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 QUICK REFERENCE DATA Multiple module No Switch module n/a Detent module n/a Special electrical laws A: linear, L: logarithmic Sealing level IP 50 Lifespan 10K cycles DIMENSIONS in millimeters (inches) 0.5 mm ( 0.02 ) B Screwdriver slot shown Mounting surface in mid electrical travel 12.7 0.4 (0.500 0.016) 9.5 10 1 (0.375) (0.395) (0.039) S C 0.6 0.36 (0.024) (0.014) 5.08 (0.200) 2.54 0.25 2.54 0.25 (0.100 0.010) (0.100 0.010) AB CS VERSION BUSHING / SHAFT SHAFT BUSHING SCREWDRIVER L SLOT B / BH 1/8 3/4 1/4 0.8 F / GJ 1/4 7/8 3/8 1.2 Revision: 30-Aug-17 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 0.6 (0.024) 8.5 (0.335) 12.7 0.4 (0.500 0.016) A 248, 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 0.5 1 Power rating Linear 0 0 25 50 70 150 0 100 125 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 model Operating torque 0.1 Ncm to 2 Ncm Vishay logo End stop torque 35 Ncm (50 oz.-inch) Variation law Max. tightening torque 150 Ncm SAP code for ohmic value 8.3 g (0.29 oz.) Tolerance in % Weight (1/4 x 7/8 FMF metal shaft) Date code (4 digits) Terminal identification 3 for lead 3 ENVIRONMENTAL SPECIFICATIONS Temperature range -55 C to +125 C PACKAGING Climatic category 55 / 125 / 4 In box of 25 pieces, code BO25 Sealing IP 50 Note Hardware supplied in separate bags Revision: 30-Aug-17 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