Datasheet

CONFIDENTIAL DOCUMENT
1. Scope:
This specification for approval relates to Metal Film Fixed Resistors manufactured by
ROYALOHM 's specifications.
2. Type designation:
The type designation shall be in the following form :
(Ex.) MF 1/4W F 100Ω
Type Power Rating Resistance Nominal
Tolerance Resistance
3. Ratings:
Ratings shall be shown in the table 1.
Table 1
Type
Rated Power at 70℃
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)
1Ω ~ 10MΩ
70 ℃
-55℃～+155℃
MF
250 V
500 V
500 V
± 1%
Part No.: MF0W4FxxxxxA10 Customer: CONRAD
1/4W (0.25W)
Page 1. 2014/01/14--Version: 2