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| 248, 249 Vishay Spectrol 1/2" (12.7 mm) Conductive Plastic & Cermet Potentiometers FEATURES * Model 248/249 retains the proven high performance characteristics in a more cost effective package * Cost effective panel potentiometers * P.C.B. mounting potentiometers RoHS COMPLIANT DIMENSIONS in millimeters (inches) METAL OR PLASTIC SHAFTS X = STANDARD LEADS SCREWDRIVER SLOT SHOWN IN MID ELECTRICAL TRAVEL 12.7 (0.500) 0.4 7.6 (0.300) 0.4 0.8 (0.30) WIDE x 0.8 (0.03) DEEP 0.0 O 6.35 (0.250) - 0.05 9.5 (0.375) 22.22 (0.875) 0.75 MOUNTING SURFACE 12.7 (0.500) 0.4 0.41 (0.016) 6.9 (0.272) 2.54 (0.100) 0.25 2.54 (0.100) 0.25 0.5 (0.020) MARKING MODEL & RESISTANCE DATA CODE 3/8" - 32 NEF - 2A 0.36 (0.014) 5.08 (0.200) 0.25 METAL SHAFT 1/4" - 32 NEF - 2A VISHAY O 3.18 (0.125) 0.025 9.5 (0.375) 19.05 (0.750) 0.75 TERMINAL PINS x 3 E = REAR STAND OFF P.C. BOARD SURFACE 6.76 (0.266) 3.18 D = REAR LOCATING LUGS 2.34 3.14 7.62 8.5 3.18 (0.125) 0.36 2.54 1.0 TYP 10.16 2.55 TYP 2 CW 12.70 MTGLUG CI. 1 3 Tolerance unless otherwise specified 0.5 www.vishay.com 111 Document Number: 57054 Revision: 02-Jul-07 For technical questions, contact: sfer@vishay.com 248, 249 Vishay Spectrol 1/2" (12.7 mm) Conductive Plastic & Cermet Potentiometers ELECTRICAL SPECIFICATIONS PARAMETER Element Type Total Resistance Range Resistance Tolerance Power rating Temperature Coefficient of Resistance Linearity Tolerance Contact Resistance Variation Insulation Resistance Dielectric Strength End Resistance Effective Electrical Angle MODEL 248 conductive plastic MODEL 249 cermet 500 to 1 M 20 % 20 % (on request 10 %) 0.5 W at 70 C 1.0 W at 70 C Both derated to zero at 125 C 1000 ppm/C 100 ppm/C 5 % Independent 5 % of the Total Resistance 1000 M minimum, 500 VDC 750 VRMS minimum 50/60 Hz 2 maximum each end 265 5 MECHANICAL SPECIFICATIONS Rotation Torque End Stop Torque Weight Max Tightening Torque Sealing 295 5 Starting and Running 1.5 to 18.75 mNm 0.35 Nm (50 oz-in) 8.3 g's (0.29 oz) (1/4" x 7/8" FMF metal shaft) 0.50 Nm (1/4" Bush) 0.70 Nm (3/8" Bush) IP50 ENVIRONMENTAL SPECIFICATIONS Temperature Range Shock Vibrations Rotational Life (Electrical) Load Life at 70 C - 55 C to + 125 C 390 meters/sec/sec. 1000 bumps 98 meters/sec/sec. 0.75 mm, 10 to 500 Hz 25 000 cycles 1000 hours STANDARD RESISTANCE ELEMENT DATA 248/249: 500R, 1K, 2K, 5K, 10K, 25K, 50K, 100K, 250K, 500K, 1M PACKAGING Carton box of 50, code: BO50 MARKING Unit identification: Manufacturer's name and model number, EIA resistance value coding, tolerance, data code and terminal Identification. ORDERING INFORMATION 248 MODEL 248/249 JE SPECIAL FEATURES D: Rear locating lugs E: Rear stand off J: CW audio taper 8 SHAFT OPTIONS 7: 6.35 (1/4") plastic 8: 3.18 (1/8") plated brass 9: 6.35 (1/4") plated brass 08 FMF SHAFT OPTIONS 08: 19.05 (3/4") for 3.18 (1/8") plated brass 10: 22.22 (7/8") for 6.35 (1/4") plated brass or plastic versions 103 EIA RESISTANCE CODE e3 LEAD FINISH e3: pure Sn Example: 248 - JE - 8 - 08 - 103 SAP PART NUMBERING GUIDELINES 2 4 8 B B H S 0 E B 2 5 1 0 3 M L MODEL BUSHING SHAFT SHAFT LEADS MATERIAL PACKAGING OHMIC VALUE/TOL/LAW OR SPECIAL See the end of this data book for conversion tables www.vishay.com 112 For technical questions, contact: sfer@vishay.com Document Number: 57054 Revision: 02-Jul-07 Legal Disclaimer Notice Vishay Disclaimer All product specifications and data are subject to change without notice. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, "Vishay"), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay's terms and conditions of purchase, including but not limited to the warranty expressed therein, which apply to these products. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications. Product names and markings noted herein may be trademarks of their respective owners. Document Number: 91000 Revision: 18-Jul-08 www.vishay.com 1 |
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