ALPS RK203

Metal Shaft Potentiometer
20mm Size Metal Shaft Type
RK203/EC20A Series
Heavy rotation torque and good operational feel, available in potentiometer and encoder type.
Typical Specifications
Rotary
Potentiometers
Specifications
Slide
Potentiometers
Items
Potentiometer
Encoder
0.05W
1mA 5V DC
Rating
Operating life
30,000cycles
Products Line
Potentiometer
Metal
Shaft
Operating section
Length of
operating section
(mm)
Flat
30
Insulated
Shaft
Knob
Operating
Detent
torque
(mN・m)
Number
of detent
Depending on individual
specification
Rotational Operating
angle
direction
240$max
Minimum
order unit
(pcs.)
Products No.
Drawing
No.
400
RK2031110
1
Minimum
order unit
(pcs.)
Products No. Drawing
No.
Vertical
Encoder
Operating
section
Flat
Detent
Length of
torque
operating section
(mN・m)
(mm)
30
40±20
Number
of
detent
18
Number Travel of push- Operating
of pulse on switch(mm) direction
18
Vertical
1.5
EC20A1820401
2
EC20A1824401
3
400
Notes
1. All the potentiometer types can be customized. Contact us with the detailed specifications if you have such
requirements.
2. The same size of the non-switch type can be used as an encoder type. The switch type is an incremental encoder
type only.
352
Metal Shaft Potentiometer
20mm Size Metal Shaft Type RK203/EC20A Series
Dimensions
Unit:mm
Photo
Style
12
18.4
Slide
Potentiometers
1.5
3.5
NC NC NC 3
2 1
2
ø3
15.5
10
1.5
9
C1
M9×0.75
8.3
4.5
ø6
19.2
2.6
10
Rotary
Potentiometers
ø20.2
30
8
9
3.5
Mounting
surface
2.5
RK203
Without switch type,
Potentiometer type
PC board mounting
hole dimensions
(Viewed from mounting side)
3
1
1.5
NC
3-ø1.2holes
1.25
6.25
3.75
3-1
(17.8)
¿20.2
12
Metal
Shaft
A C B NCNC NC
¿3
15.5
A
1.5
B
C
Insulated
Shaft
10
C1
M9G0.75
1.5
3.5
1.5
8.3
4.5
¿6
18.4
9
30
2.6
10
19.2
8
9
3.5
Mounting
surface
2.5
EC20A
Without switch type,
Incremental type
3-ø1.2 holes
Knob
Operating
1.25
3.75
3-1
(17.8)
18.4
G
5
2.6
D
1.5
E
10
9
7
"#$$%
&#'
EC20A
With push-on switch
(travel 1.5mm),
Incremental type
6.25
ACB
5–ø1.2 holes
1.25
3.75
6.25
!
353
Metal Shaft Potentiometers
List of Varieties
Type
Rotary
Potentiometers
20mm size
metal shaft
27mm size
metal shaft
Number of drive shafts
Model
50mm size
metal shaft highquality-audio
Rotary motor-driven
Single-shaft
RK203 / EC20A
RK2711
RK5011□A
RK1681□ / MG0
RK2711□MC0
Slide
Potentiometers
Photo
The bushing can be
Fixing method of bushing fastened
by use of screws Bushing screw clamp
Terminal mounting
Vertical type
Horizontal type
Attached switch
Without
Gang error applicable to
Dual-unit parts for audio
volume control purposes
Insulated
Shaft
Knob
Operating
Solder heat
resistance
Metal
Shaft
The bushing can be fastened by use of screws
Manual
soldering
300℃ max. 3s
max.
Dip soldering
260±5℃, 5±1s
−60dB to 0dB
3dB max.
−100dB to 0dB
2dB max.
350℃ max. 5s
max.
350±10℃, 5
+1
0
s
−40dB to 0dB
3dB max.
−60dB to 0dB
3dB max.
350℃ max. 3s max.
350℃ max. 5s max.
Motor terminal : 350$max 2s max. Motor terminal:350℃ max. 2s max.
260±5℃, 5±1s
Reflow soldering
Operating temperature range
−10℃ to +70℃
−30℃ to +80℃
Rated power
0.05W
0.1W
R≦10kΩ 20Ωmax.
10kΩ<R≦50kΩ 30Ωmax.
50kΩ<R
Nominal total resistance of 0.1% or less
Maximum
attenuation
(Volume
control)
5kΩ≦R< 10kΩ 70dB min.
10kΩ≦R< 50kΩ 80dB min.
50kΩ≦R<100kΩ 90dB min.
100kΩ≦R
100dB min.
R≦10kΩ
20Ωmax.
10kΩ<R≦50kΩ 30Ωmax.
50kΩ<R
Nominal total resistance of 0.1% or less
120dB min.
Insulation
resistance
100MΩ min. 250V DC
100MΩ min. 500V DC
Voltage proof
300V AC
for 1minute
500V AC for 1minute
Mechanical
performance
Stopper strength(N・m)
0.5
Environmental
performance
Electrical performance
Residual
resistance
Cold
Push-pull strength
100N max.
Damp heat
Page
5kΩ ≦R<
10kΩ ≦R<
50kΩ ≦R<
100kΩ ≦R
10kΩ
50kΩ
100kΩ
70dB min.
80dB min.
90dB min.
100dB min.
100MΩ min. 250V DC 100MΩ min. 500V DC
300V AC
for 1minute
500V AC
for 1minute
1.5
0.9
150N max.
100N max.
10 to 55 to 10Hz/min., the amplitude is 1.5mm for all the frequencies,
in the 3 direction of X, Y and Z and for 2 hours respectively
Vibration
Dry heat
0.9
0.05W
−40±2℃ for 192h −30±3℃ for 96h −20±3℃ for 240h
85±2℃ for 192h
70±2℃ for 96h
70±2℃ for 240h
60±3℃,
40±2℃,
60±2℃,
90 to 95%RH for 240h 90 to 95%RH for 96h 90 to 95%RH for 240h
352
354
358
−20±2 for 96h
−30±3℃ for 96h
70±2℃ for 96h
40±2℃,
90 to 95%RH for 96h
360
● Metal Shaft Potentiometers Attached Parts ………………………………………………………………………………363
● Metal Shaft Potentiometers Cautions …………………………………………………………………………………364, 365
322