Series 288 Encoder
®
16 mm
Rotary
Encoders
Features
• Low cost, robust design
• Miniature 16mm style
• Bushing mounted
• PC terminals, with shaft parallel
or perpendicular to PC board
• 2 bit, 4 bit Gray and 4 bit
Hexidecimal codes available
• 16 detents available
• Optional momentary switch
• RoHS compliant
Electrical and Mechanical Specifications
Voltage Rating
5VDC @ 0.5milliamp
Current Rating
5mA max.
Temperature Rating
Operation: -25°C to +100°C
Contact Resistance
500 ohms static closed circuit maximum
Contact CTS for special requirements
Detent Points
16 detents avaialable
Resolution Switch Rating
4,6,8,10 or 12 pulses in 360° on 2 bits
Total Rotational Angle
360°
Rotational Torque
36~216 gfcm (0.5~3 in-oz)
Contact CTS for special requirements
Rotational Life
50,000 cycles min.
Switch Life
15,000 operations for 0.5mm(.020") travel
Switch Contact Resistance
100 milliohms maximum initial
200 milliohms maximum after life
Switch Operation Force
350 ±150 gf (12.3 oz ±5.3 oz)
Switch Bounce
5 milliseconds max.
Switch Travel Length
0.5mm (.020”)
Pull and Thrust on Shaft
Withstand a pushing force and pulling force
of 8 kg static load applied to axial direction
for 10 ±1 second without physical damage or
electrical degradation
1-4
CTS Electronic Components
© 2008 CTS Corporation. All rights reserved. Information subject to change.
www.ctscorp.com
2/19/08
4 BIT GRAY CODE
POS.
DENOTES CONTACT
CLOSURE TO COMMON
A
B
E
F
4 BIT HEXIDECIMAL
POS.
NO.
DENOTES CONTACT
CLOSURE TO COMMON
A
B
E
F
TRUTH TABLE 2 BIT BINARY
DENOTES
B
CONTACT
CLOSURE TO
A
COMMON
NO.
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
1
1
1
1
1
1
1
1
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0 0
1 0
1 1
0 1
0 1
1 1
1 1
0 1
0 1
1 1
1 0
0 0
0 0
1 0
1 0
0 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
X288
Typical 2-bit Encoder parallel to P.C. Board
MTG. SURFACE
10.2±0.4
.402±.016
18.0
.709
"L"±
0.8
.031
0.4
"A"±
.016
MAX.
8.5
.335
10.00±0.05
.394±.002
5.00±0.05
.197±.002
MTG. SURFACE
7.9±0.13
.311±.005
MAX.
11.20
.441
6.83±0.05
.269±.002
12.50
.492
3/8-32UNEF-2A
B
C
A
Ø1.40 (3)
.055
A
C
16.4
.646
B
DIMENSION :
mm
INCH
X2-288
Typical 4-bit Encoder parallel to P.C. Board
MTG. SURFACE
MAX.
3/8-32UNEF-2A
8.5
.335
7.9±0.13
.311±.005
11.2
.441
MTG. SURFACE
3.68±0.05
.145±.002
18.0
.709
MAX.
A
12.5
.492
Ø1.40 (6)HL'S.
.055
E
C
D
B
F
8.10±0.05
.319±.002
B
F
C
16.4
.646
D
A
E
0.4
"A"± .016
15.1±0.4
.594±.016
0.4
"A"± .016
5.00±0.05
.197±.002
10.00±0.05
.394±.002
DIMENSION :
mm
INCH
2-4
CTS Electronic Components
© 2008 CTS Corporation. All rights reserved. Information subject to change.
www.ctscorp.com
2/19/08
T288
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
10.9
.429
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 :
V288
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-V288
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-X288
Typical 2-bit Encoder With Momentary Switch Parallel to P.C. Board
12.26
.483
10.76
.424
MTG. SURFACE
3/8-32 UNEF-2A
8.5
MAX.
.335
18.0
.709
MAX.
10.00±0.08
.394±.003
5.00±0.05
.197±.002
7.9±0.13
.311±.005
6.83±0.13
.269±.005
B
C
A
MTG. SURFACE
12.5
.492
Ø1.40 (5)HL'S.
0.5 TRAVEL
.020
(REFERENCE)
0.4
"A"±
.016
"L"±
0.8
.031
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
PANEL PIERCING
S2
S1
2.5±0.05
.098±.002
DIMENSION :
mm
INCH
3
-4
CTS Electronic Components
© 2008 CTS Corporation. All rights reserved. Information subject to change.
www.ctscorp.com
2/19/08
Ordering Information
288
TERMINAL STYLE
*
T
– SOLDER LUG
X
– PC
V
– PC FORMED
TO REAR
*
Not available in
switch construction.
T
B
24
F
40
2
A
SWITCH CODE
A
– NONE
*
B
– MOMENTARY
SWITCH
*
2 BIT MODELS
ONLY
1
DETENT
SHAFT TRIM
"A" BUSHING LENGTH
mm
A=5.0mm
B=6.35mm
C=7.0mm
D=9.53mm
ALL
M8X.75P
1
– NONE
*
2
– 16 DETENTS
ENCODER CODE
1
– 2 BIT BINARY
*
2
– 4 BIT GRAY
*
3
– 4 BIT
HEXIDECIMAL
*
16-16 COM ONLY
inch
2=.250"
3=.375"
8=1.000"
ALL
3/8-32 UNEF-2A
R
– ROUND
F
– FLATTED
7.0mm x 4.5mm
(.375" x .156”)
K
– KNURLED
18 TEETH
(7.0mm x 1.57mm)
24 TEETH
(.344” x .062”)
S
– SD SLOT
0.046” DEEP X 0.276” WIDE
(1.17.0mm X 7.0mm)
COMBINATION
16-16 COM (4 PULSES)
24-24 COM (6 PULSES)
32-32 COM (8 PULSES)
40-40 COM (10 PULSES)
48-48 COM (12 PULSES)
"L" SHAFT LENGTH
mm
A0=10mm
A5=15mm
B0=20mm
B5=25mm
C0=30mm
C5=35mm
ALL
6.0mm Dia.
inch
20=.625"
24=.750"
28=.875"
32=1.000"
ALL
.250" Dia.
METRIC BUSHING EQUIPPED WITH METRIC SHAFT.
4-4
CTS Electronic Components
© 2008 CTS Corporation. All rights reserved. Information subject to change.
2/19/08
www.ctscorp.com
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