features rohs compliant* cw or ccw rotary switch linear and audio tapers pc board and bushing mount splash seal metal bushing and shaft applications test and measurement equipment avionics controls communications equipment medical laboratory equipment 56 - sealed 1/2 ?(12.5 mm) panel control w/rotary switch *rohs directive 2002/95/ec jan 27, 2003 including annex. speci cations are subject to change without notice. customers should verify actual device performance in their speci c applications. electrical characteristics 1 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 in? nite environmental characteristics 1 operating temperature range ................................................................................................... ................................................................... +1 c to +125 c storage temperature range ..................................................................................................... ...................................................................-55 c to +125 c temperature coef? cient 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/ag 5 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 ? ux. part can be wave soldered at 260 c (500 f) for 5 seconds, no wash process with no clean ? ux. marking .................................................................................................................. manufacturer? s trademark, part number, resistance value and date code. ganging (multiple section potentiometers) .................................................................................... i nquire for availability, minimum order quantity and price. hardware ...........................................................................................................one lockwas her and one mounting nut is shipped with each potentiometer. 1 at room ambient: +25 c nominal and 50 % relative humidity nominal, except as noted. *rohs compliant
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 characteristics 1 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 1 at room ambient: +25 c nominal and 50 % relative humidity nominal, except as noted. speci cations are subject to change without notice. customers should verify actual device performance in their speci c applications.
shaft flat orientation package dimensions w/pcb mounting bracket 1 3 cw 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) 6.20 (.244) bushing diameter 0.80 ( .031) 2.77 (.109) 6.35 (.250) the model 56 can be used with either of the two panel layouts shown. (double module front and rear bracket shown) 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) 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) 16.51 0.25 (.650 .010) .64 ( .025) "l" 5.08 0.30 (.200 .012) 0.91 .051 (.036 .002) 6.35 0.25 (.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) 0.80 0.30 (.031 .012) 1.52 (.060) .25 .13 .80 ( .100) terminal spacing 2.54 132 5 ccw end 1.32 (.052) fms c l of pot 2.54 (.100) typ. 1.27 (.050) dia. 4 plcs. 1.02 (.040) dia. 6 plcs. 6.35 (.250) 7.62 (.300) 5.08 (.200) 2 2 spdt 1 3 ccw cw 3 1 1 2 3 speci? cations are subject to change without notice. customers should verify actual device performance in their speci? c applications. 56 - sealed 1/2 ?(12.5 mm) panel control w/rotary switch product dimensions dimensions: mm (inches) recommended pcb layout suggested panel layouts electrical schematic switch con guration terminal layout
opt. 3/8-32unef-2a 9.53 (.375) 1.60 0.25 (.063 .010) opt. 1.194 0.10 (.047 .004) shaft 6.35 (.250) bushing 9.53 (.375) speci cations are subject to change without notice. customers should verify actual device performance in their speci c applications. 56 - sealed 1/2 ?(12.5 mm) panel control w/rotary switch std. length ?l? .750 (19.05) .875 (22.23) a style bushing c style bushing a style bushing - flatted shaft dimensions: mm (inches) how to order 08/11 56 a a d - c 28 - b 15 / r81 l model code 56 description pc terminals w/rotary switch bushing designator code a c description 3/8 ? d x 3/8 ? l threaded 1/4 ? d x 1/4 ? l threaded switch option code r80 r81 description spdt cw spdt ccw shaft length designator code 24 28 description 3/4 ? fms long 7/8 ? fms long resistance codes code 10 13 15 18 20 22 23 value in ohms 1k 5k 10k 50k 100k 250k 500k element taper type/tolerance code b e d s description linear cp 20 % linear cp 10 % cw audio cp 20 % cw audio cp 10 % anti-rotation lug / bracket option code a d l n description ar lug 90 cw no ar lug or bracket front bracket front and rear bracket no. of sections code a description single plus switch rohs identifier description compliant code l boldface features are bourns standard options. all others are available with higher minimum order quantities. available only with shaft style bushing code description code b 1/4 ? d slotted end a c 1/4 ? d flatted end a e 1/8 ? d slotted end c shaft/bushing styles 1/4-32unef-2a 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) 3/8-32unef-2a 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) asia-paci? c: 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 std. length ?l? .750 (19.05) .875 (22.23) std. length ?l? .750 (19.05) .875 (22.23)
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