Royalohm Carbon film resistor 1.8 MΩ axial lead 0207 0.25 W CFR0W4J0185A50 1 pc(s) CFR0W4J0185A20 Data Sheet

CONFIDENTIAL DOCUMENT

 1. Scope:

                   This specification for approval relates to Carbon Film Fixed Resistors manufactured by  

      ROYALOHM 's specifications.

 2. Type designation:

                  The type designation shall be in the following form :

  (Ex.)

CR

1/4W

J

100KΩ

Type

Power Rating

Resistance

Nominal

Tolerance

Resistance

3. Ratings:

                 Ratings shall be shown in the table 1.

Table 1

Type
Rated Power
Max. Working Voltage
Max. Overload Voltage
Dielectric Withstanding Voltage
Rated Ambient Temp.
Operating Temp.Range.
Resistance Tolerance
Resistance Range

3.1 Power rating:

Resistors shall have a power rating based on continuous full load operation at an 

ambient temperature of 70 ℃. For temperature in excess of 70 ℃ , the load shall be
derated as shown in the figure 1.

3.2 Voltage rating:

Resistors shall have a rated direct-current (DC) continuous working voltage or an approximate

sine-wave root-mean-square (RMS) alternating-current (AC) continuous working voltage at commercial-
line frequency and waveform curresponding to the power rating , as determined from the 
following formula :

RCWV   =

√

P x R

Were : RCWV  =  Rated DC or RMS AC continuous working voltage at commercial-line frequency and 

  waveform  (volt)

    P  =  Power Rating  (watt)
    R  =  Nominal Resistance (ohm)

250 V
500 V

1Ω ~ 10MΩ

± 5 %

500 V

70 ℃

-55℃～+155℃

CR

0.25W  at 70℃

Page 1.

2013/12/13--Version: 1