MF, MFS, RK
general purpose metal film leaded resistor
EU
features
•
Semi-precision metal film resistors
•
The discharge path resistor is recognized by UL 1676 and
c-UL (CAS-C22.2 No.1-M94). (File No. E159326) (RK only)
•
Meets requirements of MIL-R-22684
•
Suitable for automatic machine insertion
•
MFS two times the power rating of the standard body type
•
Marking: Blue-gray body color with color-coded bands
•
Products with lead-free terminations meet EU RoHS
and China RoHS requirements
dimensions and construction
L
D
Trimming Line
Ceramic Core
d
l
Type
MFS1/4
L (ref.)
.126±.008
(3.2±0.2)
.248±.02
(6.3±0.5)
.248±.02
(6.3±0.5)
.374±.04
(9.5±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)
Dimensions
inches
(mm)
C (max.)
D
d (nom.)
.133
(3.4)
.280
(7.1)
.280
(7.1)
.437
(11.1)
.721
(18.3)
.280
(7.1)
.437
(11.1)
.720
(18.3)
.066
(1.7
+.007
-.004
+0.2
)
-0.1
l
.018
(0.45)
.024
(0.6)
.024
(0.6)
.024
(0.6)
.031
(0.8)
.024
(0.6)
.031
(0.8)
.031
(0.8)
1.50±.118
(38.0±3.0)
0.94 min.
(24.0 min.)
1.50±.118
(38.0±3.0)
1.18±.118
(30.0±3.0)
Marking
Resistive
Film
End
Cap
Lead
Wire
MF1/4
MFS1/2
Insulation Coating
C
.091±.012
(2.3±0.3)
.091±.012
(2.3±0.3)
.138±.016
(3.5±0.4)
.217±.02
(5.5±0.5)
.091±.012
(2.3±0.3)
.138±.016
(3.5±0.4)
.217±.02
(5.5±0.5)
Derating Curve
100
80
% Rated Power
60
40
20
0
-60 -40 -20
-55
Surface Temperature Rise
70
Temperature Rise (°C)
60
50
40
30
20
10
0
0
25
50
75
100
MF1/2
MFS1/2,MF1/4,
MF1/2
(+2%&+5%)
MF1/4
MF1
MFS1/4
MF1/2
MF1
RK1/4
RK1/2
RK1
0
80 100 120 140 160
70
155
Ambient Temperature
(°C)
20
40
60
% Rated Power
ordering information
New Part #
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
Taping and Forming
1/4: T26, T52, VT, VTP,
VTE, MT, M, U,
M10, M25
1/2: T26, T52, VTP,
VTE, M12.5, M15
1: T521
R
Packaging
A: Ammo
R: Reel
R20
Nominal
Resistance
+2%: 2 signifi-
cant 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.
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-96 E-24 E-96
E-24
MFS1/4C
MFS1/4D
MFS1/4L
0.25W
300V
C: ±50
D: ±100
L: ±200
—
—
49.9 - 562k
10 - 1M
—
2.2 - 2.2M
—
250V
300V
-55°C
to
+155°C
1/13/09
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
99
resistors
MF, MFS, RK
resistors
general purpose metal film leaded resistor
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-96 E-24 E-96
E-24
MF1/4C
MF1/4D
MF1/4E
MF1/4L
MFS1/2C
MFS1/2D
MFS1/2L
MF1/2C
MF1/2D
MF1/2E
MF1/2L
MF1C
MF1D
MF1E
RK1/4D
RK1/4L
RK1/4B
RK1/2D
RK1/2L
RK1/2B
RK1BC
RK1/2G*
1W
0.50W
0.50W
500V
700V
1000V
700V
0.25W
500V
1W
700V
0.50W
700V
0.50W
500V
0.25W
500V
C: ±50
D: ±100
E: ±25
L: ±200
C: ±50
D: ±100
L: ±200
C: ±50
D: ±100
E: ±25
L: ±200
C: ±50
D: ±100
E: ±25
D: ±100
L: ±200
B: ±350
D: ±100
L: ±200
B: ±350
B: ±350
G: ±250
47.5- 1.0M
47.5 - 1.5M
10 - 5.05M
10 - 4.99M
10 - 5.11M
47.5 - 2.0M
47.5 - 2.0M
1.0 - 10
1.0 - 6.81M
0.51 - 10Ω
0.33 - 5.6M
30.1 - 750K
24.3Ω- 750K
30.1 - 750K
30.1 - 1.0M
24.3 - 1.0M
30.1 - 1.0M
10- 2.21M
30.1 - 1.0M
10 - 2.21M
1.0 - 3.01M
30.1 - 1.0M
1.0 - 10
0.51 - 10
10 - 2.2M
0.20 - 2.2M
—
—
250V
500V
—
—
—
—
—
10 - 1M
10 - 2.21M
2.2 - 2.2M
—
350V
700V
—
47.5- 1.0M
—
47.5 - 1.5M
—
—
350V
700V
—
—
47.5 - 2.0M
—
—
7.5 - 2.49M
—
10Ω - 5.11M
-55°C
to
+155°C
47.5Ω - 1.0M 47.5 - 2.49M
—
—
—
3.3M - 33M
100k - 33M
—
—
—
3.3M - 33M
100k - 33M
350V
700V
47.5 - 4.64M 47.5 - 5.11M
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
3.09M - 25M
—
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.
Test Method
25°C
Room temperature, +100°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)
1/09/09
RK: ±1%, RK1/2G: ±2.5% RK: ±0.6%, RK1/2G: ±2.5%
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%
No breakdown
Not less than 10,000MΩ
—
—
RK,MF: ±1%; RK1/2G: ±5% MF: ±0.3%; RK: ±0.5%,
RK1/2G: ±1%
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.
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.
100
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
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