Features
n Essentially infinite resolution
n Excellent rotational life
n High quality, rugged construction
n General purpose applications
n Non-standard features available
n Cost and space saving
Electrical Characteristics1
6539/6639 - Precision Potentiometer
6539 Servo Mount
6639 Bushing Mount
Standard Resistance Range................ 1 K to 100 K ohms......................1 K to 100 K ohms
Total Resistance Tolerance................... ±15 %..........................................±15 %
Independent Linearity........................... ±2.0 %.........................................±2.0 %
Effective Electrical Angle...................... 340 ° +3 °....................................340 ° +3 °
End Voltage.......................................... 0.5 % maximum..........................0.5 % maximum
Output Smoothness.............................. 0.1 %...........................................0.1 %
Dielectric Withstanding Voltage (MIL-STD-202, Method 301)
Sea Level.......................................... 750 VAC minimum......................750 VAC minimum
Power Rating (Voltage Limited By Power Dissipation or 300 VAC, Whichever is Less)
+70 °C............................................... 1.0 watt.......................................1.0 watt
+125 °C............................................. 0 watt..........................................0 watt
Insulation Resistance (500 VDC)......... 500 megohms minimum..............500 megohms minimum
Resolution............................................ Essentially infinite.......................Essentially infinite
Product Dimensions
6539
12.70 ± .38
(.500 ± .015)
1.57
(.062)
1.57
(.062)
1.57
(.062)
19.81
(.780)
DIA.
.51
(.020)
REF
12.70 ± .79
(.500 ± .031)
3.18
(.125)
6639
10.317+.000/-.051 DIA.
(.4062+.000/-.002)
6.342+.000/-.008
DIA.
(.2497+.000/-.0003)
6.342+.000/-.008
(.2497+.0000/-.0003)
DIA. SHAFT
.25 CHAMFER
45° ± 5 ° x (.010)
11.25 ± .38
(.443 ± .015)
1.57
(.062)
1.19
1.60
SLOT (.047) X (.063)
22.23
(.875)
DIA.
Mechanical Characteristics1
Mechanical Angle...........................................................Continuous, Stops (340 ° +8 °, -0 °) available
Stop Strength (applies to -301 with mechanical stops only)...................................22.6 N-cm (2 lb.-in.)
Torque (Starting & Running)2....................................................................0.40 N-cm (0.5 oz.-in.) max.
Mounting...............................................................................170-200 N-cm (15-18 lb.-in.) maximum
Shaft Runout.................................................................................................0.13 mm (0.005 in.) T.I.R.
Lateral Runout...............................................................................................0.08 mm (0.003 in.) T.I.R.
Shaft End Play...............................................................................................0.13 mm (0.005 in.) T.I.R.
Shaft Radial Play...........................................................................................0.13 mm (0.005 in.) T.I.R.
Pilot Diameter Runout.................................................................................0.06 mm (0.0025 in.) T.I.R.
Backlash........................................................................................................................ 0.1 º maximum
Weight........................................................ 18 gm (6539 Servo Mount), 24 gm (6639 Bushing Mount)
Terminals.................................................................................................................... Rear Turret Type
Soldering Condition
Manual Soldering..................................96.5Sn/3.0Ag/0.5Cu solid wire or no-clean rosin cored wire
370 °C (700 °F) max. for 3 seconds
Wave Soldering......................................................... 96.5Sn/3.0Ag/0.5Cu solder with no-clean flux
260 °C (500 °F) max. for 5 seconds
Wash processes...................................................................................................Not recommended
Marking.................................................. Manufacturer’s name and part number, resistance value and
tolerance, linearity tolerance, wiring diagram, and date code.
Ganging (Multiple Section Pots)................................................................................... 1 cup maximum
Hardware (6639 only).................................. One lockwasher (H-37-2) and one mounting nut (H-38-2)
is shipped with potentiometer.
19.050+ 000/-.012
(.750+.0000/-.0005)
22.23
(.875)
DIA.
Environmental Characteristics1
Operating Temperature Range............. +1 °C to +125 °C.........................-40 °C to +125 °C
Storage Temperature Range................ -65 °C to +125 °C........................-65 °C to +125 °C
Temperature Coefficient
Over Storage Temperature Range....... ±500 ppm/°C maximum..............±500 ppm/°C maximum
Vibration............................................... 15 G............................................15 G
Wiper Bounce................................... 0.1 millisecond maximum............0.1 millisecond maximum
Total Resistance Shift....................... ±10 %..........................................±10 %
Voltage Ratio Shift............................ ±0.5 %.........................................±0.5 %
Shock................................................... 50 G............................................50 G
Wiper Bounce................................... 0.1 millisecond maximum............0.1 millisecond maximum
Total Resistance Shift....................... ±5 %............................................±5 %
Voltage Ratio Shift............................ ±0.5 %.........................................±0.5 %
Load Life............................................... 1,000 hours, 1 watt.....................1,000 hours, 1 watt
Total Resistance Shift....................... ±10 %..........................................±10 %
Rotational Life (No Load)..................... 10,000,000 shaft revolutions.......10,000,000 shaft revolutions
Total Resistance Shift....................... ±10 % maximum.........................±10 % maximum
Moisture Resistance (MIL-STD-202, Method 106)
Total Resistance Shift....................... ±15 %..........................................±15 %
IP Rating............................................... IP 40............................................IP 40
3.170 +.000/-.008
(.1248+.0000/-.0003)
DIA. SHAFT
.25
45° ± 5 ° x
(.010)
CHAMFER
.25
(.010)
REF
9.53 ± .79
(.375 ± .031)
22.23 ± .76
(.875 ± .03)
3/8 " - 32 UNEF
3.18
(.125)
5.537+.000/-.254
(.218+.000/-.010)
9.652 ± .254
(.380 ± .010)
.381
R (.015)
MAX.
Flatted Shaft
Option
65/6639
UR
BO NS
2
4.83
R
(.19)
CW
3
1At room ambient: +25 °C nominal and 50 % relative humidity nominal, except as noted.
22.82 N-cm (4.0 oz.-in.) max. at -40 °C.
1
30 °±3 °
TYP.
TOLERANCES: EXCEPT WHERE NOTED
.51 .13
DECIMALS: .XX ±
.XXX ±
(.020)
(.005)
FRACTIONS: ±1/64
MM
DIMENSIONS:
(IN.)
WARNING Cancer and Reproductive Harm - www.P65Warnings.ca.gov
*RoHS Directive 2015/863, Mar 31, 2015 and Annex.
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of
this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
2
CCW
WIPER
3
1
CLOCKWISE
CW
.25
(.010)
REF
9.53 ± .79
(.375 ± .031)
22.23 ± .76
(.875 ± .03)
3/8 " - 32 UNEF
3.18
(.125)
5.537+.000/-.254
(.218+.000/-.010)
9.652 ± .254
(.380 ± .010)
.381
R
(.015)
MAX.
Flatted Shaft
Option
6539/6639 - Precision Potentiometer
65/6639
Standard Resistance
Table
2
Recommended Part Numbers
Part Number
6539S-1-102
6539S-1-502
6539S-1-103
UR
BO NS
Resistance (Ω)
1,000
5,000
10,000
Part Number
6639S-1-RC
6639S-2-RC
6639S-3-RC
6639S-4-RC
6639S-5-RC
6639S-6-RC
6639S-7-RC
6639S-8-RC
BOLDFACE LISTINGS ARE IN STOCK AND READILY
AVAILABLE THROUGH DISTRIBUTION.
FOR OTHER OPTIONS CONSULT FACTORY.
Mechanical
Stop
No
No
No
No
Yes
Yes
Yes
Yes
Shaft
No
No
Yes
Yes
Yes
Yes
No
No
Slotted
Flatted
Slotted
Flatted
Slotted
Flatted
Slotted
Flatted
R
Resistance Resistance
(.19)
3
1
(Ohms)
Code
1,000 102
2,000
202
5,000
502
10,000
103
30 °±3 °
TYP.
20,000
203
50,000
503
TOLERANCES: EXCEPT WHERE NOTED
100,000
104
.51 .13
DECIMALS: .XX ±
.XXX ±
(.020)
(.005)
FRACTIONS: ±1/64
MM
2.46 - 3.81
DIMENSIONS:
Schematic
(IN.)
(.097 - .150)
OPTIONAL A/R LUG
1.14
1.59 ± .025
X
(.045)
(.0625 ± .0010)
FROM MOUNTING SURFACE ON
7.92
RADIUS
(.312)
2.46 - 3.81
(.097 - .150)
4.83
CW
A/R Lug
2
CCW
1
WIPER
3
PANEL
CLOCKWISE
CW
HEX NUT
PANEL
MM
DIMENSIONS:
(IN.)
HEX NUT
Panel Thickness Dimensions
LOCKWASHER
POT
(For Bushing Mount Only)
2.46 - 3.81
(.097 - .150)
LOCKWASHER
POT
10.44 ± .07
DIA.
(.411 ± .003)
PANEL
HEX NUT
10.44 ± .07
DIA.
(.411 ± .003)
Panel thickness and hole diameters are
recommended for best fit. However, customers
may adjust the dimensions to suit their specific
application.
Panel thickness and hole diameters are
LOCKWASHER
recommended for best fit. However, customers
may adjust the dimensions to suit their specific
application.
DIMENSIONS:
MM
(INCHES)
TOLERANCES: ±
DIMENSIONS:
MM
(INCHES)
TOLERANCES: ±
0.127
(.005)
POT
0.127
(.005)
10.44 ± .07
DIA.
(.411 ± .003)
REV. 06/20
7.93
Specifications are subject to change without notice.
R
(.312)
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
ADDITIONAL HOLE FOR
ANTIROTATION PIN
1.78 +.07/-.02
DIA.
(.070 +.003/-.001)
Legal Disclaimer Notice
This legal disclaimer applies to purchasers and users of Bourns® products manufactured by or on behalf of Bourns, Inc. and its
affiliates (collectively, “Bourns”).
Unless otherwise expressly indicated in writing, Bourns® products and data sheets relating thereto are subject to change
without notice. Users should check for and obtain the latest relevant information and verify that such information is current and
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The characteristics and parameters of a Bourns® product set forth in its data sheet are based on laboratory conditions, and
statements regarding the suitability of products for certain types of applications are based on Bourns’ knowledge of typical
requirements in generic applications. The characteristics and parameters of a Bourns® product in a user application may vary
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C1753 05/17/18R
