Through-hole resistors
Metal Oxide Film Resistors
Flame-Proof Type
Normal & Miniature Style [ RSF Series ]
FEATURES
Power Rating
1/4W, 1/2W, 1W, 2W, 3W, 5W
Resistance Tolerance
±2%, ±5%
T.C.R.
±300ppm/°C
Flameproof Multi-layer Coating Meets
UL-94V-0
Flameproof Feature Meets Overload Test
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. The normal style &
‘RSF-WV’ style of RSF series are coated with
layers of gray flame-proof lacquer, and the
miniature style are coated with layers of pink
colors flame-proof lacquer.
DERATING CURVE
For resistors operated in ambient temperatures above 70°C, power rating must be derated
in accordance with the curve below.
70
Rated Load (%)
155
235°C
100
80
60
40
20
50
100 150 200 250
Ambient Temperature (°C)
DIMENSIONS
Unit: mm
STYLE
ød
H
L
øD
Note: RSF1WS (for MB Type) ød = 0.8±0.05mm
DIMENSION
Normal
Miniature
L
øD
H
ød
RSF-25
RSF50S
6.3±0.5
2.4±0.2
28±2.0
0.55±0.05
RSF-50
RSF1WS
9.0±0.5
3.3±0.3
26±2.0
0.55±0.05
RSF100
RSF2WS
11.5±1.0
4.5±0.5
35±2.0
0.8±0.05
RSF200
RSF3WS
15.5±1.0
5.0±0.5
33±2.0
0.8±0.05
RSF3WM
RSF5SS
17.5±1.0
6.5±1.0
32±2.0
0.8±0.05
RSF300
RSF5WS
24.5±1.0
8.5±1.0
38±2.0
0.8±0.05
RSF500
-
24.5±1.0
8.5±1.0
38±2.0
0.8±0.05
19
ELECTRICAL CHARACTERISTICS
Normal STYLE
STYLE
RSF-25
RSF-50
RSF100
RSF200
RSF3WM
RSF300
RSF500
Power Rating at 70°C
1/4W
1/2W
1W
2W
3W
Maximum Working Voltage
200V
250V
350V
450V
500V
750V
Maximum Overload Voltage
300V
400V
600V
700V
800V
1,000V
Voltage Proof on Insulation
250V
350V
500V
Resistance Range
1Ω - 1MΩ & for E24 series value
Operating Temp. Range
-55°C to +155°C
Temperature Coefficient
±300ppm/°C
5W
MINIATURE STYLE
STYLE
RSF50S
RSF1WS
Power Rating at 70°C
1/2W
Maximum Working Voltage
250V
Maximum Overload Voltage
400V
Voltage Proof on Insulation
350V
Resistance Range
1Ω - 1MΩ & for E24 series value
Operating Temp. Range
-55°C to +155°C
Temperature Coefficient
±300ppm/°C
300V
RSF2WS
RSF3WS
RSF5SS
RSF5WS
2W
3W
5W
5W
350V
350V
500V
700V
800V
900V
600V
400V
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)
±1.0%+0.05Ω for normal style
±2.0%+0.05Ω for miniature style
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)
±2.0%+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
±5.0%+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)
±5.0%+0.05Ω
Temperature Cycling
IEC 60115-1 4.19
-55°C Room Temp. +155°C Room Temp. (5 cycles)
±1.0%+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
±1.0%+0.05Ω
Accidental Overload Test
IEC 60115-1 4.26
4 times RCWV for 1 Min.
No evidence of flaming or arcing
Note: Rated Continuous Working Voltage (RCWV) = Power Rating x Resistance Value or Max. working voltage listed above, whichever less.
Revision: 2020
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