Metal Film Resistors
Metal Film Resistors
Welwyn Components
MFR Series
MFR Series
· Professional grade approved to
Professional grade and 019 to
BSCECC 40101-803 approved
BSCECC 40101-803 and 019
Tolerances down to 0.5%
Tolerances down to 0.5%
Temperature coefficient down to 50ppm/°C
Optional RoHS compliant or Lead bearing
Temperature coefficient down to 50ppm/°C
wire finishes
·
·
·
Electrical Data
Power rating at 70°C
Resistance range
Limiting element voltage
TCR
Resistance tolerance
MFR3
0.4
10R - 1M
200
50
1
watts
ohms
volts
ppm/°C
%
MFR4
0.5
1R0 - 1M
350
50
0.5, 1
MFR5
0.75
1R0 - 1M
350
≤10:150 >10:1001
0.5, 1
Note 1 - Tighter TCRs are available on professional grade, consult factory for details.
CECC 40101 - 019 Requirements
Power rating at 70°C
watts
Resistance range.
ohms
Limiting element voltage
volts
TCR
ppm/°C
Resistance tolerance
FZ
FX
0.25
0.25
1 to 1M
1 to 1M
250
250
100
250
5.1 to 9.1 : 200 5.1 to 9.1 : 500
1
1
%
CECC 40101 - 803 Requirements
Power rating at 70°C
watts
Resistance range.
ohms
Limiting element voltage
volts
TCR
ppm/°C
Resistance tolerance
%
BC
0.125
10 to 1M
200
50
0.5, 1
BK
0.125
10 to 1M
200
100
0.5, 1
EZ
0.5
10 to 1M0
350
100
EX
0.5
10 to 1M
350
250
1
1
CC
0.25
10 to 1M
250
50
0.5, 1
CK
0.25
10 to 1M
250
100
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
Ambient temperature range
Product grades available
°C/watt
°C
150
140
-55 to 155
commercial, professional
commercial
112
professional
Physical Data
Dimensions (mm) & Weight (g)
Type
MFR3
MFR4
MFR5
L max
D max
F min
d nom
PCB
mount
centres
Min
bend
radius
Wt.
nom
Commercial
3.7
2.0
22.4
0.45
7.6
0.5
0.1
Professional
6.2
2.5
21.0
0.6
10.2
0.6
0.3
Commercial
6.8
3.0
21.0
0.55
10.2
0.6
0.3
Professional
9.0
3.6
19.6
0.8
12.7
1.2
0.5
d
D
L
f
General Note
General Note
TT electronics reserves reserves the make to make changes in specification without notice or notice or liability.
Welwyn Components the right to right changes in product product specification without liability.
All information is subject to Welwyn’s own data and is considered accurate at time of of going to print.
All information is subject to TT electronics’ own data and is considered accurate at timegoing to print.
A subsidiary of
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
TT electronics plc
© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK
© TT electronics plc822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Telephone: +44 (0) 1670
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