Power Metal
Resistors
Metal
Power Resistors
Film
Film Resistors
Power Metal Film Resistors
MF-S Series
Small size for power rating
MF-S Series
MF-S Series
Range of 4 sizes: 0.5 watt to 3 watt at 70˚C
Small size for power rating
Flameproof protection
Range of 4 sizes: 0.5 watt to 3 watt at 70˚C
Small size for power rating
Flameproof protection
Range of 4 sizes: 0.5 watt to 3 watt at 70°C
Flameproof protection
Welwyn Components
Welwyn Components
Electrical Data
Electrical Data
Power rating at 70° C
Resistance range
Power rating Limiting element voltage
at 70° C
Resistance range
TCR
Limiting element voltage
Isolation voltage
TCR
Resistance tolerance
Isolation voltage
Standard values
Resistance tolerance
Thermal impedance
Standard values
Ambient temperature range
Thermal impedance
All Pb-free parts comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)
MF1/2S
watts
MF1/2S
ohms
0.5
volts
ppm/° C
volts
%
° C/watt
°C
140
0.5
MF1S
1.0
MF1S
1.0
MF2S
– 1M
0R1
2.0 350
MF2S
2.0
MF3S
3.0
MF3S
3.0
watts
ohms
volts
ppm/° C
volts
%
° C/watt
°C
0R1 – 1M
< 10 :150
< 10 :350
350
500
<
< 10 :350
< 1 105 :150 >1 : 1, 2, 5
:
500
E24 preferred 700
<
>1
140 1 : 5
110 : 1, 2, 5 80
E24 preferred -55 to 155
110
80
60
-55 to 155
700
60
Physical Data
Dimensions (mm)
Physical Data
& Weight (g)
Dimensions (mm) & Weight (g)
Ambient temperature range
PCB
Min.
Wt.nom
0.3
0.5
0.9
1.1
d
D
L
d
D
L
f
f
Type
MF1/2S
MF1S
MF2S
MF3S
9.0
+0
MF3S
-0.6
12.5
+0 -2.1
14.5
+0.6 -0
mounting bend
d
PCB
-0.06
Min.
D
+0.01
Type
LL
Mx
D Max
f min
d nom
centres
radius
6.2
2.5
mounting bend
10.2
MF1/2S
+0 -0.5
0.6
1.02
0.6
+0 -0.25
d 21.0
D
9.0
f min
LL
Mx
D Max
d nom
radius Wt.nom
3.6 +0.01 -0.06
centres
MF1S
19.6
0.8
12.7
1.2
+0 -0.6
+0.5 -0
6.2
2.5
10.2
4.2
21.0
0.6
1.02
0.6
0.3
12.5
+0
MF2S
+0 -0.25
-0.5
17.8
0.8
18.4
1.2
+0 -2.1
3.6
14.5
+0.5 -0
+0.6 -0
4.2
+0.8 -0
5.3
+0 -0.4
+0.8 -0
5.3
19.6
+0 -0.4
17.8
0.8
23.8
0.8
0.8
12.7
0.8
18.4
20.3
1.2
20.3
1.2
1.2
0.51.2
0.9
1.1
23.8
General Note
General Note
General Note
Welwyn Components reserves the right to make changes in ·product specification without notice 7AA, UK
© Welwyn Components Limited
Bedlington, Northumberland NE22 or liability.
TT Electronics reserves the right to make changes in product specification without notice or liability.
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.
BI Technologies IRC Welwyn
Issue C · 03.08
01.06
06.18
A subsidiary of
TT electronics plc
All information is subject to +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 ofEmail: info@welwyn-tt.com · Website: www.welwyn-tt.com
Telephone: Welwyn’s own data and is considered accurate at time · going to print.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670
© TT Electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
A subsidiary of Issue C · 03.08
01.06
TT electronics plc
www.ttelectronics.com/resistors
147
Power Metal
Power
Flameproof
Film Resistors
Resistors
Metal Film
MF-S Series
MF-S Series
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.
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).
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.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© 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
06.18
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.
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670
© TT Electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
03.08
Issue C · 01.06
06.18
148
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