al Film Resistors
Flameproof Power
es
Flameproof Power
Metal Film Resistors
Metal Film Resistors
Welwyn Component
Welwyn Components
MFP Series
st size for power rating
MFP Series
·
Smallest size for power rating
nce range 0.1 ohms to 1M
rating
•
Smallest size for power
ohms
•
·
Resistance range 0.1 ohms
to 1M ohms
Resistance range 0.1 ohms
•
Flameproof protection
roof protection
·
Flameproof protection to 1M ohms
Electrical Data
MFP1
watts
ohms
volts
<1
Ω:
0.7
>=1
Ω:
1.0
0R1 – 1M
MFP2
2
1R0 – 1M
350
100
1, 2, 5
82
350
Power rating at 70°C
Resistance range
Limiting element voltage
TCR
Resistance tolerance
Standard values
Ambient temperature range
cal Data
MFP1
< 1
Ω:
300
1
200
≥10 Ω:
<1
Ω:
Ω
- 9.1
Ω:
>=1
Ω:
1.0
50
0.7
MFP2
2
1R0 – 1M
100
g at 70°C
watts
ppm/°C
ohms
ppm/°C
%
%
ange
0R1 – 1M
120
E24 preferred
-55 to 155
Thermal impedance
ment voltage
volts
°C/watt
°C
< 1
Ω:
300
1
Ω
- 9.1
Ω:
200
≥10 Ω:
50
1, 2, 5
E24 preferred
olerance
ues
Physical Data
Dimensions (mm) & Weight (g)
edance
°C/watt
PCB
mounting
120
-55 to 155
Wt.nom
0.3
0.55
d
D
82
mperature range
Type
°C
Min.
bend
radius
0.6
1.2
L
f
L Max
6.2
10.0
D Max
2.5
4.0
f min
21.0
27.0
d nom
0.6
0.8
centres
10.2
18.4
cal Data
MFP1
MFP2
Construction
The resistance
s (mm) & Weight (g)
element is a precisely controlled thin film of
metal alloy on a high purity ceramic core, protected by a
PCB
Min.
cement coating applied so that terminations remain
completely clear. This permits a well defined body length
mounting bend
to clean
d nom
L).
D
(clean lead
f min
lead dimension
centres
Max
radius
Marking
Resistors are colour coded with 4 or 5 bands depending on
value and tolerance. IEC 62 colours are used.
Solvent Resistance
The
Wt.nom
body protection and marking are resistant to all normal
d
industrial cleaning solvents suitable for printed circuits.
D
0.3
L
f
Flammability
0.55
The resistor coating will not burn or emit incandescent
particles under any condition of applied temperature or
power overload.
Marking
Max
6.2
2.5
21.0
Terminations
Strength
0.6
10.2
0.6
1.2
10.0
Material
Solder-coated copper wire.
4.0
27.0
0.8
18.4
ion
The terminations meet the requirements of
IEC 68.2.21
ons
e element is a precisely
115-1, Clause
thin film of
Resistors are colour coded with 4 or 5 bands depending on
IEC
controlled
4.17.3.2
n a high purity ceramic core, protected by a
value and tolerance. IEC 62 colours are used.
ng applied so that terminations remain
General Note
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
lear. This
TT electronics reserves the
to
defined body
product specification without notice or liability.
Resistance
permits a
subject
right to make changes
and is
length
accurate at time
Solvent
A subsidiary of
All information is
well
Welwyn’s own data
in
considered
of going to print.
TT electronics plc
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
o clean lead dimension L).
Limited
· Bedlington, Northumberland NE22 7AA, UK
body protection and marking are resistant to all normal
The
© Welwyn Components
Issue D · 03.06
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© TT electronics plc
industrial cleaning solvents suitable for printed circuits.
11. 11
Solderability
The terminations meet the requirements of
143
Flameproof Power
Flameproof Power
Metal Film Resistors
Metal Film Resistors
MFP
Series
MFP
Series
Welwyn Components
Performance Data
Maximum
Load at rated power : 1000 hours at 70°C
Shelf life : 12 months at room temperature
Derating from rated power at 70°C
Climatic
Climatic category
Temperature rapid change
Resistance to solder heat
Voltage proof
∆
R %
∆
R %
volts
∆
R %
∆
R %
∆
R %
∆
R %
5
2
zero at 155°C
3
50/155/56
0.5
0.5
500 min
Application Notes
1. If the resistors are to dissipate full rated power, it is
recommended that the terminations should not be
soldered closer than 4mm from the body.
2. Due to operating temperature limitations imposed by some
pcb materials, derating may be necessary. An estimate of
the temperature rise to be expected can be calculated
using the thermal impedance figures given under Electrical
Data.
3. MFP resistors an also be supplied pre-formed.
Packaging
MFP resistors are normally 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 shown in lead
Form Information section.
Figure 1
Type
b
(mm)
MFP1
52
MFP2
68
5
f
1
6
b
f
2
6
Ordering Procedure
Type
Value (use IEC62 code)
F
G
J
Body location f
1
– f
2
≤
1.4 mm
Example: MFP2 at 4.7 kilohms and 1% tolerance in ammo pack box of 2000 pieces –
MFP2–4K7F
I
Tolerance (use IEC62 code)
1%
2%
5%
Packing
I
Ammo
MFP1
MFP2
5000/box
2000/box
Standard
General Note
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 ·
make changes in product
829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
TT electronics reserves the right to
Facsimile: +44 (0) 1670
specification without notice or liability.
Issue D · 03.06
144
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
11. 11
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