305
Encoders Metal
Shaft Insulated
Shaft Ring
Type
Hollow
Shaft
EC28A
EC28C 28mm Size Ring Type
A low-profile unit with 4mm height and
good operation feel
■Typical Specifications
Items Specifications
Rating
10mA 5V DC
Operating life
50,000 cycles
Operating temperature range
−40℃ to ＋85℃
−40℃ to ＋90℃（EC28C）
Refer to P.315 for soldering conditions.
NEW
3-7.5
3-3
3-4
ø28
3-3.5
ø21.6
15
4
2-3.5
2-1.5
2-2.5
3-R10.2
15
10.75
AB
C
120$
3-3
120$
120$
ø18
ø17
2-2.6
16
2-1.6
28.9
5
23
3-ø1 hole
2-ø1.5 hole
CBA
Product Line
Product No.
EC28A1520401
EC28A1550401
EC28A1560401
EC28A1850402
EC28A1870401
EC28A1560501
EC28C1520401
30 15
18
30
18
15
7±5
12±7
2 0 ±10 400 800
Number of
detent
Number of
pulse
Detent torque
（mN・m）
15
DIP
Actuator length
（mm）
Structure Minimum order unit （pcs.）
Japan Export
12±7
2 0 ±10
2 0 ±10
30 ±15（Initial）
20 ±10（After reflow）
25
15Reflow
1
420
480
840
480
2
3
Drawing
No.
Packing Specifications
Tray
Product No. Number of packages （pcs.）
Export package measurements
（mm）
1 case /Japan
1 case /export packing
EC28A15, EC28A18 400 800 366×509×287
EC28A1560501 420 840 360×540×380
EC28C1520401 480 480 2 90×4 4 0×2 05
Dimensions
PC board mounting hole dimensions
(Viewed from mounting side)
Unit:mm
StyleNo.
1
306
Encoders Metal
Shaft Insulated
Shaft Ring
Type
Hollow
Shaft
2-1.6
2-2.6
28.9
5
16
φ1.5 hole
3
1.5
23
A C B
2-1.5 4
25
3-3.5
2-3.5
3-3
φ21.6
2-2.5
3-14
3-17
120°
120°
120°
15
φ28
3-R10.2
10.75
φ18
φ16
AC B
Y
Y
3-φ1 hole
X X
Y
Y
4
153-2.1
3-2.1
3-4
φ21.6
3-3.1
2-φ1.45
3-7.5
Mounting surface
15 14.5
120°
120°
120°
φ28
10.75
φ17
3-3.05
φ18
3-R10.2
A C B
Dimensions
PC board mounting hole dimensions
(Viewed from mounting side)
Unit:mm
StyleNo.
2
3
2-1.6
2-2.6
28.9
5
16
φ1.5 hole
3
1.5
23
A C B
2-1.5 4
25
3-3.5
2-3.5
3-3
φ21.6
2-2.5
3-14
3-17
120°
120°
120°
15
φ28
3-R10.2
10.75
φ18
φ16
AC B
Y
Y
3-φ1 hole
5V DC
RR
Terminal B
Terminal A
Terminal C
Encoder
Test circuit
tt
V1
V2
5V
ON ONOFF
Output waveform
Sliding direction
t : Masking time to avoid chattering
Measurementcondition：Rotationspeed360˚/s
A signal
B signal ON
ON
OFF
OFF
Detent stability position
CW direction
A signal
B signal ON
ON
OFF
OFF
Detent stability position
CW direction
Sliding Noise
V1=V2=2.5V max.
At R = 5kΩ
Chattering : 5ms max. Bounce : 5ms max.
Output Wave
EC28A15
EC28C15
*Signal A and signal B output
at detent positions cannot be
specified.
EC28A18
EC28A
EC28C 28mm Size Ring Type
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 0V A C f o r 1m i n u t e
or 360V AC for 2s
3 0 0V A C f o r 1m i n u t e
or 360V AC for 1s
3 0 0V A C f o r 1m i n u t e
or 360V AC for 2s
3 0 0V A C f o r 1m i n u t e
or 360V AC for 1s
3 0 0V A C f o r 1m i 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 ±1 0 m N ･ m
30±15mN･m
（Initial）
2 0 ±1 0 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
