*R oH V SC AV ER OM AI SIO PL LA N IA BL S NT E Features ■ 3/8 ” Square/ Multiturn / Cermet / Industrial / Sealed ■ Five popular terminal styles ■ Standoffs ■ RoHS compliant* version available ■ For trimmer applications/processing guidelines, click here 3299 - 3/8 ” Square Trimpot® 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. Standard Resistance Table Product Dimensions 3299P Common Dimensions 2.54 (.100) 1.09 (.043) .38 (.015) 9.53 (.375) 2.54 (.100) 1.12 (.044) 1.52 (.060) 10.03 (.395) 6.22 ± 1.14 (.245 ± .045) 6.10 +.30/-.25 (.240 +.012/-.010) 3 .51 ADJ. SLOT 2 DIA. TYP. (.020) 2.29 DIA. 1 (.090) .56 X (.022) WIDE 5.23 .64 2.54 (.206) X (.025) DEEP (.100) BOTTOM VIEW 1.91 3299W (.075) 2.54 (.100) 3 How To Order 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 3299 W - 1 - 103 LF 1 BOTTOM VIEW 2.54 (.100) MIN. 2.54 (.100) 3 Standard or Modified Product Indicator -1 = Standard Product 2 Resistance Code 1.91 (.075) 1 BOTTOM VIEW 3299Y 2.54 (.100) 2.54 (.100) Model Style 3299X 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. 2 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 % ΔTR, 10 Megohms IR) Vibration ....... 20 G (1 % ΔTR; 1 % ΔVR) Shock ......... 100 G (1 % ΔTR; 1 % ΔVR) Load Life ............. 1,000 hours 0.5 watt @ 70 °C (3 % ΔTR; 3 % or 3 ohms, whichever is greater, CRV) Rotational Life .......................200 cycles (4 % ΔTR; 3 % or 3 ohms, whichever is greater, CRV) 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 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 DIMENSIONS: TOLERANCES: ± 0.25 (.010) MM (INCHES) EXCEPT WHERE NOTED REV. 08/10 *RoHS Directive 2002/95/EC Jan 27 2003 including Annex. “Trimpot” is a registered trademark of Bourns, Inc. †“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.