LEADED RESISTORS
DIMENSIONS Unit: mm
ST YLE DIMENSION
Normal Miniature L øD H ød
FRM-25 FRM50S 6.3±0.5 2.4±0.2 28±2.0 0.55±0.05
FRM-50 FRM1WS 9.0±0.5 3.3±0.3 26±2.0 0.55±0.05
FRM100 FRM2WS 11.5±1.0 4.5±0.5 35±2.0 0.8±0.05
FRM200 FRM3WS 15.5±1.0 5.0±0.5 33±2.0 0.8±0.05
FEATURES
Power Rating 1/4W, 1/2W, 1W, 2W, 3W
Resistance Tolerance ±2%, ±5%
T.C.R. ±200ppm/°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.
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
Metal Film Resistors
Fusible &
Flame-Proof Type
Normal & Miniature Style [ FRM Series ]
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 re.
Wide range of overload currents.
5th color code: white
ød
H L øD
Rated Load (%)
Ambient Temperature (°C)
160140120100806040
100
80
60
40
20
20
70 155 °C
Note:
23
Note: Rated Continuous Working Voltage (RCWV) = Power Rating x Resistance Value
ELECTRICAL CHARACTERISTICS
STYLE FRM-25 FRM50S FRM-50 FRM1WS FRM100 FRM2WS FRM200 FRM3WS
Power Rating at 70°C 1/4W 1/2W 1W 2W 3W
Maximum Working Voltage 200V 250V 300V 350V
Maximum Overload Voltage 400V 500V 600V 700V
Dielectric Withstanding Voltage 250V 350V
Resistance Range 4.7 Ω - 560 Ω (±2%) for E24 series value & 2.2 Ω - 560 Ω (±5%) for E24 series value
Operating Temp. Range -55°C to +155°C
Temperature Coefcient ±200ppm/°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. ±2.0%+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 >100M Ω
Solderability JIS-C-5202 6.5 260±5°C for 5±0.5 Sec. 95% Min. coverage
No deterioration of
coatings and markings
Resistance to Solvent JIS-C-5202 6.9 IPA for 1 Min. with ultrasonic
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) ±5.0%+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) ±5.0%+0.05 Ω
Temperature Cycling JIS-C-5202 7.4 -55°C Room Temp. +155°C Room Temp. (5 cycles) ±2.0%+0.05 Ω
Resistance to Soldering Heat JIS-C-5202 6.4 350±10°C for 3±0.5 Sec. ±1.0%+0.05 Ω
Overload Flame Retardant JIS-C-5202 7.12 4 times RCWV for 1 Min. No evidence of aming
or arcing
