Power Metal
Power Metal
Power Metal
Film Resistors
Film Resistors
Film Resistors
MF-S Series
MF-S Series
MF-S Series
Small size for power rating
Small
for
for power rating
Small size
size
power rating
Range of 4 sizes: 0.5 watt to 3 watt at 70˚C
Range
sizes: 0.5
0.5
to 3 watt at 70°C
Range of 4
of 4 sizes:
watt
watt to 3 watt at 70˚C
Flameproof protection
Flameproof protection
Flameproof protection
Welwyn Components
Welwyn Components
·
·
·
Electrical Data
Electrical Data
Power rating at 70° C
Power rating at 70° C
Resistance range
Resistance range
Limiting element voltage
Limiting element voltage
TCR
TCR
Isolation voltage
Isolation voltage
Resistance tolerance
Resistance tolerance
Standard values
Standard values
Thermal impedance
Thermal impedance
Ambient temperature range
Ambient temperature range
MF1/2S
MF1S
MF2S
MF3S
MF1/2S
MF1S
MF2S
MF3S
watts
0.5
1.0
2.0
3.0
watts
0.5
1.0
2.0
3.0
0R1 – 1M
ohms
0R1 – 1M
ohms
volts
350
volts
350
< 10 :150
ppm/° C
< 10 :350
< 10 :150
ppm/° C
< 10 :350
700
500
volts
700
500
volts
<1 : 5
%
>1 : 1, 2, 5
<1 : 5
%
>1 : 1, 2, 5
E24 preferred
E24 preferred
140
110
80
60
° C/watt
140
110
80
60
° C/watt
-55 to 155
°C
-55 to 155
°C
Physical Data
Physical Data
Min.
PCB
Min.
mounting bend
mounting bend
d
D
+0.01 -0.06
d
Type
LL
Mx
D Max
f min
d nom
centres
radius Wt.nom
D
+0.01 -0.06
centres
Type
LL
Mx
D Max
f min
d nom
radius Wt.nom
2.5
10.2
MF1/2S
+06.2
21.0
0.6
1.02
0.6
0.3
+0
10.2
MF1/2S
-0.5 +06.2 -0.25 2.5
21.0
0.6
1.02
0.6
0.3
-0.5
+0 -0.25
9.0
3.6
MF1S
0.8
12.7
1.2
0.5
9.0
3.6
19.6
+0
+0.5
MF1S
-0.6 +0 -0.6 -0 +0.5 -0
19.6
0.8
12.7
1.2
0.5
4.2
12.5
MF2S
0.8
18.4
1.2
0.9
+0.8 -0 4.2
17.8
+0 -2.1 12.5
MF2S
17.8
0.8
18.4
1.2
0.9
5.3 +0.8 -0
14.5 +0 -2.1
MF3S
23.8
0.8
20.3
1.2
1.1
5.3
14.5
+0.6
MF3S
-0 +0.6 +0 -0.4 +0 -0.4
23.8
0.8
20.3
1.2
1.1
-0
Dimensions (mm) & Weight (g)
Dimensions (mm) & Weight (g)
PCB
d
D
d
D L
L
f
f
General Note
Welwyn
General Note
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.
General Note
TT electronics reserves the right to
Limited
· Bedlington, Northumberland NE22 7AA, UK
liability.
© Welwyn Components
make changes in product specification without notice or
©
+44
subject
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com
Telephone:
Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK ·
print.
All information is
(0) 1670
to TT electronics’ own data and is considered accurate at time of going to
Website: www.welwyn-tt.com
Welwyn Components reserves the data and is considered accurate specification without notice or liability.
All information is subject to Welwyn’s ownright to make changes in productat time of going to print.
A subsidiary of
A subsidiary of
TT electronics plc
TT electronics plc
Issue C · 03.08
01.06
Issue C · 01.06
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
03.08
© TT electronics plc
01.13
147
147
Power Metal
Power
Flameproof
Film Resistors
Resistors
Metal Film
MF-S
Series
MF-S
Series
Construction
The resistance element is a precisely controlled thin film of
metal alloy on a high purity ceramic core, protected by a
cement coating applied so that terminations remain
completely clear.
This permits a well defined body length, (clean lead to clean
lead dimension L).
Welwyn Components
Marking
MF Series resistors are colour coded with 5 bands for 1%
tolerance or 4 bands for other tolerances. 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
Flammability
The resistors will not burn or emit incandescent particles
under any condition of applied temperature or power
overload.
Solderability
The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2
Performance Data
Maximum
Load: 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
R%
R%
R%
R%
R%
R%
5
1
zero at 155˚ C
1
40/125/56
0.5
0.5
Application Notes
1. If the resistors are to dissipate full rate 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. Lead Formed resistors can also be supplied. Standard
options of Lancet, Radial and Goalpost forming are shown
in lead Form Information section.
Packaging
The preferred method of packaging is taped and ammo
packed, see figure 1 for critical dimensions.
Alternative packaging is available by special request.
Figure 1
c
f
1
6
Body location f
b
1
f
2
6
–f
2
1.4 mm
Type
MF
1
/
2
S
MF1S
MF2S
MF3S
b
52 2
52 2
52 2
67 2
c
5 0.5
5 0.5
5 0.5
10 0.5
General Note
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.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© 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
© TT electronics plc
148
03.08
Issue C · 01.06
01.13
Flameproof
Power Metal
Power
Film Resistors
Resistors
Metal Film
MF-S Series
MF-S Series
Welwyn Components
Ordering Procedure
Example: MF3S at 3.3 kilohms and 5% tolerance in ammo pack box of 1000 pieces –
MF3S–3K3J
I
Type
Value (use IEC62 code)
Tolerance (use IEC62 code)
F
G
1%
2%
J
5%
Packing
I
Ammo
MF1/2S
MF1S
MF2S
MF3S
5000/box
2500/box
1500/box
1000/box
Standard
General Note
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.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
03.08
Issue C · 01.06
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© TT electronics plc
148
01.13
