Resistors
Metal Film Resistors
Metal Film Resistors
Welwyn Components
MFR Series
MFR Series
Professional grade approved to BSCECC 40101-803 and 019
Professional grade approved to
BSCECCTolerances do 40101-803wn to 0.5% and 019
Temperature coefficient down to 50ppm/C
Tolerances down to 0.5%
Temperature coefficient down to 50ppm/C
AllAll partsparts araree Pb-Pb-frfreeee andand ccomplyomply withwith EUEU DirDirectivectivee 2011/65/EU2011/65/EU amendedamended bbyy (EU)(EU) 2015/8632015/863 (R(RoHS3)oHS3)
Electrical Data
MFR3 MFR4 MFR5
Power rating at 70C watts 0.4 0.5 0.75
Resistance range ohms 10R - 1M 1R0 - 1M 1R0 - 1M
Limiting element voltage volts 200 350 350
TCR ppm/C 50 50 10:150 >10:100
Resistance tolerance % 1 0.5 , 1 0.5 , 1
CECC 40101 - 019 Requirements FZ FX EZ EX
Power rating at 70C watts 0.25 0.25 0.5 0.5
Resistance range. ohms 1 to 1M 1 to 1M 10 to 1M0 10 to 1M
Limiting element voltage volts 250 250 350 350
TCR ppm/C 100 250 100 250
5.1 to 9.1 : 200 5.1 to 9.1 : 500
Resistance tolerance % 1 1 1 1
CECC 40101 - 803 Requirements BC BK CC CK
Power rating at 70C watts 0.125 0.125 0.25 0.25
Resistance range. ohms 10 to 1M 10 to 1M 10 to 1M 10 to 1M
Limiting element voltage volts 200 200 250 250
TCR ppm/C 50 100 50 100
Resistance tolerance % 0.5 , 1 0.5, 1 0.5, 1 0.5, 1
These tables indicate the CECC specification requirements, and these are met or exceeded by the corresponding MFR series products.
.
E24, E96 preferred
Standard values
Thermal impedance C/watt 150
140 112
Ambient temperature range C -55 to 155
Product grades available commercial commercial, professional professional
Physical Data
Dimensions (mm) & Weight (g)
PCB Min
Wt.
D max F min d nom mount bend
Type L max
nom
centres radius
MFR3 Commercial d
3.7 2.0 22.4 0.45 7.6 0.5 0.1
D
L f
Professional 6.2 2.5 21.0 0.6 10.2 0.6 0.3
MFR4
Commercial
6.8 3.0 21.0 0.55 10.2 0.6 0.3
MFR5 Professional 9.0 3.6 19.6 0.8 12.7 1.2 0.5
General Note
General Note
BI Technologies IRC Welwyn
TT Electronics reserves the right to make changes in product specification without notice or liability.
Welwyn Components reserves the right to make changes in product specification without notice or liability.
A subsidiary of
All information is subject to Welwyns own data and is considered accurate at time of going to print.
All information is subject to TT Electronics own data and is considered accurate at time of going to print.
www.ttelectronics.com/resistors
TT electronics plc
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
TT Electronics plc
Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com 11. 09
06.18
135Metal Film Resistors
Metal Film Resistors
Welwyn Components
MFR Series
MFR Series
Performance Data - Type MFR 3
CECC 40101-019 Actual Performance
*
Requirements Maximum Typical
Load at commercial rating : 1000 hours at 70C Grap h 1
Load at CECC rating : 1000 hours at 70C R % 2 0.5 See Graph 1
Shelf life : 12 months at room temperature R % Not Specified 0.1 0.07
D ing zer o at C
Short term overload R % 0.5 0.25 0.03
Climatic R % 2 0.5 0.2
Clim ta i c c gory 55 / / 65
Long term damp heat R % 2 0.5 0.3
Temperature rapid change R % 0.5 0.25 0.05
Resistance to solder heat R % 0.5 0.25 0.02
Vibration and bump R % 0.5 0.1 0.01
Noise. (in a ed c of fr qe cy) N specified 7
nI s luatoi n resistance o mh s > G1 > G1 > G1
oV ltag e pr oo f volts min min min
Pulse handling Data available upon request
* CECC requirements are included for reference only; CECC release is not available on MFR3
Graph 1 Load for 1000 hours at 70C: maximum changes
Performance Data - Type MFR 4
CECC 40101-019 CECC 40101-803 Actual Performance
Requirements Requirements Maximum Typical
Load at commercial rating :
Grap h 2
1000 hours at 70C
Load at CECC rating :
R % 2 1 0.5 See Graph 2
1000 hours at 70C
Shelf life :
R % Not specified Not Specified 0.1 0.07
12 months at room temperature
D ing zer o at C zer o at C
Short term overload R % 0.5 0.25 0.25 0.01
Climatic R % 2 1 0.5 0.2
Clim ta i c c gory 55 / / 65 55 / / 65
Long term damp heat R % 2 1 0.5 0.3
Temperature rapid change R % 0.5 0.25 0.25 0.04
Resistance to solder heat R % 0.5 0.25 0.25 0.07
Vibration and bump R % 0.5 0.25 0.1 0.01
Noise. (in a decade of frequency) V/V Not Specified Not Specified 0.1 0.1
Insulation resistance ohms >1G >1G >1G >1G
oV ltag e pr oo f volts min min min min
uP ls e dling Dat a availabl e re uq est
Graph 2 Load for 1000 hours at 70C: maximum changes
General Note
BI Technologies IRC Welwyn
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.
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
www.ttelectronics.com/resistors
Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
TT Electronics plc
136
06.18
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