248, 249 www.vishay.com Vishay Spectrol 1/2 (12.7 mm) Conductive Plastic and Cermet Potentiometers FEATURES Model 248: 0.5 W at 70 C (conductive plastic element) Model 249: 1 W at 70 C (cermet element) Cost effective panel potentiometer PCB mounting Tests according to CECC 41000 or IEC 60393-1 Material categorization: for definitions of compliance please see www.vishay.com/doc 99912 DIMENSIONS in millimeters (inches) 0.5 mm ( 0.02 ) X = Standards leads METAL OR PLASTIC SHAFTS Screwdriver slot shown in mid 22.22 (0.875) 0.75 electrical travel Mounting surface 12.7 (0.500) 0.4 7.6 (0.300) 0.4 0.8 (0.30) wide 0.8 (0.03) deep 9.5 (0.375) 0.0 6.35 (0.250) - 0.5 12.7 (0.500) 0.4 3/8 - 32 UNEF - 2A 0.36 (0.014) 0.41 (0.016) 0.5 (0.020) 6.9 (0.272) 5.08 (0.200) 0.25 2.54 (0.100) 0.25 2.54 (0.100) 0.25 METAL SHAFT 1/4 - 32 UNEF - 2A VISHAY 3.18 (0.125) 0.025 9.5 (0.375) 19.05 (0.750) 0.75 Terminal pins x 3 E = Rear stand off D = Rear locating lugs PCB surface. 6.76 (0.266) 3.18 3.14 (0.125) 12.70 8.5 0.36 1.0 typ. 2.55 typ. MTGLUG CI. 10.16 2.54 Revision: 02-Sep-16 Document Number: 57054 1 For technical questions, contact: sferpottrimmers vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc 91000 3.18 7.62 2.34248, 249 www.vishay.com Vishay Spectrol ELECTRICAL SPECIFICATIONS PARAMETER MODEL 248 MODEL 249 Element type Conductive plastic Cermet Total resistance range 500 to 1 M Standard series 1, 2, 5 Resistance tolerance 20 % 20 % (on request 10 %) 0.5 W at 70 C 1.0 W at 70 C 1 0.5 Power rating Linear 0 0 0 25 50 70 100 125 150 0 25 50 70 100 125 150 AMBIENT TEMPERATURE IN C AMBIENT TEMPERATURE IN C 2 CW Circuit diagram 3 1 Temperature coefficient of resistance (typical) 500 ppm/C 150 ppm/C Linearity (typical) 5 % independent Limiting element voltage 300 V Contact resistance variation (typical) 5 % of the total resistance Insulation resistance 1000 M minimum, 500 V DC Dielectric strength 750 V minimum 50 Hz/60 Hz RMS End resistance 2 maximum each end Effective electrical travel 265 5 MECHANICAL SPECIFICATIONS MARKING Mechanical travel 295 5 Vishay trademark Operating torque 0.1 Ncm to 2 Ncm Part number End stop Torque 35 Ncm (50 oz.-inch) Tolerance 1/4 Bush 50 Ncm Max. tightening Torque 3/8 Bush 70 Ncm Date code 8.3 g (0.29 oz.) Weight (1/4 x 7/8 FMF metal shaft) Terminal identification ENVIRONMENTAL SPECIFICATIONS PACKAGING Temperature range -55 C to +125 C - In box of 50 pieces, code B25 (BO50) Climatic category 55/125/4 Sealing IP50 Revision: 02-Sep-16 Document Number: 57054 2 For technical questions, contact: sferpottrimmers vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc 91000 POWER IN W POWER IN W