381
Rotary
Potentiometers
Slide
Potentiometers
Metal
Shaft
Insulated
Shaft
Knob
Operating
Through
Shaft Type
Ring
Type
PC board mounting hole dimensions
（Viewed from mounting side）
This LED illuminated ring potentiometer is best suited
for knob design of various set devices
39mm Size LED Illuminated Ring Type
RK39A
1. Other varieties are also available. Please inquire.
2. We can also provide LED colors other than the above mentioned. Please contact us if required.
Notes
Packing Specifications
Tray
Refer to P.383 for soldering conditions.
Number of packages（pcs.） Export package
measurements（mm）
1 case / Japan 1 case / export packing
250 500 540×360×380
■Typical Specifications
Items Specifications
Contact resistance
±20%
Maximum operating voltage
50V AC, 30V DC
Total rotational angle
180°±5°, 220°±5°, 270°±5°
(Customizable up to 290°)
Operating life
30,000 cycles
Operating temperature range
−40℃ to ＋85℃
RK39A1A00027
RK39A1A00007
RK39A1A00028
Dimensions Unit:mm
No. Style
2
1
22
3-2.2
3-1.2
3.2
1.2
ø20.2
19
ø39
19
20
8.5
19.7
3
3.7
20°
1.25
Mounting surface
ø24.6
3.5
14.4
2.52.5
22.2
30
2-ø2.6
5
20
2-1.8
5-ø1.2 hole
ø1.5
A
321
K
18.5
40.4
2-3.15
10
30
40.4
18.5
2- 3.15
K 1 2 3 A
Ø1.5
5-Ø 1.2 hole
20
5
10
2- Ø 2.6
2- 1.8
1.25
20°
Product Line
RedB
17
6
2 2 0 °± 5 °
270°
±5°
4 0 ±16
50±20
RK39A1A00007
RK39A1A00027
RK39A1A00028
Product No.
2
1
2
Drawing
No.
LED
Resistance
taper
5kΩ
Total resistance
Number of
positions
Rotational
angle
Detent torque
（mN・m）
250 500
Minimum order unit （pcs.）
Japan Export
1 8 0 °± 5 °
22
3-(2.2)
3-(1.2)
(3.2)
4.4
(1.2)
ø20.2
19
ø39
19
20 12.3
8.5
(19.7)
2-3
2-3.7
ø24.6
5-3.5
(14.4)
2.52.5±0.05
22.2
Mounting
surface
Mounting
surface
22
3-(2.2)
3-(1.2)
(3.2)
4.4
(1.2)
ø20.2
19
ø39
19
20 12.3
8.5
(19.7)
2-3
2-3.7
ø24.6
5-3.5
(14.4)
2.5
2.5
22.2
380
Rotary
Potentiometers
Slide
Potentiometers
Metal
Shaft
Insulated
Shaft
Knob
Operating
Through
Shaft Type
Ring
Type
List of Varieties
Ring Type Potentiometers
Type 39mm size 45mm size
Series
RK39A RK45B RK45C
Single-unit Single-unit Single-unit
Photo
Features
LED illuminate
Dimensions
（mm）
W
39 45
D
39.5 45.5
H
8.5 9.5
Operating temperature range
−40℃ to ＋85℃
Operating life
30,000 cycles
Automotive use
●●●
Life cycle
Electrical
performance
Total
resistance （k Ω）
5
Resistance
taper
B
Rated power
0.05W
Insulation resistance
10 MΩ m i n . 50 V DC
Voltage proof
5 0 V A C f o r 1m in u t e
Mechanical
performance
Detent torque
40±16mN･m
50±20mN･m
55±20mN･m
40±16mN･m 40±16mN･m
Number
of positions
6 , 17 8 , 17 17
Stopper strength
1N･m
Push-pull strength
1 0 0 N（ P u s h ）, 5 0 N（ P u l l ）
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
Terminal type
Insertion
Page
381 382
Ring Type Potentiometers Soldering Conditions ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 383
Potentiometers Cautions ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 418
Potentiometers Measurement and Test Methods ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 420
Potentiometers Resistance Taper ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ 422
Note
●Indicates applicability to all products in the series.
383
Rotary
Potentiometers
Slide
Potentiometers
Metal
Shaft
Insulated
Shaft
Knob
Operating
Through
Shaft Type
Ring
Type
2.5
2-3.7
(22.2)
2.5 19.7
9.5
6-3.5
ø29.6
2-3
ø45
ø25
32
23
24
(1.2)
(3.2)
24
Mounting Surface
1.1
Mounting Surface
(1.2)
3-(2.2)
3-(1.2)
(3.2)
2-3.7
2-3
19.7
9.5 35
46.4
2-φ2.6
21.5
12.5
17.5
22.5
2-3.15
K123A
N
C
23
24
32
φ45
24
φ25
(22.2)
2.5
6-3.5
2.5
φ29.6
23
20°
φ1.5
1.25
6-φ1.2 hole
2- 1.8
1.1
3-(2.2)
3-(1.2)
ø25
24
ø45
22
24
23 14.8
ø29.6
5-3.5
(14.9)
2.52.5
(22.2)
9.5
19.7
2-3
2-3.7
A
321
K
2-3.15
21.5
46.4
35
2-ø2.6
10
5
23
2-1.8
1.25
5-ø1.2hole
ø1.5
Mounting Surface
20°
3-(2.2)
3-(1.2)
(1.2)
(3.2)
4.4
Series
Ring Type Potentiometers / Soldering Conditions
Soldering surface temperature
Heating time
Soldering temperature
Soldering time
RK39A, RK45B, RK45C
RK39A, RK45B, RK45C
Series
350℃ max. 3s max. 1 time
100℃ max. 2min. max. 260℃ max. 5s max. 2 time max.
Tip temperature Soldering time No. of solders
Preheating Dip soldering No. of solders
Reference for Manual Soldering
Reference for Dip Soldering
Dimensions Unit:mm
No. Photo Style PC board mounting hole dimensions
（Viewed from mounting side）
1
RK45B1A00001
(With LED)
2
RK45B1A00002
(With LED)
3
RK45C
(With chip LED)
RK45B/RK45C／45mm Size LED Illuminated Ring Type
