LEADED RESISTORS
Metal Film Resistors MFR Type
Normal & Miniature Style [ MFR Series ]
FEATURES
Power Rating 1/6W, 1/4W, 1/2W, 1W, 2W
Resistance Tolerance ±0.1%, ±0.25%, ±0.5%,±1%
T.C.R. ±15ppm/ºC, ±25ppm/ºC, ±50ppm/ºC, ±100ppm/ºC
DIMENSIONS
STYLE DIMENSION
Normal Miniature L øD H ød
MFR-12 MFR25S 3.4±0.3 1.9±0.2 28±2.0 0.5±0.05
MFR-25 MFR50S 6.3±0.5 2.4±0.2 28±2.0 0.6±0.05
MFR-50 MFR1WS 9.0±0.5 3.3±0.3 26±2.0 0.6±0.05
MFR100 MFR2WS 11.5±1.0 4.5±0.5 35±2.0 0.8±0.05
MFR200 - 15.5±1.0 5.0±0.5 33±2.0 0.8±0.05
Unit : mm
INTRODUCTION
The MFR Series Metal Film Resistors are
manufactured using vacuum sputtering system
to deposit multiple layers of mixed metals and
passivative materials onto a carefully treated high
grade ceramic substrate, the resistors are coated
with layers of blue lacquer.
ød
HLøD
DERATING CURVE
Ambient Temperature (ºC)
Rated Load (%)
HOT-SPOT TEMPERATURE
Surface Temp. Rise (ºC)
Applied Load, % of RCWV
MFR2WS
MFR200 MFR1WS
MFR100 MFR50S
MFR-50 MFR25S
MFR-25
MFR-12
0 25 50 75 100
200
150
100
50
Measuring Position
100
80
60
40
20
20 40 60 80 100 120 140 160 180
70ºC
Note :
ELECTRICAL CHARACTERISTICS
STYLE MFR-12 MFR25S MFR-25 MFR50S MFR-50 MFR1WS MFR100 MFR2WS MFR200
Power Rating at 70ºC 1/6W 1/4W 1/2W 1W 2W
Operating Temp. Range -55ºC to +155ºC
Maximum Working Voltage 200V 200V 250V 300V 350V 400V 500V 500V 500V
Maximum Overload Voltage 400V 400V 500V 600V 700V 800V 1000V 1000V 1000V
Dielectric Withstanding Voltage 300V 400V 500V 500V 500V 700V 1000V 1000V 1000V
Value Range ±0.5%, ±1% 10Ω~1MΩ
Value Rang ±0.1%, ±0.25% 100Ω~100KΩ
Temperature Coefcient (by Type) ±15ppm/ºC, ±25ppm/ºC, ±50ppm/ºC, ±100ppm/ºC
* Resistance range for standard resistance, below or over this resistance on request.
ENVIRONMENTAL CHARACTERISTICS
PERFORMANCE TEST TEST METHOD APPRAISE
Short Time Overload JIS-C-5202 5.5 2.5 Times RCWV for 5 Seconds ±(0.25%+0.05Ω)
Dielectric Withstanding Voltage JIS-C-5202 5.7 in V-Block for 60 Seconds by Type
Temperature Coefcient of Resistance JIS-C-5202 5.2 -55ºC to +155ºC by Type
Insulation Resistance JIS-C-5202 5.6 in V-Block >10000MΩ
Solderability JIS-C-5202 6.5 235±5ºC for 5±0.5 Seconds 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 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 10000 Cycles (1 Sec. on , 25 Sec. off) ±(1%+0.05Ω)
Load Life in Humidity JIS-C-5202 7.9 40±2ºC, 90~95% RH at RCWV for 1000 Hrs. ±(1.5%+0.05Ω)
(1.5 Hrs. on , 0.5 Hrs. off )
Load Life JIS-C-5202 7.10 70ºC at RCWV for 1000 Hrs. (1.5 Hrs. on , 0.5 Hrs. off) ±(1.5%+0.05Ω)
Temperature Cycling JIS-C-5202 7.4 -55ºC➞Room Temp.➞+155ºC➞Room Temp. for 5 Cycles ±(0.75%+0.05Ω)
Resistance to Soldering Heat JIS-C-5202 6.4 350ºC±10ºC for 3±0.5 Seconds ±(0.25%+0.05Ω)
* Rated Continuous Working Voltage (RCWV)= Power Rating x Resistance Value