330
Rotary
Potentiometers
Slide
Potentiometers
Metal
Shaft
Insulated
Shaft
Knob
Operating
Through
Shaft Type
Ring
Type
Unit:mm
RK203
EC20A
Heavy rotation torque and good operational feel,
available in potentiometer and encoder types
20mm Size Metal Shaft Type
Refer to P.332 for for encoder switch specifications..
Refer to P.332 for attached parts.
Refer to P.343 for soldering conditions.
Products Line
Potentiometer
■Typical Specifications
Items Specifications
Potentiometer Encoder
Rating
0.05W 1mA 5V DC
Total resistance tolerance
±20％ ーー
Maximum operating voltage
50V AC, 30V DC ーー
Operating life
30,000 cycles
Operating temperature range
−40℃ to ＋85℃ −30℃ to ＋80℃
Photo Style PC board mounting hole dimensions
（Viewed from mounting side ）
RK203
Without switch type
Potentiometer type
No.
1
Dimensions
1. Only the encoder type can be supplied with a push-on switch.
2. Shaft design and other features are customizable.
Note
3.75
1.25
6.25
9
10
18.4
1.5
2.6
213
3-ø1.2hole
1.5
10
30
12
4.5
ø6
2.5
3.5
3.5 8
C1
M9×0.75
3-1
(
17.8
)
15.5
19.2
8.3
ø3
1.5 9
1
NC
NC NC
NC
NC
3
2
ø20.2
Mounting
surface
Packing Specifications
Tray
Number of packages （pcs.） Export package measurements
（mm）
1 case /Japan 1 case /export packing
400 800 508×374×272
Operating
section
Length of
operating section
（mm）
Detent torque
（mN・m）
Number of
positions
Rotational
angle
Mounting
direction
Number
of resistor
element
s
Total
resistance
（k Ω）
Resistance
taper
Minimum order unit （pcs.）
Products No
Drawing
No.
Japan Expert
Flat 30
40±20
17 220°
Vertical Single-
unit 10 1B 400 800
RK203111000V
1
518 0 ° RK203111001A
1⇔2 position
40±20
2⇔18 position
2 0 ±10
18
1⇔2
position
25°
2 ⇔18
position
18 0 °
RK203111001B
Encoder (Incremental Type）
Operating
section
Length of
operating section
（mm）
Detent torque
（mN・m）
Number of
positions
Rotational
angle
Mounting
direction
Push on
switch
Travel of push on
switch（mm）
Minimum order unit （pcs.）
Products No
Drawing
No.
Japan Expert
Flat 30
40±20
18 18 Vertical
Without ー
400 800
EC20A1820401
2
2 5 ±10 EC20A1820407
40±20 With 1. 5 EC20A1824401 3
331
Rotary
Potentiometers
Slide
Potentiometers
Metal
Shaft
Insulated
Shaft
Knob
Operating
Through
Shaft Type
Ring
Type
10 1.5
10
12
30 Switch travel
ø6
4.5
C1
2.5
3.5
3.5
1.5
1.5 9
ø20.2
19.2
8.3
15.5
ø3
NC NCBC NC
M9G0.75
A
DE
Mounting
surface
3–1 DE
(SW02)(SW01) (17.8)
2-0.9
Dimensions
EC20A
Without switch type,
Encoder type
EC20A
With push-on switch
(travel 1.5mm),
Encoder type
Photo Style
PC board mounting hole dimensions
（Viewed from mounting side）
1.25
3.75
6.25
9
10
18.4
1.5
2.6
A
3-ø1.2 hole
CB
B
A
D
CB
E
2.6
18.4
5
6.25
3.75
1.25
1.5
10
9
7
5–ø1.2 hole
Unit:mm
1.5
10
30
12
2.5
3.5
8
M9G0.75
4.5
ø6
C1
3-1
(17.8)
ø20.2
15.5
19.2
8.3
ø3
1.5 9
NCNC NC
B
AC
Mounting
surface
3.5
No.
2
3
Output wave （EC20A） Sliding noise （EC20A）
The dotted lines indicate detent positions At R ＝ 5kΩ
Chattering
：8ms max., Bounce：5ms max.
V1=V2=2.5V max.
5V DC
R R
Terminal B
Terminal A
Terminal C
Encoder
Test circuit
t t
V1
V2
5V
ON ONOFF
Output waveform
Sliding direction
t : Masking time to avoid chattering
Measurement condition : Rotation speed 360˚/s
Shaft rotational Direction
Clockwise
ON
A（Terminal A–C）
A（Terminal A–C）
B（Terminal B–C）
B（Terminal B–C）
Signal Output
Counter-clockwise
OFF
ON
OFF
ON
OFF
ON
OFF
※
※
※Signal B output at detent positions is not specified
Circuit Diagram（RK203）
2
3
1
RK203/EC20A / 20mm Size Metal Shaft Type
332
Rotary
Potentiometers
Slide
Potentiometers
Metal
Shaft
Insulated
Shaft
Knob
Operating
Through
Shaft Type
Ring
Type
The attached switch can be used with only encoder types.
Switch type
Momentary push switch
Contact arrangement
Single pole and single throw（Push-on）
Travel（mm）
1.5±0.5
Operating force
4±2N
Operating life
20,000times
Electrical
performance
Rating
0.1A 5V DC (0.1mA 5V DC min. ratings)
Contact resistance
100mΩ max. for initial period, 200mΩ max. after operating life.
Insulation
resistance
10MΩ min. 50V DC
Voltage proof
50V AC for 1 minute or 60V AC for 2 seconds
20mm Size Metal Shaft Encoder Type / Switch Specifications
20mm Size Metal Shaft Type / Attached Parts
The following parts are included with the product.
Nut Washer
11
M9×0.75
2ø14
ø9.1
0.5
Unit:mm
305
Rotary
Potentiometers
Slide
Potentiometers
Metal
Shaft
Insulated
Shaft
Knob
Operating
Through
Shaft Type
Ring
Type
Type 16mm size 20mm size 27mm size 50mm size Rotary motor-driven
Series
RK163 RK203 RK271 RK501 RK168
Single-shaft
Number of resistor elements
Single/dual Single Single/dual/quad Dual/quad
Dual/quad/5-ganged/6-ganged
Photo
Terminal mounting
Horizontal Vertical Horizontal
Fixing method of bushing
Bushing screw clamp
Operating temperature range
−10℃ to ＋70℃ −40℃ to ＋85℃ −10℃ to ＋70℃
Operating life
15,000 cycles 30,000 cycles 15,000 cycles
Available for automotive use
—〇———
Life cycle (availability)
Electrical
performance
Total resistance
（k Ω）
5, 10, 20, 50,
100, 200 10 5, 10, 20, 50,
100, 250 10, 20, 50, 100
Resistance taper
15A, 1B, 3B, 15C B15 A , 3 B
Rated Power
0 .1W
0.05W （15A） 0.05W 0 .1W 0.05W
Residual
resistance
R≦10kΩ 20Ω max.
10kΩ＜R≦50kΩ 30Ω max.
50kΩ＜R＜3MΩ
Nominal total resistance of
0 .1% o r le s s %
—
R≦10kΩ 20Ω max.
10kΩ＜R＜50kΩ 30Ω max.
50kΩ≦R
Nominal total resistance of
0 .1% o r le s s %
— —
Maximum
attenuation
（Volume control）
5kΩ≦R＜ 10kΩ 70dB min.
10kΩ≦R＜ 50kΩ 80dB min.
50kΩ≦R＜100kΩ 90dB min.
10 0 k Ω≦R 10 0 dB mi n .
5kΩ≦R＜ 10kΩ 70dB min.
10kΩ≦R＜ 50kΩ 80dB min.
50kΩ≦R＜100kΩ 90dB min.
100kΩ≦R 100dB min.
12 0 d B m i n .
5kΩ≦R＜ 10kΩ 70dB min.
10kΩ≦R＜ 50kΩ 80dB min.
50kΩ≦R＜100kΩ 90dB min.
100kΩ≦R 100dB min.
Gang error applicable
to Dual-unit parts for
audio volume control
purposes
−40dB to 0dB
3dB max. —
−70dB to −60dB 3dB max.
−60dB to 0dB 2dB max.
−100dB to 0dB
2dB max.
−60dB to −40dB 5dB max.
−40dB to 0dB 3dB max.
Insulation
resistance
100MΩ min. 500V DC 10 MΩ mi n. 25 0 V D C 100MΩ min. 500V DC 10 0 MΩ m i n. 25 0 V D C
Voltage proof
500V AC
f o r 1m i n u t e
300V AC
f o r 1m i n u t e 5 0 0 V A C f o r 1mi n u t e 300V AC
f o r 1m i n u t e
Center-taps
Without
Mechanical
performance
Detent
Without, Cente 17 Without, Center,
21, 31, 41 Without
Stopper strength
0.9 N・m 0.5 N・m 0.9 N・m 1 . 5 N・m 0.9 N・m
Push-pull strength
10 0 N ma x . 150N max. 10 0 N ma x .
Vibration
10 to 55 to 10Hz/min., the amplitude is 1.5mm for all the frequencies,
in the 3 direction of X, Y and Z for 2 hours respectively
Shaft style
Serrated type,
Flat type, Slotted type Flat type Slotted type, Flat type Slotted type Flat type
Terminal style
Insertion, Lead Insertion
Attached switch
—————
Page
325 330 333 337 339
Metal Shaft Potentiometers Soldering Conditions ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・343
Potentiometers Cautions ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 418
Potentiometers Measurement and Test Methods ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 420
Potentiometers Resistance Taper ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 422
Note
○ Indicates applicability to some products in the series.
343
Rotary
Potentiometers
Slide
Potentiometers
Metal
Shaft
Insulated
Shaft
Knob
Operating
Through
Shaft Type
Ring
Type
Reference for Manual Soldering
Example of Reflow Soldering Condition
Reference for Dip Soldering
300
200
100
A
B
C
Time (s)
G max.
F max.
H max.
E max.
Room
temperature
Temperature (˚C )
Pre-heating
D
Series Tip temperature Soldering time No. of solders
RK09L, RK097 350℃ max. 3s max. 1 time
RK203 300℃ max. 3s max. 1 time
RK119 3 5 0 ±10 ℃ 3 s 1 time
RK271 350℃ max. 5s max. 1 time
RK501 3 5 0 ±10 ℃ 5 s 1 time
RK163 350℃ max. 5s max. 1 time
RK168
Potentiometer
terminal 300℃ max. 3s max. 1 time
Motor terminal 350℃ max. 2s max. 1 time
Series
Preheating Dip soldering
No. of solders
Soldering surface
temperature Heating time Soldering
temperature Soldering time
RK09L, RK097, RK203 10 0 ℃ m a x . 2 min. max. 260±5℃ 5 ±1s 2 time max.
RK501 12 0 ±10 ℃ 2 min. max. 260±5℃ 5 ±1s 2 time
+1
0
Series A B C D E F G H No. of reflows
RK119 260℃ 230℃ 18 0 ℃ 15 0 ℃ 2 min. 3s 40s 4 min. 2 time max.
1.
When using an infrared reflow oven, solder may sometimes not be applied. Be sure to use a hot air reflow oven or at type that uses
infrared rays in combination with hot air.
2. The temperatures given above are the maximum temperatures at the terminals of the potentiometer when
employing a hot air reflow method. The temperature of the PC board and the surface temperature of the
potentiometer may vary greatly depending on the PC board material, its size and thickness. Ensure that the surface
temperature of the potentiometer 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.
Notes
Temperature profile
+1
0
Metal Shaft Potentiometers / Soldering Conditions
