MP312 and MP330 Power Film Resistors Chassis Mounted Precision Power Film Resistors with Center Screw Mounting Type MP Chassis Mounted Power Film Resistors are made with Micronox® resistance films fired onto a ceramic substrate which is thermally bonded to an anodized aluminum base. By mounting this assembly directly to a metal surface for improved heat transfer, the high power capabilities of these unique resistors can provide increased packaging densities in many types of electronic equipment. The special performance features of these Type MP Chassis Mounted Power Film Resistors include: • Two case sizes that provide 15 Watt and 30 Watt ratings. • Operation up to 275°C. • Single screw mounting to simplify attachment to the chassis or other heat conducting surface. • A molded silicone case that encapsulates the resistor assembly to meet stringent environmental specifications. • Extended life stability better than 0.01% per 1,000 hours has been Specifications: demonstrated through a 5 1/2 year, 50,000 hour program of continuous load life testing. Resistance High WattMax. Dielect. age † Voltage Strength Temp TC †† Model No. Dimensions in inches and (millimeters) Min. Max. A B .188 (4.78) .185 (4.70) .092 (2.34) .250 (6.35) .250 (6.35) .142 (3.61) MP312 15 300 600 50 10 Ω 200 K .600 (15.24) MP330 30 450 1,000 50 10 Ω 200 K .850 (21.59) DERATING CURVE 100 40 1 0 20 0 TYPICAL R-T CURVE 2 80 60 -1 25 75 125 175 225 D †† TC: 50 ppm/°C referenced to +25°C, ΔR taken at +150°C and +275°C. (Low temp. TC will be nominally -85 ppm/°C at -55°C. See typical R-T curve.) %∆R RATED LOAD, % † MP312 15 Watt power rating based on chassis mounting on a 6" X 4" X 2" X .040" aluminum chassis, MP312 free air rating is 2.5 Watts at 25°C. MP330 30 Watt power rating based on chassis mounting on a 7"X 5" X 2" X .040" aluminum chassis, MP330 free air rating is 5.0 Watts at 25°C. C 275 -55 0 50 100 150 200 250 TEMPERATURE, °C AMBIENT TEMPERATURE, °C Stacked Type MP Power Film Resistor Assemblies Stacked Type MP assemblies - constructed by bolting resistors between aluminum heat dissipating plates - provide a simple means of further improving packaging densities. These charts of power ratings versus air flow and chassis area show the high power levels that can be achieved with forced air cooling and with convection cooling in either vertical or horizontal orientation. POWER RATING 25 CONVECTION COOLING PLATES IN HORIZONTAL PLANE .2 .3 .4 .7 1 2 3 4 7 10 AIR FLOW (CFM)/EACH RESISTOR Applications Engineering 17271 North Umpqua Hwy. Roseburg, Oregon 97470-9422 Phone: (541) 496-0700 Fax: (541) 496-0408 © 2004 Caddock Electronics, Inc. 20 30 20 15 l de Mo 40° ±3° 30 P3 .M No B 312 . MP el No Mod 10 5 0 1% MP312 15 W Data is for 25°C still air at 1 atmosphere. Chassis material: Aluminum, .040" thick. 30 CONVECTION COOLING PLATES IN VERTICAL PLANE CADDOCK 100 FOR CHASSIS MOUNTED SINGLE RESISTORS WATTS WATTS/EACH RESISTOR 0 Data is for 25°C air at 1 atmosphere, ducted around resistors in the stack with 2" x 2" x .04" aluminum plates between resistors. To derive total airflow required for stack, multiply airflow/each resistor by the number of resistors in the stack. Ducting is not required when designing for convection. D - HOLE FOR MOUNTING POWER RATING FOR STACKED MP312 POWER RESISTORS 18 16 14 12 10 8 6 4 2 Resistance Tolerance: ±1% (other tolerances on special order). Insulation Resistance: 10,000 Megohms min. Terminal Strength: Mil-Std-202, Method 211, Cond. A (Pull Test) 5 lbs., and Cond. B (Bend Test), ΔR 0.2% max. or 0.2 ohm max., whichever is greater. Thermal Shock: Mil-R-39009, ΔR 0.5% max. or 0.2 ohm max., whichever is greater. Momentary Overload: 2 times rated power with applied voltage not to exceed 1.5 times maximum continuous operating voltage for 5 seconds, ΔR 0.5% max. or 0.2 ohm max., whichever is greater. Moisture Resistance: Mil-Std-202, Method 106, ΔR 0.5% max. or 0.2 ohm max., whichever is greater. Load Life: Mil-R-39009, 1,000 hours at rated power, ΔR 1% max. or 0.2 ohm max., whichever is greater. Power rating dependent upon chassis area. See power rating graphs. Shock, Medium Impact: 50G, Mil-Std-202, Method 205, Cond. C. Vibration, High Frequency: Mil-Std-202, Method 204, Cond. B, ΔR 0.2% max. or 0.2 ohm max., whichever is greater, through shock and vibration sequence. Terminals: Gold Plated Solder Lugs. 1 2 4 6 10 20 40 60 100 B 2 ALUMINUM BASE CHASSIS AREA (SQ. IN.) CADDOCK A C e-mail: [email protected] • web: www.caddock.com For Caddock Distributors listed by country see caddock.com/contact/dist.html DIMENSIONS IN INCHES AND (MILLIMETERS) Sales and Corporate Office 1717 Chicago Avenue Riverside, California 92507-2364 Phone: (951) 788-1700 Fax: (951) 369-1151 28_IL123.1004