Leaded ResistoRs
Melf Metal Film Resistors
General Type
Normal & Miniature Style [ MMF Series ]
FeatURes
Power Rating
Resistance Tolerance
T.C.R.
1/6W, 1/4W, 0.4W, 1/2W, 0.6W, 1W
±0.1%, ±0.25%, ±0.5%, ±1%, ±2%, ±5%
±15ppm/°C, ±25ppm/°C, ±50ppm/°C, ±100ppm/°C, ±200ppm/°C
deRatiNG CURVe
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. After
a helical groove has been cut in the resistive
layer, SMD enabled structure. The resistors are
coated with layers of blue color lacquer.
For resistors operated in ambient temperatures above 70°C, power rating must be derated
in accordance with the curve below.
Rated Load (%)
70
100
80
60
40
20
20
40
60
80
100 120 140 160
155 °C
Ambient Temperature (°C)
diMeNsioNs
stYLe
D
C
L
Normal
MMF-12
MMF-25
MMF-50
Miniature
MMF25S / MMF204
MMF50S / MMF207
MMF1WS
diMeNsioN
L
3.50±0.2
5.90±0.2
8.50±0.2
d
1.40±0.15
2.20±0.1
3.20±0.2
Unit: mm
C Min.
0.5
0.5
0.5
2
Note:
eLeCtRiCaL CHaRaCteRistiCs
stYLe
Power Rating at 70°C
Maximum Working Voltage
Maximum Overload Voltage
Voltage Proof
Resistance Range
Operating Temp. Range
Temperature Coefficient
MMF-12
1/6W
150V
300V
300V
MMF25s
1/4W
200V
400V
MMF204
0.4W
MMF-25
1/4W
250V
500V
500V
MMF50s
1/2W
MMF207
0.6W
MMF-50
1/2W
350V
700V
700V
MMF1Ws
1W
1
Ω
- 1M
Ω
& 0
Ω
for E24 & E96 series value, 100
Ω
- 100K
Ω
for E192 series value
-55°C to +155°C
±15ppm/°C, ±25ppm/°C, ±50ppm/°C, ±100ppm/°C, ±200ppm/°C
Note: Special value is available on request
eNViRoNMeNtaL CHaRaCteRistiCs
PeRFoRMaNCe test
Short Time Overload
Voltage Proof
Temperature Coefficient
Insulation Resistance
Solderability
Solvent Resistance of Marking
Periodic-pulse Overload
Damp Heat Steady State
Endurance at 70°C
Temperature Cycling
Resistance to Soldering Heat
test MetHod
IEC 60115-1 4.13
IEC 60115-1 4.7
IEC 60115-1 4.8
IEC 60115-1 4.6
IEC 60115-1 4.17
IEC 60115-1 4.30
IEC 60115-1 4.39
IEC 60115-1 4.24
IEC 60115-1 4.25
IEC 60115-1 4.19
IEC 60115-1 4.18
2.5 times RCWV for 5 Sec.
in V-block for 60 Sec., test voltage by type
-55°C to +155°C
in V-block for 60 Sec.
235±5°C for 3±0.5 Sec.
IPA for 5±0.5 Min. with ultrasonic
4 times RCWV 10,000 cycles (1 Sec. on, 25 Sec. off)
40±2°C, 90-95% RH for 56 days, loaded with 0.1 times RCWV
70±2°C at RCWV for 1,000 Hr. (1.5 Hr. on, 0.5 Hr. off)
-55°C
Room Temp.
+155°C
Room Temp. (5 cycles)
260±3°C for 10±1 Sec., immersed to a point 3±0.5mm from the body
aPPRaise
±0.5%+0.05
Ω
By type
By type
>10,000M Ω
95% Min. coverage
No deterioration of
coatings and markings
±1.0%+0.05
Ω
±2.0%+0.1
Ω
±2.0%+0.1
Ω
±0.75%+0.05
Ω
±0.5%+0.05
Ω
Note: Rated Continuous Working Voltage (RCWV) =
Power Rating x Resistance Value
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