302
Encoders Metal
Shaft Insulated
Shaft Ring
Type
Hollow
Shaft
Ring encoder with 4mm height contribute to
space saving and multifunctioning
21mm Size Ring Type
EC21A
EC21C
■Typical Specifications
Items Specifications
Rating
10mA 5V DC
Operating life
50,000 cycles
Operating temperature range
−40℃ to ＋85℃
1.5
90°
C
AB
22.3
2.6
2.6
23.6
16.6
23.2
3–ø1 holes
90°
5
No.
Dimensions Unit:mm
PC board mounting hole dimensions
(Viewed from mounting side)
Style
1
Photo
°
°
°
°
Do not wire the shaded area
Packing Specifications
Tray
Product No. Number of packages （pcs.）
Export package measurements
（mm）
1 case /Japan
1 case /export packing
EC21A0920401 240 480 285×375×223
EC21A15 600 1, 2 0 0 3 6 4 × 5 0 8 ×19 2
EC21A1520407
EC21A0950402 600 1, 2 0 0 360×5 4 0×290
EC21C 640 640 310×4 00×185
Refer to P.315 for soldering conditions.
Product Line
Dip
9
16±7
7±5
15
12±5
17±8 （Initial）, 12
＋7
− 4
（After reflow）
Reflow 12
30
18
30
18
30
15
9
15
9
15
EC21A1520401
EC21A1520407
EC21A0920401
EC21A0950402
EC21C1520402
Product No.
EC21A1540401 1
2
3
4
5
No.
Structure Detent torque
（mN・m）
Actuator
l e n g t h（ m m ） Number of
detent
Number of
pulse
600 1, 2 0 0
240
600
640
480
1, 2 0 0
640
Minimum order unit （pcs.）
Japan Export
303
Encoders Metal
Shaft Insulated
Shaft Ring
Type
Hollow
Shaft
EC21A/EC21C／21mm Size Ring Type
No.
Dimensions Unit:mm
PC board mounting hole dimensions
(Viewed from mounting side)
Style
2
3
4
5
Photo
Do not wire the shaded area
Do not wire the shaded area
Do not wire the shaded area
1.5
2
90°
C
AB
22.3
16
2.6
1.8
2
2.6
23.6
16.6
23.2
3–ø1 hole
ø1.5 hole
90°
5
Mounting surface
3.5 9
43
2
2.5
3-2
4-4
3-2
21.6
120°
120°
ø12.2
0.7
21.6
4-2.5
ø10.8
120°
120°
1
2-8
AB
C
ø15.4
1
4-3.05
12.2
21.6
10.8
3-2.1
2-2.6
120°
120°
120°
120°
A B
C
2-2.5
3-φ1.45
14.5
3-1.5 3
3-2.05
15.4
15
3.5
3-C0.3
22.3
2-16.6
2-23.2
23.6
3- 1.05
hole
5
2-2.65
2-1.55
3-3
3-1.55
2.6
90°
30°
16.3
8.15
2-8
43-8
Mounting surface
2-2.5
3-2.05
3
φ15.4
3-8
14.5
2-1.5 4
C0.3
3.5
15
Mounting
surface
6-C0.2
120°
120°
120°
120°
4-3.05
2-8
21.6
φ10.8
1
2-2.6
3-0.625
2.1
AB
C
X X
Y
Y
90°
2
16
5
3-φ1.05
hole
23.6
22.3
2-16.6
2-23.2
2-1.55
2-2.65
4-2.6
φ1.55 hole
1.7
1.55
2-φ1.45
2-φ0.95
φ15.4
3-2.1
0.8
0.8
2-2
C0.2
2-1.6
3
7
12
2
4
Mounting surface
90°
30°
16.3
8.15
22.3
2-16.6
2-23.2
23.6
3-φ1.05
holes
5
2-2.65
2-1.55
3-3
3-1.55
2.6
φ10.8
φ12.2
3-2.05
4-4.1
22
3-0.625
120°
120°
120°
120°
21.65
4-2.6
1
2-8
A B
C
1
4-3.05
12.2
21.6
10.8
3-2.1
2-2.6
120°
120°
120°
120°
A B
C
2-2.5
3-φ1.45
14.5
3-1.5 3
3-2.05
15.4
15
3.5
3-C0.3
22.3
2-16.6
2-23.2
23.6
3- 1.05
hole
5
2-2.65
2-1.55
3-3
3-1.55
2.6
90°
30°
16.3
8.15
2-8
43-8
Mounting surface
2-2.5
3-2.05
3
φ15.4
3-8
14.5
2-1.5 4
C0.3
3.5
15
Mounting
surface
6-C0.2
120°
120°
120°
120°
4-3.05
2-8
21.6
φ10.8
1
2-2.6
3-0.625
2.1
AB
C
X X
Y
Y
90°
2
16
5
3-φ1.05
hole
23.6
22.3
2-16.6
2-23.2
2-1.55
2-2.65
4-2.6
φ1.55 hole
1.7
1.55
304
Encoders Metal
Shaft Insulated
Shaft Ring
Type
Hollow
Shaft
A signal
B signal
OFF ON
ONOFF
Detent stability position
CW direction
5V DC
RR
Terminal B
Terminal A
Terminal C
Encoder
Test circuit
tt
V
1
V
2
5V
ON ONOFF
Output waveform
Sliding direction
t : Masking time to avoid chattering
Measurementcondition：Rotationspeed360
˚/s
Output Wave Sliding Noise
※Detent position cannot be specified for B signal.
V1=V2=2.5V max.
At R = 5kΩ
Chattering : 5ms max. Bounce : 5ms max.
21mm Size Ring Type
EC21A
EC21C
Type
Ring type
21mm size 28mm size 35mm size
Series
EC21A EC21C EC28A EC28C EC35A EC35AH
Photo
Output
Incremental
（Two phase A and B ）
Incremental
（ Three phase A, B and C）
Shaft types
Ring type
Number of pulse /
Number of detent
9 /18
15 / 3 0 15 / 3 0 15 / 3 0
18 /18 15 / 3 0 6×A B C / 18
10×A B C / 3 0
Dimensions
（mm）
W
21. 6
22 28 28
35
D
21. 6 29 29.5
H
44.5
Operating temperature range
−40℃ to ＋85℃ −40℃ to ＋90℃ −40℃ to ＋85℃
Operating life
50,000 cycles
Automotive use
●●●●●●
Life cycle (availability)
Electrical
performance
Rating
10 m A 5 V D C
Max./min. operating
current（Resistive load）
10mA / 1mA
Insulation resistance
10 0 MΩ m i n . 25 0 V D C
Voltage proof
3 0 0 V A C f o r 1mi n u t e
or 360V AC for 2s
3 0 0 V A C f o r 1mi n u t e
or 360V AC for 1s
3 0 0 V A C f o r 1mi n u t e
or 360V AC for 2s
3 0 0 V A C f o r 1mi n u t e
or 360V AC for 1s
3 0 0 V A C f o r 1mi n u t e
or 360V AC for 2s
Mechanical
performance
Detent torque
7±5mN･m
12 ±5 m N･m
16±7 m N･m
17±8mN･m
（Initial）
12 　 mN･m
（After reflow）
7±5mN･m
12±7 m N･m
2 0 ±10 m N ･ m
30±15mN･m
（Initial）
2 0 ±10 m N ･ m
（After reflow）
18±7 m N･m
3 0 ±15 m N ･ m
12 ±5 m N･m
18±7 m N･m
3 0 ±15 m N ･ m
Push-pull
strength
Push
10 0 N
Pull
10 0 N
Shaft configuration
Ring type
Terminal type
Insertion
Switch
Specifications
Switch type
——————
Contact
arrangement
——————
Travel （mm）
——————
Operating force （N）
——————
Switch ON position
——————
Rotational torque
——————
Rating
——————
Contact resistance
——————
Operating life
——————
Page
302 305 307 308
Encoders Soldering Conditions ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 315
Encoders Cautions ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 316
Note
●Indicates applicability to all products in the series.
＋7
− 4
272
Encoders
List of Varieties
Encoders
Metal
Shaft Ring
Type
Insulated
Shaft Hollow
Shaft
NEW
315
Encoders Metal
Shaft Insulated
Shaft Ring
Type
Hollow
Shaft
Soldering surfacetemperature
Soldering temperature
Heating time Soldering time No. of solders
EC10E, EC12D, EC12E, EM11B
EC45A
EC40A
EM20B
EC09E, EC11B, EC111, EC11E, EC11G,
EC11K, EC18A, EC21A, EC28A, EC35A,
EC35AH, EC35B, EC50A, EC60B
Series
10 0 ℃ m a x . 260±5℃2 min. max. 5 ±1s 2 times max.
10 0 ℃ m a x .
10 0 ℃ m a x .
110 ℃ m a x .
80℃ max.
260±5℃
260℃ max.
260℃ max.
260℃ max.
1 min. max.
2 min. max.
1 min. max.
1 min. max.
3 ±1s
5s max.
10 s ma x .
3s max.
2 times max.
2 times max.
1 time
2 times max.
Preheating Dip soldering
Reference for Dip Soldering
Example of Reflow Soldering Condition
Reference for Manual Soldering
Temperature profile
1. When using an infrared reflow oven, solder may sometimes not be applied. Be sure to use a hot air reflow oven or a
　 type that uses infrared rays in combination with hot air.
2. The temperatures given above are the maximum temperatures at the terminals of the encoder when
employing a hot air reflow method. The temperature of the PC board and the surface temperature of the
　 encoder may vary greatly depending on the PC board material, its size and thickness. Ensure that the surface
　 temperature of the encoder does not rise to 250℃ or greater.
3. Conditions vary to some extent depending on the type of reflow bath used. Be sure to give due consideration to this
　 prior to use.
注記
300
200
100
A
B
C
Time (s)
G max.
F max.
H max.
E max.
Room
temperature
Temperature (˚C )
Pre-heating
D
Encoders Soldering Conditions
3 s
EC11J
EC05E, EC09E, EC10E, EC111, EC11B,
EC11E, EC11G, EC11K, EC12D, EC12E,
EC18A, EC21A, EC28A, EC35A, EC35AH,
EC35B, EC40A, EC45A, EC50A, EC60B,
EM11B, EM20B, EC21C, EC28C, EC35CH
Series
350℃ max. 3s max. 1 time
3 5 0 ±10 ℃ 2 times
Tip temperature Soldering time No. of solders
＋1
　0
EC05E
EC21C
EC28C, EC35CH
EC11J
Series
260℃ 230℃ 18 0 ℃ 15 0 ℃ 2 min. max. 3s 40s 4 min. max. 2 times max.
250℃ min.
230℃ to 245℃
260℃
230℃ min.
220℃
230℃
18 0 ℃
200℃
18 0 ℃
15 0 ℃
15 0 ℃
15 0 ℃
60s to 120s
60s to 120s
2 min. min.
ー
ー
3s
30s to 40s
25s to 60s
40s
ー
300s max.
230s max.
2 times max.
1 time max.
1 time max.
A B C D E F G H No. of reflows