leaded resISTORS
CFR Type
Carbon Film Resistors
Normal & Miniature Style [ CFR Series ]
FEATURES
Power Rating
1/6W, 1/4W, 1/2W, 1W, 2W, 3W
Resistance Tolerance
±2%, ±5%
T.C.R.
see Table 1
DERATING CURVE
For resistors operated in ambient temperatures above 70°C, power rating must be derated
in accordance with the curve below.
INTRODUCTION
The CFR Series Carbon Film 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 leads of electrolytic
copper are welded to the end-caps. The resistors are coated with layers of tan color lacquer.
Rated Load (%)
0
1 °C
100
80
60
40
20
20
40
60
80
100 120 140 160
Ambient Temperature (°C)
TABLE 1 TEMPERATURE COEFFICIENT
STYLE
Max. Value of Temp. Coefficient ppm/°C
under 100K Ω
100K Ω - 1M Ω
1M Ω - 10M Ω
CFR100, CFR200, CFR2WS, CFR3WS
±350
-500
-1,500
CFR-12, CFR-25, CFR-50,
CFR25S, CFR50S, CFR1WS
+350 / -500
-700
-1,500
DIMENSIONS
Unit: mm
STYLE
DIMENSION
Normal
ød
H
L
øD
Miniature
L
øD
H
ød
CFR-12
CFR25S
3.4±0.3
1.9±0.2
28±2.0
0.45±0.05
CFR-25
CFR50S
6.3±0.5
2.4±0.2
28±2.0
0.55±0.05
CFR-50
CFR1WS
9.0±0.5
3.3±0.3
26±2.0
0.55±0.05
CFR100
CFR2WS
11.5±1.0
4.5±0.5
35±2.0
0.8±0.05
CFR200
CFR3WS
15.5±1.0
5.0±0.5
33±2.0
0.8±0.05
