MF-R030-0-A0-99 - BOURNS - Product.Network

Features

n Single-turn (3851 and 3852)

n 3-3/4-turn (3856)

n Linear and audio tapers

n Wide resistance range

n Minimal depth package

n Good resolution

3851/3852/3856 - 3/4 ” Diameter Panel Control

*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.

Initial Electrical Characteristics1

3851 3852/3856

Conductive Plastic Element Cermet 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

Eective 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 innite .............................................. Essentially innite

Environmental Characteristics1

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 Coecient 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

1 At room ambient: +25 °C nominal and 50 % relative humidity nominal, except as noted.

WARNING Cancer and Reproductive Harm - www.P65Warnings.ca.gov

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 Characteristics1

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 ux.

Part can be wave soldered at 260 °C (500 °F) for 5 seconds, no wash process with no clean ux.

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.

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)

3/8-32 UNEF

19.05

(.75)

DIA.

3/8-32 UNEF

1/4-32 UNEF 1/4-32 UNEF

3/8-32 UNEF 3/8-32 UNEF.

6.35

(.25) 2.79

(.110)

3 PLCS.

14.02 ± .25

(.552 ± .010)

SOLDER LUG TERMINAL

SUGGESTED BOARD LAYOUT

STANDARD

PRINTED CIRCUIT TERMINAL

A, B & H BUSHINGS

SHAFT SLOT

ALIGNMENT

AT CCW

FLAT

ALIGNMENT

AT CCW

50 ° ± 10 °

6.35 ± .76

(.25 ± .03) .38

(.015)

19.05

(.75)

DIA.

12.7, 22.23

(1/2, 7/8)

45 ° X (.010)

CHAMFER

.25

DIA.

6.35+.03/-.05

(.250+.001/-.002)

SHAFT SLOT

1.19 WIDE X

.047

1.60+.38/.00

(.063+.015/-.000)

12.19

(.480) DIA.

DEEP

OPTIONAL FLAT

LONG OR FRONT BUSHING FOR SHAFTS UNDER

5.49

(.216)

16.00

(.63)

1.52

(.06)

28.58

(1-1/8)

OPTIONAL FLAT LONG OR

FRONT BUSHING FOR SHAFTS UNDER

.25

(.010)

1.52

(.06)

15.88

(5/8)

12.7

(.50)

6.35 ± .76

(.25 ± .03) .38

(.015)

15.88

(5/8)

45 ° X (.010)

CHAMFER

.25

DIA.

6.35+.03/-.05

(.250+.001/-.002)

DIA.

12.19

(.48)

DEEP

SHAFT SLOT

1.19 WIDE X

(.047)

1.60+.38/-.00

(.063+.015/-.000)

TYP.

12.7

(.50)

2 PLCS. EACH TERMINAL LUG

WILL ACCOMMODATE

THREE .72 DIAMETER

(.724 DIA. AWG

STRANDED) WIRES.

(.028)

6.35

(.25) TYP.

15.88 ± .38

(.625 ± .015)

1.02

(.040)

TYP.

6.35

(.25)

6.35

(.25)

6.35

(.25)

1.40

(.055)

DIA.

9.53

(.375)

9.91

(.390) DIA. 3.18

(.125) DIA.

9.53

(.375)

6.73

(.265) DIA. 3.18

(.125)DIA.

TOLERANCES EXCEPT AS NOTED:

DECIMALS: .XXX ± .127 .XX ± .38

FRACTIONS: ± 1/64

ANGLE: ± 3 %

ANTI-ROTATION LUG

PROJECTS 1/16 INCH

ABOVE MOUNTING FACE.

(.005), (.015)

6.35 ± .76

(.25 ± .03)

6.35

(.25)

9.53, 22.23

(3/8, 7/8)

.38

(.015)

45 ° X (.010)

CHAMFER

.25 45 ° X (.010)

CHAMFER

.25

3.18 ± 0.25

(.125 ± .001)

DIA.

SHAFT SLOT

.79 WIDE X .76 DEEP

(.031) (.03)

9.53

(.38)

12.7

(1/2)

.38

(.015)

19.05

(.75)

DIA.

12.19

(.480)

3.18 ± .025

(.125 ± .001)

DIA.

SHAFT SLOT

.79 WIDE X .76 DEEP

(.03) (.031)

6.35 ± .76

(.25 ± .03)

.38

(.015)

9.53

(.38)

12.7

(.50)

DIA.

6.35+.03/-.05

(.250+.001/-.002)

1.19

(.047)

45 ° X (.010)

CHAMFER

.25

12.19

(.480) DIA.

1.60+3.81/-.000

(.063+.015/-.000)

DIA.

22.23

(7/8) STD.

45 ° X (.010)

CHAMFER

.25

22.23

(7/8) STD.

12.19

(.480) DIA.

19.05

(.75)

DIA.

19.05

(.75)

DIA.

6.35 ± .76

(.25 ± .03)

12.7

(.50)

9.53

(.38)

.38

(.015) DIA.

6.35+.03/-.05

(.250 ± .03)

.79

(.031)

3.18 ± .03

(.125 ± .003)

DIA.

STD.

6.35 ± .76

(.25 ± .03)

19.05

(.75)

DIA.

12.19

(.480)

STD. STD.

.79 ± .25

(.031 ± .010)

2.36

(.094)

50 ° ± 10 °

2.67 ± .381

(.105 ± .015)

DIMENSIONS: MM

(INCHES)

CCW

POTENTIOMETER

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

REV. 03/19

3852 A - 28 2 - 103 A L

ELEMENT APPLICABLE

TAPER/TOLERANCE MODELS

A Linear ±10 % 3852, 3856

B Linear ±20 % 3851

C Audio CW ±10 % 3852, 3856

D Audio CW ±20 % 3851

E Linear ±10 % 3851

F Audio CCW ±10 % 3852, 3856

G Audio CCW ±20 % 3851

H Linear ±5 % 3852, 3856

TERMINAL STYLE AND

SHAFT TYPE

1 Solder Lugs, Plain End

2 Solder Lugs, Slotted End

3 Solder Lugs, Flatted Shaft

5 PC Pins, Plain End

6 PC Pins, Slotted End

7 PC Pins, Flatted Shaft

BUSHING APPLICABLE MODELS

A Plain 3/8 ” (9.53 mm) D x 3/8 ” (9.53 mm) L 3851, 3852, 3856

B Locking 3/8 ” (9.53 mm) D x 1/2 ” (12.7 mm) L 3851, 3852

C Plain 1/4 ” (6.35 mm) D x 1/4 ” (6.35 mm) L 3851, 3852

E Locking 1/4 ” (6.35 mm) D x 1/2 ” (12.7 mm) L 3851, 3852

H Plain 3/8 ” (9.53 mm) D x 3/8 ” (9.53 mm) L 3856 (3.18 mm D Shaft)

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

RESISTANCE

CODE/VALUE

(IN OHMS)

Model 3851

(102) 1 K

(252) 2.5 K

(502) 5 K

(103) 10 K

(253) 25 K

(503) 50 K

(104) 100 K

(254) 250 K

(504) 500 K

(105) 1 M

Models 3852/3856

(101) 100

(251) 250

(501) 500

(102) 1 K

(252) 2.5 K

(502) 5 K

(103) 10 K

(253) 25 K

(503) 50 K

(104) 100 K

(254) 250 K

(504) 500 K

(105) 1 M

RoHS IDENTIFIER

CompliantL

Boldface features are Bourns standard options.

All others are available with higher minimum order

quantities.

AVAILABLE ONLY IN

SHAFT TYPE

(FMS) & DIAMETER MODELS BUSHINGS

12 3/8 ” (9.53 mm) L X 1/8 ” (3.18 mm) D 3851, 3852 C

16 1/2 ” (12.7 mm) L x 1/4 ” (6.35 mm) D 3851, 3852 A

16 1/2 ” (12.7 mm) L x 1/8 ” (3.18 mm) D 3851, 3852 C, E

20 5/8 ” (15.88 mm) L X 1/4 ” (6.35 mm) D 3851, 3852 A, B

28 7/8 ” (22.20 mm) L X 1/4 ” (6.35 mm) D 3851, 3852 A, B

3856 A

3851, 3852 C, E

28 7/8 ” (22.20 mm) L X 1/8 ” (3.18 mm) D 3856 H

Consult factory for lengths not shown.

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afliates (collectively, “Bourns”).

Unless otherwise expressly indicated in writing, Bourns® products and data sheets relating thereto are subject to change

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statements regarding the suitability of products for certain types of applications are based on Bourns’ knowledge of typical

requirements in generic applications. The characteristics and parameters of a Bourns® product in a user application may vary

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C1753 05/17/18R