Metal Glaze High Power
Density Surface Mount
Power Resistor
Metal Glaze thick film
MRC Series
element fired at 1000C to
solid ceramic substrate
1/2 watt in 1/8 watt package
1 watt in 1/2 watt package (2010 footprint)
MRC1/2: 0.05 to 1.0
(contact factory for higher values)
High temperature
150C maximum operating temperature
dielectric coating
Superior surge handling capability
60/40 Solder over nickel barrier
Environmental Data
Size Industry IRC Max. Working Max. Resistance Tolerance TCR Product
1 2 3 3 3
Code Footprint Type Power Rating Voltage Voltage Range (ohms) (%) (ppm/C) Catagory
0.1 to 0.99 1,2,5 100 Low Range
C 1206 MRC1/2 1/2W @ 70C 200 400 1.0 to 10K 1,2,5 50,100 Standard
20 to 10K 0.25, 0.5 50,100 Tight Tolerance
0.05 to 0.099 2,5 200 Low Range
E 2010 MRC1 1W @ 70C 350 700
0.10 to 1.0 1,2,5 100 Low Range
MRC Applications:
The MRC1/2 will dissipate 1/2 watt at 70C on a 1206 footprint, while the MRC 1 will dissipate 1 watt at 70C on
a 2010 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 and 2010 resistors are marginal or failing.
Environmental Data
Characteristics Maximum Change Test Method
Temperature Coefcient As specied MIL-R-55342E Par 4.7.9 (-55C + 125C)
Thermal Shock (0.5% + 0.01) MIL-R-55342E Par 4.7.3 (-65C + 150C, 5 cycles)
Low Temperature Operation (0.25% + 0.01) MIL-R-55342E Par 4.7.4 (-65C @ working voltage)
MIL-R-55342E Par 4.7.5
Short Time Overload (1.0% + 0.01)
2.5 x PxR for 5 seconds
High Temperature Exposure (0.5% + 0.01) MIL-R-55342E Par 4.7.6 (+150C for 100 hours)
MIL-R-55342E Par 4.7.7
Resistance to Bonding Exposure (0.25% + 0.01)
(Reow soldered to board at 260C for 10 seconds)
Solderability 95% minimum coverage MIL-STD-202, Method 208 (245C for 5 seconds)
Moisture Resistance (0.5% + 0.01) MIL-R-55342E Par 4.7.8 (10 cycles, total 240 hours)
Life Test (1.0% + 0.01) MIL-R-55342E Par 4.7.10 (2000 hours @ 70C intermittent)
(1% + 0.01) 1200 gram push from underside of mounted chip
Terminal Adhesion Strength
no mechanical damage for 60 seconds
(1% + 0.01) Chip mounted in center of 90mm long board, deected 5mm
Resistance to Board Bending
no mechanical damage so as to exert pull on chip contacts for 10 seconds
General Note
IRC reserves the right to make changes in product specication without notice or liability.
All information is subject to IRCs own data and is considered accurate at time of going to print.
A subsidiary of
TT electronics plc
IRC Wirewound and Film Technologies Division
4222 South Staples Street Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 Facsimile: 361 992 3377 Website: www.irctt.com MRC Series Issue June 2008 Sheet 1 of 2
Metal Glaze High Power
Density Surface Mount
Power Resistor
Repetitive Surge Curve
1000
MRC 1
100
MRC 1/2
10
1
0.0001 0.001 0.01 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 70C. Surge handling capacity
for low-repetitive surges may be significantly greater than shown above.
Contact factory for recommendations.
Power Derating Curve Ordering Data
Sample Part No. MRC1/2 - 100 - 1000 - F - 13
100
IRC Type
(MRC 1/2 & MRC 1)
Temperature Coefcient
60 50 ppm, 100 ppm, 200 ppm
Resistance Value
(100 and greater - First 3 signicant gures plus 4th digit multiplier)
Example: 100 = 1000, 1000 = 1001, 150,000 = 1503
0
(Less than 100 - is used to designate decimal)
Example: 51 = 51R0, 1 = 1R00, 0.25 = R250
25 70 150
Tolerance
Ambient Temperature (C)
(C = 0.25%, D = 0.5%, F = 1.0%, G = 2.0%, J = 5.0%)
Packaging Code*
(BLK = Bulk, 7 = 7" Reel, 13 = 13" Reel)
IRC Wirewound and Film Technologies Division
4222 South Staples Street Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 Facsimile: 361 992 3377 Website: www.irctt.com MRC Series Issue June 2008 Sheet 2 of 2
Peak Power (watts)
% Of Rated Power