swATTINwATTPAckage
swATTINwATTPAcKAGEfOOTPrINT
sMRC1/2:TO
CONTACTfactorYfORHIGHERvALUES
s#MAXIMUMOPErATINGTEMPErature
s3UPErIORSURGEHANDLINGCAPABILITY
-ETAL'LAze™THIcKFILM
ELEMENTFIREDAT#TO
SOLIDCErAMICSUBSTrate
(IGHTEMPErature
DIELECTrICCOATING
3OLDERovERNIckELBARrIER
ENVIRONMENTAL$ATA
MRC Series
-ETAL'LAzeTM(IGHPowER$ENSITY
SurfACE-OUNTPowER2ESISTOR
MRC Applications:
4HEMRC1/2WILLDISSIPATE1/2wattat#ONafOOTPrINT4HEMRCISRECOMMENDEDforAPPLICATIONSWHERE
BOARDrealestateISaMAJORCONCErN$UEtoHIGHPowerDENSITYANDSUPErIORsurgeHANDLINGCAPABILITy,ITISalso
RECOMMENDEDasaDIRECTREPLACEMENTONeXISTINGBOARDDESIGNSWHERESTANDARDRESISTORSAREMARGINALORfAILING

dohteM tseTegnahC mumixaMscitsiretcarahC
Temperature Coeffi cient !SSPECIfieD -),2%PAR##
Thermal Shock  -),2%PAR#CCYCLES
Low Temperature Operation  -),2%PAR# worKINGvOLTAGE
Short Time Overload -),2%PAR
X0X2fORSECONDS
High Temperature Exposure  -),2%PAR#fORHOURS
Resistance to Bonding Exposure -),2%PAR
2EfloWSOLDEREDTOBOARDAT#fORSECONDS
Solderability MINIMUMCoverage -),34$-ETHOD#fORSECONDS
Moisture Resistance  -),2%PARCYCLEsTOTALHOURS
Life Test  -),2%PARHOURS #INTErMITTENT
Terminal Adhesion Strength 
NOMECHANICALDAMAGE
grAMPUSHFROMUNDERSIDEOFMOUNTEDCHIP
fORSECONDS
Resistance to Board Bending 
NOMECHANICALDAMAGE
#HIPMOUNTEDINCENTEROFMMLONGBOARDDEflECTEDMM
SOASTOeXerTPULLONCHIPCONTACTSfORSECONDS
Size
Code1
Industry
Footprint
IRC
Type
Max.
Power Rating
Working
Voltage2
Max.
Voltage
Resistance
Range (ohms)3
Tolerance
(±%)3
TCR
(ppm/°C)3
Product
Catagory
C6 MRC1/2 7 C 
TO 1,2,  LoW2ANGE
TOK 1,2,  3TANDARD
TOK  4IGHTTolerANCE
%LECTRICAL$ATA
Metal Glaze™ High Power Density
Surface Mount Power Resistor
MRC Series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
© TT electronics plc
09. 12
· 1/2 watt in 1/8 watt package
· MRC1/2: 0.05 Ω to 1.0 Ω
(contact factory for higher values)
· 150°C maximum operating temperature
· Superior surge handling capability
· RoHS compliant Versions available
swATTINwATTPAckage
swATTINwATTPAcKAGEfOOTPrINT
sMRC1/2:TO
CONTACTfactorYfORHIGHERvALUES
s#MAXIMUMOPErATINGTEMPErature
s3UPErIORSURGEHANDLINGCAPABILITY
-ETAL'LAze
™
THIcKFILM
ELEMENTFIREDAT#TO
SOLIDCErAMICSUBSTrate
(IGHTEMPErature
DIELECTrICCOATING
3OLDERovERNIckELBARrIER
ENVIRONMENTAL$ATA
MRC Series
-ETAL'LAzeTM(IGHPowER$ENSITY
SurfACE-OUNTPowER2ESISTOR
MRC Applications:
4HEMRC1/2WILLDISSIPATE1/2wattat#ONafOOTPrINT4HEMRCISRECOMMENDEDforAPPLICATIONSWHERE
BOARDrealestateISaMAJORCONCErN$UEtoHIGHPowerDENSITYANDSUPErIORsurgeHANDLINGCAPABILITy,ITISalso
RECOMMENDEDasaDIRECTREPLACEMENTONeXISTINGBOARDDESIGNSWHERESTANDARDRESISTORSAREMARGINALORfAILING

dohteM tseTegnahC mumixaMscitsiretcarahC
Temperature Coeffi cient !SSPECIfieD -),2%PAR##
Thermal Shock  -),2%PAR#CCYCLES
Low Temperature Operation  -),2%PAR# worKINGvOLTAGE
Short Time Overload -),2%PAR
X0X2fORSECONDS
High Temperature Exposure  -),2%PAR#fORHOURS
Resistance to Bonding Exposure -),2%PAR
2EfloWSOLDEREDTOBOARDAT#fORSECONDS
Solderability MINIMUMCoverage -),34$-ETHOD#fORSECONDS
Moisture Resistance  -),2%PARCYCLEsTOTALHOURS
Life Test  -),2%PARHOURS #INTErMITTENT
Terminal Adhesion Strength 
NOMECHANICALDAMAGE
grAMPUSHFROMUNDERSIDEOFMOUNTEDCHIP
fORSECONDS
Resistance to Board Bending 
NOMECHANICALDAMAGE
#HIPMOUNTEDINCENTEROFMMLONGBOARDDEflECTEDMM
SOASTOeXerTPULLONCHIPCONTACTSfORSECONDS
Size
Code1
Industry
Footprint
IRC
Type
Max.
Power Rating
Working
Voltage2
Max.
Voltage
Resistance
Range (ohms)3
Tolerance
(±%)3
TCR
(ppm/°C)3
Product
Catagory
C6 MRC1/2 7 C 
TO 1,2,  LoW2ANGE
TOK 1,2,  3TANDARD
TOK  4IGHTTolerANCE
%LECTRICAL$ATA
Metal Glaze™ High Power Density
Surface Mount Power Resistor
MRC Series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
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.
© TT electronics plc
09. 12
s3OUTH3TAPLES3TREETs#ORPUS#HRISTITEXAS53!
© IRC Wirewound and Film Technologies Division
TELEPHONE:sFACSIMILE:sWEBSITE:WWWIRCTTCOM
MRC Series
Metal GlazeTM High Power Density
Surface Mount Power Resistor
-2#3ERIES)SSUE!PRIL3HEETOF
Sample Part No.
IRC Type
(MRC 1/2)
Temperature Coeffi cient
50 ppm, 100 ppm, 200 ppm
Resistance Value
(100 and greater - First 3 signifi cant fi gures plus 4th digit multiplier)
Example: 100= 1000, 1000= 1001, 150,000= 1503
(Less than 100 - "R" is used to designate decimal)
Example: 51= 51R0, 1 = 1R00, 0.25 = R250
Tolerance
(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)
RoHS Compliance
LF = RoHS compliant version
Ordering Data
Power Derating Curve
Repetitive Surge Curve
MRC 1/2
1
10
100
1000
0.0001 0.001 0.01 0.1 1
Surge or Pulse Duration (seconds)
Peak Power (watts)
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.
0510752
100
60
0
aR fO % ted rewoP
Ambient Temperature (°C)
MRC1/2 100 1000 F 13 LF