Features
■ Wirewound and Hybritron® elements
■ High rotational life
■ Optional 0.1 % linearity
■ Optional A/R lug
■ RoHS compliant*
■ Suitable for use under side load
■ Designed for HMI and MMI applications
■ Dual gang option
■ Servo mount option
3549 - 10-Turn Precision Potentiometer
*RoHS Directive 2002/95/EC Jan 27, 2003 including Annex.
Specifi cations are subject to change without notice.
Customers should verify actual device performance in their specifi c applications.
Electrical Characteristics1 Wirewound Element Hybritron® Element
Standard Resistance Range..................................................................100 to 100K ohms ..................................................1K to 100K ohms
Total Resistance Tolerance ....................................................................±3 % .......................................................................±10 %
Independent Linearity ............................................................................±0.2 % ....................................................................±0.2 %
Independent Linearity (Maximum Practical) ..........................................±0.1 % ....................................................................±0.1 %
Effective Electrical Angle .......................................................................3600 ° +10 °, -0 ° ....................................................3600 ° +10 °, -0 °
Absolute Minimum Resistance/End Voltage ..........................................1 ohm or 0.1 % maximum ......................................0.2 % maximum
(whichever is greater)
Noise/Output Smoothness ....................................................................100 ohms maximum ...............................................0.10 % maximum
Max. Wiper Current @ 5K ohms ...........................................................20 mA .....................................................................10 mA
Dielectric Withstanding Voltage (MIL-STD-202, Method 301)
Sea Level ...........................................................................................1,000 VAC minimum .............................................. 1,000 VAC minimum
Insulation Resistance (500 VDC) ..........................................................1,000 megohms minimum ...................................... 1,000 megohms minimum
Resolution..............................................................................................See How to Order chart ........................................ Essentially infi nite
Power Rating (Voltage Limited By Power Dissipation)
+70 °C ................................................................................................2 watts .................................................................... 2 watts
+125 °C ..............................................................................................0 watt ...................................................................... 0 watt
Environmental Characteristics1
Operating Temperature Range
Dynamic .............................................................................................-40 °C to +125 °C ................................................... -40 °C to +125 °C
Static ..................................................................................................-55 °C to +125 °C ................................................... -55 °C to +125 °C
Temperature Coeffi cient (Over Static Temperature Range) ..................±50 ppm/°C ............................................................ ±100 ppm/°C
Temperature Cycling (5 Cycles Over Static Temperature Range) .........±2 % TR shift max. .................................................±4 % TR shift max.
Vibration (15 Gs, 10 Hz to 2 kHz)
Wiper Bounce ....................................................................................0.1 ms max. ............................................................ 0.1 ms max.
Shock (100 Gs, 6 ms sawtooth)
Wiper Bounce ....................................................................................0.1 ms max. ............................................................ 0.1 ms max.
Load Life (1,000 hours @ 70 °C) ...........................................................±2 % TR shift .......................................................... ±5 % TR shift max.
Rotational Life
No Load .............................................................................................2,000,000 shaft revolutions ................................... 5,000,000 shaft revolutions
Powered (MIL-PRF-12934)................................................................2,000,000 shaft revolutions ...................................5,000,000 shaft revolutions
Moisture Resistance (Mil-Std-202, Method 103) ...................................±2 % TR shift max. ................................................. ±5 % TR shift max.
IP Rating ................................................................................................IP 50 ....................................................................... IP 50
Mechanical Characteristics1
Mechanical Angle ...........................................................................................................................................................................................3600 ° +10 °, -0 °
Backlash ....................................................................................................................................................................................................................1.0 ° max.
Stop Strength.......................................................................................................................................................................................53 N-cm (75 oz-in.) min.
Torque
Starting ........................................................................................................................................................................................0.5 N-cm (0.7 oz.-in.) max.
Running .......................................................................................................................................................................................0.5 N-cm (0.7 oz.-in.) max.
Clutch................................................................................................................................................................................1.0 to 4.2 N-cm (1.5 to 6.0 oz.-in.)
Mounting .......................................................................................................................................................................... 170-200 N-cm (15-18 in.-lb.) max.
Shaft Runout T.I.R. ..................................................................................................................................................................................... 0.08 mm (0.003 in.)
Lateral Runout T.I.R. ................................................................................................................................................................................... 0.13 mm (0.005 in.)
Shaft End Play T.I.R. .................................................................................................................................................................................. 0.15 mm (0.006 in.)
Shaft Radial Play T.I.R. ............................................................................................................................................................................... 0.08 mm (0.003 in.)
Pilot Diameter Runout T.I.R. ....................................................................................................................................................................... 0.08 mm (0.003 in.)
Weight
Single ...................................................................................................................................................................................................... 20 gm (0.7 oz.) typ.
Dual ....................................................................................................................................................................................................... 36 gm (1.27 oz) typ.
Shaft Side Load (Max. Allowable)
Nickel Plated Brass Shaft w/Brass Bushing ................................................................................................................................................. 50 gmf (1.7 ozf)
Stainless Steel Shaft w/Bronze Bushing .................................................................................................................................................... 250 gmf (8.8 ozf)
Terminals .............................................................................................................................................................................................. Gold-plated solder lugs
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 fl ux, 260 °C (500 °F) max. for 5 seconds
Wash processes .......................................................................................................................................................................................Not recommended
Mounting Hardware ............................................................................................. One lockwasher and one mounting nut is shipped with each potentiometer
Recommended Panel Thickness (Bushing Mount) ..................................................................................................................2.46-3.81 mm (0.097-0.150 in.)
Marking ...........................................................................................................................Manufacturer’s symbol, model number, product code and date code
Standard Packaging ...........................................................................................................................................................................Plastic trays (5 pcs./tray)
1At room ambient: +25 °C nominal and 50 % relative humidity nominal, except as noted.
For other options, please consult factory.
*RoHS COMPLIANT
Specifi cations are subject to change without notice.
Customers should verify actual device performance in their specifi c applications.
3549 - 10-Turn Precision Potentiometer
Product Dimensions
Single Gang, Bushing Mount Dual Gang, Bushing Mount
30 ° ± 5 °
12.649 ± 0.254
(.498 ± .010)
MOUNTING FACE
16.256
(.640)
MAX.
R
DIA.
DIA.
22.479 ± 0.812
(.885 ± .032)
19.812 ± 0.812
(.780 ± .032)
6.86 ± 0.25
(.270 ± .010)
1.524 ± 0.254
(.060 ± .010)
20.617 ± 0.787
(.812 ± .031)
7.92 ± 0.381
(.312 ± .015)
SHAFT DIMENSION “A”
10.287 + 0.00/-0.05
(.405 +0.00/-.002)
12.7 ± 0.254
(.500 ± .010)
5.715 ± 0.381
(.225 ± .015)
0.762
(.030)
0.813
(.032)
14.046 ± 0.381
(.553 ± .015)
18.446 ± 0.381
(.726 ± .015) MOUNTING SURFACE
BUSHING TYPE “B”
ADJUSTMENT SLOT:
WIDE X 0.813
(.032) DEEP
1.499
(.059)
OPTIONAL ANTI-
ROTATIONAL PIN
AND
7.366
(.290) RADIUS
1.016
(.040)
FROM MOUNTING
SURFACE ON
R
2 1 3
TOLERANCES: EXCEPT WHERE NOTED
DECIMALS: .XX ± .XXX ± .XXXX ±
DIMENSIONS:
13CW
CLOCKWISE
CCW
2WIPER
.50
(.02)
.127
(.005)
.0127
(.0005)
MM
(IN)
Shaft Dimension "A"
6.34 +0/-0.022
(0.2497 +0/-0.0009)
6.00 +0/-0.022
(0.2362 +0/-0.0009)
6.34 +0/-0.007
(0.2497 +0/-0.0003)
6.00 +0/-0.007
(0.2362 +0/-0.0003)
6.34 +0/-0.007
(0.2497 +0/-0.0003)
6.00 +0/-0.007
(0.2362 +0/-0.0003)
Bushing
Selection
Code
A
B
C
D
G
H
Bushing Type "B"
3/8 " 32-UNEF- 2A THD.
M9 X 0.75-8g
3/8 " 32-UNEF- 2A THD.
M9 X 0.75-8g
3/8 " 32-UNEF- 2A THD.
M9 X 0.75-8g
Shaft Material
Nickel Plated Brass
Nickel Plated Brass
Stainless Steel
Stainless Steel
Stainless Steel
Stainless Steel
Bushing Material
Brass
Brass
Bronze
Bronze
Bronze
Bronze
30 ° ± 5 °
12.649 ± 0.254
(.498 ± .010)
MOUNTING FACE
16.256
(.640)
MAX.
R
DIA.
22.479 ± 0.812
(.885 ± .032)
DIA.
6.86 ± 0.25
(.270 ± .010)
1.52
(.060)
20.643 ± 0.787
(.813 ± .031)
7.92 ± 0.381
(.312 ± .015)
SHAFT DIMENSION “A”
10.287 + 0.00/-0.05
(.405 +0.00/-.002)
12.7 ± 0.254
(.500 ± .010)
6.02 ± 0.381
(.237 ± .015)
0.813
(.032)
14.351 ± 0.381
(.565 ± .015)
18.796 ± 0.381
(.740 ± .015)
MOUNTING SURFACE
BUSHING TYPE “B”
ADJ. SLOT:
WIDE X
0.813 ± .0004
(.032 ± .010) DEEP
1.499
(.059)
OPTIONAL ANTI-
ROTATIONAL PIN
AND
7.366
(.290) RADIUS
1.016
(.040)
FROM MOUNTING
SURFACE ON
26.467 ± 0.762
(1.042 ± .030)
34.798 ± 0.762
(1.370 ± .030)
39.243 ± 0.762
(1.545 ± .030)
40.259 ± 0.762
(1.585 ± .030)
22 11 33
13CW
CCW
13CW
CLOCKWISE
CCW
WIPER
2 2
Specifi cations are subject to change without notice.
Customers should verify actual device performance in their specifi c applications.
3549 - 10-Turn Precision Potentiometer
Product Dimensions
Single Gang, Servo Mount Dual Gang, Servo Mount
TOLERANCES: EXCEPT WHERE NOTED
DECIMALS: .XX ± .XXX ± .XXXX ±
DIMENSIONS:
13CW
CLOCKWISE
CCW
2WIPER
.50
(.02)
.127
(.005)
.0127
(.0005)
MM
(IN)
30 ° ± 5 °
16.256
(.640)
MAX.
R
22.225 ± 0.381
(.875 ± .015)
DIA.
25.222 ± 0.787
(.993 ± .031)
6.858 ± 0.254
(.270 ± .010)
1.575
(.062)
1.575
(.062)
1.575
(.062) 9.525 ± 0.787
(.375 ± .031)
3.1699 + .0000/-.0076
(.1248 + .0000/-.0003)
DIA.
DIA.
15.8725 + .0000/-.0127
(.6249 +.0000/-.0005)
DIA.
17.526
(.690)
12.7 ± 0.254
(.500 ± .010)
11.13 ± 0.381
(.438 ± .015)
19.46 ± 0.381
(.766 ± .015)
23.86 ± 0.381
(.939 ± .015) MOUNTING SURFACE
2 1 3
30 ° ± 5 °
16.256
(.640)
MAX.
R
22.225 ± 0.381
(.875 ± .015)
DIA.
6.858 ± 0.254
(.270 ± .010)
1.575
(.062)
1.575
(.062)
1.575
(.062) 9.525 ± 0.787
(.375 ± .031)
3.1699 + .0000/-.0076
(.1248 + .0000/-.0003)
DIA.
DIA.
15.8725 + .0000/-.0127
(.6249 +.0000/-.0005)
DIA.
17.526
(.690)
12.7 ± 0.254
(.500 ± .010)
11.43 ± 0.381
(.450 ± .015)
19.76 ± 0.381
(.778 ± .015)
24.206 ± 0.381
(.953 ± .015) MOUNTING SURFACE
22 11 33
31.88 ± 0.78
(1.255 ± .031)
40.21 ± 0.78
(1.583 ± .031)
44.65 ± 0.78
(1.758 ± .031)
45.67 ± 0.78
(1.798 ± .031)
13CW
CCW
13CW
CLOCKWISE
CCW
WIPER
2 2
“Hybritron” is a registered trademark of Bourns, Inc.
Specifi cations are subject to change without notice.
Customers should verify actual device performance in their specifi c applications.
3549 - 10-Turn Precision Potentiometer
Panel Thickness Dimensions
(For Bushing Mount Only)
PANEL
POT
LOCKWASHER
HEX NUT
2.46 - 3.81
(.097 - .150)
1.60 +.08/-.03
(.063 +.003/-.001)
10.44 ± .07
(.411 ± .003) DIA.
DIA.
ADDITIONAL HOLE FOR
ANTI-ROTATION PIN
MM
(INCHES)
DIMENSIONS:
Anti-rotation pin hole is shown at six o'clock
position for reference only. The actual location is
determined by the customer's application. Refer
to the front view of the potentiometer to see the
location of the optional A/R pin.
Panel thickness and hole diameters are
recommended for best fit. However, customers
may adjust the dimensions to suit their specific
application.
TOLERANCES: ±
7.42
(.292)
R
0.127
(.005)
How To Order
3549S-2AA-103/ 103A
Code
H
S
Description
Hybritron®
Wirewound
ELEMENT TYPE
Code
A
B
Description
None
180 °
ANTI-ROTATION LUG
Code
3549
Description
10-Turn
MODEL DESIGNATOR
Code
1
2
Description
Single
Dual
NO. OF SECTIONS
Code Element Type
Hybritron®
Hybritron®
Hybritron®
Hybritron®
Hybritron®
Hybritron®
Hybritron®
Wirewound
Wirewound
Wirewound
Wirewound
Wirewound
Wirewound
Wirewound
Wirewound
Wirewound
Wirewound
Resolution
—
—
—
—
—
—
—
0.055
0.042
0.031
0.027
0.021
0.021
0.019
0.014
0.011
0.008
RESISTANCE**
Code
A
B
Description
0.20 %
0.10 %
INDEPENDENT LINEARITY
102 (1K ohms)
202 (2K ohms)
502 (5K ohms)
103 (10K ohms)
203 (20K ohms)
503 (50K ohms)
104 (100K ohms)
101 (100 ohms)
201 (200 ohms)
501 (500 ohms)
102 (1K ohms)
202 (2K ohms)
502 (5K ohms)
103 (10K ohms)
203 (20K ohms)
503 (50K ohms)
104 (100K ohms)
** For Single gang, use only first three digits.
For Dual gang, use six digits separated by a "/".
* Anti-rotation lug is not available for
servo mount versions.
*** Not available in dual gang version.
Code
A
B
C
D
G
H
Shaft FMS
13/16 "
20.6 mm
13/16 "
20.6 mm
13/16 "
20.6 mm
Shaft Material
Nickel Plated Brass
Nickel Plated Brass
Stainless Steel
Stainless Steel
Stainless Steel
Stainless Steel
Shaft Dia.
1/4 "
6 mm
1/4 "
6 mm
1/4 "
6 mm
Bushing Dia.
3/8 "
9 mm
3/8 "
9 mm
3/8 "
9 mm
Bushing Material
Brass
Brass
Bronze
Bronze
Bronze
Bronze
Slip Clutch
N/A
N/A
N/A
N/A
Yes***
Yes***
BUSHING MOUNT
Code
E
Shaft FMS
3/8 "
Shaft Material
Stainless Steel
Shaft Dia.
1/8 "
SERVO MOUNT
REV. 10/11
