Metal Film Resistors
MFR Series
Welwyn Components
Performance Data - Type MFR 5
CECC 40101-019
Requirements
Load at commercial rating :
1000 hours at 70°C
Load at CECC rating :
1000 hours at 70°C
Shelf life :
12 months at room temperature
Derating
Short term overload
Climatic
Climatic category
Long term damp heat
Temperature rapid change
Resistance to solder heat
Vibration and bump
Noise. (in a decade of frequency)
Insulation resistance
Voltage proof
Pulse handling
R%
R%
R%
R%
µV/V
ohms
volts
R%
R%
R%
R%
R%
2
Not specified
zero at 155°C
0.5
2
55/125/56
2
0.5
0.5
0.5
Not Specified
>1G
700 min
1
Not Specified
zero at 155°C
0.25
1
55/125/56
1
0.25
0.25
0.25
Not Specified
>1G
500 min
0.5
0.25
0.25
0.1
0.1
>1G
700 min
0.3
0.04
0.07
0.01
0.07
>1G
700 min
0.25
0.5
0.01
0.2
CECC 40101-803
Requirements
Actual Performance
Maximum
Typical
0.9
0.5
0.1
See Graph 3
See Graph 3
0.07
Data available upon request
Graph 3 – Load for 1000 hours at 70°C: maximum changes
Packaging
All MFR resistors are supplied tape packed ready for loading
on to automatic sequencing and insertion machines.
Component wires will not protrude beyond the outside edge
of the tapes.
Alternative packaging available by request.
Construction
The resistance element is a precisely controlled thin film of
metal alloy sputtered on to a high purity ceramic core,
protected by a moisture-resistant, high dielectric strength
coating applied so that terminations remain completely clear.
Terminations
Material
Hot tin dipped copper wire
The terminations meet the requirements of
IEC 68.2.21
Strength
5
f
1
6
52
f
2
6
f
1
– f
2
≤
1.4 mm
Solderability
The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2
Marking
0.5% and 1% tolerance resistors are colour coded with 5
bands, 2% tolerance has 4. IEC 62 colours are used.
Lead Formed resistors can also be supplied. Standard options
of Lancet, Radial and Goalpost forming are available.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Issue D · 05.07
137
WELWYN [ WELWYN COMPONENTS LIMITED ]
