MP312 [ETC]

Power Film Resistors; 功率薄膜电阻
MP312
型号: MP312
厂家: ETC    ETC
描述:

Power Film Resistors
功率薄膜电阻

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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 51/  
load life testing.  
2
year, 50,000 hour program of continuous  
Resistance Tolerance: ±1% (other tolerances  
on special order).  
Insulation Resistance: 10,000 Megohms min.  
High  
Temp  
TC ††  
Resistance  
Min. Max.  
Dimensions in inches and (millimeters)  
Model Watt-  
Max. Dielect.  
Voltage Strength  
No.  
age  
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.  
A
B
C
D
MP312  
MP330  
15  
30  
300  
450  
600  
50  
50  
10 200 K .600 (15.24) .188 (4.78)  
10 200 K .850 (21.59) .250 (6.35)  
.185 (4.70)  
.250 (6.35)  
.092 (2.34)  
.142 (3.61)  
1,000  
Thermal Shock: Mil-R-39009, ΔR 0.5% max. or  
0.2 ohm max., whichever is greater.  
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.  
†† 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.)  
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.  
DERATING CURVE  
TYPICAL R-T CURVE  
100  
2
1
80  
60  
40  
20  
0
Moisture Resistance: Mil-Std-202, Method 106,  
ΔR 0.5% max. or 0.2 ohm max., whichever is  
greater.  
0
-1  
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.  
-55  
0
50  
100 150 200 250  
25  
75  
125  
175  
225  
275  
TEMPERATURE, °C  
AMBIENT TEMPERATURE, °C  
Shock, Medium Impact: 50G, Mil-Std-202,  
Method 205, Cond. 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.  
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.  
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.  
Terminals: Gold Plated Solder Lugs.  
D - HOLE FOR MOUNTING  
CADDOCK  
POWER RATING  
FOR STACKED MP312 POWER RESISTORS  
POWER RATING  
FOR CHASSIS MOUNTED SINGLE RESISTORS  
100  
1%  
MP312  
15  
W
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.  
Data is for 25°C still air at  
18  
16  
14  
12  
10  
8
30  
1 atmosphere. Chassis material:  
Aluminum, .040" thick.  
25  
20  
15  
10  
5
C
40°  
±3°  
330  
B
A
B
2
CONVECTION COOLING -  
PLATES IN VERTICAL PLANE  
Model No. MP  
No. MP  
312  
6
Model  
4
CONVECTION COOLING -  
PLATES IN HORIZONTAL PLANE  
2
ALUMINUM BASE  
0
0
.7  
1
2
3
4
7
10  
20 30  
.2 .3 .4  
6
10  
20  
40 60 100  
1
2
4
DIMENSIONS IN INCHES AND (MILLIMETERS)  
AIR FLOW (CFM)/EACH RESISTOR  
CHASSIS AREA (SQ. IN.)  
Applications Engineering  
17271 North Umpqua Hwy.  
Roseburg, Oregon 97470-9422  
Phone: (541) 496-0700  
Sales and Corporate Office  
1717 Chicago Avenue  
Riverside, California 92507-2364  
Phone: (951) 788-1700  
CADDOCK  
e-mail: caddock@caddock.com • web: www.caddock.com  
For Caddock Distributors listed by country see caddock.com/contact/dist.html  
Fax: (541) 496-0408  
Fax: (951) 369-1151  
© 2004 Caddock Electronics, Inc.  
28_IL123.1004  

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