MF3S [TTELEC]
Power Metal Film Resistors; 功率金属膜电阻器
| 型号： | MF3S |
| 厂家： | 
TT Electronics |
| 描述： | Power Metal Film Resistors |
| 文件： | 总2页 (文件大小：67K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Power Metal
Film Resistors
Welwyn Components
MF-S Series
Small size for power rating
•
Range of 4 sizes: 0.5 watt to 3 watt at 70˚C
•
Flameproof protection
•
Electrical Data
MF1/2S
MF1S
MF2S
MF3S
Power rating at 70˚ C
Resistance range
watts
0.5
1.0
2.0
3.0
ohms
volts
0R1 – 1M
150
0R1 – 470k
Limiting element voltage
TCR
350
ppm/˚ C
volts
< 10 :350
10 :150
700
Isolation voltage
500
Resistance tolerance
Standard values
%
1 : 5, 10 >1 : 1, 2, 5
E24 preferred
Thermal impedance
Ambient temperature range
˚ C/watt
˚ C
140
110
80
60
-55 to 155
Physical Data
Dimensions (mm) & Weight (g)
PCB
Min.
mounting
centres
bend
Type
L Max
6.2
D Max
2.5
f min
21.0
19.6
17.8
23.8
d nom
0.6
radius Wt.nom
MF1/2S
MF1S
MF2S
MF3S
10.2
12.7
18.4
20.3
0.6
1.2
1.2
1.2
0.3
0.5
0.9
1.1
d
D
9.0
3.6
0.8
L
f
12.5
14.5
4.2
0.8
5.3
0.8
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
© 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 · 01.07
147
Flameproof Power
Metal Film Resistors
MF-S Series
Welwyn Components
Construction
Marking
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.
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.
This permits a well defined body length, (clean lead to clean
lead dimension L).
Terminations
Flammability
Material
Solder-coated copper wire.
The resistors will not burn or emit incandescent particles
under any condition of applied temperature or power
overload.
Strength
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
Performance Data
Maximum
Load: 1000 hours at 70˚C
Shelf life: 12 months at room temperature
Derating from rated power at 70˚C
Climatic
R %
R %
R %
R %
5
1
zero at 155˚ C
1
40/125/56
0.5
Climatic category
Temperature rapid change
Resistance to solder heat
R %
R %
0.5
Packaging
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.
The preferred method of packaging is taped and ammo
packed, see figure 1 for critical dimensions.
Alternative packaging is available by special request.
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.
Figure 1
c
3. Lead Formed resistors can also be supplied. Standard
options of Lancet, Radial and Goalpost forming are shown
in lead Form Information section.
f1
f2
b
6
6
Body location f1 – f2 1.4 mm
Standard Quantities Per Package
Type
b
c
5
Type
MF1/2S
MF1S
MF2S
MF3S
MF1/2S
MF1S
MF2S
MF3S
52
52
52
67
Large ammo pack
5000
2500
2500
1000
5
5
10
© 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 · 01.07
148
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