MP312 [ETC]
Power Film Resistors; 功率薄膜电阻
ETC 
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 Ω 200 K .600 (15.24) .188 (4.78)
10 Ω 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
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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