Metal Film Resistors
Welwyn Components
MFR4P Series
•
Smallest size for power rating
•
Resistance range: 1 ohm to 1M ohms
•
Temperature coefficient down to 50ppm/°C
Electrical Data
MFR4P
Power rating at 70°C
Resistance range
Limiting element voltage
TCR
Resistance tolerance
Standard values
Thermal impedance
Ambient temperature range
*Below 1 ohm 5% preferred
°C/watt
°C
watts
ohms
volts
ppm/°C
%
0.6
0R22 to 1M
250
<1R: 300 >=1R: 50
0.5, 1, 2, 5*
E24 preferred
130
-55 to 155
Physical Data
Dimensions (mm) & Weight (g)
PCB
Type
MFR4P
L Max
6.2
D Max
2.5
f min
21.0
d nom
0.6
mounting
centres
10.2
Min.
bend
radius
0.6
Wt.nom
0.3
d
D
L
f
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.
This permits a well defined body length,
(clean lead to clean lead dimension L).
Marking
Resistors are colour coded with 6 bands. IEC 62 colours are
used.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
Terminations
Material
Strength
Solder-coated copper wire.
The terminations meet the requirements of
IEC 68.2.21
Solderability
The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
A subsidiary of
TT electronics plc
Issue D · 03.06
© 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
138
Metal Film Resistors
MFR4P Series
Welwyn Components
Performance Data
Maximum
Load at rated power : 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
∆
R %
∆
R %
∆
R %
∆
R %
µV/V
ohms
volts
∆
R %
∆
R %
∆
R %
∆
R %
0.5
0.1
Zero at 155°C
0.5
0.5
55/125/56
1
0.5
0.5
0.5
0.1
>1G
500 min
Packaging
MFR4P resistors are supplied tape packed ready for loading
onto automatic sequencing and insertion machines.
The standard taping method and critical dimensions are
shown in Figure 1.
Component wires will not protrude beyond the outside edge
of the tapes.
Alternative packaging available by request.
Lead Formed resistors can also be supplied. Standard options
of Lancet, Radial and Goalpost forming are available by
request.
f
1
6
52
f
2
6
Figure 1
5
Body location f
1
– f
2
≤
1.4 mm
Ordering Procedure
Example: MFR4P at 6.8 kilohms and 5% tolerance in ammo pack box of 5000 pieces
–
MFR4P
–
6K8J
I
Type
Value (use IEC62 code)
Tolerance (use IEC62 code)
D
F
0.5%
1%
G
J
2%
5%
Packing
I
Ammo
MFR4P
5000/box
Standard
© 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 · 03.06
139
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