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
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
Temperature Coefficient Over
-65 °C to +125 °C ................................................-65 °C to +150 °C
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
At room ambient: +25 °C nominal and 50 % relative humidity nominal, except as noted.
WARNING Cancer and Reproductive Harm - www.P65Warnings.ca.gov
*RoHS Directive 2015/863, Mar 31, 2015 and Annex.
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.
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