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■ Essentially infi nite resolution ■ Excellent rotational life ■ High quality, rugged construction ■ General purpose applications ■ Non-standard features available ■ Cost and space saving 6539/6639 - Precision Potentiometer *RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011. Specifi cations are subject to change without notice. The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time. Users should verify actual device performance in their specifi c applications. Electrical Characteristics1 6539 Servo Mount 6639 Bushing Mount Dielectric Withstanding Voltage (MIL-STD-202, Method 301) Power Rating (Voltage Limited By Power Dissipation or 300 VAC, Whichever is Less) Environmental Characteristics1 Temperature Coeffi cient Moisture Resistance (MIL-STD-202, Method 106) Mechanical Characteristics1 Torque (Starting & Running) Soldering Condition 370 °C (700 °F) max. for 3 seconds 260 °C (500 °F) max. for 5 seconds tolerance, linearity tolerance, wiring diagram, and date code. is shipped with potentiometer. Product Dimensions *RoHS COMPLIANT BOURNS 30 °±3 ° TYP. CW 6539 6639 3/8 " - 32 UNEF 1 3 CW CLOCKWISE CCW

2 WIPER

12.70 ± .38 (.500 ± .015) 3.170 +.000/-.008 DIA. SHAFT 45° ± 5 ° x (.010) CHAMFER .25 1.57 (.062) 1.57 (.062) 1.57 19.81 (.780) DIA. .51 (.020) REF 12.70 ± .79 (.500 ± .031) 3.18 (.125) 22.23 (.875) DIA. 11.25 ± .38 (.443 ± .015) 1.57 (.062) 22.23 (.875) DIA. 6.342+.000/-.008 DIA. SHAFT SLOT (.047) X (.063) 1.19 1.60 10.317+.000/-.051 3.18 (.125) .25 (.010) REF 9.53 ± .79 (.375 ± .031) 22.23 ± .76 (.875 ± .03) R4.83 (.19) TOLERANCES: EXCEPT WHERE NOTED FRACTIONS: ±1/64 MMDIMENSIONS: (IN.) 45° ± 5 ° x (.010) CHAMFER.25

6539/6639 - Precision Potentiometer Panel Thickness Dimensions Specifi cations are subject to change without notice. The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time. Users should verify actual device performance in their specifi c applications. REV. 10/11 10.44 ± .07 (.411 ± .003) DIA. MM (INCHES)DIMENSIONS: Panel thickness and hole diameters are recommended for best fit. However, customers may adjust the dimensions to suit their specific application. TOLERANCES: ± 0.127 (.005) (For Bushing Mount Only) PANEL POT LOCKWASHER HEX NUT 2.46 - 3.81 (.097 - .150) BOLDFACE LISTINGS ARE IN STOCK AND READILY AVAILABLE THROUGH DISTRIBUTION. FOR OTHER OPTIONS CONSULT FACTORY. Recommended Part Numbers Part Number Resistance (Ω) 6539S-1-102 1,000 6539S-1-502 5,000 6539S-1-103 10,000 Part Numbers Resistance (Ω)Continuous Turn Mechanical Stops 6639S-1-102 6639S-301-102 1,000 6639S-1-202 2,000 6639S-1-502 6639S-301-502 5,000 6639S-1-103 6639S-301-103 10,000 6639S-1-203 20,000