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
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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
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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
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Stop Strength ..............................................................................................................................................................................................56.5 N-cm (5 lb.-in.)
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....................................................................................................Manufacturer’s 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.
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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
