Power Metal Film
Resistor
MF-S Series
•
Flameproof protection
•
Small size for power rating
•
Range of 4 sizes: 0.5 watt to 3 watt at 70°C
Solder coated
copper wire
Flameproof protection
Legend mark or color code
depending on size
Electrical Data
IRC
Type
MF1/2S
MF1S
MF2S
MF3S
Power
Rating
@ 70°C
(watts)
0.5
0.1 - 1M
1.0
350
2.0
0.1 - 470K
3.0
<1Ω: 350
≥10Ω:
150
700
150
500
≤1Ω:
5, 10
>1Ω:
1, 2, 5
E24
Preferred
110
-55 to 235
80
60
Resistance
Range
(ohms)
Limiting
Element
Voltage
(volts)
TCR
(ppm/°C)
Isolation
Voltage
(volts)
Resistance
Tolerance
(%)
Standard
Values
Thermal
Impedance
(°C/watt)
140
Operating
Temperature
Range
(°C)
Environmental Data
Characteristic
Loaded at Rated Power: 1000 hrs at 70°C
Shelf Life: 12 months at room temperature
Derating from Rated Power at 70°C
Climatic
Climatic Category
Temperature Rapid Change
Resistance to Solder heat
Maximum
5
1
zero at 155°C
1
40/125/56
0..5
0.5
General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of going to print.
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
A subsidiary of
TT electronics plc
MF-S Series Issue October 2008 Sheet 1 of 3
Power Metal Film
Resistor
Physical Data
d
D
L
f
Dimensions (Inches and (mm)) & Weight (g)
IRC
Type
MF1/2S
MF1S
MF2S
MF3S
L max
0.244
(6.2)
0.354
(9.0)
0.492
(12.5)
0.571
(14.5)
D max
0.090
(2.3)
0.134
(3.4)
0.165
(4.2)
0.201
(5.1)
f min
0.039
(21.0)
0.772
(19.6)
0.700
(17.8)
0.937
(23.8)
d nom
0.024
(0.6)
0.031
(0.8)
0.031
(0.8)
0.031
(0.8)
PCB
Mounting
Centers
0.402
(10.2)
0.500
(12.7)
0.724
(18.4)
0.799
(20.3)
Min Bend
Radius
0.024
(0.6)
0.047
(1.2)
0.047
(1.2)
0.047
(1.2)
Wt. nom
0.3
0.5
0.9
1.1
Construction
The resistance element is a precisely controlled thin film
of metal alloy on a high purity ceramic core, protected
by a cement coating applied so that terminations remain
completely clear.
This permits a well defined body length, (clean lead to
clean lead dimension L).
Terminations
Material
Strength
Solderability
Solder-coated copper wire.
The terminations meet the
requirements of IEC 68.2.21
The terminations meet the
requirements of IEC 115-1,
Clause 4.17.3.2
Marking
MF Series resistors are color coded with 4 bands. IEC 62
colors are used.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
Flammability
The resistors will not burn or emit incandescant particles under
any condition of applied temperature or power overload.
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
MF-S Series Issue October 2008 Sheet 2 of 3
Power Metal Film
Resistor
Application Notes
1. If the resistors are to dissipate full rate power, it
is recommended that the terminations should not be
soldered closer than 4mm from the body.
2. Due to operating temperature limitations imposed
by some pcb materials, derating may be necessary. An
estimate of the temperature rise to be expected can be
calculated using the thermal impedance figures given
under Electrical Data.
3. Lead formed resistors can also be supplied. Standard
options of Lancet, Radial, and Goalpost forming are
shown in lead Form Information section.
Ordering Data
Sample Part No.
IRC Type
Value
MF1/2S, MF1S, MF2S, MF3S
(Use IEC 62 code)
MF2S
6802
J
R
Tolerance
(Use IEC 62 code)
J = 5%, K = 10%
Packaging Details
R = Reel, A = Ammo
Type
MF1/2S
MF1S
MF2S
Code
R
A
A
MF1/2S
5000
5000
2000
MF1S
2500
2500
1000
MF2S
2500
2500
1000
MF3S
1000
N/A
N/A
Packaging
The preferred method of packaging is taped and ammo packed.
See figure 1 for critical dimensions.
Alternative packaging is available by special request.
6
f1
b
6
f2
c
Body location: f1 - f2
≤
1.4mm
Type
MF1/2S
MF1S
MF2S
MF3S
b
52
52
52
67
c
5
5
5
10
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
MF-S Series Issue October 2008 Sheet 2 of 3
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