18.0
.709
Ø1.70 (2)
.067
B
12.5
.492
2.5±0.13(2)
.098±.005
7.0±0.13
.276±.005
S1 S2
C
8.5
MAX.
.335
(2) HL'S
Ø1.40
(3) HL'S
.055
5.00±0.13 (2)
.197±.005
4.87
.192
"A"±
0.4
.016
A
0.5 TRAVEL
.020
(REFERENCE)
C
16.4
.646
B
A
13.30±0.13
.524±.005
DIMENSION :
mm
INCH
MC-288X
12.26
.483
10.76
.424
Typical 2-bit Encoder With Momentary Switch Parallel to P.C. Board
MTG. SURFACE
3/8-32 UNEF-2A
18.0
.709
MAX.
10.00±0.08
.394±.003
5.00±0.05
.197±.002
8.5
MAX.
.335
MTG. SURFACE
7.9±0.13
.311±.005
6.83
.269
B
C
A
0.5 TRAVEL
.020
(REFERENCE)
"A"±
"L"±
0.4
.016
0.8
.031
12.5
.492
Ø1.40 (5)HL'S.
A
4.0
.157
16.4
.646
1.00±0.13(5)
0.39±.005
C
B
3.07±0.13
.121±.005
2.5±0.05
.098±.002
S2
S1
2.5±0.05
.098±.002
DIMENSION :
mm
INCH
3-4
CTS Electrocomponents
© 2011 CTS Corporation. All rights reserved. Information subject to change.
www.ctscorp.com
05/20/11
Shaft Trim
“Z”
“X”
“X” “Y”
“W” “X”
“Y”
“X” “Y”
“Z”
“Z”
R - ROUND
X
Imperial Shaft .250”
Metric Shaft 6.00
X
Y
Z
Imperial Shaft .250” .156” .375”
6.00 4.50 7.00
Metric Shaft
F - FLATTED
K - KNURLED & SLOTTED
W
X
Y
Z
Imperial Shaft .250” .062” .344” 24 TEETH
Metric Shaft
6.00 1.57 7.0 18 TEETH
S - SLOTTED
X
Y
Z
Imperial Shaft .250” .046” .062”
Metric Shaft
6.00 1.17 1.57
DIMENSION:
inch
mm
Ordering Information
288
T
B
24
F
SHAFT TRIM
R
– ROUND
F
– FLATTED
K
– KNURLED & SLOTTED
S
– SLOTTED
40
2
ENCODER CODE
1
– 2 BIT BINARY
*
2
– 4 BIT GRAY
*
3
– 4 BIT HEXADECIMAL
*
16 COMBINATION ONLY
A
1
DETENT
1
– NONE
2
– 16 DETENTS
TERMINAL STYLE
*
T
– SOLDER LUG
X
– PC
**V
– PC FORMED
TO REAR
*
Not available in
switch construction.
**Not available with
4 bit code
SWITCH
A
– NONE
*
B
– MOMENTARY
SWITCH
"A" BUSHING LENGTH
mm
A=5.0mm
B=6.35mm
C=7.0mm
D=9.53mm
ALL
M8X.75P
inch
2=.250"
3=.375"
8=1.000"
ALL
3/8-32 UNEF-2A
"L" SHAFT LENGTH
mm
A0=10mm
A5=15mm
B0=20mm
B5=25mm
C0=30mm
C5=35mm
ALL
6.0mm Dia.
*
2 BIT MODELS ONLY
inch
20=.625"
24=.750"
28=.875"
32=1.000"
COMBINATION (RESOLUTION)
16
- 16 COM (4 PULSES - 2 bit)
- 16 COM (1 PULSE - 4 bit)
24
- 24 COM (6 PULSES)
32
- 32 COM (8 PULSES)
40
- 40 COM (10 PULSES)
48
- 48 COM (12 PULSES)
ALL
.250" Dia.
Please consult CTS for customized or features not listed.
4-4
CTS Electrocomponents
© 2011 CTS Corporation. All rights reserved. Information subject to change.
www.ctscorp.com
05/20/11
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