Through-hole resistors
Professional Type
Metal Film Resistors
Miniature Style [ MF0 Series ]
FEATURES
Power Rating
0.4W, 0.6W
Resistance Tolerance
±0.5%, ±1%, ±2%, ±5%,
T.C.R.
±50ppm/°C, ±100ppm/°C
DERATING CURVE
For resistors operated in ambient temperatures above 70°C, power rating must be derated
in accordance with the curve below.
INTRODUCTION
The MF0 Series Metal Film Professional
Resistors are manufactured using a vacuum
sputtering system to deposit multiple layers of
mixed metal alloys and passivative materials
onto a carefully treated high grade ceramic
substrate. 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 blue
color lacquer.
70
Rated Load (%)
155 °C
100
80
60
40
20
20
40
60
80
Ambient Temperature (°C)
100 120 140 160
DIMENSIONS
Unit: mm
ød
H
L
øD
STYLE
DIMENSION
Miniature
L
øD
H
ød
MF0204
3.4±0.3
1.9±0.2
28±2.0
0.45±0.05
MF0207
6.3±0.5
2.4±0.2
28±2.0
0.55±0.05
9
Note:
ELECTRICAL CHARACTERISTICS
STYLE
MF0204
MF0207
Power Rating at 70°C
0.4W
0.6W
Maximum Working Voltage
250V
350V
Maximum Overload Voltage
500V
700V
Voltage Proof on Insulation
300V
500V
Resistance Range
1Ω - 4M7Ω & 0Ω for E24 & E96 series value
Operating Temp. Range
-55°C to +155°C
Temperature Coefficient
±50ppm/°C , ±100ppm/°C
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. (Not more than maximum Overload Voltage)
±0.25%+0.05Ω
Voltage Proof on Insulation
IEC 60115-1 4.7
In V-Block for 60 sec., test voltage as above table
No Breakdown
Temperature Coefficient
IEC 60115-1 4.8
Between -55°C to +155°C
By type
Insulation Resistance
IEC 60115-1 4.6
in V-block for 60 Sec.
>10,000MΩ
Solderability
IEC 60115-1 4.17
245±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%+0.05Ω
Damp Heat Steady State
IEC 60115-1 4.24
40±2°C, 90-95% RH for 56 days, loaded with 0.1 times RCWV
±1.5%+0.05Ω
Endurance at 70°C
IEC 60115-1 4.25
70±2°C at RCWV (or Umax., Whichever less) for 1,000 Hr. (1.5Hr.on, 0.5Hr. Off) ±1.5%+0.05Ω
Temperature Cycling
IEC 60115-1 4.19
-55°C Room Temp. +155°C Room Temp. (5 cycles)
±0.75%+0.05Ω
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
±0.25%+0.05Ω
Note: RCWV(Rated Continuous Working Voltage) = Power Rating x Resistance Value or Max. working voltage listed above, whichever less.
Revision: 2020
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