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
iNtRodUCtioN
The CFN Series Carbon Film Biased Humidity
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
a specialized tan lacquer. Its processes and
controls ensure the product is impervious to
moisture.
For resistors operated in ambient temperatures above 70°C, power rating must be derated
in accordance with the curve below.
Rated Load (%)
70
100
80
60
40
20
20
40
60
80
100 120 140 160
155 °C
Ambient Temperature (°C)
taBLe 1 teMPeRatURe CoeFFiCieNt
stYLe
Max. VaLUe oF teMP. CoeFFiCieNt PPM/°C
under 100K
Ω
CFN100,CFN200,CFN2WS,CFN3WS ±350
CFN-12, CFN-25, CFN-50,
CFN25S, CFN50S, CFN1WS
+350 / -500
100K
Ω
- 1M
Ω
-500
-700
1M
Ω
- 10M
Ω
-1,500
-1,500
Unit: mm
stYLe
Normal
CFN-12
ød
H
L
øD
CFN-25
CFN-50
CFN100
CFN200
Miniature
CFN25S
CFN50S
CFN1WS
CFN2WS
CFN3WS
diMeNsioN
L
3.4±0.3
6.3±0.5
9.0±0.5
11.5±1.0
15.5±1.0
ød
1.9±0.2
2.4±0.2
3.3±0.3
4.5±0.5
5.0±0.5
H
28±2.0
28±2.0
26±2.0
35±2.0
33±2.0
ød
0.45±0.05
0.55±0.05
0.55±0.05
0.8±0.05
0.8±0.05
diMeNsioNs
41
Note:
eLeCtRiCaL CHaRaCteRistiCs
stYLe
Power Rating at 70°C
Maximum Working Voltage
Maximum Overload Voltage
Voltage Proof
Resistance Range
Operating Temp. Range
Temperature Coefficient
CFN-12
1/6W
150V
300V
300V
CFN25s CFN-25
1/4W
200V
400V
400V
250V
500V
500V
CFN50s
1/2W
300V
600V
350V
700V
CFN-50 CFN1Ws
1W
400V
800V
700V
500V
1,000V
1,000V
CFN100
CFN2Ws
2W
CFN200 CFN3Ws
3W
1
Ω
- 10M
Ω
& 0
Ω
for E24 series value
-55°C to +155°C
see Table 1
Note: Special value is available on request
eNViRoNMeNtaL CHaRaCteRistiCs
PeRFoRMaNCe test
Short Time Overload
Voltage Proof
Temperature Coefficient
Insulation Resistance
Solderability
Solvent Resistance of Marking
Robustness of Terminations
Periodic-pulse Overload
Damp Heat Steady State
Endurance at 70°C
Temperature Cycling
Resistance to Soldering Heat
test MetHod
IEC 60115-1 4.13
IEC 60115-1 4.7
IEC 60115-1 4.8
IEC 60115-1 4.6
IEC 60115-1 4.17
IEC 60115-1 4.30
IEC 60115-1 4.16
IEC 60115-1 4.39
IEC 60115-1 4.24
IEC 60115-1 4.25
IEC 60115-1 4.19
IEC 60115-1 4.18
2.5 times RCWV for 5 Sec.
in V-block for 60 Sec., test voltage by type
-55°C to +155°C
in V-block for 60 Sec.
235±5°C for 3±0.5 Sec.
IPA for 5±0.5 Min. with ultrasonic
Direct load for 10 Sec. in the direction of the terminal leads
4 times RCWV 10,000 cycles (1 Sec. on, 25 Sec. off)
40±2°C, 90-95% RH for 56 days, loaded with 0.1 times RCWV
70±2°C at RCWV for 1,000 Hr. (1.5 Hr. on, 0.5 Hr. off)
-55°C
Room Temp.
+155°C
Room Temp. (5 cycles)
260±3°C for 10±1 Sec., immersed to a point 3±0.5mm from the body
aPPRaise
±0.75%+0.05
Ω
No breakdown or
flashover
By type
>1,000M
95% Min. coverage
No deterioration of
coatings and markings
≥2.5kg (24.5N)
±1.0%+0.05
Ω
±3%+0.05
Ω
±3%+0.05
Ω
±1%+0.05
Ω
±1%+0.05
Ω
Note: Rated Continuous Working Voltage (RCWV) =
Power Rating x Resistance Value
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