3851 BOURNS | Alldatasheet
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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 Initial Electrical Characteristics1 3851 3852/3856 Conductive Plastic Element Cermet Element Standard Resistance Range (whichever is greater) Dielectric Withstanding Voltage (MIL-STD-202, Method 301) Power Rating (Voltage Limited By Power Dissipation or 350 VAC, Whichever Is Less) Environmental Characteristics1 Temperature Coefficient Over Moisture Resistance (MIL-STD-202, Method 103, Condition B) 1 Electrical 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 Characteristics1 Stop Strength 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. 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) 1 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 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. 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 13 2 13 2 SUGGESTED BOARD LAYOUT STANDARD PRINTED CIRCUIT TERMINAL A, B & H BUSHINGS C & E 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. 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 .2512.19 (.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 (.250 ± .03) .79 (.031) 3.18 ± .03 (.125 ± .003) DIA. STD.STD. 6.35 ± .76 (.25 ± .03) 19.05 (.75) DIA. DIA.12.19 (.480) STD. STD. .79 ± .25 (.031 ± .010) 2.36 (.094) 50 ° ± 10 ° 2.67 ± .381 (.105 ± .015) DIMENSIONS: MM (INCHES) 1 3 CCW POTENTIOMETER
LOCKWASHER H-37-1 NUT H-38-1 LOCKNUT H-38-3 LOCKNUT H-38-4 LOCKWASHER H-37-2 NUT H-38-2 6.6 (.26) 12.07 ± 0.25 (.475 ± .01) 0.64 ± 0.05 (.025 ± .002) 9.53 +0/-0.38 (.375 +0/-.015) 11 +0/-0.43 (.433 +0/-.017) 2.36 ± 0.25 (.093 ± .01) 30 ° ± 5 ° TYP. 1/4-32 UNEF 4.57 ± 0.05 (.180 ± .002) 7.92 (.312) 15 ° ± 1 ° 0.64 (.025) 1.02 (.040) 3.96 (.156) 7.75 (.305) 1/4-32 NEF-20 30 ° ± 5 ° 8.51 ± 0.05 (.335 ± .002) 1.14 ± 0.38 (.045 ± .015) 12.7 (.5) 18 ° ± 2 ° 1.02 (.040) 1.91 (.075) 4.83 (.19) 3/8-32 NEF-2B MIN. 30 ° ± 5 ° TYP. 14.66 +0/-0.43 (.577 +0/-.017) 2.36 ± 0.25 (.093 ± .01) 30 ° ± 5 ° 3/8-32 NEF-2B 9.58 ± 0.36 (.377 ± .014) 12.52 ± 0.36 (.493 ± .014) 0.56 ± 0.05 (.022 ± .002) DIMENSIONS: MM (INCHES) 3851/3852/3856 – 3/4 ˝ Diameter Panel Control 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. Date Code Description YY = LAST TWO DIGITS OF YEAR MANUFACTURED WW = WEEK NUMBER M = COUNTRY OF MANUFACTURE (MEXICO) YYWWM
3851/3852/3856 – 3/4 ˝ Diameter Panel Control How To Order 3 852 A - 2 8 2 - 103 A L ELEMENT APPLICABLE T APER/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
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-T ur n C.P . 3852 3/4 ” (19.05 mm) D Single-T ur n Cermet 3856 3/4 ” (19.05 mm) D 3-3/4-T ur n Cermet R ESIST ANCE C ODE/V ALUE ( IN OHMS) M odel 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. AVA ILABLE ONL Y 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. 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. 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
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