6638S-1-503

PL IA NT CO M *R oH S Features 7/8 ˝ (22 mm) diameter single-turn conductive plastic Bushing mount Excellent resolution High rotational life – ball bearing shaft support Non-standard features and specifications available 6638 - Precision Potentiometer Electrical Characteristics1 Product Dimensions Standard Resistance Range....................................................................................1 K to 100 K ohms Total Resistance Tolerance .........................................................................................................±10 % Independent Linearity ...................................................................................................................±1 % Effective Electrical Angle .......................................................................................................340 ° ±3 ° End Voltage .................................................................................................................0.5 % maximum Output Smoothness ....................................................................................................0.1 % maximum Dielectric Withstanding Voltage (MIL-STD-202, Method 301) Sea Level .............................................................................................................750 VAC minimum Power Rating (Voltage Limited By Power Dissipation or 300 VAC, Whichever is Less) +70 °C......................................................................................................................................1 watt +125 °C....................................................................................................................................0 watt Insulation Resistance (500 VDC)..................................................................1,000 megohms minimum Resolution..................................................................................................................Essentially infinite Environmental Characteristics1 Operating Temperature Range...................................................................................+1 °C to +125 °C Storage Temperature Range.....................................................................................-65 °C to +125 °C Temperature Coefficient Over Storage Temperature Range ...........................±500 ppm/°C maximum Vibration .........................................................................................................................................15 G Wiper Bounce ...........................................................................................0.1 millisecond maximum Total Resistance Shift ..............................................................................................±5 % maximum Voltage Ratio Shift ................................................................................................±0.5 % maximum Shock .............................................................................................................................................50 G Wiper Bounce ...........................................................................................0.1 millisecond maximum Total Resistance Shift ..............................................................................................±5 % maximum Voltage Ratio Shift ................................................................................................±0.5 % maximum Load Life .................................................................................................................1,000 hours, 1 watt Total Resistance Shift ............................................................................................±10 % maximum Rotational Life (No Load) .........................................................................20,000,000 shaft revolutions Total Resistance Shift ............................................................................................±10 % maximum Moisture Resistance (MIL-STD-202, Method 106) Total Resistance Shift ............................................................................................±10 % maximum IP Rating ........................................................................................................................................IP 40 6638 7/8 ˝ (22 mm) DIA. At room ambient: +25 °C nominal and 50 % relative humidity, except as noted. 1 CW 3 1.57 13.64 ± .38 (.062) (.537 ± .015) 22.23 (7/8) DIA. 1 45 ° ± 5 ° 7.14 + .00/- .05 DIA. (.281+.000/-.002) 1/4"-32 UNEF-THD 3.170 + .000/-.008 DIA. (.1248+.0000/.0003) .25 45 ° ± 5° X CHAMFER (.010) 9.53 (3/8) 3.18 (1/8) 22.23 (7/8) .38 (.015) SHAFT SLOT .81 .81 WIDE X (.032) DEEP (.032) TOLERANCES: EXCEPT WHERE NOTED .51 .127 DECIMALS: .XX ± .XXX ± (.02), (.005) FRACTIONS: ±1/64 MM DIMENSIONS: (IN.) Mechanical Characteristics1 Mechanical Angle ................................................................................................................Continuous Torque (Starting & Running) ............................................................0.18 N-cm (0.25 oz.-in.) maximum Mounting.............................................................................170-200 N-cm (15-18 lb.-in.) maximum Shaft Runout................................................................................................0.025 mm (0.001 in.) T.I.R. Shaft End Play ...............................................................................................0.13 mm (0.005 in.) T.I.R. Shaft Radial Play ...........................................................................................0.08 mm (0.003 in.) T.I.R. Backlash ........................................................................................................................0.1 º maximum Weight ..........................................................................................................................................18 gm Terminals.......................................................................................................................Rear turret type Soldering Condition Manual Soldering................................96.5Sn/3.0Ag/0.5Cu solid wire or no-clean rosin cored wire 370 °C (700 °F) max. for 3 seconds Wave Soldering ........................................................96.5Sn/3.0Ag/0.5Cu solder with no-clean flux 260 °C (500 °F) max. for 5 seconds Wash processes ..................................................................................................Not recommended Marking ................................Manufacturer’s name and part number, resistance value and tolerance, linearity tolerance, wiring diagram, and date code Ganging (Multiple Section Potentiometers) .................................................................1 cup maximum Hardware ...................................................One lockwasher (H-37-1) and one mounting unit (H-38-1) is shipped with each potentiometer. 2 5.08 R (.20) 2 CCW WIPER 3 1 CW CLOCKWISE Recommended Part Numbers Part Numbers Resistance (Ω) 6638S-1-102 6638S-1-502 6638S-1-103 1,000 5,000 10,000 BOLDFACE LISTINGS ARE IN STOCK AND READILY AVAILABLE THROUGH DISTRIBUTION. FOR OTHER OPTIONS CONSULT FACTORY. REV. 10/19 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. Legal Disclaimer Notice This legal disclaimer applies to purchasers and users of Bourns® products manufactured by or on behalf of Bourns, Inc. and P[ZHɉSPH[LZJVSSLJ[P]LS`¸)V\YUZ¹ Unless otherwise expressly indicated in writing, Bourns® products and data sheets relating thereto are subject to change ^P[OV\[UV[PJL