Features Single-turn (3851 and 3852) Linear and audio tapers 3-3/4-turn (3856) Wide resistance range Minimal depth package Good resolution 3851/3852/3856 - 3/4 Diameter Panel Control 1 Initial Electrical Characteristics 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 E ective 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 in nite .............................................. Essentially in nite 1 Environmental Characteristics 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 Coe cient 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 1 Mechanical Characteristics Stop Strength 3851 & 3852 .................................................................................................................................................................. 56.5 N-cm (5 lb.-in.) 3856 ..................................................................................................................................................................................... Continuous turn Mechanical Angle .............................................................................................................................................280 5 / 3856 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 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 ux. Part can be wave soldered at 260 C (500 F) for 5 seconds, no wash process with no clean ux. Marking ......................................................................... Manufacturers trademark, 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, except where noted in the part number. *RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011. 1 At room ambient: +25 C nominal and 50 % Speci cations are subject to change without notice. relative humidity nominal, except as noted. The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time. Users should verify actual device performance in their speci c applications. *RoHS COMPLIANT3851/3852/3856 - 3/4 Diameter Panel Control Product Dimensions 3851A/3852A 3851B/3852B Terminal Configuration 15.88 12.7, 22.23 STD. 12.7 STD. 9.53 (5/8) SOLDER LUG TERMINAL (1/2, 7/8) (.50) (.38) 6.35 6.35 .76 3/8-32 UNEF TYP. 2.79 6.35 .76 3/8-32 UNEF (.25) .38 (.25 .03) .25 (.110) (.25 .03) .38 .25 45 X (.015) 45 X (.010) 3 PLCS. (.015) (.010) CHAMFER CHAMFER 12.7 (.50) EACH TERMINAL LUG 19.05 2 19.05 2 PLCS.13 6.35+.03/-.05 WILL ACCOMMODATE 6.35+.03/-.05 (.75) DIA. (.75) DIA. (.250+.001/-.002) .81 (.250+.001/-.002) DIA. THREE DIAMETER DIA. (.032) 14.02 .25 (.812 DIA. AWG SHAFT SLOT (.552 .010) SHAFT SLOT STRANDED) WIRES. 1.19 WIDE X 12.19 1.19 12.19 WIDE X DIA. (.047) DIA047 (.48) (.480) 1.60+.38/-.00 STANDARD 1.60+.38/.00 DEEP DEEP PRINTED CIRCUIT TERMINAL (.063+.015/-.000) (.063+.015/-.000) 5.49 16.00 6.35 1.02 OPTIONAL FLAT TYP. TYP. (.216) (.63) (.25) (.040) 1.52 28.58 LONG OR FRONT BUSHING FOR SHAFTS UNDER (.06) (1-1/8) 15.88 .38 6.35 (.625 .015) 2 13 (.25) 3851C/3852C 3851E/3852E 12.7 9.53, 22.23 STD. STD. 9.53 (1/2) 6.35 (3/8, 7/8) (.38) (.25) 1/4-32 UNEF 1/4-32 UNEF 6.35 .76 6.35 .76 SUGGESTED BOARD LAYOUT .25 (.25 .03) .38 .25 6.35 .38 6.35 (.25 .03) 45 X 45 X (.010) (.015) (.010) (.25) (.25) (.015) CHAMFER CHAMFER 2.36 1.40 19.05 (.094) DIA. 19.05 (.055) (.75) (.75) DIA. DIA. 3851/3852/3856 3.18 0.25 3.18 .025 DIA. DIA. (.125 .001) (.125 .001) A, B & H BUSHINGS 12.19 12.19 DIA. 9.53 9.53 SHAFT SLOT DIA. (.480) SHAFT SLOT (.480) .79 .76 (.375) (.375) WIDE X DEEP .79 .76 WIDE X DEEP (.03) (.031) (.03) (.031) .25 OPTIONAL FLAT LONG OR (.010) 1.52 15.88 FRONT BUSHING FOR SHAFTS UNDER 6.73 3.18 (.06) (5/8) 9.91 3.18 DIA. DIA. DIA. DIA. (.125) (.265) (.390) (.125) Shaft End Detail 3850 Family SHAFT SLOT FLAT 3856A 3856H 12.7 12.7 ALIGNMENT ALIGNMENT (.50) 9.53 (.50) AT CCW AT CCW 9.53 (.38) (.38) .38 .38 6.35+.03/-.05 6.35+.03/-.05 DIA. 6.35 .76 (.015) DIA. 50 10 6.35 .76 (.250+.001/-.002) 50 10 (.015) (.250 .03) (.25 .03) (.25 .03) 3/8-32 UNEF. 3/8-32 UNEF .79 1.19 (.031) 2.67 .381 (.047) 19.05 19.05 (.105 .015) (.75) (.75) ANTI-ROTATION LUG DIA. DIA. PROJECTS 1/16 INCH ABOVE MOUNTING FACE. 12.19 12.19 DIA. 3.18 .03 DIA25 (.480) (.480) 45 X (.125 .003) TOLERANCES EXCEPT AS NOTED: (.010) DIA127 .38 CHAMFER .79 .25 DECIMALS: .XXX .XX 1.60+3.81/-.000 (.005), (.015) (.031 .010) .25 45 X (.063+.015/-.000) FRACTIONS: 1/64 (.010) 22.23 DIA. STD. ANGLE: 3 % CHAMFER (7/8) 22.23 1 3 STD. (7/8) MM CCW DIMENSIONS: (INCHES) 2 POTENTIOMETER Speci cations are subject to change without notice. The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time. Users should verify actual device performance in their speci c applications.