*RoHS Directive 2002/95/EC Jan 27 2003 including Annex
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
51/53 - Sealed 1/2 ” (12.5 mm) Square Control
Features
■RoHS compliant*
■Conductive plastic or cermet
■Linear and audio tapers
■PC board and bushing mount
■Gangable
■Metal bushing and shaft
■Sealed for board washing
Electrical Characteristics1Conductive Plastic Cermet
Standard Resistance Range
Linear..................................................................................................1 K ohms to 1 megohm...............................150 ohms to 1 megohm
Audio ..................................................................................................1 K ohms to 1 megohm...............................1 K ohms to 1 megohm
Total Resistance Tolerance
Linear Tapers......................................................................................±10 % or ±20 %..........................................±10 % or ±5 %
Audio Tapers ......................................................................................±10 % or ±20 %..........................................±10 %
Independent Linearity.............................................................................±5 %............................................................±5 %
Absolute Minimum Resistance ...............................................................2 ohms maximum........................................2 ohms maximum
Effective Electrical Angle ........................................................................270 ° ±5 °.....................................................270 ° ±5 °
Contact Resistance Variation .................................................................2 % ..............................................................2 %
Dielectric Withstanding Voltage (MIL-STD-202 – Method 301)
Sea Level............................................................................................1,500 VAC minimum....................................1,500 VAC minimum
70,000 ................................................................................................500 VAC minimum.......................................500 VAC minimum
Insulation Resistance..............................................................................1,000 megohms minimum...........................1,000 megohms minimum
Power Rating At 70 °C (Derate To 0 At 125 °C)
(Voltage Limited By Power Dissipation or 350 VAC, Whichever Is Less)
Linear Tapers......................................................................................0.5 watt........................................................1.0 watt
Audio Tapers ......................................................................................0.25 watt......................................................0.5 watt
Theoretical Resolution............................................................................Essentially infinite ........................................Essentially infinite
Environmental Characteristics1
Operating Temperature Range ...............................................................+1 °C to +125 °C .........................................+1 °C to +125 °C
Storage Temperature Range...................................................................-55 °C to +125 °C........................................-55 °C to +125 °C
Temperature Coefficient Over Storage Temperature Range...................±1,000 ppm/°C............................................±150 ppm/°C
Vibration (Single Section)........................................................................15 G.............................................................15 G
Total Resistance Shift.........................................................................±2 % maximum ...........................................±2 % maximum
Voltage Ratio Shift..............................................................................±5 % maximum ...........................................±5 % maximum
Shock (Single Section)............................................................................30 G.............................................................30 G
Total Resistance Shift.........................................................................+2 % maximum ...........................................±2 % maximum
Voltage Ratio Shift..............................................................................±5 % maximum ...........................................±5 % maximum
Load Life.................................................................................................1,000 hours .................................................1,000 hours
Total Resistance Shift.........................................................................±10 % TRS maximum .................................±5 % TRS maximum
Rotational Life (No Load) ........................................................................50,000 cycles ..............................................25,000 cycles
Total Resistance Shift.........................................................................±10 % TRS maximum .................................±10 % TRS maximum
Contact Resistance Variation @ 25,000 Cycles .................................±2 %............................................................±4 %
Moisture Resistance (MIL-STD-202, Method 103, Condition B)
Total Resistance Shift.........................................................................±10 % TRS ..................................................±5 % TRS
IP Rating .................................................................................................IP 64 ............................................................IP 64
Mechanical Characteristics
Stop Strength..................................................................................................................................................................................................56 N-cm (5 lb.-in.)
Mechanical Angle ........................................................................................................................................................................................................290 ° ±5 °
Torque
Starting (All Sections)............................................................................................................................Running torque +0.35 N-cm (+0.5 oz.-in.) maximum
Running (Single Section) ................................................................................................................................................0.15 to 1.4 N-cm (0.2 to 2.0 oz.-in.)
Running (Dual or Triple Section) ......................................................................................................................................0.35 to 1.8 N-cm (0.5 to 2.5 oz.-in.)
Mounting (Torque on Bushing) ..............................................................................................................................1.7 to 2.0 N-m (15 to 18 lb.-in.) maximum
Weight (Single Section) ................................................................................................................................................................................................5.5 grams
(Each Additional Section) ........................................................................................................................................................................................3.0 grams
Terminals......................................................................................................................................................................................................PC pin or solder lug
Soldering Condition ......................................................................Recommended hand soldering using Sn95/Ag5 no clean solder, 0.025 ” wire diameter.
Maximum temperature 399 °C (750 °F) for 3 seconds. No wash process to be used with no clean flux.
Part can be wave soldered at 260 °C (500 °F) for 5 seconds, no wash process with no clean flux.
Marking ....................................................................................................................Manufacturer’s trademark, part number, resistance value and date code.
Ganging (Multiple Section Potentiometers) ....................................................................................................................................................6 cups maximum
Hardware ............................................One lockwasher and one mounting nut is shipped with each potentiometer, except where noted in the part number.
1At room ambient: +25 °C nominal and 50 % relative humidity nominal, except as noted.
*RoHS COMPLIANT
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
321
(SINGLE, DUAL AND TRIPLE MODULE SHOWN)
AVAILABLE IN 1 THROUGH 6 MODULE VERSIONS.
AVAILABLE IN 1 THROUGH 6 MODULE VERSIONS.
PACKAGE DIMENSIONS PCB MOUNTING BRACKET
PACKAGE DIMENSIONS
MODEL 51
SOLDER LUG TERMINALS
MODEL 53
ELECTRICAL SCHEMATIC
13CW
CCW
2
ANTI-ROTATION LUG
(Style "A", 90 CW Shown)
0.41
(.016)
BUSHING DIAMETER
0.80
( .031)
2.20
(.087)
FOR TOLERANCES SHOWN: .XX = ± (.010)
.XXX = ±
(.005)
SHAFT DIMENSIONS ±
(1/32)
5.70
(.224)
132 ° ± 5 ° CCW END
6.20
(.244)
BUSHING DIAMETER
0.80
( .031)
2.77
(.109)
6.35
(.250)
SHAFT FLAT
ORIENTATION
SUGGESTED PANEL LAYOUTS
The Model 50 can be used with either
of the two panel layouts shown below.
24.15 ± 0.33
(.950 ± .021)
16.51 ± 0.25
(.650 ± .010) 8.89 ± 0.18
(.350 ± .007)
.64
( .025)
"L"
0.30
(.0118) 5.08 ± 0.30
(.200 ± .012)
7.62 ± 0.30
(.300 ± .012)
7.62 ± 0.30
(.300 ± .012)
12.5
(.492)
11.00
(.432) DIA.
0.74
(.029)
6.25
(.246)
7.00
(.275)
6.35 ± 0.25
(.250 ± .010)
.66 ± .05
(.026 ± .002)
3 X
2.54
(.100)
2.54
(.100)
24.13 ± 0.33
(.950 ± .013) .64
( .025)
"L"
5.08 ± 0.30
(.200 ± .012)
7.62 ± 0.30
(.300 ± .012)
0.91 ± .051
(.036 ± .002)
6.35 ± .25
(.250 ± .010)
7.62 ± 0.30
(.300 ± .012)
1.32 ± 0.25
(.052 ± .010)
12.5
(.492)
11.00
(.432) DIA.
0.74
(.029)
6.25
(.246)
7.00
(.275)
6.35 ± 0.25
(.250 ± .010)
.41 ± .05
( .016 ± .002)
2 X
2 X
5.08
(.200)
2.54
(.100)
5.08
(.200)
2.40
(.094)
0.90
(.036)
4.70
(.185)
2 X
1.80
(.071)
5.0 ± 0.51
(.197 ± .002)
0.80 ± 0.30
(.031 ± .012) 1.52
(.060)
.25
.13
.80
( .100)TERMINAL SPACING
2.54
51/53 - Sealed 1/2 ” (12.5 mm) Square Control
DIMENSIONS ARE: MM
(INCHES)
Product Dimensions
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
OPT.
3/8-32UNEF-2A
1/4-32UNEF-2A
3/8-32UNEF-2A
1/4-32UNEF-2A
M6 X .075-6g
M7 X .075-6g
M10 X 0.75-6g
9.53
(.375) 1.60 ± 0.25
(.063 ± .010)
OPT.
1.194 ± 0.10
(.047 ± .004)
SHAFT
6.35
(.250) BUSHING
9.53
(.375)
OPT.
6.35
(.250) 0.79 ± 0.25
(.031 ± .010)
OPT.
0.79 ± 0.10
(.031 ± .004)
SHAFT
3.18
(.125) BUSHING
6.35
(.250)
OPT.
9.53
(.375) 1.52 ± 0.25
(.060 ± .010)
OPT.
5.49 ± 0.10
(.216 ± .005)
SHAFT
6.35
(.250) BUSHING
9.53
(.375)
MAX. FLAT LENGTH 15.88
(.625)
OPT.
12.70
(.500) 0.79 ± 0.25
(.031 ± .010)
OPT.
.031 ± .004
(0.79 ± 0.10)
SHAFT
.125
(3.18) BUSHING
.250
(6.35)
.315
(8.0) 1.52 ± 0.25
(.060 ± .010)
0.79 ± 0.10
(.031 ± .004)
SHAFT
3.0
(.118) BUSHING
6.0
(2.36)
8.0
(.315) 1.52 ± 0.25
(.060 ± .010)
0.79 ± 0.10
(.031 ± .004)
SHAFT
4.0
(.157) BUSHING
7.0
(2.75)
9.5
(.374) 1.80 ± 0.25
(.071 ± .010)
1.00 ± 0.10
(.039 ± .004)
SHAFT
6.0
(.236) BUSHING
10.0
(.394)
A Style Bushing
STD. LENGTH ‘L’
.500 (12.7)
.625 (15.88)
.750 (19.05)
.875 (22.23)
1.000 (25.4)
C Style Bushing
STD. LENGTH ‘L’
.375 (9.53)
.500 (12.7)
.625 (15.88)
.750 (19.05)
.875 (22.23)
1.000 (25.4)
F Style Bushing
STD. LENGTH ‘L’
.625 (15.88)
.750 (19.05)
.875 (22.23)
1.000 (25.4)
S Style Bushing
STD. LENGTH ‘L’
.394 (10.0)
.512 (13.0)
.630 (16.0)
.866 (22.0)
.984 (25.0)
U Style Bushing
STD. LENGTH ‘L’
.394 (10.0)
.512 (13.0)
.630 (16.0)
.866 (22.0)
.984 (25.0)
R Style Bushing
STD. LENGTH ‘L’
.512 (13.0)
.630 (16.0)
.866 (22.0)
.984 (25.0)
A Style Bushing -
Flatted Shaft
STD. LENGTH ‘L’
.625 (15.88)
.750 (19.05)
.875 (22.23)
1.000 (25.4)
51 A A D - B 28 - A 15 L
MOUNTING BRACKET/
ANTI-ROTATION LUG
Code Description
A AR Lug 90 °CW
C AR Lug 270 °CW
D No AR Lug or Bracket
L Front Bracket
M Rear Bracket
N Front and Rear Bracket
How To Order
# SECTIONS/DETENTS
Code Description
A Single No Detent
B Double No Detent
C Triple No Detent
D Quad No Detent
E Single w/Center Detent
F Double w/Center Detent
G Triple w/Center Detent
H Quad w/Center Detent
J Five Section
K Six Section
L Five Section w/Detent
M Six Section w/Detent
BUSHING CONFIGURATION
Code Description
A 3/8 ”D x 3/8 ”L
C 1/4 ”D x 1/4 ”L
F 1/4 ”D x 1/2 ”L
R 10 mmD x 9.5 mmL
S 6 mmD x 8 mmL
U 7 mmD x 8 mmL
MODEL
Code Description
51 PC Pins (.100 ” centers)
53 Solder Lugs
AVAILABLE ONLY IN
SHAFT TYPE BUSHINGS LENGTHS
Code Description Code Description
A Single Plain 1/4 ”D A 20,24,28,32
B Single Slotted 1/4 ”D A 12,16,20,24,28,32
C Single Flatted 1/4 ”D A 20,24,28,32
D Single Plain 1/8 ”D C, F 16,20,24,28,32
E Single Slotted 1/8 ”D C, F 12,16,20,24,28,32
R Single Slotted 6 mmD R 10,13,16,22,25
T Single Slotted 4 mmD U 10,13,16,22,25
U Single Slotted 3 mmD S 10,13,16,22,25
ELEMENT TAPER RESISTANCE
TYPE/TOLERANCE (CODE)
Code Description VALUE IN OHMS
(A) Linear Cermet ±10 % (28) — 150 (14) — 7.5 K
(H) Linear Cermet ±5 % (06) — 200 (15) — 10 K
(07) — 250 (30) — 15 K
(08) — 500 (16) — 20 K
(09) — 750 (17) — 25 K
(10) — 1 K (18) — 50 K
(29) — 1.5 K (19) — 75 K
(11) — 2 K (20) — 100 K
(12) — 2.5 K (23) — 500 K
(13) — 5 K (25) — 1 M
(B) Linear C-P ±20 % (10) — 1 K (18) — 50 K
(E) Linear C-P ±10 % (12) — 2.5 K (20) — 100 K
(13) — 5 K (22) — 250 K
(15) — 10 K (23) — 500 K
(16) — 20 K (25) — 1 M
(17) — 25 K
(C) CW Audio Cermet (10) — 1 K (18) — 50 K
±10 % (12) — 2.5 K (20) — 100 K
(F) CCW Audio Cermet (13) — 5 K (23) — 500 K
±10 % (15) — 10 K (25) — 1 M
(17) — 25 K
(D) CW Audio C-P ±20 % (10) — 1 K (18) — 50 K
(S) CW Audio C-P ±10 % (12) — 2.5 K (20) — 100 K
(13) — 5 K (22) — 250 K
(15) — 10 K (23) — 500 K
(17) — 25 K (25) — 1 M
(G) CCW Audio C-P (10) — 1 K (18) — 50 K
±20 % (12) — 2.5 K (20) — 100 K
(T) CCW Audio C-P (13) — 5 K (22) — 250 K
±10 % (15) — 10 K (23) — 500 K
(17) — 25 K (25) — 1 M
(Y) CW Dual Audio (10) — 1 K (18) — 50 K
Taper C-P ±20 % (12) — 2.5 K (20) — 100 K
(13) — 5 K (22) — 250 K
(15) — 10 K (23) — 500 K
(17) — 25 K (25) — 1 M
SHAFT AVAILABLE
LENGTH ONLY IN
(FMS) BUSHING
Code Description Code
12 3/8 ” B, C
16 1/2 ” A, C
20 5/8 ” A, C, F
24 3/4 ” A, C, F
28 7/8 ” A, C, F
32 1 ” A, C, F
Metric
10 10 mm R, S, U, T
13 13 mm R, S, U, T
16 16 mm R, S, U, T
22 22 mm R, S, U, T
25 25 mm R, S, U, T
Boldface features are Bourns standard options.
All others are available with higher minimum
order quantities.
51/53 - Sealed 1/2 ” (12.5 mm) Square Control
Shaft/Bushing Styles
DIMENSIONS ARE: MM
(INCHES) REV. 08/09
RoHS IDENTIFIER
Code Description
L Compliant
