Leaded ResistoRs
Metal Oxide Film Resistors
Flame-Proof Type
Normal & Miniature Style [ RSF 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, 5W
±2%, ±5%
±300ppm/°C
UL-94V-0
UL-1412
iNtRodUCtioN
The RSF Series Metal Oxide Film Flame-Proof
Resistors offer excellent performance in
applications where stability and uniformity of
characteristics are desired. They provide lower
cost alternatives to Carbon Composition
Resistors and General Purpose Metal Films.
Metal Oxides also can replace many low power
General Purpose wirewound applications, saving
both money and time, with shorter delivery
cycles. The normal style & the miniature style
of RSF series are coated with layers of gray and
pink colors flame-proof lacquer respectively.
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
50
100 150 200 250
155
235°C
Ambient Temperature (°C)
diMeNsioNs
stYLe
Normal
RSF-25
RSF-50
ød
H
L
øD
RSF100
RSF200
RSF3WM
RSF300
RSF500
Note: RSF1WS (for MB Type) ød = 0.8±0.05mm
Unit: mm
diMeNsioN
Miniature
RSF50S
RSF1WS
RSF2WS
RSF3WS
RSF5SS
RSF5WS
-
L
6.3±0.5
9.0±0.5
11.5±1.0
15.5±1.0
17.5±1.0
24.5±1.0
24.5±1.0
ød
2.4±0.2
3.3±0.3
4.5±0.5
5.0±0.5
6.5±1.0
8.5±1.0
8.5±1.0
H
28±2.0
26±2.0
35±2.0
33±2.0
32±2.0
38±2.0
38±2.0
ød
0.55±0.05
0.55±0.05
0.8±0.05
0.8±0.05
0.8±0.05
0.8±0.05
0.8±0.05
23
eLeCtRiCaL CHaRaCteRistiCs
NoRMaL stYLe
stYLe
Power Rating at 70°C
Maximum Working Voltage
Maximum Overload Voltage
Voltage Proof
Resistance Range
Operating Temp. Range
Temperature Coefficient
RsF-25
1/4W
200V
300V
250V
RsF-50
1/2W
250V
400V
350V
RsF100
1W
350V
600V
500V
RsF200
2W
RsF3WM
3W
450V
700V
600V
500V
800V
700V
RsF300
RsF500
5W
750V
1,000V
750V
1
Ω
- 1M
Ω
& 0
Ω
for E24 series value
-55°C to +235°C
±300ppm/°C
MiNiatURe stYLe
stYLe
Power Rating at 70°C
Maximum Working Voltage
Maximum Overload Voltage
Voltage Proof
Resistance Range
Operating Temp. Range
Temperature Coefficient
RsF50s
1/2W
250V
400V
350V
RsF1Ws
1W
300V
500V
400V
RsF2Ws
2W
350V
600V
500V
RsF3Ws
3W
RsF5ss
5W
500V
800V
700V
700V
900V
700V
RsF5Ws
1
Ω
- 1M
Ω
& 0
Ω
for E24 series value
-55°C to +235°C
±300ppm/°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
Robustness of Terminations
Periodic-pulse Overload
Damp Heat Steady State
Endurance at 70°C
Temperature Cycling
Resistance to Soldering Heat
Accidental Overload Test
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 4.16
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
IEC 60115-1 4.26
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
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 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
4 times RCWV for 1 Min.
aPPRaise
±1.0%+0.05
Ω
for normal style
±2.0%+0.05
Ω
for miniature style
By type
By type
>1,000M
Ω
95% Min. coverage
No deterioration of coatings and
markings
≥2.5kg
(24.5N)
±2.0%+0.05
Ω
±5.0%+0.05
Ω
±5.0%+0.05
Ω
±1.0%+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
