MF, MFS, RK
general purpose metal film leaded resistor
EU
features
Semi-precision metal film resistors
Meets requirements of MIL-R-22684
Suitable for automatic machine insertion
MFS two times the power rating of the standard body type
Products with lead-free terminations meet EU RoHS
and China RoHS requirements
•
AEC-Q200 Qualified: MF1/4, MFS1/4, MFS1/2
leaded
resistors
•
•
•
•
•
dimensions and construction
L
D
Trimming Line
Ceramic Core
d
l
Type
MFS1/4
MF1/4
L (ref.)
+.02
.126
-.008
Dimensions
inches
(mm)
C (max.)
D
d (nom.)
.133
(3.4)
.280
(7.1)
.280
(7.1)
.437
(11.1)
.437
(11.1)
.721
(18.3)
.280
(7.1)
.437
(11.1)
.720
(18.3)
.066
(1.7
+.016
-.004
+0.4
)
-0.1
l*
(3.2
+0.5
)
-0.2
.018
(0.45)
.024
(0.6)
.024
(0.6)
.024
(0.6)
.024/.031
(0.6)/(0.8)
.031
(0.8)
.024
(0.6)
.024
(0.6)
.031
(0.8)
1.10
+.012
-.016
+3.0
(28.0
-4.0
)
.248±.02
(6.3±0.5)
.248±.02
(6.3±0.5)
.354±.04
(9.0±1.0)
.354±.04
(9.0±1.0)
.610±.02
(15.5±0.5)
.248±.02
(6.3±0.5)
.374±.04
(9.5±1.0)
.610±.04
(15.5±1.0)
.091±.012
(2.3±0.3)
.091±.012
(2.3±0.3)
.138
(3.5
+.016
-.02
+0.4
)
-0.5
1.10±.118
(28.0±3.0)
Marking
Resistive
Film
End
Cap
Lead
Wire
MFS1/2
MF1/2C
MF1/2D
Insulation Coating
C
Derating Curve
100
80
% Rated Power
60
40
20
0
-60 -40 -20
-55
Surface Temperature Rise
70
Temperature Rise (°C)
MF1/2L
MF1
RK1/4
RK1/2
.138±.016
(3.5±0.4)
.217±.04
(5.5±1.0)
.091±.012
(2.3±0.3)
.138±.016
(3.5±0.4)
.217±.02
(5.5±0.5)
1.10±.118
(28.0±3.0)
1.50
+.012
-.016
+3.0
)
(38.0
-5.0
MFS1/2
MF1/2
MF1
MFS1/4
MF1/4
60
50
40
30
20
10
0
0
25
50
75
0.94 min.
(24.0 min.)
1.50±.118
(38.0±3.0)
0
20 40 60 80 100 120 140 160
155
70
Ambient Temperature
(°C)
100
% Rated Power
RK1
ordering information
MF
Type
MF
MFS
RK
1/4
Power
Rating
1/4: 0.25W
1/2: 0.50W
1: 1W
L
T.C.R.
E: ±25
C: ±50
D: ±100
L: ±200
G: ±250
B: ±350
C
Termination
Material
C: SnCu
T52
* Lead length changes depending on taping and forming.
8
Lead
Diameter
MF1/2L: T52
& Bulk Only:
6: 0.6mm
8: 0.8mm
Blank: All
others sizes
& packaging
R
Packaging
A: Ammo
R: Reel
R20
Nominal
Resistance
+2%: 2 significant
figures + 1 multiplier
+0.5%,+1%:
3 significant figures
+ 1 multiplier
“R” indicates
decimal on value
<100Ω
J
Tolerance
B: ±0.1%
C: ±0.25%
D: ±0.5%
F: ±1%
G: ±2%
J: ±5%
For further information on
packaging, please refer to
Appendix C.
Taping and
Forming
1/4: T26, T52, VT,
VTP, VTE, MT,
M, U, M10,
M12.5
1/2: T26, T52,
VTP, VTE,
M12.5, M15
1: T521
applications and ratings
Minimum
Absolute Absolute
Resistance Range (Ω)
Power
Operating
Part
Dielectric
T.C.R.
Maximum Maximum
Rating
Temperature
Designation
Withstanding (ppm/°C)
(B±0.1%) (C±0.25%) (D±0.5%) (F±1.0%) (G±2.0%) (J±5.0%)
Working Overload
@ 70°C
Range
Voltage
Voltage
Voltage
E-24
E-96
E-96
E-24 E-192 E-24 E-96
E-24
-55°C
MFS1/4C
C: ±50
49.9 -
to
300V
—
—
—
—
0.25W
10 - 1M
250V
500V
562k
MFS1/4D
D: ±100
+155°C
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
12/19/19
144
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
MF, MFS, RK
general purpose metal film leaded resistor
applications and ratings
(continued)
Minimum
Absolute Absolute
Resistance Range (Ω)
Power
Operating
Part
Dielectric
T.C.R.
Maximum Maximum
Rating
Temperature
Designation
Withstanding (ppm/°C)
(B±0.1%) (C±0.25%) (D±0.5%) (F±1.0%) (G±2.0%) (J±5.0%)
Working Overload
@ 70°C
Range
Voltage
Voltage
Voltage
E-24
E-96
E-24
E-96
E-24 E-192 E-24 E-96
MF1/4C
MF1/4D
MF1/4L
MFS1/2C
MFS1/2D
MF1/2C
MF1/2D
MF1/2L
MF1C
MF1D
MF1E
RK1/4D
RK1/4L
RK1/4B
RK1/2D
RK1/2L
RK1/2B
RK1BC
RK1/2G*
1W
0.50W
1000V
700V
0.50W
700V
0.25W
500V
1W
700V
0.50W
700V
0.50W
500V
0.25W
500V
C: ±50
D: ±100
L: ±200
C: ±50
D: ±100
C: ±50
D: ±100
L: ±200
C: ±50
D: ±100
E: ±25
D: ±100
L: ±200
B: ±350
D: ±100
L: ±200
B: ±350
B: ±350
G: ±250
—
—
—
—
—
—
—
5.1 - 2.0M
—
—
—
—
—
—
—
5.1 - 2.49M
5.1 - 5.11M
1.0 - 6.81M
1.0 - 5.11M
3.09M - 25M
10- 2.21M
10 - 2.21M
1.0 - 10
10 - 2.21M
10 - 4.99M
10 - 5.05M
10 - 5.11M
—
0.51 - 10
10 - 2.2M
—
250V
500V
—
10 - 1M
—
350V
700V
leaded
resistors
—
0.51 - 10Ω
—
350V
700V
-55°C
to
+155°C
—
1.0 - 10
—
5.1 - 2.0M
—
5.1 - 2.49M
5.1 - 4.64M
—
—
—
3.3M - 33M
100k - 33M
—
—
—
3.3M - 33M
100k - 33M
350V
700V
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
100k - 25M
5.11M - 33M
500V
700V
—
6.2M - 33M
100k - 51M
—
6.2M - 33M
100k - 51M
—
100k - 35M
100k - 51M
700V
1000V
100k - 100M 100k - 100M
1000V
350V
1500V
700V
—
—
1M - 12M
* Discharge path resistor
environmental applications
Performance Characteristics
Parameter
Resistance
T.C.R.
Overload (Short Time)
Resistance to Solder Heat
Dielectric Withstanding Voltage
Insulation Resistance
Rapid Change of Temperature
Moisture Resistance
Endurance at 70°C
Resistance to Solvent
Impulse
Requirement
∆
R ±(% + 0.05Ω)
Limit
Typical
Within specified
—
tolerance
Within specified
—
T.C.R.
RK: ±1%, RK1/2G: ±2.5% RK: ±0.6%, RK1/2G: ±1%
MF: ±0.5%
MF: ±0.3%
RK: ±1%; RK1/2G: ±5%; RK: ±0.5%; RK1/2G: ±1%
MFS: ±0.75%; MF1/4,
MFS1/4: ±0.4%; MF1/4,
MFS1/2, MF1/2: ±0.5%, MFS1/2, MF1/2: ±0.25%
Test Method
25°C
Room temperature, +100°C, RK: +25°C/+125°C
Rated voltage x 2.5 or max. overload voltage for 5 seconds, whichever is less;
MFS1/2: Rated voltage x 2 or max. overload voltage for 5 seconds, whichever is less
260°C ± 5°C, 10 seconds ± 1 second or
350°C ± 10°C, 3.5 seconds ± 0.5 second
1 minute
100V, 1 minute
-55°C (30 minutes), +155°C (30 minutes), 5 cycles
40°C ± 2°C, 90 - 95% RH, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
70°C ± 2°C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
The resistor shall be immersed for 5 seconds in IPA
Discharge from 1000pF capacitor 50 pulses. Internal 2.5 seconds.
Charge voltage: 1.25kV (RK1/4), 2.5kV (RK1/2) and 6kV (RK1)
No breakdown
Not less than 10,000MΩ
RK,MF: ±1%;
RK1/2G: ±5%
RK: ±5%; RK1/2G: ±10%;
MFS1/4: ±1.5%; MF1/4,
MFS1/2, MF1/2: ±1%
RK: ±5%; RK1/2G: ±10%;
MFS1/4: ±1.5%; MF1/4,
MFS1/2, MF1/2: ±1%
No abnormality in
appearance. Marking
shall be easily legible
No such abnormalities
as short-circuit, burnout,
breakdown, etc.
—
—
MF: ±0.3%; RK: ±0.5%,
RK1/2G: ±1%
RK: ±2%; RK1/2G: ±5%;
MFS1/4: ±1%; MF1/4,
MFS1/2, MF1/2: ±0.75%
RK: ±2%; RK1/2G: ±5%;
MFS1/4: ±1%; MF1/4,
MFS1/2, MF1/2: ±0.75%
—
—
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
12/19/19
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
145
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