MF
MFS
RK
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
•Marking: Blue-gray body color with color-coded bands
•Products with lead-free terminations meet EU RoHS
and China RoHS requirements
MF, MFS, RK
general purpose metal film leaded resistor
dimensions and construction
Ceramic Core
d
D
Marking Resistive
Film
Insulation Coating
Trimming Line
End
Cap Lead
Wire
L l
C
L (ref.)
MF1/4 .248
(6.3)
.280
(7.1)
.091±.012
(2.3±0.3)
.024±.002
(0.6±0.05)
1.18±.118
(30.0±3.0)
.024±.002
(0.6±0.05)
.138±.016
(3.5±0.4)
.437
(11.1)
.374
(9.5)
MF1/2
Type C (max.) D d l
Dimensions inches (mm)
1/4: T26, T52, VT, VTP,
VTE, MT, M, U,
M10, M25
1/2: T26, T52, VTP,
VTE, M12.5, M15
1: T521
ordering information
+2%: 2 signifi-
cant figures +
1 multiplier
+0.5%,+1%:
3 significant
figures + 1
multiplier
“R” indicates
decimal on
value <100Ω
1/4: 0.25W
1/2: 0.50W
1: 1W
C: SnCu
(Other
termination
styles may be
available, please
contact factory
for options)
B: ±0.1%
C: ±0.25%
D: ±0.5%
F: ±1%
G: ±2%
J: ±5%
MF 1/4 C
Termination
Material
Type Power
Rating
Nominal
Resistance ToleranceTaping and Forming
New Part # T52 R20
A: Ammo
R: Reel
Packaging
R J
For further information on packaging,
please refer to Appendix C.
E: ±25
C: ±50
D: ±100
L: ±200
T.C.R.
L
MFS1/4 .126
(3.2)
.133
(3.4)
.018
(0.45)
.024±.002
(0.6±0.05)
.091±.012
(2.3±0.3)
.280
(7.1)
.248
(6.3)
MFS1/2
.066 +.007
-.004
(1.7 +0.2)
-0.1
.031±.002
(0.8±0.05)
.138±.016
(3.5±0.4)
.437
(11.1)
.374
(9.5)
MF1/2L
.031±.002
(0.8±0.05)
1.50±.126
(38.1±3.2)
.217±.02
(5.5±0.5)
.721
(18.3)
.610
(15.5)
MF1
EU
RK1/4 .248
(6.3)
.280
(7.1)
.091±.012
(2.3±0.3)
.024±.002
(0.6±0.05)
.031±.002
(0.8±0.05)
.138±.016
(3.5±0.4)
.437
(11.1)
.374
(9.5)
RK1/2
1.18±.118
(30.0±3.0)
Absolute
Maximum
Overload
Voltage
Absolute
Maximum
Working
Voltage
Part
Designation
Power
Rating
@ 70°C
applications and ratings
Minimum
Dielectric
Withstanding
Voltage
T.C.R.
(ppm/°C)
Resistance Range (Ω)
(B±0.1%)
E-96
(C±0.25%)
E-96
(D±0.5%)
E-24 E-96
(F±1.0%)
E-24 E-96
Operating
Temperature
Range
(G±2.0%)
E-24
(J±5.0%)
E-24
MFS1/4C
MFS1/4D 0.25W
49.9 - 562k 10 - 1M
*1.02M - 10M
D: ±100
C: ±50
300V ——
——250V 300V
MFS1/4L
2.2 - 2.2M
L: ±200
-55°C
to
+155°C
* Note: MFS1/4, 1.0% Resistance Range: 1.02M-10M is available in C(SnCu) termination material only
99
KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 9/09/08
resistors
100 KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 3/06/07
resistors
MF, MFS, RK
general purpose metal film leaded resistor
Performance Characteristics
Derating Curve Surface Temperature Rise
environmental applications
% Rated Power
100
80
60
40
20
-60 -40 0 40 60 80 100 160
70
20
Ambient Temperature
(∞C)
0
-55
120
155
-20 140
Temperature Rise (∞C)
70
50
40
30
20
0 25 50 75
% Rated Power
0100
10
60
MF1/2
MF1
MFS1/2,MF1/4,
MF1/2 (+2%&+5%)
MFS1/4
MF1/4
Parameter Requirement
Short Time Overload
Temperature Coefficient
Moisture Resistance
Resistance to Solder Heat
Failure Rate
Load Life
Temperature Cycling
Vibration
Terminal Strength
Shock
Voltage Coefficient
Current Noise
Low Temperature Operation
±(0.30% + 0.05Ω)
±200ppm/°C
±1.5%
±(0.20% + 0.05Ω)
<10-5 %/1000 hours
±(0.50% + 0.05Ω)
±(0.20% + 0.05Ω)
5 # Minimum
<20ppm/v
<1.0µv/v/decade
±(0.30% + 0.05Ω)
Absolute
Maximum
Overload
Voltage
Absolute
Maximum
Working
Voltage
Part
Designation
Power
Rating
@ 70°C
applications and ratings
Minimum
Dielectric
Withstanding
Voltage
MF1/4C
MF1/4D
MF1/4E
MF1/2D
MF1/2C
MF1/2E
MF1D
MF1C
MF1E
0.25W
0.50W
1W
24.3Ω- 750K 24.3 - 1.0M 10- 2.21M
30.1 - 1.0M
10 - 5.05M
47.5 - 2.0M
10Ω- 5.11M
47.5 - 4.64M 47.5 - 5.11M
1.0 - 6.81M
47.5 - 2.0M
10 - 4.99M
30.1 - 1.0M
1.0 - 2..21M
30.1 - 750K 30.1 - 1.0M
47.5- 1.0M 47.5 - 1.5M
47.5Ω- 1.0M 47.5 - 2.49M
47.5 - 2.0M 7.5 - 2.49M
— —
— —
E: ±25
D: ±100
C: ±50
E: ±25
C: ±50
D: ±100
E: ±25
C: ±50
D: ±100
700V
500V 250V
350V
500V
700V
T.C.R.
(ppm/°C)
Resistance Range (Ω)
(B±0.1%)
E-96
(C±0.25%)
E-96
(D±0.5%)
E-24 E-96
(F±1.0%)
E-24 E-96
Operating
Temperature
Range
-55°C
to
+155°C
—
—
—
—
(G±2.0%)
E-24
—
—
—
—
(J±5.0%)
E-24
MF1/4L
1.0 - 10
L: ±200
0.20 - 2.2M
30.1 - 750K 30.1 - 1.0M
— — —
47.5- 1.0M 47.5 - 1.5M
MF1/2L —
1.0 - 10
L: ±200
0.33 - 5.6M 0.33 - 5.6M
— —
350V 700V700V
MFS1/2D
MFS1/2C
—
10 - 2.21M
— —
C: ±50
D: ±100
500V
0.50W 350V 700V
——
0.20 - 2.2M
MFS1/2L
2.2 - 2.2M
L: ±200
1.0 - 3.01M
RK1/2D 0.50W
—
—
5.11M - 33M
—
— —
— —
— —
L: ±200
L: ±200
D: ±100 —
3.3M - 33M
—
3.3M - 33M
RK1/4D —
3.09M - 25M
D: ±100 — —
— —
700V 1000V500V
0.25W 500V
—
—
500V 700V
6.2M - 33M 6.2M - 33M
RK1/4L
RK1/2L
