Leaded ResistoRs
Metal Film Resistors
Fusible &
Flame-Proof Type
Normal & Miniature Style [ FRM Series ]
FeatURes
Power Rating
Resistance Tolerance
T.C.R.
Flameproof Multi-layer Coating Meets
Flameproof Feature Meets Overload Test
1/4W, 1/2W, 1W, 2W, 3W
±2%, ±5%
±200ppm/°C
UL-94V-0
UL-1412
iNtRodUCtioN
The FRM Series Metal Film Fusible Resistors are
manufactured using vacuum sputtering system
to deposit multiple layers of mixed metals
alloy 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
normal size & pink color lacquer for miniature
size. Overload protection without risk of fire.
Wide range of overload currents.
deRatiNG CURVe
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)
FUsiNG CHaRaCteRistiCs
R<2.0
Ω
Fusing time within 30 seconds at 25 times of rated power
R>2.2
Ω
Fusing time within 30 seconds at 16 times of rated power
Fusing residual resistive value at least 100 times rated resistance
diMeNsioNs
st YLe
Normal
ød
H
L
th color code: white
øD
FRM-25
FRM-50
FRM100
FRM200
Miniature
FRM50S
FRM1WS
FRM2WS
FRM3WS
diMeNsioN
L
6.3±0.5
9.0±0.5
11.5±1.0
15.5±1.0
ød
2.4±0.2
3.3±0.3
4.5±0.5
5.0±0.5
H
28±2.0
26±2.0
35±2.0
33±2.0
Unit: mm
ød
0.55±0.05
0.55±0.05
0.8±0.05
0.8±0.05
23
Note:
eLeCtRiCaL CHaRaCteRistiCs
stYLe
Power Rating at 70°C
Maximum Working Voltage
Maximum Overload Voltage
Dielectric Withstanding Voltage
Resistance Range
Operating Temp. Range
Temperature Coefficient
FRM-25
1/4W
200V
400V
250V
FRM50s
1/2W
250V
500V
FRM-50
FRM1Ws
1W
300V
600V
350V
FRM100
FRM2Ws
2W
350V
700V
FRM200
FRM3Ws
3W
4.7
Ω
- 560
Ω
(±2%) for E24 series value & 2.2
Ω
- 560
Ω
(±5%) for E24 series value
-55°C to +155°C
±200ppm/°C
Note: Special value is available on request
eNViRoNMeNtaL CHaRaCteRistiCs
PeRFoRMaNCe test
Short Time Overload
Dielectric Withstanding Voltage
Temperature Coefficient
Insulation Resistance
Solderability
Resistance to Solvent
Terminal Strength
Pulse Overload
Load Life in Humidity
Load Life
Temperature Cycling
Resistance to Soldering Heat
Overload Flame Retardant
test MetHod
JIS-C-5202 5.5
JIS-C-5202 5.7
JIS-C-5202 5.2
JIS-C-5202 5.6
JIS-C-5202 6.5
JIS-C-5202 6.9
JIS-C-5202 6.1
JIS-C-5202 5.8
JIS-C-5202 7.9
JIS-C-5202 7.10
JIS-C-5202 7.4
JIS-C-5202 6.4
JIS-C-5202 7.12
2.5 times RCWV for 5 Sec.
in V-Block for 60 Sec.
-55°C to +155°C
in V-Block
260±5°C for 5±0.5 Sec.
IPA for 1 Min. with ultrasonic
Direct load for 10 Sec. In the direction of the terminal leads
4 times RCWV 10,000 cycles (1 Sec. on, 25 Sec. off)
40±2°C, 90-95% RH at RCWV for 1,000 Hr. (1.5 Hr. on, 0.5 Hr. off)
70°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)
350±10°C for 3±0.5 Sec.
4 times RCWV for 1 Min.
aPPRaise
±2.0%+0.05
Ω
By type
by Type
>100M
Ω
95% Min. coverage
No deterioration of
coatings and markings
≥2.5kg
(24.5N)
±1.0%+0.05
Ω
±5.0%+0.05
Ω
±5.0%+0.05
Ω
±2.0%+0.05
Ω
±1.0%+0.05
Ω
No evidence of flaming
or arcing
Note: Rated Continuous Working Voltage (RCWV) =
Power Rating x Resistance Value
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