56

PL
IA
NT
CO
M
*R
oH
S
Features
Applications
■ RoHS compliant*
■ Test and measurement equipment
■ CW or CCW rotary switch
■ Avionics controls
■ Linear and audio tapers
■ Communications equipment
■ PC board and bushing mount
■ Medical laboratory equipment
■ Splash seal
■ Metal bushing and shaft
56 - Sealed 1/2 ” (12.5 mm) Panel Control w/Rotary Switch
Electrical Characteristics1
Standard Resistance Range
Linear ......................................................................................................................................................................................................1K to 500K ohms
Audio .......................................................................................................................................................................................................1K to 500K ohms
Total Resistance Tolerance
B & D Tapers ............................................................................................................................................................................................................ ±20 %
E & S Tapers ............................................................................................................................................................................................................. ±10 %
Independent Linearity ....................................................................................................................................................................................................... ±5 %
Absolute Minimum Resistance ..................................................................................................................................................................... 2 ohms maximum
Effective Electrical Angle ............................................................................................................................................................................................. 240 ° ±5
Contact Resistance Variation ........................................................................................................................................................................................... ±2 %
Dielectric Withstanding Voltage (MIL-STD-202, Method 301)
Sea Level ............................................................................................................................................................................................ 1,500 VAC minimum
70,000 ................................................................................................................................................................................................... 500 VAC minimum
Insulation Resistance ...................................................................................................................................................................... 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
Audio Tapers ........................................................................................................................................................................................................0.25 watt
Theoretical Resolution .................................................................................................................................................................................. Essentially infinite
Environmental Characteristics1
Operating Temperature Range ...................................................................................................................................................................... +1 °C to +125 °C
Storage Temperature Range ........................................................................................................................................................................-55 °C to +125 °C
Temperature Coefficient Over Storage Temperature Range ............................................................................................................................ ±1,000 ppm/°C
Vibration .............................................................................................................................................................................................................................. 8 G
Total Resistance Shift ................................................................................................................................................................................ ±2 % maximum
Voltage Ratio Shift ..................................................................................................................................................................................... ±5 % maximum
Shock ................................................................................................................................................................................................................................ 20 G
Total Resistance Shift ................................................................................................................................................................................ +2 % maximum
Voltage Ratio Shift ..................................................................................................................................................................................... ±5 % maximum
Load Life.................................................................................................................................................................................................................1,000 hours
Total Resistance Shift ...................................................................................................................................................................... ±10 % TRS maximum
Rotational Life (No Load) .....................................................................................................................................................................................50,000 cycles
Total Resistance Shift ...................................................................................................................................................................... ±10 % TRS maximum
Contact Resistance Variation ..................................................................................................................................................................................... ±2 %
Moisture Resistance (MIL-STD-202, Method 103, Condition B)
B & E Taper....................................................................................................................................................................................................... ±10 % TRS
D & S Taper ...................................................................................................................................................................................................... ±20 % TRS
IP Rating
Entire Unit................................................................................................................................................................................................................... IP 64
Shaft/Bushing............................................................................................................................................................................................................. IP 65
Mechanical Characteristics
Stop Strength ............................................................................................................................................................................................... 56 N-cm (5 lb.-in.)
Mechanical Angle ...................................................................................................................................................................................................... 290 ° ±5 °
Torque
Running/Starting ........................................................................................................................................................ 0.2 to 1.3 N-cm (0.25 to 2.0 oz.-in.)
Mounting (Torque on Bushing) .......................................................................................................................... 1.7 to 2.0 N-m (15 to 18 lb.-in.) maximum
Weight ....................................................................................................................................................................................................................... 8.5 grams
Terminals ........................................................................................................................................................................................................................ PC pin
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) .................................................................................... Inquire for availability, minimum order quantity and price.
Hardware ...........................................................................................................One lockwasher and one mounting nut is shipped with each potentiometer.
1At room ambient: +25 °C nominal and 50 % relative humidity nominal, except as noted.
*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.
56 - Sealed 1/2 ” (12.5 mm) Panel Control w/Rotary Switch
Initial Electrical Characteristics - Switch
Switch Type ......................................................................................................................................................................SPDT (Break before make)
Power Rating (Resistive Load) ..........................................................................................................................................................0.5 A @ 30 VDC
Dielectric Withstanding Voltage (MIL-STD-202, Method 301)
Sea Level ................................................................................................................................................................................. 1000 VAC minimum
Insulation Resistance ........................................................................................................................................................ 1000 megohms minimum
Contact Resistance ............................................................................................................................................................... 30 milliohms maximum
Contact Bounce ................................................................................................................................................................. 5 milliseconds maximum
Actuation Angle ................................................................................................................................................................................... 35 ° maximum
Switch Travel ....................................................................................................................................................................................... 25 ° maximum
Detent Torque ...............................................................................................................................................................1.3 N-cm (2.0 oz.-in) nominal
Environmental Characteristics1
Vibration ............................................................................................................................................................................................................... 8 G
Contact Resistance ............................................................................................................................................................ 30 milliohms maximum
Contact Bounce ............................................................................................................................................................ 0.1 milliseconds maximum
Shock ................................................................................................................................................................................................................. 20 G
Contact Resistance ............................................................................................................................................................ 30 milliohms maximum
Contact Bounce ............................................................................................................................................................ 0.1 milliseconds maximum
Rotational Life @ Rated Power ............................................................................................................................................................. 50,000 cycles
Contact Resistance .......................................................................................................................................................... 100 milliohms maximum
Moisture Resistance (MIL-STD-202, Method 103, Condition B)
Contact Resistance ............................................................................................................................................................ 30 milliohms maximum
Insulation Resistance (After 24 Hours @ Room Temperature - 500 VDC) ........................................................................ 100 megohms minimum
1At room ambient: +25 °C nominal and 50 % relative humidity nominal, except as noted.
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
56 - Sealed 1/2 ” (12.5 mm) Panel Control w/Rotary Switch
Product Dimensions
Recommended PCB Layout
16.51 ± 0.25
(.650 ± .010)
FMS
7.62
(.300)
8.89 ± 0.18
(.350 ± .007)
.64
"L"
( .025)
12.5
(.492)
6.35
(.250)
6.25
(.246)
11.00
DIA.
(.432)
7.00
(.275)
0.74
(.029)
5.08
(.200)
1.32
(.052)
TYP.
2.54
(.100)
CL OF POT
0.30
(.0118)
5.08 ± 0.30
(.200 ± .012)
6.35 ± 0.25
(.250 ± .010)
2.54
(.100)
2.54
(.100)
.66 ± .05
3X
(.026 ± .002)
7.62 ± 0.30
(.300 ± .012)
2.54
( .100)TERMINAL SPACING
1.27
(.050)
DIA.
4 PLCS.
1.02
(.040)
DIA.
6 PLCS.
(Double Module Front and Rear Bracket Shown)
Suggested Panel Layouts
6.20
(.244)
PACKAGE DIMENSIONS W/PCB MOUNTING BRACKET
16.51 ± 0.25
(.650 ± .010)
"L"±
12.5
(.492)
.64
( .025)
11.00
DIA.
(.432)
7.00
(.275)
0.74
(.029)
0.91 ± .051
(.036 ± .002)
6.35 ± 0.25
(.250 ± .010)
6.25
(.246)
6.35
(.250)
2.77
(.109)
2.20
(.087)
BUSHING DIAMETER
0.80
( .031)
BUSHING DIAMETER
0.80
( .031)
The Model 56 can be used with either
of the two panel layouts shown.
1.32 ± 0.25
(.052 ± .010)
2X
5.08 ± 0.30
(.200 ± .012)
6.35 ± 0.25
(.250 ± .010)
.41 ± .05
( .016 ± .002)
5.08
(.200)
5.08
(.200)
7.62 ± 0.30
(.300 ± .012)
2X
2.54
(.100)
Electrical Schematic
CCW
3
1
CW
2
Switch Configuration
ANTI-ROTATION LUG (Style "A", 90 ° CW Shown)
0.80 ± 0.30
(.031 ± .012)
0.41
(.016)
1’ CCW
5.70
(.224)
2’
3’ CW
1.52
(.060)
SPDT
132 ° ± 5 ° CCW END
Terminal Layout
1’
1
SHAFT FLAT ORIENTATION
2’
.25
FOR TOLERANCES SHOWN: .XX = ± (.010)
.XXX = ± .13
(.005)
SHAFT DIMENSIONS ± .80
(1/32)
DIMENSIONS:
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
MM
(INCHES)
3’
3
2
56 - Sealed 1/2 ” (12.5 mm) Panel Control w/Rotary Switch
Shaft/Bushing Styles
9.53
(.375)
How To Order
56
6.35
9.53
SHAFT
BUSHING
(.250)
(.375)
D
-
C
28
-
B
15
/
R81
L
RoHS IDENTIFIER
Code Description
L
Compliant
ANTI-ROTATION LUG /
BRACKET OPTION
Code Description
AR Lug 90 °CW
A
No AR Lug or Bracket
D
Front Bracket
L
Front and Rear Bracket
N
A Style Bushing
STD. LENGTH ‘L’
.750
(19.05)
.875
(22.23)
SWITCH OPTION
Code Description
R80 SPDT CW
R81 SPDT CCW
NO. OF SECTIONS
Code Description
A
Single plus Switch
RESISTANCE CODES
Code Value in Ohms
10 1K
13 5K
15 10K
18 50K
20 100K
22 250K
23 500K
0.79 ± 0.25
OPT.
(.031 ± .010)
0.79 ± 0.10
OPT.
(.031 ± .004)
1/4-32UNEF-2A
3.18
6.35
SHAFT
BUSHING
(.125)
(.250)
MAX. FLAT LENGTH
1.52 ± 0.25
OPT.
(.060 ± .010)
BUSHING DESIGNATOR
Code Description
3/8 ” D x 3/8 ” L Threaded
A
1/4 ” D x 1/4 ” L Threaded
C
MODEL
Code Description
56 PC Terminals w/Rotary
Switch
C Style Bushing
STD. LENGTH ‘L’
.750
(19.05)
.875
(22.23)
9.53
(.375)
A
1.194 ± 0.10
OPT.
(.047 ± .004)
3/8-32UNEF-2A
6.35
(.250)
A
1.60 ± 0.25
OPT.
(.063 ± .010)
ELEMENT TAPER
TYPE/TOLERANCE
Code Description
Linear CP ±20 %
B
Linear CP ±10 %
E
CW Audio CP ±20 %
D
CW Audio CP ±10 %
S
15.88
(.625)
SHAFT LENGTH DESIGNATOR
Code Description
24 3/4 “ FMS Long
28 7/8 ” FMS Long
5.49 ± 0.10
OPT.
(.216 ± .005)
3/8-32UNEF-2A
6.35
9.53
SHAFT
BUSHING
(.250)
(.375)
A Style Bushing Flatted Shaft
Boldface features are Bourns
standard options. All others are
available with higher minimum
order quantities.
Code
B
C
E
SHAFT STYLE
Description
1/4 ” D Slotted End
1/4 ” D Flatted End
1/8 ” D Slotted End
AVAILABLE ONLY WITH
BUSHING
Code
A
A
C
STD. LENGTH ‘L’
.750
(19.05)
.875
(22.23)
DIMENSIONS:
MM
(INCHES)
Asia-Pacific: Tel: +886-2 2562-4117 • Fax: +886-2 2562-4116
Europe: Tel: +41-41 768 5555 • Fax: +41-41 768 5510
The Americas: Tel: +1-951 781-5500 • Fax: +1-951 781-5700
www.bourns.com
08/11
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
Similar pages