*R oH VE S CO AV R M AI SIO PL LA N IA BL S NT E Features 3/8 ” Square/ Multiturn / Cermet / Industrial / Sealed ■ Five popular terminal styles ■ Standoffs ■ Patent #4427966 drive mechanism ■ RoHS compliant* version available ■ 3299 - 3/8 ” Square Trimming Potentiometer Electrical Characteristics Standard Resistance Range ..................................10 to 2 megohms (see standard resistance table) Resistance Tolerance ............±10 % std. (tighter tolerance available) Absolute Minimum Resistance ..............................1 % or 2 ohms max. (whichever is greater) Contact Resistance Variation ...........................1.0 % or 3 ohms max. (whichever is greater) Adjustability Voltage.....................................±0.01 % Resistance ...............................±0.05 % Resolution.....................................Infinite Insulation Resistance ................500 vdc. 1,000 megohms min. Dielectric Strength Sea Level ..................................900 vac 70,000 Feet...............................350 vac Effective Travel..................25 turns nom. Environmental Characteristics Power Rating (300 volts max.) 70 °C ........................................0.5 watt 125 °C .........................................0 watt Temperature Range ....-55 °C to +125 °C Temperature Coefficient ....±100 ppm/°C Seal Test........................85 °C Fluorinert† Humidity........MIL-STD-202 Method 103 96 hours (2 % ∆TR, 10 Megohms IR) Vibration.........20 G (1 % ∆TR; 1 % ∆VR) Shock...........100 G (1 % ∆TR; 1 % ∆VR) Load Life ................1,000 hours 0.5 watt @ 70 °C (3 % ∆TR; 3 % or 3 ohms, whichever is greater, CRV) Rotational Life ........................200 cycles (4 % ∆TR; 3 % or 3 ohms, whichever is greater, CRV) Physical Characteristics Torque .............................3.0 oz-in. max. Mechanical Stops..................Wiper idles Terminals ........................Solderable pins Weight ......................................0.035 oz. Marking ...........................Manufacturer’s trademark, resistance code, wiring diagram, date code, manufacturer’s model number and style Wiper................50 % (Actual TR) ±10 % Flammability ..........................U.L. 94V-0 Standard Packaging .....50 pcs. per tube Adjustment Tool ..............................H-90 3299P Common Dimensions Standard Resistance Table 2.54 (.100) 1.09 (.043) .38 (.015) 9.53 (.375) 1.12 (.044) 1.52 (.060) 10.03 (.395) 6.22 ± 1.14 (.245 ± .045) 6.10 +.30/-.25 (.240 +.012/-.010) 3 ADJ. SLOT 2 2.29 DIA. 1 (.090) .56 WIDE X (.022) X .64 DEEP (.025) 3299W Resistance (Ohms) 10 20 50 100 200 500 1,000 2,000 5,000 10,000 20,000 25,000 50,000 100,000 200,000 250,000 500,000 1,000,000 2,000,000 2.54 (.100) .51 DIA. TYP. (.020) 5.23 2.54 (.206) (.100) BOTTOM VIEW 1.91 (.075) 2.54 (.100) Resistance Code 100 200 500 101 201 501 102 202 502 103 203 253 503 104 204 254 504 105 205 Popular distribution resistance values listed in boldface. Special resistances available. 3 2 How To Order 1 Model 3299X 2.54 (.100) 2.54 (.100) 1.91 (.075) 3 2 BOTTOM VIEW 2.54 (.100) 2.54 (.100) Style Standard or Modified Product Indicator -1 = Standard Product Resistance Code 1 3299Y 3299 W - 1 - 103 LF BOTTOM VIEW 2.54 (.100) MIN. 1.91 (.075) 3 Terminations LF = 100 % Tin-plated (RoHS compliant) Blank = 90 % Tin / 10 % Lead-plated (Standard) Consult factory for other available options. 2 1 2.54 (.100) BOTTOM VIEW 3299Z 2.54 (.100) 2.54 (.100) 1.91 (.075) 3 2 1 2.54 (.100) BOTTOM VIEW 2 CCW WIPER 3 1 CW CLOCKWISE TOLERANCES: ± 0.25 (.010) EXCEPT WHERE NOTED DIMENSIONS ARE: *RoHS Directive 2002/95/EC Jan 27 2003 including Annex. †“Fluorinert” is a registered trademark of 3M Co. Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications. MM (INCHES) REV. 09/04