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
• AEC-Q200 Qualified: MF1/4, MFS1/4, MFS1/2
dimensions and construction
L
l
Dimensions inches (mm)
Trimming Line
Ceramic Core
D
Type
L (ref.)
C (max.)
D
d (nom.)
l*
d
.066 +.007
-.004
.126±.008
(3.2 0.2)
.133
(3.4)
.018
(0.45)
MFS1/4
(1.7 +0.2
)
-0.1
Marking
Resistive
Film
End
Cap
Lead
Wire
.248±.02
.280
.024
.091±.012
MF1/4
MFS1/2
MF1/2
MF1
(6.3 0.5)
(7.1)
(2.3 0.3)
(0.6)
1.10±.118
(28.0 3.0)
Insulation Coating
.248±.02
(6.3 0.5)
.280
(7.1)
.091±.012
(2.3 0.3)
.024
(0.6)
C
.354±0.4
(9.0 1.0)
.437
(11.1)
.138±.016
(3.5 0.4)
.024
(0.6)
Derating Curve
SurfaceTemperature Rise
.610±.02
(15.5 0.5)
.721
(18.3)
.217±.02
(5.5 0.5)
.031
(0.8)
1.50±.118
(38.0 3.0)
MFS1/2
100
70
MF1/2
MF1
60
80
50
40
30
20
10
0
MFS1/4
.248±.02
.280
.091±.012
.024
RK1/4
RK1/2
RK1
60
(6.3 0.5)
(7.1)
(2.3 0.3)
(0.6)
MF1/4
0.94 min.
40
(24.0 min.)
.374±.04
(9.5 1.0)
.437
(11.1)
.138±.016
(3.5 0.4)
.024
(0.6)
20
0
.610±.04
(15.5 1.0)
.720
(18.3)
.217±.02
(5.5 0.5)
.031
(0.8)
1.50±.118
(38.0 3.0)
-60 -40 -20
-55
0
20 40 60 80 100 120 140 160
0
25
50
75
100
70
Ambient Temperature
(°C)
155
% Rated Power
* Lead length changes depending on taping and forming.
ordering information
New Part #
MF
1/4
L
C
T52
R
R20
J
Power
Rating
Termination
Material
Nominal
Resistance
Type
T.C.R.
Taping and Forming
Packaging
Tolerance
MF
MFS
RK
1/4: 0.25W
1/2: 0.50W
1: 1W
E: ±25
C: SnCu
1/4: T26, T52, VT, VTP,
VTE, MT, M, U,
M10, M12.5
A: Ammo
R: Reel
+2%: 2 signifi- B: ±0.1%
cant figures +
1 multiplier
C: ±50
C: ±0.25%
D: ±0.5%
F: ±1%
D: ±100
L: ±200
G:±250
B: ±350
1/2: T26, T52, VTP,
VTE, M12.5, M15
+0.5%,+1%:
3 significant
figures + 1
multiplier
G:±2%
1: T521
For further information on packaging,
please refer to Appendix C.
J: ±5%
“R” indicates
decimal on
value <100Ω
applications and ratings
Minimum
Dielectric
Withstanding (ppm/°C)
Voltage
Absolute Absolute
Maximum Maximum
Working Overload
Resistance Range (Ω)
Power
Rating
@ 70°C
Operating
Temperature
Range
Part
Designation
T.C.R.
(B±0.1%) (C±0.25%) (D±0.5%) (F±1.0%) (G±2.0%) (J±5.0%)
Voltage
Voltage
E-96
E-96
E-24 E-192 E-24 E-96
E-24
E-24
-55°C
to
+155°C
MFS1/4C
MFS1/4D
C: ±50
49.9 -
10 - 1M
562k
0.25W
300V
—
—
—
—
250V
300V
D: ±100
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
109
KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
KOA [ KOA SPEER ELECTRONICS, INC. ]
