FM1/4 [TTELEC]
Fusible Metal Film Resistors; 易熔金属膜电阻器
| 型号： | FM1/4 |
| 厂家： | 
TT Electronics |
| 描述： | Fusible Metal Film Resistors |
| 文件： | 总2页 (文件大小：111K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Fusible Metal Film
Resistors
Welwyn Components
FM Series
• Predictable fusing characteristics
Flameproof protection
•
Electrical Data
FM1/4
0.25
FM1/2
0.5
FM1
1.0
Power rating at 70˚ C
Resistance range
watts
ohms
volts
0R1 - 10K
250
0R1 - 27K
350
0R2 - 1K5
350
Limiting element voltage
TCR
ppm/˚ C
%
250
Resistance tolerance
Standard values
5
E24 preferred
120
Thermal impedance
Ambient temperature range
˚ C/watt
˚ C
150
100
-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
d nom
0.6
radius Wt. nom
d
D
FM1/4
FM1/2
FM1
10.2
12.7
18.4
0.6
1.2
1.2
0.3
0.6
0.9
L
f
9.0
3.4
0.8
12.5
4.2
0.8
Construction
Marking
The metal film is deposited on a high purity ceramic rod. End
caps are force fitted and termination wires welded to the
caps. The resistive film is adjusted to the required value by a
special helical cut; finally the cement protection is applied to
the resistor body and marked with indelible ink.
Resistors are colour coded with five bands. Four of the bands
are used to indicate value and tolerance, with IEC 62 colours
being used. A fifth yellow band denotes constant voltage
fusibility.
Solvent Resistance
The body protection and marking are resistant to all normal
Terminations
Material
Solder-coated copper wire.
industrial cleaning solvents suitable for printed circuits.
Strength
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.
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 C · 01.07
164
Fusible Metal Film
Resistors
Welwyn Components
FM Series
Performance Data
Maximum
Load: 1000 hours at 70˚C
R%
R%
3
Shelf life: 12 months at room temperature
Derating from rated power at 70˚ C
Temperature rapid change
2
zero at 155˚ C
0.5
R%
R%
Resistance to solder heat
0.5
FM1/2 Fuse Times
FM1 Fuse Times
Initial Power (W)
FM1/4 Fuse Times
Initial Power (W)
Packaging
All resistors are supplied tape packed ready for loading on
to automatic sequencing and insertion machines.
The standard taping method and critical dimensions are
shown in figure 1. Component wire will not protrude
beyond the outside edge of the tapes.
Lead Formed resistors can also be supplied. Standard
options of Lancet, Radial and Goalpost forming are shown
in Lead Form Information section.
Initial Power (W)
A detailed Packaging Data Sheet is available on request.
Figure 1
Fusing
After fusing the final resistance value will be 50 times the
initial value.
5
f1
f2
52
6
6
Body Location f1 – f2 1.4 mm
Standard Quantities Per Package
Type
FM1/4
FM1/2
FM1
Large ammo pack
5000
2500
1500
© 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 C· 01.07
165
相关型号：
FM1001-7PAHF
DC-DC Regulated Power Supply Module, 1 Output, 50W, Hybrid, METAL, CASE M02, MODULE
BEL
FM1001-7PD0HF
DC-DC Regulated Power Supply Module, 1 Output, 50W, Hybrid, METAL, CASE M02, MODULE
BEL
FM1001-7PD1AF
DC-DC Regulated Power Supply Module, 1 Output, 50W, Hybrid, METAL, CASE M02, MODULE
BEL
FM1001-7PD1AHF
DC-DC Regulated Power Supply Module, 1 Output, 50W, Hybrid, METAL, CASE M02, MODULE
BEL
FM1001-7PD1AHFU
DC-DC Regulated Power Supply Module, 1 Output, 50W, 168.50 X 111.20 MM, 38.70 MM HEIGHT, METAL, CASE M02, MODULE
BEL
FM1001-7PD1F
DC-DC Regulated Power Supply Module, 1 Output, 50W, Hybrid, METAL, CASE M02, MODULE
BEL
FM1001-7PD1HF
DC-DC Regulated Power Supply Module, 1 Output, 50W, Hybrid, METAL, CASE M02, MODULE
BEL
©2020 ICPDF网 联系我们和版权申明