Leaded ResistoRs
Carbon Film Resistors
CFR Type
Normal & Miniature Style [ CFR 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 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 resis-
tive layer, tinned connecting leads of electrolytic
copper are welded to the end-caps. The resis-
tors are coated with layers of tan color lacquer.
For resistors operated in ambient temperatures above 70°C, power rating must be derated
in accordance with the curve below.
Rated Load (%)
0
100
80
60
40
20
20
40
60
80
100 120 140 160
1 °C
Ambient Temperature (°C)
taBLe 1 teMPeRatURe CoeFFiCieNt
stYLe
Max. VaLUe oF teMP. CoeFFiCieNt PPM/°C
under 100K
Ω
CFR100, CFR200, CFR2WS, CFR3WS
CFR-12, CFR-25, CFR-50,
CFR25S, CFR50S, CFR1WS
±350
+350 / -500
100K
Ω
- 1M
Ω
-500
-700
1M
Ω
- 10M
Ω
-1,500
-1,500
diMeNsioNs
stYLe
Normal
ød
H
L
øD
CFR-12
CFR-25
CFR-50
CFR100
CFR200
Miniature
CFR25S
CFR50S
CFR1WS
CFR2WS
CFR3WS
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
Unit: mm
ød
0.45±0.05
0.55±0.05
0.55±0.05
0.8±0.05
0.8±0.05
2
Note:
eLeCtRiCaL CHaRaCteRistiCs
stYLe
Power Rating at 70°C
Maximum Working Voltage
Maximum Overload Voltage
Dielectric Withstanding Voltage
Resistance Range
Operating Temp. Range
Temperature Coefficient
CFR-12
1/6W
150V
300V
300V
CFR25s
1/4W
200V
400V
400V
250V
500V
500V
CFR-25
CFR50s
1/2W
300V
600V
350V
700V
CFR-50
CFR1Ws CFR100
1W
400V
800V
700V
500V
1,000V
1,000V
CFR2Ws CFR200
2W
CFR3Ws
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
Dielectric Withstanding Voltage
Temperature Coefficient
Insulation Resistance
Solderability
Resistance to Solvent
Terminal Strength
Pulse Overload
Load Life in Humidity
Load Life
Temperature Cycling
Resistance to Soldering Heat
test MetHod
JIS-C-5202 5.5
JIS-C-5202 5.7
JIS-C-5202 5.2
JIS-C-5202 5.6
JIS-C-5202 6.5
JIS-C-5202 6.9
JIS-C-5202 6.1
JIS-C-5202 5.8
JIS-C-5202 7.9
JIS-C-5202 7.10
JIS-C-5202 7.4
JIS-C-5202 6.4
2.5 times RCWV for 5 Sec.
in V-Block for 60 Sec.
-55°C to +155°C
in V-Block
260±5°C for 5±0.5 Sec.
IPA for 1 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 at RCWV for 1,000 Hr. (1.5 Hr. on, 0.5 Hr. off)
70°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)
350±10°C for 3±0.5 Sec.
Power Rating x Resistance Value
aPPRaise
±0.75%+0.05
Ω
By type
By type
>1,000M
Ω
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) =
PCB Design
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