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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

Initial Electrical Characteristics

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

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 ................................................... 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

Electrical

3851

Conductive Plastic Element

3852/3856

Cermet Element

specifications tested at 250 RPM, at room ambient: +25 °C nominal.

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.

3851/3852/3856 – 3/4 ˝ Diameter Panel Control

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;

locking bushing versions are shipped with one additional locking nut

(Bushing A&H: H-37-2 & H-38-2; Bushing B: H-37-2, H-38-2 & H-38-4; Bushing C: H-37-1 & H-38-1;

Bushing E: H-37-1, H-38-1 & H-38-3)

Electrical

specifications tested at 250 RPM, at room ambient: +25 °C nominal.

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.

3851/3852/3856 – 3/4 ˝ Diameter Panel Control

Product Dimensions

9.53

(.38)

.38

(.015)

12.7, 22.23

STD.

(1/2, 7/8)

3/8-32 UNEF

.25

(.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)

12.7

(.50)

.38

(.015)

15.88

STD.

(5/8)

3/8-32 UNEF

.25

(.010)

CHAMFER

6.35+.03/-.05

DIA.

(.250+.001/-.002)

SHAFT SLOT

1.19 WIDE X

(.047)

1.60+.38/-.00

(.063+.015/-.000)DEEP

6.35

.76

(.25

.03)

19.05

(.75)

DIA.

12.19

DIA.

(.480)

19.05

(.75)

DIA.

12.19

DIA.

(.48)

SOLDER LUG TERMINAL

6.35

2.79

(.25)

TYP.

(.110)

3 PLCS.

12.7

(.50)

EACH TERMINAL LUG

2 PLCS.

WILL ACCOMMODATE

.72

THREE

(.028)

DIAMETER

14.02

.25

(.724 DIA. AWG

(.552

.010)

STRANDED) WIRES.

STANDARD

PRINTED CIRCUIT TERMINAL

1.02

6.35

TYP.

(.040)

(.25)

15.88

.38

(.625

.015)

16.00

5.49

OPTIONAL FLAT

(.63)

(.216)

1.52

28.58

LONG OR

FRONT BUSHING FOR SHAFTS UNDER

(.06)

(1-1/8)

6.35

(.25)

6.35

(.25)

9.53, 22.23

STD.

(3/8, 7/8)

.38

(.015)

2.36

(.094)

1/4-32 UNEF

.25

X (.010)

CHAMFER

6.35

.76

(.25

.03)

9.53

(.38)

.38

(.015)

12.7

STD.

(1/2)

1/4-32 UNEF

.25

X (.010)

CHAMFER

6.35

.76

(.25

.03)

SUGGESTED BOARD LAYOUT

6.35

(.25)

1.40

DIA.

(.055)

19.05

(.75)

DIA.

12.19

DIA.

(.480)

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)

.25

OPTIONAL FLAT

LONG OR

(.010)

1.52

15.88

FRONT BUSHING FOR SHAFTS UNDER

(.06)

(5/8)

SHAFT SLOT

.79 WIDE X .76 DEEP

(.03)

(.031)

12.19

DIA.

(.480)

A, B & H BUSHINGS

9.53

(.375)

C & E BUSHINGS

9.53

(.375)

9.91

DIA.

(.390)

3.18

DIA.

(.125)

3.18

6.73

DIA.

(.125)DIA.

(.265)

9.53

(.38)

6.35

.76

(.25

.03)

12.7

(.50)

.38

(.015)

6.35+.03/-.05

DIA.

(.250+.001/-.002)

3/8-32 UNEF

1.19

(.047)

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

° ±

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

X (.010)

CHAMFER

2.67

.381

(.105

.015)

ANTI-ROTATION LUG

PROJECTS 1/16 INCH

ABOVE MOUNTING FACE.

TOLERANCES EXCEPT AS NOTED:

.127

.XX

.38

DECIMALS: .XXX

(.005),

(.015)

FRACTIONS:

1/64

ANGLE:

3 %

.25

X (.010)

CHAMFER

DIMENSIONS:

(INCHES)

CCW

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.

POTENTIOMETER

3851/3852/3856 – 3/4 ˝ Diameter Panel Control

Hardware

LOCKWASHER H-37-1

6.6

(.26)

NUT H-38-1

9.53 +0/-0.38

(.375 +0/-.015)

2.36 ± 0.25

(.093 ± .01)

LOCKNUT H-38-3

4.57 ± 0.05

(.180 ± .002)

7.75

(.305)

11 +0/-0.43

(.433 +0/-.017)

NUT H-38-2

2.36 ± 0.25

(.093 ± .01)

30 ° ± 5 °

1.02

(.040)

30 ° ± 5 °

TYP.

0.64

(.025)

15 ° ± 1 °

1/4-32 UNEF

1/4-32

NEF-20

12.07 ± 0.25

(.475 ± .01)

LOCKWASHER H-37-2

9.58 ± 0.36

(.377 ± .014)

0.64 ± 0.05

(.025 ± .002)

7.92

(.312)

3/8-32 NEF-2B

3.96

(.156)

12.52 ± 0.36

(.493 ± .014)

0.56 ± 0.05

(.022 ± .002)

14.66 +0/-0.43

(.577 +0/-.017)

30 ° ± 5 °

Date Code Description

YYWWM

M = COUNTRY OF MANUFACTURE

(MEXICO)

WW = WEEK NUMBER

YY = LAST TWO DIGITS OF YEAR

MANUFACTURED

DIMENSIONS:

(INCHES)

LOCKNUT H-38-4

8.51 ± 0.05

(.335 ± .002)

1.91

MIN.

(.075)

18 ° ± 2 °

3/8-32

NEF-2B

1.02

(.040)

12.7

(.5)

1.14 ± 0.38

(.045 ± .015)

30 ° ± 5 ° TYP.

4.83

(.19)

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.

3851/3852/3856 – 3/4 ˝ Diameter Panel Control

How To Order

3852

103

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

7/8 ” (22.20 mm) L X 1/4 ” (6.35 mm) D

7/8 ” (22.20 mm) L X 1/8 ” (3.18 mm) D

AVAILABLE ONLY IN

MODELS

3851, 3852

3856

3851, 3852

3856

BUSHINGS

C, E

A, B

C, E

Consult factory for lengths not shown.

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

3856 (3.18 mm D Shaft)

RESISTANCE

CODE/VALUE

(IN OHMS)

Model 3851

(102)

(252)

2.5 K

(502)

(103)

10 K

(253)

25 K

(503)

50 K

(104)

100 K

(254)

250 K

(504)

500 K

(105)

Models 3852/3856

(101)

100

(251)

250

(501)

500

(102)

(252)

2.5 K

(502)

(103)

10 K

(253)

25 K

(503)

50 K

(104)

100 K

(254)

250 K

(504)

500 K

(105)

ELEMENT

TAPER/TOLERANCE

Linear ±10 %

Linear ±20 %

Audio CW ±10 %

Audio CW ±20 %

Linear ±10 %

Audio CCW ±10 %

Audio CCW ±20 %

Linear ±5 %

RoHS IDENTIFIER

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

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.

APPLICABLE

MODELS

3852, 3856

3851

3852, 3856

3851

3852, 3856

3851

3852, 3856

Asia-Pacific:

Tel: +886-2 2562-4117 • Email: asiacus@bourns.com

EMEA:

Tel: +36 88 885 877 • Email: eurocus@bourns.com

The Americas:

Tel: +1-951 781-5500 • Email: americus@bourns.com

www.bourns.com

REV. 10/20

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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