RF
coat-insulated fusing resistors
features
•
Functions as a resistor in normal condition
•
Quick fusing protects circuit from excessive
overload at an abnormal time
•
Flame-retardant coating with non-flammable paint
recognized by UL94 V-0
•
Marking: Blue body color with color code marking
•
Products meet EU RoHS requirements
resistors
EU
dimensions and construction
L
Trimming Line Resistive Film
l
ød
Type
RF16
RF25
Marking
Ceramic Core
RF50
Electrode Lead
Cap
Wire
D
RF1
RF2
Flame Retardant Insulating Coating
C
L
.125±.008
(3.2±0.2)
.248±.020
(6.3±0.5)
.335±.020
(8.5±0.5)
.354±.039
(9.0±1.0)
.610±.039
(15.5±1.0)
Dimensions inches
(mm)
l*
d (Nominal)
C Max.
D
+.010
.134
.461...
.018
−0
(3.4)
(1.7
+.25
)
(0.45)
−0
.280
.091±.012
(7.1)
(2.3±0.3)
.024
(0.6)
1.18±.118
.374
.118±.012
(9.5)
(3.0±0.3)
(30±3)
.437
.138±.020
(11.1)
(3.5±0.5)
.031
(0.8)
.709
.236±.039
(18.0)
(6.0±1.0)
* Lead length changes depending on taping and forming type.
ordering information
RF
25
Power
Rating
16: 0.17W
25: 0.25W
50: 0.5W
1: 1W
2: 2W
C
Terminal
Surface Material
C: SnCu
T52
Taping &
Forming
See table below
A
Packaging
A: Ammo
R: Reel
100
Nominal
Resistance
3 digits
J
Resistance
Tolerance
J: ±5%
Product
Code
ratings
Type
Power
Rating
Resistance
Range
E24
J: ±5%
1.0 - 1k
0.1 - 10k
0.1 - 15k
0.1 - 10k
1.0 - 3k
—
10W
0.1 - 0.18Ω
—
—
—
—
7.5W
0.2 - 0.43Ω
—
30W
0.1 - 0.18Ω
—
—
6.25W
0.47 - 0.91Ω
12.5W
0.1 - 0.43Ω
25W
0.2 - 0.43Ω
—
Fusing Characteristics
Fusing Power
3W
1Ω
-
4.7Ω
—
—
—
36W
1Ω
-
3.6Ω
2.5W
5.1Ω
-
1kΩ
3.75W
1Ω
-
4.7Ω
2.4kΩ
-
10kΩ
7.5W
0.47Ω
-
2Ω
1.1kΩ
-
15kΩ
15W
0.47Ω
-
2Ω
1.1kΩ
-
10kΩ
30W
1.1kΩ
-
3kΩ
—
3W
5.1Ω
-
2.2kΩ
6W
2.2Ω
-
1kΩ
12W
2.2Ω
-
1kΩ
24W
3.9Ω
-
1kΩ
Fusing
Time
60 sec
Max.
T.C.R.
Dielectric
×10
−6
/K
Withstanding
Voltage
RF16C
RF25C
RF50C
RF1C
RF2C
0.17W
0.25W
0.5W
1W
2W
250V
±1000:
R≤4.7Ω
300V
30 sec
Max.
±350:
R≥5.1Ω
350V
600V
Rated Ambient Temperature: +70°C
Operating Temperature Range: −40 – +155°C
Rated voltage =
√Power
Rating×Resistance value
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
12/30/10
152
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
coat-insulated fusing resistors
environmental applications
Derating Curve
100
% Rated Power
80
60
40
20
0
-40 -20
0
20
80 100 120 140 160
70
155
Ambient Temperature
(°C)
40
60
For resistors operated at an ambient temperature of 70°C or above, a power
rating shall be derated in accordance with derating curve on the left.
Performance Characteristics
Test Items
Resistance
T.C.R.
Overload (Short Time)
Resistance to
Soldering Heat
Rapid Change
of Temperature
Moisture Resistance
Endurance at 70°C
Resistance to Solvent
Performance Requirements
∆R±
(% +0.05Ω)
Limit
Typical
Within specified
—
tolerance
Within specified T.C.R.
—
1%
1%
1%
5%
5%
No abnormality in
appearance. Marking
shall be easily legible.
No evidence of flaming
or self-flaming.
0.5%
0.5%
0.5%
2.5%
2.5%
—
Test Methods
25°C
Room temperature +100°C
Rated voltage × 2.5 for 5 seconds
350°C ± 10°C, 3.5s ± 0.5s or 260°C ± 5°C, 10s ± 1s
−40°C (30 min.)/ +85°C (30 min.) 5 cycles
40°C ±2°C, 90% - 95% RH, 1000 hours
1.5h ON / 0.5h OFF cycle
70°C ± 2°C, 1000 hours
1.5h ON / 0.5h OFF cycle
The resistor shall be immersed in IPA for 30 sec.
Flame retardant
Flame test : The test flame shall be applied and removed
for each 15 sec respsctively to repeat the cycle 5 times.
Overload flame retardant: Power corresponding to 2, 4, 8, 16
and 32 times the power rating shall be applied for each 1min.
until disconnection occurs.
Fusing Characteristics
100
60
30
Fusing Time
RF16 10Ω
RF25 10Ω
RF50 10Ω
RF1 10Ω
RF2 10Ω
10
6
3
1
×5
×10
×15 ×20
×5
×10
×15 ×20
×5
×10
×15 ×20
×5
×10
×15 ×20
×5
×10
×15 ×20
Magnification of Power Rating
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
12/30/10
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
153
resistors
RF
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