Through-hole resistors
Flame-Proof Type
Metal Film Resistors
Normal & Miniature Style [ FMF Series ]
FEATURES
INTRODUCTION
Power Rating
1/4W, 1/2W, 1W, 2W, 3W
Resistance Tolerance
±1%, ±5%
T.C.R.
±50ppm/°C, ±100ppm/°C
Flameproof Multi-layer Coating Meets
UL-94V-0
Flameproof Feature Meets Overload Test
UL-1412
DERATING CURVE
The FMF Series Metal Film Flame-Proof
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 gray
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
155 °C
100
80
60
40
20
20
40
60
80
100 120 140 160
Ambient Temperature (°C)
DIMENSIONS
Unit: mm
STYLE
ød
H
L
øD
DIMENSION
Normal
Miniature
L
øD
H
ød
FMF-25
FMF50S
6.3±0.5
2.4±0.2
28±2.0
0.55±0.05
FMF-50
FMF1WS
9.0±0.5
3.3±0.3
26±2.0
0.55±0.05
FMF100
FMF2WS
11.5±1.0
4.5±0.5
35±2.0
0.8±0.05
FMF200
FMF3WS
15.5±1.0
5.0±0.5
33±2.0
0.8±0.05
11
Note:
ELECTRICAL CHARACTERISTICS
STYLE
FMF-25
FMF50S
FMF-50
FMF1WS
FMF100
Power Rating at 70°C
1/4W
1/2W
Maximum Working Voltage
250V
300V
350V
400V
500V
Maximum Overload Voltage
500V
600V
700V
800V
1,000V
Voltage Proof on Insulation
400V
Resistance Range
1Ω - 4M7Ω & for E24 & E96 series value
Operating Temp. Range
-55°C to +155°C
Temperature Coefficient
±50ppm/°C, ±100ppm/°C
1W
FMF2WS
FMF200
FMF3WS
2W
3W
500V
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.
>1,000MΩ
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
Accidental Overload Test
IEC 60115-1 4.26
4 times RCWV for 1 Min.
No evidence of flaming
or arcing
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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