MODEL 21 1 4mm Surface Mount Chip Cermet Trimming Potentiometers ELECTRICAL Standard Resistance Range, Ohms Standard Resistance Tolerance Input Voltage, Maximum Power Rating, Watts End Resistance, Maximum Actual Electrical Travel, Nominal Resolution Contact Resistance Variation, Maximum 500 to 500K 30% 50 Vdc or rms not to exceed power rating 0.1 at 70C derating to 0 at 100C 1% or 5 Ohms, whichever is greater 250 Essentially infinite 3% ENVIRONMENTAL Temperature Coefficient, Maximum Operating Temperature Range Thermal Shock Rotational Life Load Life at 0.1 Watts Resistance to Solder Heat Humidity Temperature Exposure, Maximum 250ppm/C -40C to +100C 5 cycles, -40C to +100C (5% RT) 25 cycles (10% RT) 1,000 hours at 70C (15% RT) 260C for 5 sec. (2% RT) 40C, 90 to 95% RH, 500 hours (5% RT) 248C, 3 sec. MECHANICAL Torque, Maximum Weight, Nominal 4 oz.-in. (300 gr-cm) .004 oz. (0.11 grams) Specifications subject to change without notice. 1-5 Model 21 TOP ADJUSTMENT Model 21W .06 1.5 .03 .004 0.8 0.10 .02 0.5 ,,,, , , , , , ,,, ,,, , .09 Max. 2.2 .15 3.8 .02 .01 0.4 0.2 .03 0.7 .09 Dia 2.2 ,,, , .18 4.5 .05 1.2 .01 0.3 .13 3.4 .02 .008 0.5 0.20 .01 0.3 (2) (1) .04 1.0 .04 1.0 .04 1.0 TOP ADJUSTMENT Model 21X .09 Max. 2.2 .06 1.5 .03.004 0.80.10 .02 0.5 ,,, ,, ,,,,, , , , , , , ,,,, ,,, , .15 3.8 .02.01 0.40.2 .09 Dia 2.2 .18 4.5 .027 0.68 Typ. .01 0.2 .01 0.2 .02.008 0.50.20 (3) (2) (1) .03 0.7 .06 1.5 .04 1.0 .135(.027 x 5) 3.40 (0.68 x 5) 1-6 Model 21 TOP ADJUSTMENT 1 Model 21Z .09 2.2 Max. .03 . 004 0.8 0.1 .07 .004 1.8 0.1 ,,,, , , ,, , , , ,,, ,,, , ,,, ,, , , ,, , .15 3.8 .14 Dia. 3.5 .05 Dia. 1.2 Slot .022 .002 Wide x 0.55 0.05 .016 .002 Deep x 0.40 0.05 .095 .002 Long 2.40 0.05 (2) .085 .004 2.15 0.1 .18 4.5 .08 .004 2.0 0.1 .13 3.4 2x .01 R. 0.2 .02 .002 0.6 0.06 .03 .004 0.8 0.1 (3) (1) .03 .004 0.8 0.1 .03 .004 0.8 0.1 RECOMMENDED PCB LAYOUT Model 21W Model 21X .09 2.4 .09 2.4 .08 2.0 .06 1.6 .06 1.6 .09 2.4 .07 1.9 .09 2.4 .22 5.6 .17 4.2 .07 1.7 .06 1.4 .10 2.6 .22 5.6 .05 1.2 .06 1.5 .21 5.4 .08 2.1 .06 1.6 .07 1.7 Model 21Z .04 1.0 .04 1.0 .16 4.0 .04 1.0 1-7 .05 1.3 .04 0.9 .07 1.8 .14 3.6 .04 0.9 Model 21 STANDARD RESISTANCE VALUES, OHMS 500 1K 2K 5K 10K 20K 50K 100K 200K 500K PACKAGING Standard: Boxes Capacity Option: = 200 units Embossed Tape All units oriented with terminal pads adjacent to sprocket holes Tape: Reel: Width Sprocket Capacity Diameter = = = = 12 mm 4 mm Pitch 750 units 7" (178mm) ORDERING INFORMATION 21 X R 10K Standard: Model Series Style Resistance Value Resistance Prefix Option: 21 X R 10K TR Style Packaging Option TR = Tape & Reel NOTES CIRCUIT DIAGRAM Models 21X AND 21Z Model 21W English equivalents are based on 1 inch = 25.4mm and are provided for general information only. (2) (1) (2) CW (3) (1) INCH mm Tolerances unless otherwise specified: Linear = 0.3 mm (.01 in.) CW 1-8 Model 21