FUSIBLE METAL FILM
RESISTOR
ISO-9001
Registered
FA8025
SERIES
•
Flameproof
•
Predictable fusing characteristics
ELECTRICAL DATA:
Commercial
Power Rating at 70°C
Resistance Range
Limiting Element Voltage
TCR
Resistance Tolerance
Standard Values
Thermal Impedance
Operating Temperature Range
watts
ohms
volts
ppm/°C
%
°C/watt
°C
FA8225
0.25
0.1 - 10K
250
250
Controlled helix
gives fusing
characteristics
Flameproof
protection
Solder coated
copper wire
140
FA8325
0.5
0.1 - 27K
350
250
5
2% EIA values preferred
90
-55 to 155
FA8425
1.5
1 - 22K
500
250
70
PHYSICAL DATA:
Construction:
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 helical cut;
finally the cement protection is applied to the resistor body and
marked with indelible ink.
Termination:
Solder-coated copper wire.
DIMENSIONS (Inches and (mm)) & WEIGHT (G)
L
D
max max
PCB
Min
mounting Bend Wt.
f
d
min nom centers Radius nom
.024
.402
.827 .024
0.3
(0.6)
(10.2)
(21) (0.6)
.500
.047
.772 .031
0.6
(12.7)
(1.2)
(19.6) (0.8)
.941
.031
.724
(18.4)
.047
(1.2)
1.1
d dia
D
L
f
Type
Marking:
Resistors are color coded with five bands. Four of the bands are
used to indicate value and tolerance, with IEC 62 colors being
used. A fifth yellow band denotes constant voltage fusibility.
Solvent Resistance:
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
Flammability:
The resistors will not burn or emit incandescent particles under
any condition of applied temperature or power overload.
.275 .090
FA8225
(7.0) (2.3)
.394
FA8325
(9.0)
.571
FA8425
(14.5)
.134
(3.4)
.201
(5.1) (23.9) (0.8)
PERFORMANCE DATA:
Performance
Maximum
Load: 1000 hours at 70°C
Shelf Life: 12 months at room temperature
Derating from Rated Power at 70°C
Temperature Rapid Change
Resistance to Solder Heat
∆R%
∆R%
∆R%
∆R%
2
0.5
zero at 155°C
0.5
0.5
0.2
0.2
Typical
0.5
0.2
WIREWOUND AND FILM TECHNOLOGIES DIVISION
736 Greenway Road
•
Boone, North Carolina 28607-1860
•
Tel: 828-264-8861
•
Fax: 828-264-8866
•
www.irctt.com
1
ISO-9001
Registered
PREDICTED FUSING TIME FOR DEFINED POWER INPUT:
FA8225
(1R0 - 9R1
& 1K1 - 10K)
FA8225
(0R1 - R91)
FA8325
(10R - 1K5)
FA8425
(10R - 91OR)
FA8325
(0R1 - 9R1)
(1K6 - 27K)
FA8325
(1R0 - 9R1)
(1K - 22K)
FA8225
(10R - 1K0)
FA8425
(R15 - R91)
FA8025
FUSING:
After fusing the final
resistance value will be >50
times the initial value.
30
20
Fusing Time (seconds)
10
5
2
1
0
0
4
8
12
16
20
24
28
32
36
Initial Power (watts)
PACKAGING:
All resistors are supplied tape packed ready for loading onto automatic sequencing and insertion machines. The
standard taping method and critical dimensions are shown in figure 1. Component wires will not protrude beyond the
outside edge of the tapes. FA8225 resistors can be supplied vertically taped in ammo packs or reels. See figure 2.
FA8325/FA8425 can also be supplied loose packed in plastic bags or boxes.
Standard Quantities Per Package
Type
Code
FA8225
Reel
R
5000
Large Ammo Pack
A
5000
Figure 1.
FA8325
5000
2000
FA8425
1500
1000
6
f1
b
f2
6
c
HOW TO ORDER:
Type
FA8225
FA8325
FA8425
b
2.05 (52)
2.05 (52)
2.64 (67)
c
0.197 (5)
0.197 (5)
0.394 (10)
Specify type, reference etc. as indicated in this example of
FA8325 1.1K ohms 5%, resistor taped and reeled.
FA8325
Type
Value
Tolerance Codes
Packaging Details
1K1
J
R
2
WIREWOUND AND FILM TECHNOLOGIES DIVISION
736 Greenway Road
•
Boone, North Carolina 28607-1860
•
Tel: 828-264-8861
•
Fax: 828-264-8866
•
www.irctt.com
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