Through-hole resistors
Melf Metal Film Resistors
General Type
Normal & Miniature Style [ MMF Series ]
FEATURES
Power Rating
1/6W, 1/4W, 0.4W, 1/2W, 0.6W, 1W
Resistance Tolerance
±0.1%, ±0.25%, ±0.5%, ±1%, ±2%, ±5%
T.C.R.
±15ppm/°C, ±25ppm/°C, ±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 MMF Series Melf Metal Film 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. SMD
enabled structure.
Rated Load (%)
70
155 °C
100
80
60
40
20
20
40
60
80
Ambient Temperature (°C)
100 120 140 160
DIMENSIONS
Unit: mm
STYLE
D
C
L
DIMENSION
Normal
Miniature
L
D
C Min.
MMF-12
MMF25S / MMF204
3.50±0.2
1.40±0.15
0.5
MMF-25
MMF50S / MMF207
5.90±0.2
2.20±0.1
0.5
MMF-50
MMF1WS
8.50±0.2
3.20±0.2
0.5
21
Note:
ELECTRICAL CHARACTERISTICS
STYLE
MMF-12
MMF25S
MMF204
MMF-25
MMF50S
MMF207
MMF-50
MMF1WS
Power Rating at 70°C
1/6W
1/4W
0.4W
1/4W
1/2W
0.6W
1/2W
1W
Maximum Working Voltage
150V
200V
250V
350V
Maximum Overload Voltage
300V
400V
500V
700V
Voltage Proof on Insulation
300V
500V
700V
Resistance Range
0.22Ω-3.9Ω for tol ±5%, E96 series value, 4Ω - 1MΩ for tol ±1% E24 + E96 series value
Operating Temp. Range
-55°C to +155°C
Temperature Coefficient
±50ppm/°C for 4Ω - 1MΩ , ±100ppm/°C for 0.22Ω - 3.9Ω
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)
±0.5%+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
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
±2.0%+0.1Ω
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) ±2.0%+0.1Ω
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
±0.5%+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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