*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. 3851/3852/3856 - 3/4 diameter panel control initial electrical characteristics 1 3851 3852/3856 conductive plastic element cermet element standard resistance range linear tapers (a, b, e, and h) ............................................................1 k to 1 megohm...................... ...................100 ohms to 1 megohm audio tapers (c, d, f, and g) .............................................................1 k to 1 megohm...................... ...................1 k ohms to 1 megohm total resistance tolerance .....................................................................10 % or 20 %.................. ........................5 % or 10 % independent linearity .............................................................................10 %........................ ..................................(a & h tapers) 5 % absolute minimum resistance ...............................................................2 ohms maximum....................... ................. 2 ohms maximum effective electrical angle ........................................................................250 5 ................... ..................................250 5 contact resistance variation .................................................................1 %.............................. ..............................3 % of total resistance or 3 ohms (whichever is greater) dielectric withstanding voltage (mil-std-202, method 301) sea level............................................................................................900 vac minimum........... ............................900 vac minimum 70,000 feet ........................................................................................350 vac minimum............. ..........................350 vac minimum insulation resistance (500 vdc) ............................................................1,000 megohms minimum............... ............1,000 megohms minimum power rating (voltage limited by power dissipation or 350 vac, whichever is less) +70 c ...............................................................................................(linear tapers) 1 watt... ................................(linear tapers) 2 watts (audio tapers) 0.5 watt (audio tapers) 1 watt +125 c ..............................................................................................0 watt +150 c ........................................................................................................................ ...........................................0 watt theoretical resolution ............................................................................essentially infinite ......... ...............................essentially infinite environmental characteristics 1 operating temperature range ...............................................................-1 c to +125 c..................... .....................-1 c to +125 c storage temperature range...................................................................-65 c to +125 c.................. ......................-65 c to +150 c temperature coefficient over storage temperature range...................1,000 ppm/c......................................... ...150 ppm/c vibration..................................................................................................20 g................ .............................................20 g total resistance shift.........................................................................2 % maximum .................... .......................2 % maximum voltage ratio shift..............................................................................5 % maximum .................. .........................6 % maximum shock......................................................................................................100 g............... ............................................100 g total resistance shift.........................................................................2 % maximum .................... .......................2 % maximum voltage ratio shift..............................................................................5 % maximum .................. .........................6 % maximum load life.................................................................................................1,000 hours .......... .......................................1,000 hours total resistance shift.........................................................................10 % maximum ................... ......................3 % maximum rotational life (no load) ........................................................................100,000 cycles ................ ............................50,000 cycles total resistance shift.........................................................................15 % trs maximum .............. ..................5 % or 5 ohms trs whichever is greater contact resistance variation .............................................................3 %.................................. ..........................3 % moisture resistance (mil-std-202, method 103, condition b) total resistance shift.........................................................................10 % maximum .................. ......................2 % maximum ip rating .................................................................................................ip 40 ................ ............................................ip 40 mechanical characteristics 1 stop strength .................................................................................................................. ............................................................................56.5 n-cm (5 lb.-in.) mechanical angle ............................................................................................................... .....................................................280 5 / 3856 C 1350 50 torque (starting and running) .................................................................................................. ............a & b bushings 0.35 to 4.23 n-cm (0.05 to 6.0 oz.-in.) c & e bushings 0.21 to 4.23 n-cm (0.3 to 6.0 oz.-in.) 3856 C 0.11 to 2.12 n-cm (0.15 to 3.0 oz.-in.) mounting (torque on bushing) ................................................................................................... ...................................1.7-2.0 n-m (15-18 lb.-in.) maximum weight (single section) ........................................................................................................ ........................................................................30 grams maximum terminals ...................................................................................................................... ..................................................printed circuit terminals or solder lugs 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....................................................................................................manufacturers trade mark, wiring diagram, resistance, date code, and part number ganging (multiple section potentiometers) ...................................................................................... ................................................................1 cup maximum hardware ............................................one lockwasher and one mounting nut is shipped with each potentiometer, exc ept where noted in the part number. 1 at room ambient: +25 c nominal and 50 % relative humidity nominal, except as noted. features single-turn (3851 and 3852) linear and audio tapers 3-3/4-turn (3856) wide resistance range minimal depth package good resolution *rohs compliant
specifications are subject to change without notice. customers should verify actual device performance in their specific applications. 3851/3852/3856 - 3/4 diameter panel control dimensions are: mm (inches) 9.53 (.38) 3/8-32 unef 3851a/3852a 3851b/3852b 19.05 (.75) dia. 3/8-32 unef 1/4-32 unef 3851c/3852c 1/4-32 unef 3851e/3852e 3/8-32 unef 3856a 3/8-32 unef. 3856h 6.35 (.25) 2.79 (.110) 3 plcs. 14.02 .25 (.552 .010) terminal configuration solder lug terminal 13 2 13 2 suggested board layout standard printed circuit terminal 3851/3852/3856 a, b & h bushings shaft end detail 3850 family shaft slot alignment at ccw flat alignment at ccw 50 10 6.35 .76 (.25 .03) .38 (.015) 19.05 (.75) dia. 12.7, 22.23 (1/2, 7/8) 45 x (.010) chamfer .25 dia. 6.35+.03/-.05 (.250+.001/-.002) shaft slot 1.19 wide x .047 1.60+.38/.00 (.063+.015/-.000) 12.19 (.480) dia. deep optional flat long or front bushing for shafts under 5.49 (.216) 16.00 (.63) 1.52 (.06) 28.58 (1-1/8) optional flat long or front bushing for shafts under .25 (.010) 1.52 (.06) 15.88 (5/8) 12.7 (.50) 6.35 .76 (.25 .03) .38 (.015) 15.88 (5/8) 45 x (.010) chamfer .25 dia. 6.35+.03/-.05 (.250+.001/-.002) dia. 12.19 (.48) deep shaft slot 1.19 wide x (.047) 1.60+.38/-.00 (.063+.015/-.000) typ. 12.7 (.50) 2 plcs. each terminal lug will accommodate three .81 diameter (.812 dia. awg stranded) wires. (.032) 6.35 (.25) typ. 15.88 .38 (.625 .015) 1.02 (.040) typ. 6.35 (.25) 6.35 (.25) 6.35 (.25) 1.40 (.055) dia. 9.53 (.375) 10.31 (.406) dia. 3.18 (.125) dia. 9.53 (.375) 6.73 (.265) dia. 3.18 (.125) dia. tolerances except as noted: decimals: .xxx .127 .xx .38 fractions: 1/64 angle: 3 % (.005), (.015) 6.35 .76 (.25 .03) 6.35 (.25) 9.53, 22.23 (3/8, 7/8) .38 (.015) 45 x (.010) chamfer .25 45 x (.010) chamfer .25 3.18 0.25 (.125 .001) dia. shaft slot .79 wide x .76 deep (.031) (.03) 9.53 (.38) 12.7 (1/2) .38 (.015) 19.05 (.75) dia. dia. 12.19 (.480) 3.18 .025 (.125 .001) dia. shaft slot .79 wide x .76 deep (.03) (.031) 6.35 .76 (.25 .03) .38 (.015) 9.53 (.38) 12.7 (.50) dia. 6.35+.03/-.05 (.250+.001/-.002) 1.19 (.047) 45 x (.010) chamfer .25 12.19 (.480) dia. 1.60+3.81/-.000 (.063+.015/-.000) dia. 22.23 (7/8) std. 45 x (.010) chamfer .25 22.23 (7/8) std. 12.19 (.480) dia. 19.05 (.75) dia. 19.05 (.75) dia. 6.35 .76 (.25 .03) 12.7 (.50) 9.53 (.38) .38 (.015) dia. 6.35+.03/-.05 (.250 .03) .79 (.031) 3.18 .03 (.125 .003) dia. std. std. 6.35 .76 (.25 .03) 19.05 (.75) dia. dia. 12.19 (.480) std. std. .79 .25 (.031 .010) 2.36 (.094) 50 10 product dimensions 1 3 ccw potentiometer 2
specifications are subject to change without notice. customers should verify actual device performance in their specific applications. shaft type available only in (fms) & diameter models bushings 12 3/8 ? (9.53 mm) l x 1/8 ? (3.18 mm) d 3851, 3852 c 16 1/2 (12.7 mm) l x 1/4 (6.35 mm) d 3851, 3852 a 16 1/2 ? (12.7 mm) l x 1/8 ? (3.18 mm) d 3851, 3852 c, e 20 5/8 ? (15.88 mm) l x 1/4 ? (6.35 mm) d 3851, 3852 a, b 28 7/8 ? (22.20 mm) l x 1/4 ? (6.35 mm) d 3851, 3852 a, b 3856 a 3851, 3852 c, e 28 7/8 (22.20 mm) l x 1/8 (3.18 mm) d 3856 h bushing applicable models a plain 3/8 ? (9.53 mm) d x 3/8 ? (9.53 mm) l 3851, 3852, 3856 b locking 3/8 (9.53 mm) d x 1/2 (12.7 mm) l 3851, 3852 c plain 1/4 ? (6.35 mm) d x 1/4 ? (6.35 mm) l 3851, 3852 e locking 1/4 (6.35 mm) d x 1/2 (12.7 mm) l 3851, 3852 h plain 3/8 (9.53 mm) d x 3/8 (9.53 mm) l 3856 (3.18 mm d shaft) consult factory for lengths not shown. model 3851 3/4 (19.05 mm) d single-turn c.p. 3852 3/4 ? (19.05 mm) d single-turn cermet 3856 3/4 (19.05 mm) d 3-3/4-turn cermet terminal style and shaft type 1 solder lugs, plain end 2 solder lugs, slotted end 3 solder lugs, flatted shaft 5 pc pins, plain end 6 pc pins, slotted end 7 pc pins, flatted shaft element applicable models taper/tolerance a linear 10 % 3852, 3856 b linear 20 % 3851 c audio cw 10 % 3852, 3856 d audio cw 20 % 3851 e linear 10 % 3851 f audio ccw 10 % 3852, 3856 g audio ccw 20 % 3851 h linear 5 % 3852, 3856 resistance code/value (in ohms) model 3851 (102) 1 k (252) 2.5 k (502) 5 k (103) 10 k (253) 25 k (503) 50 k (104) 100 k (254) 250 k (504) 500 k (105) 1 m models 3852/3856 (101) 100 (251) 250 (501) 500 (102) 1 k (252) 2.5 k (502) 5 k (103) 10 k (253) 25 k (503) 50 k (104) 100 k (254) 250 k (504) 500 k (105) 1 m how to order 3851/3852/3856 - 3/4 diameter panel control boldface features are bourns standard options. all others are available with higher minimum order quantities. rev. 04/10/09 3852 a - 28 2 - 103 a l rohs identifier l compliant
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