Resistors
Metal Glaze™ High Power Density
Surface Mount Power Resistor
MRC Series
Metal Glaze High Power Density
MRC Series
Surface Mount Power Resistor
TM
1/2 watt in 1/8 watt package
•
MRC1/2: 0.05 Ω to 1.0 Ω (contact factory for higher values)
1/2 watt in 1/8 watt package
•
150°C maximum operating temperature
1 watt in 1/2 watt package (2010 footprint)
•
Superior surge handling capability
MRC1/2: 0.05
Ω
to 1.0
Ω
(contact factory for higher values)
RoHS compliant Versions available
•
150°C maximum operating temperature
•
Superior surge handling capability
Metal Glaze
™
thick film
element fired at 1000°C to
solid ceramic substrate
High temperature
dielectric coating
All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
60/40 Solder over nickel barrier
Electrical Data
Size
Industry
Code
1
Footprint
IRC
Type
Max.
Power Rating
Working
Voltage
2
Max.
Resistance
TCR
Tolerance
Voltage Range (ohms)
3
(ppm/°C)
3
(±%)
3
0.1 to 0.99
C
1206
MRC1/2
1/2W @ 70°C
200
400
1.0 to 10K
20 to 10K
1,2,5
1,2,5
0.25, 0.5
100
50,100
50,100
Product
Catagory
Low Range
Standard
Tight Tolerance
MRC Applications:
The MRC1/2 will dissipate 1/2 watt at 70°C on a 1206 footprint. The MRC is recommended for applications where
board real estate is a major concern. Due to high power density and superior surge handling capability, it is also
recommended as a direct replacement on existing board designs where standard 1206 resistors are marginal or failing.
Environmental Data
Characteristics
Temperature Coefficient
Thermal Shock
Low Temperature Operation
Short Time Overload
High Temperature Exposure
Resistance to Bonding Exposure
Solderability
Moisture Resistance
Life Test
Terminal Adhesion Strength
Resistance to Board Bending
Maximum Change
As specified
±(0.5% + 0.01Ω)
±(0.25% + 0.01Ω)
±(1.0% + 0.01Ω)
±(0.5% + 0.01Ω)
±(0.25% + 0.01Ω)
95% minimum coverage
±(0.5% + 0.01Ω)
±(1.0% + 0.01Ω)
±(1% + 0.01Ω)
no mechanical damage
±(1% + 0.01Ω)
no mechanical damage
Test Method
MIL-R-55342E Par 4.7.9 (-55°C + 125°C)
MIL-R-55342E Par 4.7.3 (-65°C + 150°C, 5 cycles)
MIL-R-55342E Par 4.7.4 (-65°C @ working voltage)
MIL-R-55342E Par 4.7.5
2.5 x
√
PxR for 5 seconds
MIL-R-55342E Par 4.7.6 (+150°C for 100 hours)
MIL-R-55342E Par 4.7.7
(Reflow soldered to board at 260°C for 10 seconds)
MIL-STD-202, Method 208 (245°C for 5 seconds)
MIL-R-55342E Par 4.7.8 (10 cycles, total 240 hours)
MIL-R-55342E Par 4.7.10 (2000 hours @ 70°C intermittent)
1200 gram push from underside of mounted chip
for 60 seconds
Chip mounted in center of 90mm long board, deflected 5mm
so as to exert pull on chip contacts for 10 seconds
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
© TT Electronics plc
11.14
Metal Glaze™ High Power Density
Surface Mount Power Resistor
MRC Series
Physical Data
Metal Glaze High Power Density
Surface Mount Power Resistor
Industry
Metal Glaze High Power Density
Size
IRC Type
Repetitive
Size Code
Curve
Surge
Footprint Actual
Surface Mount Power Resistor
TM
MRC Series
TM
L
C
W
MRC Series
MRC 1/2
1000
C
Dimensions (Inches and (mm))
L
0.128 ± 0.007
(3.25 ± 0.18)
W
Power Derating Curve
C
100
1206
0.063 ± 0.010
(1.60 ± 0.25)
0.020 ± 0.010
(0.51 ± 0.25)
Repetitive Surge Curve
Peak Power (watts)
100
1000
% Of Rated Power
Power Derating Curve
60
100
MRC 1/2
% Of Rated Power
0
Peak Power (watts)
10
100
60
25
70
150
Ambient Temperature (°C)
MRC 1/2
0
1
10
0.0001
0.001
0.01
0.1
1
25
70
150
Ambient Temperature (°C)
Surge or Pulse Duration (seconds)
Note: Use for repetitive pulses where the average power dissipation
is not to exceed the component rating at 70°C. Surge handling capacity
for
1
low-repetitive surges may be significantly greater than shown above.
0.0001
0.001
0.01
Contact factory for recommendations.
0.1
1
Surge or Pulse Duration (seconds)
Note: Use for repetitive pulses where the average power dissipation
is not to exceed the component rating at 70°C. Surge handling capacity
for low-repetitive surges may be significantly greater than shown above.
Contact factory for recommendations.
Ordering Data
Sample Part No.
IRC Type
(MRC 1/2)
MRC1/2
100
1000
F
13
LF
Temperature Coefficient
50 ppm, 100 ppm, 200 ppm
Ordering Data
MRC1/2
100
1000
F
13
LF
Sample Part No.
Resistance Value
(100Ω and greater - First 3 significant figures plus 4th digit multiplier)
Example: 100Ω = 1000, 1000Ω = 1001, 150,000Ω = 1503
IRC Type
(Less than 100Ω - "R" is used to designate decimal)
(MRC 1/2)
Example: 51Ω = 51R0, 1Ω = 1R00, 0.25Ω = R250
Temperature Coefficient
Tolerance
ppm, 200 ppm
50 ppm, 100
(C = 0.25%, D = 0.5%, F = 1.0%, G = 2.0%, J = 5.0%)
Resistance Value
Packaging Code*
- First 3 significant figures plus 4th digit multiplier)
(100Ω and greater
(BLK = Bulk, 7 = 7" Reel, 13 = 13" Reel)
Example: 100Ω = 1000, 1000Ω = 1001, 150,000Ω = 1503
(Less than 100Ω - "R" is used to designate decimal)
RoHS Compliance
1Ω = 1R00, 0.25Ω = R250
Example: 51Ω = 51R0,
LF = RoHS compliant version
Tolerance
(C = 0.25%, D = 0.5%, F = 1.0%, G = 2.0%, J = 5.0%)
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
(BLK = Bulk, 7 = 7" Reel, 13 = 13" Reel)
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
Packaging Code*
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
RoHS Compliance
©
LF =
Electronics plc
version
TT
RoHS compliant
11.14
PCB Design
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