LEADED RESISTORS
DIMENSIONS Unit: mm
STYLE DIMENSION
Normal 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
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.
TABLE 1 TEMPERATURE COEFFICIENT
STYLE MAX. VALUE OF TEMP. COEFFICIENT PPM/°C
under 100K Ω100K Ω - 1M Ω1M 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
ød
H L øD
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.
General Type
Normal & Miniature Style [ CFR Series ]
Carbon Film Resistors
Rated Load (%)
Ambient Temperature (°C)
160140120100806040
100
80
60
40
20
20
70 155 °C
Note:
31
Note: Rated Continuous Working Voltage (RCWV) = Power Rating x Resistance Value
ELECTRICAL CHARACTERISTICS
STYLE CFR-12 CFR25S CFR-25 CFR50S CFR-50 CFR1WS CFR100 CFR2WS CFR200 CFR3WS
Power Rating at 70°C 1/6W 1/4W 1/2W 1W 2W 3W
Maximum Working Voltage 150V 200V 250V 300V 350V 400V 500V
Maximum Overload Voltage 300V 400V 500V 600V 700V 800V 1,000V
Voltage Proof 300V 400V 500V 700V 1,000V
Resistance Range 1 Ω - 10M Ω & 0 Ω for E24 series value
Operating Temp. Range -55°C to +155°C
Temperature Coefcient see Table 1
Note: Special value is available on request
ENVIRONMENTAL CHARACTERISTICS
PERFORMANCE TEST TEST METHOD APPRAISE
Short Time Overload IEC 60115-1 4.13 2.5 times RCWV for 5 Sec. ±0.75%+0.05 Ω
Voltage Proof IEC 60115-1 4.7 in V-block for 60 Sec., test voltage by type By type
Temperature Coefcient IEC 60115-1 4.8 -55°C to +155°C By type
Insulation Resistance IEC 60115-1 4.6 in V-block for 60 Sec. >1,000M Ω
Solderability IEC 60115-1 4.17 235±5°C for 3±0.5 Sec. 95% Min. coverage
Solvent Resistance of Marking IEC 60115-1 4.30 IPA for 5±0.5 Min. with ultrasonic No deterioration of
coatings and markings
Robustness of Terminations IEC 60115-1 4.16 Direct load for 10 Sec. in the direction of the terminal leads ≥2.5kg (24.5N)
Periodic-pulse Overload IEC 60115-1 4.39 4 times RCWV 10,000 cycles (1 Sec. on, 25 Sec. off) ±1.0%+0.05 Ω
Damp Heat Steady State IEC 60115-1 4.24 40±2°C, 90-95% RH for 56 days, loaded with 0.1 times RCWV ±3.0%+0.05 Ω
Endurance at 70°C IEC 60115-1 4.25 70±2°C at RCWV for 1,000 Hr. (1.5 Hr. on, 0.5 Hr. off) ±3.0%+0.05 Ω
Temperature Cycling IEC 60115-1 4.19 -55°C Room Temp. +155°C Room Temp. (5 cycles) ±1.0%+0.05 Ω
Resistance to Soldering Heat IEC 60115-1 4.18 260±3°C for 10±1 Sec., immersed to a point 3±0.5mm from the body ±1.0%+0.05 Ω