Power Metal
Resistors
Power Metal
Welwyn Components
Film Resistors
Welwyn Components
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 70C
Small size for power rating
Flameproof protection
RangeSmall siz ofe f or4 sizes:power 0.5rating watt to 3 watt at 70C
Range of 4 sizes: 0.5 watt to 3 watt at 70C
Flameproof protection
Flameproof protection
AllAll Pb-Pb-frfreeee partsparts ccomplyomply withwith EUEU DirDirectivectivee 2011/65/EU2011/65/EU amended amended b yb y(EU) (EU) 2015/863 2015/863 (R (RoHS3)oHS3)
Electrical Data
MF1/2S MF1S MF2S MF3S
Electrical Data
Power rating at 70 C watts 0.5 1.0 2.0 3.0
MF1/2S MF1S MF2S MF3S
0R1 1M
Resistance range ohms
Power rating at 70 C watts 0.5 1.0 2.0 3.0
Limiting element voltage volts 350
0R1 1M
Resistance range ohms
TCR ppm/ C < 10 :350 10 :150
Limiting element voltage volts 350
Isolation voltage volts 500 700
TCR ppm/ C < 10 :350 10 :150
<
Resistance tolerance % 1 : 5 >1 : 1, 2, 5
Isolation voltage volts 500 700
Standard values E24 preferred
<
Resistance tolerance % 1 : 5 >1 : 1, 2, 5
140 110 80 60
Thermal impedance C/watt
Standard values E24 preferred
Ambient temperature range C -55 to 155
140 110 80 60
Thermal impedance C/watt
Ambient temperature range C -55 to 155
Physical Data
Dimensions (mm) & Weight (g)
Physical Data
PCB Min.
Dimensions (mm) & Weight (g)
mounting bend
d
L D PCB Min.
Type L Mx D Max f min +0.01 -0.06d nom centres radius Wt.nom
6.2 2.5
mounting bend
MF1/2S 10.2
21.0 0.6 1.02 0.6 0.3
+0 -0.5 +0 -0.25
d d
L D D
Type L Mx D Max f min +0.01 -0.06d nom centres radius Wt.nom
9.0 3.6
MF1S L
19.6 0.8 12.7 1.2 0.5 f
+0 -0.6 +0.5 -0
6.2 2.5
MF1/2S 4.2 10.2
12.5 21.0 0.6 1.02 0.6 0.3
+0 -0.5MF2S +0 -0.25 d
17.8 0.8 18.4 1.2 0.9
+0.8 -0
+0 -2.1
D
9.0 3.6
MF1S
19.65.3 0.8 12.7 1.2 0.5 L f
14.5
+0 -0.6 +0.5 -0
MF3S
23.8 0.8 20.3 1.2 1.1
+0 -0.4
+0.6 -0
4.2
12.5
MF2S
17.8 0.8 18.4 1.2 0.9
+0.8 -0
+0 -2.1
5.3
14.5
MF3S
23.8 0.8 20.3 1.2 1.1
+0 -0.4
+0.6 -0
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
A subsidiary of
All information is subject to Welwyns own data and is considered accurate at time of going to print.
General Note TT electronics plc
General Note
BI Technologies IRC Welwyn
Welwyn Components reserves the right to make changes in product specification without notice or liability.
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyns own data and is considered accurate at time of going to print. A subsidiary of
Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com Issue C 03.0801.06
All information is subject to TT Electronics own data and is considered accurate at time of going to print.
TT electronics plc
www.ttelectronics.com/resistors
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
147
Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com Issue C 03.0801.06
TT Electronics plc
06.18
147
<
<Power Metal
Flameproof Power
Film Resistors
Metal Film Resistors
MF-S Series
Welwyn Components
MF-S Series
Construction Marking
The resistance element is a precisely controlled thin film of MF Series resistors are colour coded with 5 bands for 1%
metal alloy on a high purity ceramic core, protected by a tolerance or 4 bands for other tolerances. IEC 62 colours
cement coating applied so that terminations remain are used.
completely clear.
Solvent Resistance
This permits a well defined body length, (clean lead to clean The body protection and marking are resistant to all normal
lead dimension L). industrial cleaning solvents suitable for printed circuits.
Terminations Flammability
Material Solder-coated copper wire. The resistors will not burn or emit incandescent particles
under any condition of applied temperature or power
Strength The terminations meet the requirements of
overload.
IEC 68.2.21
Solderability The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2
Performance Data
Maximum
Load: 1000 hours at 70C R % 5
Shelf life: 12 months at room temperature R % 1
Derating from rated power at 70C R % zero at 155 C
Climatic R % 1
Climatic category 40/125/56
Temperature rapid change R % 0.5
Resistance to solder heat R % 0.5
Packaging
Application Notes
The preferred method of packaging is taped and ammo
1. If the resistors are to dissipate full rate power, it is
packed, see figure 1 for critical dimensions.
recommended that the terminations should not be
soldered closer than 4mm from the body.
Alternative packaging is available by special request.
2. Due to operating temperature limitations imposed by some
Figure 1
pcb materials, derating may be necessary. An estimate of
the temperature rise to be expected can be calculated
c
using the thermal impedance figures given under Electrical
Data.
3. Lead Formed resistors can also be supplied. Standard
f f
1 2
options of Lancet, Radial and Goalpost forming are shown
b
6 6
in lead Form Information section.
Body location f f 1.4 mm
1 2
Type b c
1
MF /2S
52 2 5 0.5
MF1S
52 2 5 0.5
MF2S
52 2 5 0.5
MF3S 67 2
10 0.5
General Note
BI Technologies IRC Welwyn
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.ttelectronics.com/resistors
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
T TT Electronics plcelephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com Issue C 01.0603.08
06.18
148