LEADED RESISTORS
FEATURES
Power Rating 1/6W, 1/4W, 1/2W, 1W, 2W, 3W
Resistance Tolerance ±0.5%, ±1%, ±5%
T.C.R. ±15ppm/°C, ±25ppm/°C, ±50ppm/°C, ±100ppm/°C
DERATING CURVE
For resistors operated in ambient temperatures above 70°C, power rating must be derated
in accordance with the curve below.
Rated Load (%)
Ambient Temperature (°C)
160140120100806040
100
80
60
40
20
20
70 155 °C
DIMENSIONS Unit: mm
STYLE DIMENSION
Normal Miniature L øD H ød
MFR-12 MFR25S 3.4±0.3 1.9±0.2 28±2.0 0.45±0.05
MFR-25 MFR50S 6.3±0.5 2.4±0.2 28±2.0 0.55±0.05
MFR-50 MFR1WS 9.0±0.5 3.3±0.3 26±2.0 0.55±0.05
MFR100 MFR2WS 11.5±1.0 4.5±0.5 35±2.0 0.8±0.05
MFR200 MFR3WS 15.5±1.0 5.0±0.5 33±2.0 0.8±0.05
INTRODUCTION
The MFR Series Metal Film Resistors are
manufactured using a vacuum sputtering system
to deposit multiple layers of mixed metal
alloys 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 blue color lacquer.
Metal Film Resistors
General Type
Normal & Miniature Style [ MFR Series ]
ød
H L øD
Note:
5
Note: Rated Continuous Working Voltage (RCWV) = Power Rating x Resistance Value
ELECTRICAL CHARACTERISTICS
STYLE MFR-12 MFR25S MFR-25 MFR50S MFR-50 MFR1WS MFR100 MFR2WS MFR200 MFR3WS
Power Rating at 70°C 1/6W 1/4W 1/2W 1W 2W 3W
Maximum Working Voltage 200V 250V 300V 350V 400V 500V
Maximum Overload Voltage 400V 500V 600V 700V 800V 1,000V
Voltage Proof 300V 400V 500V 700V 1,000V
Resistance Range 1 Ω - 10M Ω & 0 Ω for E24 & E96 series value
Operating Temp. Range -55°C to +155°C
Temperature Coefcient ±15ppm/°C, ±25ppm/°C, ±50ppm/°C, ±100ppm/°C
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. ±0.25%+0.05 Ω
Voltage Proof IEC 60115-1 4.7 in V-block for 60 Sec., test voltage by type By type
Temperature Coefcient IEC 60115-1 4.8 -55°C to +155°C By type
Insulation Resistance IEC 60115-1 4.6 in V-block for 60 Sec. >10,000M Ω
Solderability IEC 60115-1 4.17 235±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) ±1.0%+0.05 Ω
Damp Heat Steady State IEC 60115-1 4.24 40±2°C, 90-95% RH for 56 days, loaded with 0.1 times RCWV ±1.5%+0.05 Ω
Endurance at 70°C IEC 60115-1 4.25 70±2°C at RCWV for 1,000 Hr. (1.5 Hr. on, 0.5 Hr. off) ±1.5%+0.05 Ω
Temperature Cycling IEC 60115-1 4.19 -55°C Room Temp. +155°C Room Temp. (5 cycles) ±0.75%+0.05 Ω
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 ±0.25%+0.05 Ω
