PL
IA
NT
Features
n
Fuses at 120 V or 240 V
n
E24 resistance values
n
RoHS compliant*
n
UL 1412 recognized
n
Coating material meets UL 94V-0
OM
Applications
n
White goods
n
Inverters
n
Lighting
n
Metering
*R
oH
S
C
requirements
LE
AD
F
RE
E
FWxxA Series Fusible Power Resistors
General Introduction
Ro VE LEA
HS RS D
C ION FRE
OM S E
PL AR
IA E
NT
*
The FWxxA Series of axial leaded wirewound resistors is designed to fuse under abnormal conditions such as sudden surges in
voltage or circuit malfunctions. The resistor will fuse upon application of 120 or 240 voltages.
Electrical Characteristics
Agency Recognition
Description
UL 1412
File Number: E349323
Characteristic
Power
Resistance Range
UL 1412 Recognized Resistance Range
Tolerance
Temperature Coefficient
Operating Temperature Range
Maximum Voltage
Fusing Point
Fusing Time
FW Series
1, 2, 3, 5, 7** W
4.7 ohms to 100 ohms (E24 values)
4.7 ohms to 47 ohms
5%
±200 PPM/°C
-55 °C to +155 °C
√P*R
See Fusing Performance Chart
See Fusing Performance Chart
Materials
Resistor ............... Wire wound around a
ceramic core
Lead Wire ........................Tinned copper
Housing .......................... Insulated resin
Coating Material ...........Meets UL 94V-0
requirements
How to Order
Model
FW = Fusible
Wirewound
Rated Power
10 = 1.0 Watts
20 = 2.0 Watts
30 = 3.0 Watts
50 = 5.0 Watts
70 = 7.0 Watts
The resistor will fuse safely if 120 or 240 V is applied. The time to fuse depends on the
resistance value.
** 7 W = 240 Vac only.
FW 10 A 7R50 J A
Product Dimensions
H
L
D
H
DIMENSIONS:
MM
(INCHES)
d
(DIA.)
Model
FW10A (1 W)
FW20A (2 W)
FW30A (3 W)
FW50A (5 W)
FW70A (7 W)
Dimensions
D
(Max.)
5.0
(.197)
6.0
(.236)
6.5
(.256)
7.5
(.295)
9.5
(.374)
L
(Max.)
12
(.472)
12
(.472)
16
(.630)
18
(.709)
26
(1.024)
H
28 ± 3.0
(1.102 ± .118)
28 ± 3.0
(1.102 ± .118)
28 ± 3.0
(1.102 ± .118)
28 ± 3.0
(1.102 ± .118)
38 ± 3.0
(1.496 ± .118)
d
0.55 ± 0.05
(.022 ± .002)
0.65 ± 0.05
(.026 ± .002)
0.75 ± 0.05
(.030 ± .002)
0.75 ± 0.05
10.0 ± 0.5
(.030 ± .002)
0.75 ± 0.05
(.030 ± .002)
Pin Style
A = Axial
Resistance Code
• R<100 ohms:
“R” represents decimal point
(examples: 7R50 = 7.5 ohms)
• R≥100 ohms:
First three digits are significant,
fourth digit represents number of
zeros to follow
(example: 1000 = 100 ohms)
Resistance Tolerance
J = ±5 %
(0.39 ± 0.02)
Packaging
A = Ammo Pack
• 1,000 pcs./box: FW10, FW20, FW30
• 500 pcs./box: FW50, FW70
Popular Values
Resistance Resistance
Value
Code
(Ohms)
Resistance Resistance
Value
Code
(Ohms)
*RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
Specifications are subject to change without notice.
6.0 ± 1.0
63.0 ± 2.0
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device
(0.24 ± 0.04)
(2.5 ± 0.08)
performance may vary over time.
Users should verify actual device performance in their specific applications.
75.0 ± 2.0
(2.95 ± 0.08)
4.7
5.1
5.6
6.2
6.8
4R70
5R10
5R60
6R20
6R80
7.5
8.2
9.1
10.0
7R50
8R20
9R10
10R0
FWxxA Series Fusible Power Resistors
Performance Specifications
Characteristic
Limits
Test Method
(JIS-C-5201 & JIS-C-5202)
4.8 Natural resistance changes per temperature (°C):
R
2
-R
2
x 10
6
(PPM/°C)
R
1
(T
2
-T
1
)
R
1
: Resistance value at room temp. (T
1
)
R
2
: Resistance value at room temp. +100 °C (T
2
)
4.13
Permanent resistance change after the application of a
potential of 2.5 times RCWV for 5 seconds.
4.16
Direct Load:
Resistance to a 2.5 kg direct load for 10 seconds in the
direction of the longitudinal axis of the terminal leads.
Twist Test:
Terminal leads shall be bent through 90 ° at a point of
approximately 6 mm from the body of the resistor and
shall be rotated through 360 ° (about the original axis of
the bent terminal) in alternating directions for a total of
three rotations.
4.18
Permanent resistance change when leads are immersed
to a point 2.0 to 2.5 mm from the body in 260 °C (±5 °C)
solder for 10 (±1) seconds.
4.17
The area covered with a new, smooth, clean, shiny and
continuous surface free from concentrated pinholes.
Test temp. of solder: 245 °C (±3 °C).
Dwell time in solder: 2~3 seconds.
7.9
Resistance change after 1,000 hours (1.5 hours “ON”,
0.5 hours “OFF”) at RCWV in a humidity test chamber
controlled at 40 °C (±2 °C) and 90-95 % relative humidity.
1 W ~ 5 W: Load 120/240 VAC voltage.
7 W: Load 240 VAC voltage.
Resistor must be safely fused.
UL1412,
19.1 A resistor (or a resistor and its mounting if provided),
shall withstand, without breakdown, for a period of not
less than one minute, a 60 Hz potential of 1000 V plus
twice the rated voltage applied between live parts and
dead metal parts, if any.
Temperature Coefficient
±200 PPM/°C max.
Short Time Overload
Resistance change rate is ±5 % max., with
no evidence of mechanical damage.
Terminal Strength
No evidence of mechanical damage.
Resistance to Soldering Heat
Resistance change rate is ±1 % max., with
no evidence of mechanical damage.
95 % coverage minimum
Resistance change rate is ±5 % max., with
no evidence of mechanical damage.
Resistance value shall increase at least
100 times initial value.
No evidence of flashover mechanical
damage, arcing or insulation breakdown.
Solderability
Load Life in Humidity
Safety Fuse
Dielectric Withstanding
Voltage
Typical Part Marking
Color
Black
Brown
Red
Orange
Yellow
Green
Blue
Violet
Grey
White
Gold
Silver
1st Band
0
1
2
3
4
5
6
7
8
9
2nd Band
0
1
2
3
4
5
6
7
8
9
3rd band
0
1
2
3
4
5
6
7
8
9
Multiplier
1 Ω
10 Ω
100 Ω
1 KΩ
10 KΩ
100 KΩ
1 MΩ
10 MΩ
0.1 Ω
0.01 Ω
Tolerance
±1 %
±2 %
±0.5 %
±0.25 %
±0.10 %
±0.05 %
±5 %
±10 %
1st Significant Figure
2nd Significant Figure
3rd Significant Figure
Multiplier
Tolerance
Specifications are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.
Users should verify actual device performance in their specific applications.
Analog electronics
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