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
• AEC-Q200 Qualified: MF1/4, MFS1/4, MFS1/2
dimensions and construction
L
Trimming Line
D
l
Ceramic Core
Type
L (ref.)
Dimensions inches (mm)
C (max.)
D
d (nom.)
d
+.007
-.004
+0.2)
-0.1
MFS1/4
Marking
Resistive
Film
MF1/4
Derating Curve
Surface Temperature Rise
70
Temperature Rise (°C)
100
% Rated Power
80
60
40
20
0
-60 -40 -20
-55
0
20 40 60 80 100 120 140 160
70
155
Ambient Temperature
(°C)
MFS1/2
60
MF1/2
MF1
MFS1/4
50
40
.248±.02
(6.3±0.5)
.280
(7.1)
.091±.012
(2.3±0.3)
.024
(0.6)
.248±.02
(6.3±0.5)
.280
(7.1)
.091±.012
(2.3±0.3)
.024
(0.6)
MF1/2
.354±0.4
(9.0±1.0)
.437
(11.1)
.138±.016
(3.5±0.4)
MF1
.610±.02
(15.5±0.5)
.721
(18.3)
.217±.02
(5.5±0.5)
.031
(0.8)
RK1/4
.248±.02
(6.3±0.5)
.280
(7.1)
.091±.012
(2.3±0.3)
.024
(0.6)
.374±.04
(9.5±1.0)
.437
(11.1)
.138±.016
(3.5±0.4)
.024
(0.6)
RK1
.610±.04
(15.5±1.0)
.720
(18.3)
.217±.02
(5.5±0.5)
.031
(0.8)
MF1/4
30
20
10
0
0
25
50
75
100
l*
.024
(0.6)
RK1/2
Lead
Wire
.133
(3.4)
MFS1/2
End
Cap
Insulation Coating
C
.126±.008
(3.2±0.2)
.066
(1.7
.018
(0.45)
1.10±.118
(28.0±3.0)
1.50±.118
(38.0±3.0)
0.94 min.
(24.0 min.)
1.50±.118
(38.0±3.0)
% Rated Power
* Lead length changes depending on taping and forming.
ordering information
New Part #
MF
Type
MF
MFS
RK
1/4
Power
Rating
1/4: 0.25W
1/2: 0.50W
1: 1W
For further information on packaging,
please refer to Appendix C.
L
T.C.R.
E: ±25
C: ±50
D: ±100
L: ±200
G: ±250
B: ±350
applications and ratings
C
Termination
Material
C: SnCu
T52
R
Taping and Forming
Packaging
1/4: T26, T52, VT, VTP,
VTE, MT, M, U,
M10, M12.5
1/2: T26, T52, VTP,
VTE, M12.5, M15
1: T521
A: Ammo
R: Reel
R20
J
Nominal
Resistance
+2%: 2 significant figures +
1 multiplier
+0.5%,+1%:
3 significant
figures + 1
multiplier
“R” indicates
decimal on
value <100Ω
Tolerance
B: ±0.1%
C: ±0.25%
D: ±0.5%
F: ±1%
G: ±2%
J: ±5%
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
0.25W
300V
—
—
10 - 1M
—
—
250V
300V
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.
12/18/12
KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
109
resistors
MF, MFS, RK
