Features n Single-turn (3851 and 3852) n 3-3/4-turn (3856) n Linear and audio tapers n Wide resistance range n Minimal depth package n 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 Effective Electrical Angle ..................................(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 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 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 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 ................................................... 20,000 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 Electrical specifications tested at 250 RPM, at room ambient: +25 C nominal. *RoHS Directive 2015/863, Mar 31, 2015 and Annex. WARNING Specifications are subject to change without notice. Users should verify actual device performance in their specific Cancer and Reproductive Harm applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the www.P65Warnings.ca.gov last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. 3851/3852/3856 3/4 Diameter Panel Control 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 flux. Part can be wave soldered at 260 C (500 F) for 5 seconds, no wash process with no clean flux. 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 locking bushing versions are shipped with one additional locking nut (Bushing A&H: H-37-2 & H-38-2 Bushing B: H-37-2, H-38-2 & H-38-4 Bushing C: H-37-1 & H-38-1 Bushing E: H-37-1, H-38-1 & H-38-3) 1 Electrical specifications tested at 250 RPM, at room ambient: +25 C nominal. Specifications are subject to change without notice. Users 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 www.bourns.com/docs/legal/disclaimer.pdf.