Features
nꢀ Single-turnꢀ(3851ꢀandꢀ3852)
nꢀ Linearꢀandꢀaudioꢀtapers
nꢀ 3-3/4-turnꢀ(3856)
nꢀ Wideꢀresistanceꢀrange
nꢀ Minimalꢀdepthꢀpackage
nꢀ Goodꢀresolution
ꢀ ꢀꢀ3851/3852/3856ꢀ-ꢀ3/4ꢀ”ꢀDiameterꢀPanelꢀControlꢀ
1
Initial Electrical Characteristics
3851
3852/3856
Cermet Element
Conductive Plastic 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.....................................................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 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.
1
At room ambient: +25 °C nominal and 50 %
relative humidity nominal, except as noted.
*RoHSꢀDirectiveꢀ2002/95/ECꢀJan.ꢀ27,ꢀ2003ꢀincludingꢀannexꢀandꢀRoHSꢀRecastꢀ2011/65/EUꢀJuneꢀ8,ꢀ2011.ꢀ
Specificationsꢀareꢀsubjectꢀtoꢀchangeꢀwithoutꢀnotice.ꢀTheꢀdeviceꢀcharacteristicsꢀandꢀparametersꢀinꢀthisꢀdataꢀsheetꢀ
canꢀandꢀdoꢀvaryꢀinꢀdifferentꢀapplicationsꢀandꢀactualꢀdeviceꢀperformanceꢀmayꢀvaryꢀoverꢀtime.
Usersꢀshouldꢀverifyꢀactualꢀdeviceꢀperformanceꢀinꢀtheirꢀspecificꢀapplications.
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