MODEL 78 1 1-1/4" Rectangular Multiturn Cermet Trimming Potentiometer ELECTRICAL Standard Resistance Range, Ohms Standard Resistance Tolerance Input Voltage, Maximum Slider Current, Maximum Power Rating, Watts End Resistance, Maximum Actual Electrical Travel, Turns, Nominal Dielectric Strength Insulation Resistance, Minimum Resolution Contact Resistance Variation, Maximum 10 to 2Meg 10% (<100 Ohms = 20%) 300 Vdc or rms not to exceed power rating 100mA or within rated power, whichever is less 1.0 at 70C derating to 0 at 125C 2 Ohms 22 500 Vrms 1,000 Megohms Essentially infinite 1% or 1 Ohm, whichever is greater ENVIRONMENTAL Seal Temperature Coefficient, Maximum Operating Temperature Range Thermal Shock Moisture Resistance Shock, 6ms Sawtooth Vibration High Temperature Exposure Rotational Life Load Life at 1.0 Watts Resistance to Solder Heat 85C Fluorinert(R) (No Leaks) 100ppm/C -55C to +125C 5 cycles, -55C to +125C (1% RT, 1% VR) Ten 24 hour cycles (1% RT, IR 1,000 Megohms Min.) 100G's (1% RT, 1% VR) 20G's, 10 to 2,000 Hz (1% RT, 1% VR) 250 hours at 125C (2% RT, 2% VR) 200 cycles (3% RT) 1,000 hours at 70C (2% RT) 260C for 10 sec. (1% RT) MECHANICAL Mechanical Stops Torque, Starting Maximum Weight, Nominal Clutch Action, both ends 5oz.-in. (0.035 N-m) .09 oz. (2.6 grams) Fluorinert(R) is a registered trademark of 3M Company. Specifications subject to change without notice. 1-61 Model 78 SIDE ADJUSTMENT (Inch/mm) Model 78P Circuit Diagram Marked On This Surface Housing Molded Plastic Model No. & Resistance Value Marked On This Surface 0.07 1.78 1.25 31.75 1.000 .005 25.400 0.127 .015 .003 0.127 0.076 2 Mounting Holes .093 .005 I.D. 2.362 0.127 Metal Adjustment Screw .110/2.794 0.127 Dia. With .025/0.635 0.127 Wide X .031/0.787 0.127 Deep Slot (1) (2) .125 .005 3.175 0.127 .105 2.667 .32 8.13 .135 .50 .03 (3) 3.429 12.70 0.76 .195 .005 4.953 0.127 3 Terminals Pins Solderable .028 .003 Dia. 0.711 0.076 .05 1.27 .10 2.54 .30 7.62 .260 .015 6.604 0.381 .70 17.78 Note: Model 78P dimensions applicable to all other models except as noted. Model 78L .062/1.575 Max. Meniscus 3 Electrical Leads - 6/152 Min. Length No. 30 AWG Teflon Insulated Stranded Wire Yellow (1) Red (2) Green (3) .187 .031 4.750 0.787 Model 78S .156 .031 Dia. 3.962 0.787 (3 Places) .70 .02 17.78 0.51 (1) (2) (3) .30 .02 7.62 0.51 .26 .02 6.60 0.51 1-62 3 Terminals Pins Solderable .028 .003 Dia. 0.711 0.075 .05 .02 1.27 0.51 .10 .02 2.54 0.51 Model 78 PANEL MOUNT ADAPTER (Inch/mm) 1 Model 56BW (Adapter Only) Metal Bushing Mount Brass-Nickel Plated Mounting Surface .125 .005 Dia. Hole 3.175 0.127 Use .22/5.613 Dia. Min. Mounting Hole Lock Washer, Panel Nut, Sealing Washer & Mounting Screws Provided 1.56 Max. 3.962 .312 .015 7.925 0.381 .437 Max. 11.100 Model 78LBW (Adapter Pre-Assembled with Trimmer) 0.94 Max. 2.388 .250 .015 6.350 0.381 1.344 Max. 34.138 12-28 UNF-2A Thread Model 78SBW (Adapter Pre-Assembled with Trimmer) 0.94 Max. 2.388 .250 .015 6.350 0.381 1.344 Max. 34.138 (1) (2) (3) 12-28 UNF-2A Thread .344 .031 8.738 0.787 1-63 Model 78 STANDARD RESISTANCE VALUES, OHMS 10 20 50 100 200 500 1K 2K 5K 10K 20K 25K 50K 100K 200K 250K 500K 1Meg 2Meg PACKAGING Standard: Boxes Capacity = 25 Units ORDERING INFORMATION 78 P BW R 10K LF RoHS Compliant Code - optional Resistance Value Resistance Prefix Optional Panel Mount Adapter Model Series Pin Style Note: Use `56BW' to order panel mount adapter without trimmer NOTES CIRCUIT DIAGRAM Metric equivalents, based on 1 inch = 25.4mm are rounded to the same number of significant figures as in the original English units and are provided for general information only. (2) (1) (3) INCH mm Tolerances unless otherwise specified: Linear = .01 inches (.25mm) Angular = 2 degrees CW 1-64 Model 78 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: TT Electronics: 78LBWR2KLF 78LR100LF 78LR100KLF 78LR1KLF 78LR500KLF 78PBWR2KLF 78PBWR50LF 78PR10LF 78PR100KLF 78PR1KLF 78PR200LF 78PR200KLF 78PR25KLF 78PR2KLF 78PR500LF 78PR500KLF 78SBWR50KLF 78PR6.5MEG 78PR1MEG 78LBWR10K 78LR2KLF 78LR200LF 78LR2MEGLF 78PR25K 78LBWR20LF 78LBWR250KLF 78PR2MEGLF 78LBWR1KLF 78LBWR200LF 78PBWR100KLF 78PBWR10KLF 78PBWR1MEGLF 78PBWR20LF 78PBWR2MEGLF 78PBWR500LF 78PR1MEGLF 78PR20LF 78PR50LF 78LBWR10LF 78LR20KLF 78PBWR100LF 78LR50KLF 78PBWR10LF 78PBWR1KLF 78PBWR250KLF 78PBWR5KLF 78PR100LF 78LBWR50LF 78LBWR500LF 78LBWR500KLF 78LR250KLF 78LR25KLF 78LR500LF 78PBWR20KLF 78PBWR500KLF 78PBWR50KLF 78PR250KLF 78LBWR100KLF 78LBWR200KLF 78LR1MEGLF 78LR20LF 78LR50LF 78LR5KLF 78PBWR200LF 78PBWR200KLF 78PBWR25KLF 78LBWR100LF 78LBWR10KLF 78LBWR1MEGLF 78LBWR25KLF 78LR10LF 78LBWR2MEGLF 78LBWR50KLF 78LBWR20KLF 78LBWR5KLF 78LR10KLF 78LR200KLF 78SBWR100LF 78SR50LF 78SR25KLF 78SBWR100KLF 78SBWR20LF 78SR100LF 78SBWR50LF 78SBWR5KLF 78SBWR2KLF 78SR100KLF 78SBWR20KLF 78SBWR500LF 78SR500KLF 78SBWR1KLF 78SBWR200LF 78SR1MEGLF 78SBWR200KLF 78SR10LF 78SR250KLF 78SBWR250KLF 78SR2MEGLF 78SR10KLF 78SBWR500KLF