Bourns® Panel Controls

1 Features Single-turn (3851 and 3852) 3-3/4-turn (3856) linear and audio tapers Wide resistance range Minimal depth package Good resolution 3851/3852/3856 - 3/4 Diameter Panel Control *RoHS Directive 2015/863, Mar 31, 2015 and are subject to change without should verify actual device performance in their specific products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and Electrical Characteristics138513852/3856 Conductive Plastic ElementCermet ElementStandard Resistance RangeEffective Electrical AngleLinear Tapers (A, B, E, and H) ..1 K to 1 100 ohms to 1 megohmAudio Tapers (C, D, F, and G)..1 K to 1 1 K ohms to 1 megohmTotal Resistance 10 % or 20 %.

2 5 % or 10 %Independent 10 %.. (A & H tapers) 5 %Absolute Minimum ohms 2 ohms ( linear tapers) 250 5 .. ( linear tapers) 250 5 (Audio tapers) 225 5 .. (Audio tapers) 225 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 900 VAC minimum70,000 Feet ..350 VAC 350 VAC minimumInsulation Resistance (500 VDC) ..1,000 megohms 1,000 megohms minimumPower Rating (Voltage Limited By Power Dissipation or 350 VAC, Whichever Is Less)+70 C ..( linear tapers) 1 ( linear tapers) 2 watts(Audio tapers) watt .. (Audio tapers) 1 watt+125 C ..0 watt+150 C .. 0 wattTheoretical ResolutionEssentially InfiniteEssentially Characteristics1 Operating Temperature Range.

3 -1 C to +125 C .. -1 C to +125 CStorage Temperature RangeTemperature Coefficient Over-65 C to +125 C .. -65 C to +150 C Storage Temperature 1,000 ppm/ 150 ppm/ CVibration .. 20 GTotal Resistance 2 % 2 % maximumVoltage Ratio 5 % 6 % maximumShock .. 100 GTotal Resistance 2 % 2 % maximumVoltage Ratio 5 % 6 % maximumLoad Life .. 1,000 hours ..1,000 hoursTotal Resistance 10 % 3 % maximumRotational Life (No Load) .. 100,000 cycles ..20,000 cyclesTotal Resistance 15 % TRS maximum .. 5 % or 5 ohms TRS whichever is greaterContact Resistance 3 %.. 3 % Moisture Resistance (MIL-STD-202, Method 103, Condition B)Total Resistance 10 % maximum .. 2 % maximumIP IP 40.

4 IP 401 At room ambient: +25 C nominal and 50 % relative humidity nominal, except as Cancer and Reproductive Harm - 3/4 Diameter Panel Control Mechanical Characteristics1 Stop Strength3851 & 3852 .. N-cm (5 ) Continuous turnMechanical 5 / 3856 1350 50 Torque (Starting and Running) ..A & B bushings to N-cm ( to )C & E bushings to N-cm ( to )3856 to N-cm ( to )Mounting (Torque on Bushing).. N-m (15-18 ) maximumWeight (Single Section) .. 30 grams maximumTerminals .. Printed circuit terminals or solder lugsSoldering Condition ..Recommended hand soldering using Sn95/Ag5 no clean solder, wire .. Manufacturer s trademark, wiring diagram, resistance, date code, and part numberMaximum temperature 399 C (750 F) for 3 seconds.

5 No wash process to be used with no clean can be wave soldered at 260 C (500 F) for 5 seconds, no wash process with no clean (Multiple Section Potentiometers).. 1 cup One lockwasher and one mounting nut is shipped with each potentiometer, except where noted in the part number. 1 At room ambient: +25 C nominal and 50 % relative humidity nominal, except as are subject to change without should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at - 3/4 Diameter Panel Control Product Dimensions3851A/3852A3851C/3852C3856A385 6 HShaft End Detail3850 Family3851E/3852E3851/3852/38563851B/385 2 BTerminal (.)

6 38)3/8-32 (.75) UNEF1/4-32 UNEF1/4-32 UNEF3/8-32 UNEF3/8-32 (.25) (.110)3 .25(.552 .010)SOLDER LUG TERMINAL132132 SUGGESTED BOARD LAYOUTSTANDARDPRINTED CIRCUIT TERMINALA, B & H BUSHINGSSHAFT SLOTALIGNMENTAT CCWFLATALIGNMENTAT CCW50 10 .76(.25 .03).38(.015) (.75) DIA. , (1/2, 7/8) 45 X (.010) +.03 (.250+.001 ) SHAFT +.38/.00(.063+.015 ) (.480) FLATLONG ORFRONT BUSHING FOR SHAFTS (.216) (.63) (.06) (1-1/8)OPTIONAL FLATLONG ORFRONT BUSHING FOR SHAFTS (.010) (.06) (5/8) (.50) .76(.25 .03).38(.015) (5/8) 45 X (.010) +.03 (.250+.001 ) (.48) DEEPSHAFT WIDE X(.047) +.38 (.063+.015 ) (.50)2 TERMINAL LUGWILL ACCOMMODATETHREE .72 DIAMETER(.724 DIA. AWGSTRANDED) WIRES.(.028) (.

7 25) .38(.625 .015) (.040) (.25) (.25) (.25) (.055) (.375) (.390) (.125) (.375) (.265) (.125) EXCEPT AS NOTED:DECIMALS: .XXX .127 .XX .38 FRACTIONS: 1/64 ANGLE: 3 %ANTI-ROTATION LUGPROJECTS 1/16 INCHABOVE MOUNTING FACE.(.005),(.015) .76(.25 .03) (.25) , (3/8, 7/8) .38(.015)45 X (.010) X (.010) (.125 .001) WIDE X .76 DEEP(.031)(.03) (.38) (1/2) .38(.015) (.75)DIA. (.480) .025(.125 .001) WIDE X .76 DEEP(.03)(.031) .76(.25 .03).38(.015) (.38) (.50) +.03 (.250+.001 ) (.047)45 X (.010) (.480) + (.063+.015 ) (7/8) X (.010) (7/8) (.480) (.75) (.75) .76(.25 .03) (.50) (.38).38(.015) +.03 (.250 .03) .79(.031) .03(.125 .003).

8 76(.25 .03) (.75)DIA. (.480) .25(.031 .010) (.094)50 10 .381(.105 .015) DIMENSIONS: MM(INCHES)13 CCWPOTENTIOMETER2 Specifications are subject to change without should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at - 3/4 Diameter Panel Control How To OrderREV. 10/193852 A - 28 2 - 103 A L ELEMENT APPLICABLE TAPER/TOLERANCE MODELSA linear 10 % 3852, 3856 BLinear 20 % 3851 CAudio CW 10 % 3852, 3856 DAudio CW 20 % 3851 ELinear 10 % 3851 FAudio CCW 10 % 3852, 3856 GAudio CCW 20 % 3851 HLinear 5 % 3852, 3856 TERMINAL STYLE AND SHAFT TYPE 1 Solder Lugs, Plain End 2 Solder Lugs, Slotted End 3 Solder Lugs, Flatted Shaft 5PC Pins, Plain End 6PC Pins, Slotted End 7PC Pins.

9 Flatted ShaftBUSHING APPLICABLE MODELSA Plain 3/8 ( mm) D x 3/8 ( mm) L 3851, 3852, 3856 BLocking 3/8 ( mm) D x 1/2 ( mm) L 3851, 3852 CPlain 1/4 ( mm) D x 1/4 ( mm) L 3851, 3852 ELocking 1/4 ( mm) D x 1/2 ( mm) L 3851, 3852 HPlain 3/8 ( mm) D x 3/8 ( mm) L 3856 ( mm D Shaft)MODEL3851 3/4 ( mm) D Single-T urn 3/4 ( mm) D Single-T urn Cermet3856 3/4 ( mm) D 3-3/4-T urn Cermet RESISTANCE CODE/VALUE (IN OHMS) Model 3851(102) 1 K(252) 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) K(502) 5 K(103) 10 K(253) 25 K(503) 50 K(104) 100 K(254) 250 K(504) 500 K(105)

10 1 MRoHS IDENTIFIERC ompliantLBoldface features are Bourns standard options. All others are available with higher minimum order ONLY IN SHAFT TYPE (FMS) & DIAMETER MODELS BUSHINGS12 3/8 ( mm) L X 1/8 ( mm) D 3851, 3852 C16 1/2 ( mm) L x 1/4 ( mm) D 3851, 3852 A16 1/2 ( mm) L x 1/8 ( mm) D 3851, 3852 C, E20 5/8 ( mm) L X 1/4 ( mm) D 3851, 3852 A, B28 7/8 ( mm) L X 1/4 ( mm) D3851, 3852 A, B3856 A3851, 3852 C, E28 7/8 ( mm) L X 1/8 ( mm) D3856 HConsult factory for lengths not are subject to change without should verify actual device performance in their specific applications.