MF Series use nickel-chromium or a similar alloy deposited on a ceramic rod by a vacuum process of evaporation or sputtering. The final resistance value is (most commonly) defined by cutting an insulating path through the film along the length of the rod while keeping it in rotation. The technology is capable of supporting accurate characteristics over a broad resistance range. Types include axial through-hole and metal film fusible for special purpose.
precision,resistor

General Specifications
Precision, Wirewound, Cement Fusible Resistors
STYLE MIL
STYLE
POWER
RATING(W)
DIMENSION (mm) MAX WORKING
VOLTAGE
MAX OVERLOAD
VOLTAGE
RN RNS L D H d ± 0.05 RN RNS RN RNS
MF - 12 RN-50 1/8W 1/4W 3.2± 0.2 1.5 ± 0.2 26 ± 1.0 0.40~0.45 200 150 400 300
MF - 25 RN-55 1/4W 1/2W 6.0 ± 0.3 2.3 ± 0.3 26 ± 1.0 0.40~0.50 250 200 500 400
MF - 50 RN-60 1/2W 1W 9.0 ± 0.5 3.0 ± 0.5 26 ± 1.0 0.50~0.55 350 250 700 500
MF - 100 RN-65 1W 2W 11 ± 1.0 4.0 ± 0.5 35 ± 3.0 0.75~0.80 500 300 1000 600
MF - 200 RN-70 2W 3W 15 ± 1.0 5.0 ± 0.5 35 ± 3.0 0.75~0.80 500 350 1000 700

Resistance Range
STYLE MIL STYLE TOLERANCE TC+15-25PPM TC+50PPM TC+100PPM REMARK
MF-12 RN-50 ±1%
±0.5%
±0.25%
100Ω-100KΩ
100Ω-100KΩ
100Ω-100KΩ
10Ω-1MΩ 10Ω-1MΩ *Standard resistance
is 10Ω-1MΩ,
below or over
this resistance
on request.
MF-25 RN-55 ±1%
±0.5%
±0.25%
±0.1%
51.1Ω-511KΩ
51.1Ω-511KΩ
100Ω-300KΩ
100Ω-300KΩ
10Ω-1MΩ 10Ω-1MΩ
MF-50 RN-60 ±1%
±0.5%
±0.25%
±0.1%
51.1Ω-1KΩ
51.1Ω-1KΩ
100Ω-551KΩ
100Ω-330KΩ
10Ω-1MΩ 10Ω-1MΩ
MF-100 RN-65 ±1%
±0.5%
±0.25%
±0.1%
51.1Ω-1KΩ
51.1Ω-1KΩ
100Ω-551KΩ
100Ω-330KΩ
10Ω-1MΩ 10Ω-1MΩ
MF-200 RN-70 ±1%
±0.5%
±0.25%
±0.1%
51.1Ω-1KΩ
51.1Ω-1KΩ
100Ω-551KΩ
100Ω-330KΩ
10Ω-1MΩ 10Ω-1MΩ

Electrical Performance
REQUIREMENTS CHARACTERISTICS JIS C 5202 MIL-R-10509F
Operating Temp.Range -55°C ~ 155°C    
Temp Coefficient (°C ) ±25 ±50 ±100 5.2 4.6.12
Short Time Overload ±(0.5%%+0.05Ω) 5.5 A 4.6.6
Dielectric Withstanding V ±(0.5%+0.05Ω) 5.7 A 4.6.8
Effect of Soldering ±(0.5%+0.05Ω) 6.4 350°C 3 sec 4.6.10
Temperature Cycling ±(0.5%+0.05Ω) 7.4 4.6.4
Low Temp Operation ±(0.5%+0.05Ω)   4.6.5
Terminal Strength ±(0.5%+0.05Ω) 6.1 4.6.7
Moisture Resistance ±(1%+0.05Ω) 7.9   1,000hr MIL R-22684 4.6.10
Load Life ±(1%+0.05Ω) 7.10   1,000hr 4.6.13
Storage ±(0.2%+0.05Ω) Shelved one year in a room of normal temperature and humidity

How to Order
MF-25 1/4W 100R J TB
Part Number
MF
Rated Power
(W)
Resistance Value
(Ω)
10R 10Ω
100R 100Ω
1K 1KΩ
1M 1MΩ
Resistance Tolerance
(%)
B ±0.10%
C ±0.25%
D ±0.5%
F ±1.0%
Package
P Bulk
TB Taping Box


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