PANEL CONTROLS
SC1005
Bourns Manufacturers Representatives
Corporate Distributor Product Managers
Americas Sales Team
Asia Sales Team
Europe Sales Team
January, 2010
Model 3862 New Contact Spring Design
As a follow up to the previous update issued in October 2009, Sensors and Controls Product Line is
pleased to announce the qualifi cation and fi nal release of our Model 3862 panel control with a new
contact spring design.
As previously announced, our carbon contact supplier had been purchased by another company,
and had subsequently ceased production of the carbon contact thereby prompting Bourns to
redesign the contact to a metal spring.
Production is now underway with back orders being fi lled on a priority basis. For those customers
requiring qualifi cation data and/or samples for evaluation, please contact your local Bourns Sales
Representative.
Should you have any questions regarding this notice, please feel free to contact me or any of our
Field Application Engineers.
Western US and Canada ............. Paul Snow ...............+1-801-985-8500 .......paul.snow@bourns.com
Eastern US and Canada ............... David Johnson .......+1-951-781-5445 .......david.johnson@bourns.com
UK, Ireland and Scandinavia ....... Carl Queen .............+353-214-515-225 .....carl.queen@bourns.com
Central and Southern Europe ..... Helmut Deuter .......+49-8104-646820 ......helmut.deuter@bourns.com
France ............................................ Andreas Fessler .......+41-41-7685-551 .......andreas.fessler@bourns.com
Asia, Australia and India .............. Jeff Wu ...................+886-2-2562-4117....jeff.wu@bourns.com
Best regards,
Emill Melliz
Product Line Manager
Bourns® Sensors & Controls Product Line
Resistive Products Division
E-mail: emill.melliz@bourns.com
Features
■ Small diameter
■ Wide resistance range
■ Good resolution
■ Linear tapers
■ Cermet element
3862 - 1/2 ” Diameter Single-Turn Panel Control
*RoHS Directive 2002/95/EC Jan 27 2003 including Annex
Specifi cations are subject to change without notice.
Customers should verify actual device performance in their specifi c applications.
Initial Electrical Characteristics1
Standard Resistance Range .................................................................................................................................................100 ohms to 1 megohm
Total Resistance Tolerance ............................................................................................................................................................... (A Taper) ±10 %
(H Taper) ±5%
Independent Linearity ........................................................................................................................................................................................ ±5 %
Absolute Minimum Resistance ...................................................................................................................................................... 2 ohms maximum
Effective Electrical Angle ..........................................................................................................................................................................260 ° ±10 °
Contact Resistance Variation ........................................................................................................................±3 % or 6 ohms (whichever is greater)
Dielectric Withstanding Voltage (MIL-STD-202, Method 301)
Sea Level ................................................................................................................................................................................ 750 VAC minimum
70,000 Feet ............................................................................................................................................................................. 350 VAC minimum
Insulation Resistance (500 VDC) ...................................................................................................................................... 1,000 megohms minimum
Power Rating (Voltage Limited by Power Dissipation or 350 VAC, Whichever is Less)
+70 °C......................................................................................................................................................................................................... 1 watt
+125 °C....................................................................................................................................................................................................... 0 watt
Theoretical Resolution ................................................................................................................................................................... Essentially infi nite
Environmental Characteristics1
Operating Temperature Range ...................................................................................................................................................... -40 °C to +125 °C
Storage Temperature Range ......................................................................................................................................................... -65 °C to +125 °C
Temperature Coeffi cient Over Storage Temperature Range ................................................................................................................ ±150 ppm/°C
Vibration ............................................................................................................................................................................................................ 20 G
Total Resistance Shift ................................................................................................................................................................. ±2 % maximum
Voltage Ratio Shift ...................................................................................................................................................................... ±6 % maximum
Shock ................................................................................................................................................................................................................. 50 G
Total Resistance Shift ................................................................................................................................................................. ±2 % maximum
Voltage Ratio Shift ...................................................................................................................................................................... ±6 % maximum
Load Life ..................................................................................................................................................................................................1,000 hours
Total Resistance Shift ................................................................................................................................................................. ±3 % maximum
Rotational Life (C & N Bushing) No Load .............................................................................................................................................50,000 cycles
Total Resistance Shift ................................................................................................................................................................. ±5 % maximum
Contact Resistance Variation ...................................................................................................................................................................... ±3 %
Moisture Resistance (MIL-STD-202, Method 106, Condition B)
Total Resistance Shift ................................................................................................................................................................. ±2 % maximum
Insulation Resistance (500 VDC) ................................................................................................................................... 100 megohms minimum
Salt Spray ...................................................................................................................................................MIL-STD-202, Method 101, Condition A
IP Rating .............................................................................................................................................................................................................IP 40
Mechanical Characteristics1
Stop Strength ............................................................................................................................................................... 33 N-cm (3 lb.-in.) maximum
Mechanical Angle ....................................................................................................................................................................................... 295 ° ±3 °
Torque
Starting and Running .......................................................................................................................................... 3.53 N-cm (5 oz.-in.) maximum
Mounting (Torque on Bushing)................................................................................................................... 1.7-2.0 N-m (15-18 lb.-in.) maximum
Shaft Locking Torque with Locking Bushings ................................................................................................................. 14.12 N-cm (20 oz.-in.)
Weight (Single Section)............................................................................................................................................................... 25 grams maximum
(Each Additional Section) .....................................................................................................................................................................................
Terminals ................................................................................................................................................................... Printed circuit pins or J-Hooks
Soldering Condition .................................................... Recommended hand soldering using Sn85/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 fl ux.
Part can be wave soldered at 260 °C (500 °F) for 5 seconds, no wash process with no clean fl ux.
Marking .................................................................Manufacturer’s trademark, wiring diagram, date code, resistance, manufacturer’s part number
Ganging ............................................................................................................................................................................................ 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 COMPLIANT
VERSIONS
AVAILABLE
Specifi cations are subject to change without notice.
Customers should verify actual device performance in their specifi c applications.
3862 - 1/2 ” Diameter Single-Turn Panel Control
Product Dimensions
DIMENSIONS: MM
(INCHES)
DIA.
45 °
DIA. 2 PLCS.
Shaft End Detail
3862
45 ° ± 15 °
C OF LUG
L
32-1/2 ° ± 10 °
FLAT ORIENTATION
@ CCW END
SLOTS ARE
NOT ORIENTED
3862C/N
L
OPTIONAL FLAT LONG OR
FROM BUSHING FOR SHAFTS UNDER
3862E/T
STD.
2 PLCS.
L
DIA.
45 ° ± 5 ° X
POSITION OF SLOTS VARIABLE
-32 UNEF - 2A
L =
DIA.
FOR "T" BUSHING,
DIA.
6.22
(.245)
6.22
(.245)
2.44 ± .13
(.096 + .005/ - .000)
6.73
(.265)
2 PLCS.
2.31
(.091)
2 PLCS.
.25
(.010)
2 PLCS.
6.22
(.245)
12.07 ± .76
(.475 ± .030)
11.51 ± .41
(.453 ± .016)
12.7 ± .41
(.500 ± .016)
6.25
(1/4)
12.7
(.500)
9.53
(.375) FOR "E" BUSHING
15.88
(5/8)
.89 ± .25
(.035 ± .010)
.79 ± .25
(.031 ± .010)
.79
(.031)
.41
(.016)
3.18 ± .03
(.125 ± .001) 12.07 ± .76
(.475 ± .030)
11.51 ± .41
(.453 ± .016)
12.7 ± .41
(.500 ± .016)
-32 UNEF - 2A
6.25
(1/4)
L = FOR "C" BUSHING, 9.65
(.380)
6.35
(.250) FOR "N" BUSHING
45 ° ± 5 ° X .41
(.016)
.79 ± .25
(.031 ± .010)
.79
(.031)
DIA.
3.18 ± .03
(.125 ± .001)
STD.
9.53, 22.23
(3/8, 7/8)
2 PLCS.
.89 ± .25
(.035 ± .010)
2.38
(.094)
6.35
(.250)
3.3
(.13) 16.88
(5/8)
TYP.
2.54
(.100)
5.08
(.200)
3.04
(.120)
5.08
(.200)
PANEL LAYOUTPCB LAYOUT
PC PIN TERMINAL
12.06 ± .762
(.475 ± .03)
.723
(.0285)
5.08
(0.20)
2.54
(0.10)
3.04
(.12)
5.08
(.20)
2
1
3
J-HOOK TERMINAL
6.53
(.250)
MAX.
2.286
(.09)
TYP.
5.08
(0.20)
2.54
(0.10)
4.953
(.195)
8.89
(.35)
2
1
3
REF ONLY
.762
(.03)
TYP.
13
CCW
POTENTIOMETER
2
Specifi cations are subject to change without notice.
Customers should verify actual device performance in their specifi c applications.
How to Order 3862 Series Panel Controls
REV. 12/09
3862 C - 28 2 - 102 A L
MODEL
3862
12
16
20
28
1/2 ” (12.7 mm) D Single-Turn Cermet
BUSHING
C
E
N
T
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 1/4 ” (6.35 mm) D x 3/8 ” (9.53 mm) L
Locking 1/4 ” (6.35 mm) D x 3/8 ” (9.53 mm) L
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 End
ELEMENT
TAPER/TOLERANCE
A
H
Linear ±10 %
Linear ±5 %
RoHS IDENTIFIER
Compliant
Non-Compliant
L
Blank
RESISTANCE
CODE/VALUE
(IN OHMS)
(101)
(251)
(501)
(102)
(252)
(502)
(103)
(253)
(503)
(104)
(254)
(504)
(105)
100
250
500
1K
2.5K
5K
10K
25K
50K
100K
250K
500K
1M
3/8 ” (9.53 mm) L X 1/8 ” (3.18 mm) D
1/2 ” (12.7 mm) L x 1/8 ” (3.18 mm) D
5/8 ” (15.88 mm) L x 1/8 ” (3.18 mm) D
7/8 ” (22.20 mm) L X 1/8 ” (3.18 mm) D
Consult factory for lengths not shown.
Boldface features are Bourns standard
options. All others are available with higher
minimum order quantities.
SHAFT TYPE
(FMS) & DIAMETER
C
C
C, E, N, T
C, E, N, T
BUSHINGS
