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DATA SHEET
MELF METAL FILM RESISTORS
General Purpse
MMF Series
±0.1%, ±0.25%, ±0.5%, ±1%, ±2%, ±5%
1/6W to 1W
Product specification – August 13, 2021 V.0
RoHS compliant & Halogen Free
Through Hole Resistors
Melf Metal Film Resistors
Product Specification
ORDERING INFORMATION
Part number of the MELF metal film resistor is identified by the series,
power rating, tolerance, packing, temperature coefficient and resistance
value.
PART NUMBER
APPLICATIONS
MMF
25S
F
R
E
(1)
(2)
(3)
(4)
(5)
All general purpose
applications
(1) SERIES NAME
Power applications
MMF Series
100R
(6)
Energy meter
(2) POWER RATING
FEATURES
AEC-Q200 qualified
MELF, SMD package
-12 = 1/6W
50S = 1/2W
25S = 1/4W
207 = 0.6W
204 = 0.4W
-50 = 1/2W
-25 = 1/4W
1WS = 1W
(3) TOLERANCE
Excellent pulse withstanding
capability
B = ±0.1%
G = ±2%
C = ±0.25%
J = ±5%
Wide resistance range
D = ±0.5%
- = Based on spec.
RoHS compliant and halogen
free
F = ±1%
(4) PACKAGING
R = Reel Pack
(5) TEMPERATURE COEFFICIENT OF RESISTANCE
E=±50ppm/°C
G=±200ppm/°C
F=±100ppm/°C
- = Based on spec.
(6) RESISTANCE VALUE
0.22Ω-1MΩ for E24 & E96 Series value,100Ω-100KΩ for E192 Series value
Example:
1R = 1Ω, 10K = 10,000Ω, 1M = 1,000,000Ω
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Aug. 13, 2021
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8
MMF
Through Hole Resistors
Product Specification
Melf Metal Film Resistors
8
MMF
DIMENSIONS
Unit: mm
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
SUGGESTED PAD LAYOUT
Unit: mm
Normal
Miniature
MMF-12
MMF25S
MMF204
MMF-25
MMF-50
MMF50S
MMF207
Soldering
L Min.
Mode
P
W Min.
Reflow
1.3
1.6 ± 0.1
1.6
Wave
1.5
1.5 ± 0.1
1.8
Reflow
2.0
3.0 ± 0.1
3.0
Wave
2.5
3.0 ± 0.1
3.0
Reflow
2.3
5.5 ± 0.2
4.0
Wave
2.8
5.5 ± 0.2
4.0
MMF1WS
DERATING CURVE
Rated Power (%)
100
80
60
40
20
20
40
70
100
155
Ambient Temperature (°C)
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Through Hole Resistors
Melf Metal Film Resistors
Product Specification
8
MMF
ELECTRICAL CHARACTERISTICS
CHARACTERISTICS
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
200V
250V
250V
250V
350V
350V
Maximum Overload
Voltage
300V
400V
400V
500V
500V
500V
700V
700V
Voltage Proof on
Insulation
300V
300V
300V
500V
500V
500V
700V
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: For resistance value out of above range is by request.
TEST AND REQUIRMENTS
TEST
TEST METHOD
Short Time Overload
IEC 60115-1 4.13
Voltage Proof on
IEC 60115-1 4.7
Insulation
PROCEDURE
APPRAISE
2.5 times RCWV for 5 sec.(Not more
±0.25%+0.05Ω for≤332KΩ
than maximum overload voltage)
±0.5%+0.05Ω for>332KΩ
In V-Block for 60 sec. test voltage as
No Breakdown
above table
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
IEC 60115-1 4.30
IPA for 5±0.5 Min. with ultrasonic
No deterioration of
Marking
coatings and markings
Periodic-pulse Overload
IEC 60115-1 4.39
4 times RCWV 10,000 cycles (1 Sec. on,
±1.0%+0.05Ω
25 Sec.off)
Damp Heat Steady State
Damp Heat Steady State
IEC 60115-1 4.24
IEC 60115-1 4.37
(accelerated mode)
Endurance at 70°C
Temperature Cycling
IEC 60115-1 4.25
IEC 60115-1 4.19
40±2°C,90-95% RH for 56 days, loaded
±1.5%+0.05Ω for≤332KΩ
with 0.1 times RCWV
±2.5%+0.05Ω for>332KΩ
85±2°C,85% RH for 56 days, loaded
±3.0%+0.05Ω for≤332KΩ
with 0.1 times RCWV(no over 100V)
±5.0%+0.05Ω for>332KΩ
70±2°C at RCWV(or Umax., whichever
±0.75%+0.05Ω for≤332KΩ
less) for 1,000 Hr.(1.5 Hr.on,0.5 Hr. off)
±1.0%+0.05Ω for>332KΩ
-55°C
±1.0%+0.05Ω
Room Temp.
+155°C Room Temp.(5 cycles)
Resistance to Soldering
Heat
IEC 60115-1 4.18
260±3°C for 10±1 Sec., immersed to a
±0.5%+0.05Ω
point 3±0.5mm from the body
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Through Hole Resistors
Melf Metal Film Resistors
Endurance at upper
Product Specification
8
MMF
IEC 60115-1 4.25
125±2°C for 1,000 Hr.
±1.0%+0.05Ω
IEC 60115-1 4.25
155±2°C for 1,000 Hr.
±2.0%+0.05Ω
IEC 60115-1 4.23
Dry heat: 125°C for 16 Hr.
±1.0%+0.05Ω
category temperature
Endurance at upper
category temperature
Climatic test
Damp heat: 55°C,95% RH for 24 Hr.
Cold: -55°C for 2 Hr.
Negative air pressure:8.5KPa at
25±10°C for 2 Hr.
Damp heat cyclic: 55°C, 95% RH for 5
days.
DC load: -55°C at RCWV for 1 Min.
125°C at RCWV for 1 Min.
Note:
RCWV (Rated Continuous Working Voltage):
The DC or AC (rms) continuous working voltage corresponding to the rated power is determined by the following
formula:
V=√(P X R)
or max. working voltage whichever is less
Where
V=Continuous rated DC or
AC (rms) working voltage (V)
P=Rated power (W)
R=Resistance value (Ω)
PACKING METHODS
TYPE
Unit: piece
Normal
Miniature
Packaging
Quantity Per Reel
MMF-12
MMF25S
MMF204
7”
3,000
MMF-25
MMF50S
MMF207
7”
2,000
MMF-50
MMF1WS
13”
2,500
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Through Hole Resistors
Melf Metal Film Resistors
Product Specification
8
MMF
MARKING
3-BAND-CODE
±2%, ±5%
COLOR
BLACK
BROWN
RED
ORANGE
YELLOW
GREEN
BLUE
VIOLET
GREY
WHITE
GOLD
SILVER
1st BAND
0
1
2
3
4
5
6
7
8
9
2nd BAND
0
1
2
3
4
5
6
7
8
9
3rd BAND
0
1
2
3
4
5
6
7
8
9
MULTIPLIER
1Ω
10Ω
100Ω
1KΩ
10KΩ
100K
1MΩ
10MΩ
0.001Ω
0.0001Ω
0.1Ω
0.01Ω
±0.1%, ±0.25%, ±0.5%, ±1%
4-BAND-CODE
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Through Hole Resistors
Melf Metal Film Resistors
Product Specification
8
MMF
REVISION HISTORY
REVISION
DATE
CHANGE NOTIFICATION
DESCRIPTION
Version 0
Aug.2, 2021
-
- First issue of this specification
“ Yageo reserves all the rights for revising the content of this datasheet without further notification, as long as
the products itse lf are unchanged. Any product change will be announced by PCN.”
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Through Hole Resistors
Melf Metal Film Resistors
Product Specification
8
MMF
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inaccuracies or incompleteness contained in any product related information, including but not limited to product
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Information provided here is intended to indicate product specifications only. Yageo reserves all the rights for revising this
content without further notification, as long as products are unchanged. Any product change will be announced by PCN.
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