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
Contact Resistance Variation .................................................................±1 %............................................................±3 % of total resistance or 3 ohms
(whichever is greater)
Dielectric Withstanding Voltage (MIL-STD-202, Method 301)
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
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
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
Moisture Resistance (MIL-STD-202, Method 103, Condition B)
Total Resistance Shift.........................................................................±10 % maximum ........................................±2 % maximum
IP Rating .................................................................................................IP 40 ............................................................IP 40
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.
*RoHS Directive 2002/95/EC Jan 27 2003 including Annex
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
Product Dimensions
3851A/3852A
9.53
(.38)
6.35
±
.76
(.25
±
.03)
.38
(.015)
12.7, 22.23
STD.
(1/2, 7/8)
3/8-32 UNEF
.25
45
°
X
(.010)
CHAMFER
6.35+.03/-.05
DIA.
(.250+.001/-.002)
SHAFT SLOT
1.19
.047 WIDE X
1.60+.38/.00
DEEP
(.063+.015/-.000)
6.35
±
.76
(.25
±
.03)
3851B/3852B
12.7
(.50)
.38
(.015)
15.88
STD.
(5/8)
3/8-32 UNEF
.25
45
°
X
(.010)
CHAMFER
6.35+.03/-.05
DIA.
(.250+.001/-.002)
SHAFT SLOT
1.19 WIDE X
(.047)
1.60+.38/-.00
DEEP
(.063+.015/-.000)
Terminal Configuration
SOLDER LUG TERMINAL
6.35
2.79
(.25) TYP.
(.110)
3 PLCS.
12.7
(.50)
EACH TERMINAL LUG
2
3
2 PLCS.
1
WILL ACCOMMODATE
.81
THREE (.032) DIAMETER
14.02
±
.25
(.812 DIA. AWG
(.552
±
.010)
STRANDED) WIRES.
STANDARD
PRINTED CIRCUIT TERMINAL
1.02
6.35
TYP.
TYP.
(.040)
(.25)
19.05
(.75)
DIA.
19.05
(.75)
DIA.
12.19
DIA.
(.480)
12.19
DIA.
(.48)
16.00
5.49
OPTIONAL FLAT
(.63)
(.216)
1.52
28.58
LONG OR
FRONT BUSHING FOR SHAFTS UNDER
(.06)
(1-1/8)
15.88
±
.38
(.625
±
.015)
1
2
3
6.35
(.25)
3851C/3852C
6.35
(.25)
9.53, 22.23
STD.
(3/8, 7/8)
1/4-32 UNEF
.25
45
°
X (.010)
CHAMFER
2.36
(.094)
3851E/3852E
9.53
(.38)
6.35
±
.76
(.25
±
.03)
.38
(.015)
12.7
STD.
(1/2)
1/4-32 UNEF
.25
45
°
X (.010)
CHAMFER
SUGGESTED BOARD LAYOUT
6.35
6.35
(.25)
(.25)
1.40
DIA.
(.055)
6.35
±
.76
(.25
±
.03)
.38
(.015)
19.05
(.75)
DIA.
19.05
(.75)
DIA.
3.18
±
0.25
DIA.
(.125
±
.001)
3.18
±
.025
DIA.
(.125
±
.001)
SHAFT SLOT
.79 WIDE X .76 DEEP
(.031)
(.03)
3851/3852/3856
A, B & H BUSHINGS
9.53
(.375)
9.53
(.375)
12.19
DIA.
(.480)
SHAFT SLOT
.79 WIDE X .76 DEEP
(.03)
(.031)
12.19
DIA.
(.480)
.25
OPTIONAL FLAT
LONG OR
(.010)
1.52
15.88
FRONT BUSHING FOR SHAFTS UNDER
(.06)
(5/8)
10.31
DIA.
(.406)
3.18
DIA.
(.125)
3.18
6.73
DIA. (.125)DIA.
(.265)
Shaft End Detail
3850 Family
3856A
9.53
(.38)
6.35
±
.76
(.25
±
.03)
.38
(.015)
12.7
(.50)
6.35+.03/-.05
DIA.
(.250+.001/-.002)
3/8-32 UNEF
1.19
(.047)
3856H
9.53
(.38)
6.35
±
.76
(.25
±
.03)
.38
(.015)
12.7
(.50)
6.35+.03/-.05
DIA.
(.250
±
.03)
3/8-32 UNEF.
.79
(.031)
SHAFT SLOT
ALIGNMENT
AT CCW
FLAT
ALIGNMENT
AT CCW
50
° ±
10
°
50
° ±
10
°
19.05
(.75)
DIA.
12.19
DIA.
(.480)
1.60+3.81/-.000
(.063+.015/-.000)
DIA.
22.23
STD.
(7/8)
19.05
(.75)
DIA.
12.19
DIA.
(.480)
.79
±
.25
(.031
±
.010)
22.23
STD.
(7/8)
3.18
±
.03
(.125
±
.003)
DIA.
.25
45
°
X (.010)
CHAMFER
.25
45
°
X (.010)
CHAMFER
TOLERANCES EXCEPT AS NOTED:
.127
.38
DECIMALS: .XXX
±
.XX
±
(.015)
(.005),
FRACTIONS:
±
1/64
ANGLE:
±
3 %
1
CCW
3
DIMENSIONS ARE:
MM
(INCHES)
2
POTENTIOMETER
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
How To Order
3852
A
-
28
2
-
103
A
L
12
16
16
20
SHAFT TYPE
(FMS) & DIAMETER
3/8 ” (9.53 mm) L X 1/8 ” (3.18 mm) D
1/2 ” (12.7 mm) L x 1/4 ” (6.35 mm) D
1/2 ” (12.7 mm) L x 1/8 ” (3.18 mm) D
5/8 ” (15.88 mm) L X 1/4 ” (6.35 mm) D
28 7/8 ” (22.20 mm) L X 1/4 ” (6.35 mm) D
28 7/8 ” (22.20 mm) L X 1/8 ” (3.18 mm) D
Consult factory for lengths not shown.
AVAILABLE ONLY IN
MODELS
BUSHINGS
3851, 3852
C
3851, 3852
A
3851, 3852
C, E
3851, 3852
A, B
3851, 3852
A, B
3856
A
3851, 3852
C, E
3856
H
A
B
C
E
H
BUSHING
Plain 3/8 ” (9.53 mm) D x 3/8 ” (9.53 mm) L
Locking 3/8 ” (9.53 mm) D x 1/2 ” (12.7 mm) L
Plain 1/4 ” (6.35 mm) D x 1/4 ” (6.35 mm) L
Locking 1/4 ” (6.35 mm) D x 1/2 ” (12.7 mm) L
Plain 3/8 ” (9.53 mm) D x 3/8 ” (9.53 mm) L
APPLICABLE MODELS
3851, 3852, 3856
3851, 3852
3851, 3852
3851, 3852
3856 (3.18 mm D Shaft)
RESISTANCE
CODE/VALUE
(IN OHMS)
Model 3851
(102)
1K
(252)
2.5 K
(502)
5K
(103)
10 K
(253)
25 K
(503)
50 K
(104)
100 K
(254)
250 K
(504)
500 K
(105)
1M
Models 3852/3856
(101)
100
(251)
250
(501)
500
(102)
1K
(252)
2.5 K
(502)
5K
(103)
10 K
(253)
25 K
(503)
50 K
(104)
100 K
(254)
250 K
(504)
500 K
(105)
1M
RoHS IDENTIFIER
L
Compliant
MODEL
3851 3/4 ” (19.05 mm) D Single-Turn C.P.
3852 3/4 ” (19.05 mm) D Single-Turn Cermet
3856 3/4 ” (19.05 mm) D 3-3/4-Turn Cermet
TERMINAL STYLE AND
SHAFT TYPE
1
2
3
5
6
7
Solder Lugs, Plain End
Solder Lugs, Slotted End
Solder Lugs, Flatted Shaft
PC Pins, Plain End
PC Pins, Slotted End
PC Pins, Flatted Shaft
Boldface features are Bourns standard
options. All others are available with higher
minimum order quantities.
A
B
C
D
E
F
G
H
ELEMENT
TAPER/TOLERANCE
Linear ±10 %
Linear ±20 %
Audio CW ±10 %
Audio CW ±20 %
Linear ±10 %
Audio CCW ±10 %
Audio CCW ±20 %
Linear ±5 %
APPLICABLE MODELS
3852, 3856
3851
3852, 3856
3851
3851
3852, 3856
3851
3852, 3856
REV. 04/10/09
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
