LEADED RESISTORS
Carbon Film Resistors
Biased Humidity Type
Normal & Miniature Style [ CFN Series ]
FEATURES
Power Rating
Resistance Tolerance
T.C.R.
1/6W, 1/4W, 1/2W, 1W, 2W, 3W
±2%, ±5%
see Table 1
DERATING CURVE
For resistors operated in ambient temperatures above 70°C, power rating must be derated
INTRODUCTION
in accordance with the curve below.
The CFN Series Carbon Film Biased Humidity
Rated Load (%)
100
70
155 °C
Resistors are manufactured by coating a
homogeneous film of pure carbon on high
grade ceramic rods. After a helical groove has
been cut in the resistive layer, tinned connecting
80
60
40
20
leads of electrolytic copper are welded to
the end-caps. The resistors are coated with
20
40
60
80
100 120 140 160
Ambient Temperature (°C)
a specialized tan lacquer. Its processes and
controls ensure the product is impervious to
moisture.
TABLE 1 TEMPERATURE COEFFICIENT
STYLE
MAX. VALUE OF TEMP. COEFFICIENT PPM/°C
under 100K Ω
CFN100,CFN200,CFN2WS,CFN3WS ±350
100K Ω - 1M Ω
-500
1M Ω - 10M Ω
-1,500
CFN-12, CFN-25, CFN-50,
CFN25S, CFN50S, CFN1WS
+350 / -500
-700
-1,500
DIMENSIONS
STYLE
DIMENSION
Unit: mm
Normal
CFN-12
Miniature
CFN25S
L
3.4±0.3
?D
1.9±0.2
H
28±2.0
?d
0.45±0.05
?d
CFN-25
CFN50S
6.3±0.5
2.4±0.2
28±2.0
0.55±0.05
H
L
?D
CFN-50
CFN1WS
9.0±0.5
3.3±0.3
26±2.0
0.55±0.05
CFN100
CFN200
CFN2WS
CFN3WS
11.5±1.0
15.5±1.0
4.5±0.5
5.0±0.5
35±2.0
33±2.0
0.8±0.05
0.8±0.05
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