LEADED RESISTORS
FEATURES
Power Rating 1/4W, 1/2W, 1W, 2W, 3W
Resistance Tolerance ±1%
T.C.R. ±50ppm/°C, ±100ppm/°C
Flameproof Multi-layer Coating Meets UL-94V-0
Flameproof Feature Meets Overload Test UL-1412
DERATING CURVE
For resistors operated in ambient temperatures above 70°C, power rating must be derated
in accordance with the curve below.
Metal Film Resistors
Flame-Proof Type TypeType
Normal & Miniature Style [ FMF Series ]
INTRODUCTION
The FMF Series Flame Proof 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.
ød
H L øD
DIMENSIONS Unit: mm
STYLE 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
Rated Load (%)
Ambient Temperature (°C)
160140120100806040
100
80
60
40
20
20
70 155 °C
Note:
13
Note: Rated Continuous Working Voltage (RCWV) = Power Rating x Resistance Value
ELECTRICAL CHARACTERISTICS
STYLE FMF-25 FMF50S FMF-50 FMF1WS FMF100 FMF2WS FMF200 FMF3WS
Power Rating at 70°C 1/4W 1/2W 1W 2W 3W
Maximum Working Voltage 250V 300V 350V 400V 500V
Maximum Overload Voltage 500V 600V 700V 800V 1,000V
Dielectric Withstanding Voltage 400V 500V 600V 750V
Resistance Range 1 Ω - 10M Ω & 0 Ω for E24 & E96 series value
Operating Temp. Range -55°C to +155°C
Temperature Coefcient ±50ppm/°C, ±100ppm/°C
Note: Special value is available on request
ENVIRONMENTAL CHARACTERISTICS
PERFORMANCE TEST TEST METHOD APPRAISE
Short Time Overload JIS-C-5202 5.5 2.5 times RCWV for 5 Sec. ±0.25%+0.05 Ω
Dielectric Withstanding Voltage JIS-C-5202 5.7 in V-Block for 60 Sec. By type
Temperature Coefcient JIS-C-5202 5.2 -55°C to +155°C By type
Insulation Resistance JIS-C-5202 5.6 in V-Block >1,000M Ω
Solderability JIS-C-5202 6.5 260±5°C for 5±0.5 Sec. 95% Min. coverage
Resistance to Solvent JIS-C-5202 6.9 IPA for 1 Min. with ultrasonic No deterioration of
coatings and markings
Terminal Strength JIS-C-5202 6.1 Direct load for 10 Sec. in the direction of the terminal leads ≥2.5kg (24.5N)
Pulse Overload JIS-C-5202 5.8 4 times RCWV 10,000 cycles (1 Sec. on, 25 Sec. off) ±1.0%+0.05 Ω
Load Life in Humidity JIS-C-5202 7.9 40±2°C, 90-95% RH at RCWV for 1,000 Hr. (1.5 Hr. on, 0.5 Hr. off) ±1.5%+0.05 Ω
Load Life JIS-C-5202 7.10 70°C at RCWV for 1,000 Hr. (1.5 Hr. on, 0.5 Hr. off) ±1.5%+0.05 Ω
Temperature Cycling JIS-C-5202 7.4 -55°C Room Temp. +155°C Room Temp. (5 cycles) ±0.75%+0.05 Ω
Resistance to Soldering Heat JIS-C-5202 6.4 350±10°C for 3±0.5 Sec. ±0.25%+0.05 Ω
Overload Flame Retardant JIS-C-5202 7.12 4 times RCWV for 1 Min. No evidence of aming
or arcing
