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
Dimensions inches (mm)
dimensions and construction Type L (ref.) C (max.) D d (nom.) l*
+.02 +.016
.126 .066
L l
-.008 .133 -.004 .018
MFS1/4
D Trimming Line Ceramic Core
+0.5 +0.4
(3.4) (0.45)
(3.2 ) (1.7 )
-0.2 -0.1
d
.248.02 .280 .091.012 .024 1.10.118
MF1/4
(6.30.5) (7.1) (2.30.3) (0.6) (28.03.0)
.248.02 .280 .091.012 .024
MFS1/2
Marking Resistive End Lead (6.30.5) (7.1) (2.30.3) (0.6)
Film Cap Wire
+.016 +.012
.138 1.10
Insulation Coating
MF1/2C .354.04 .437 -.02 .024 -.016
C
+0.4 +3.0
MF1/2D (9.01.0) (11.1) (0.6)
(3.5 ) (28.0 )
-0.5 -4.0
.354.04 .437 .138.016 .024/.031 1.10.118
MF1/2L
(9.01.0) (11.1) (3.50.4) (0.6)/(0.8) (28.03.0)
Derating Curve Surface Temperature Rise
+.012
MFS1/2
100 70 1.50
-.016
.610.02 .721 .217.02 .031
60 MF1/2 MF1
+3.0
80 (15.50.5) (18.3) (5.50.5) (0.8)
MF1
(38.0 )
50 MFS1/4 -5.0
60
40
.248.02 .280 .091.012 .024
MF1/4
RK1/4
30
(6.30.5) (7.1) (2.30.3) (0.6)
40
0.94 min.
20
(24.0 min.)
.374.04 .437 .138.016 .024
20
RK1/2
10
(9.51.0) (11.1) (3.50.4) (0.6)
0 0
-60 -40 -200420060 80 100 120 140 160 025 50 75 100
-55 70 155 .610.04 .720 .217.02 .031 1.50.118
RK1
Ambient Temperature % Rated Power
(15.51.0) (18.3) (5.50.5) (0.8) (38.03.0)
(C)
* Lead length changes depending on taping and forming.
ordering information
MF 1/4 L C T52 8 R R20 J
Power Termination Taping and Lead Nominal
Type T.C.R. Packaging Tolerance
Rating Material Forming Diameter Resistance
MF 1/4: 0.25W E: 25 C: SnCu 1/4: T26, T52, VT, MF1/2L: T52 A: Ammo +2%: 2 significant B: 0.1%
VTP, VTE, MT, figures + 1 multiplier
MFS 1/2: 0.50W C: 50 & Bulk Only: R: Reel C: 0.25%
M, U, M10,
+0.5%,+1%:
RK 1: 1W D: 100 6: 0.6mm D: 0.5%
M12.5
3 significant figures
L: 200 8: 0.8mm F: 1%
1/2: T26, T52, + 1 multiplier
G:250 Blank: All G:2%
VTP, VTE,
R indicates
For further information on
others sizes
B: 350 M12.5, M15 J: 5%
decimal on value
packaging, please refer to
& packaging
1: T521 <100
Appendix C.
applications and ratings
Minimum Absolute Absolute
Resistance Range ( )
Power Operating
Part Dielectric T.C.R. Maximum Maximum
Rating Temperature
Designation Withstanding (ppm/C) Working Overload
(B0.1%) (C0.25%) (D0.5%) (F1.0%) (G2.0%) (J5.0%)
@ 70C Range
Voltage Voltage Voltage
E-96 E-96 E-24 E-192 E-24 E-96 E-24 E-24
-55C
MFS1/4C C: 50
49.9 -
to
0.25W 300V 10 - 1M 250V 500V
562k
MFS1/4D D: 100
+155C
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 11/27/18
KOA Speer Electronics, Inc. 199 Bolivar Drive Bradford, PA 16701 USA 814-362-5536 Fax: 814-362-8883 www.koaspeer.com 163
% Rated Power
Temperature Rise (C)
leaded
resistorsleaded
resistors
MF, MFS, RK
general purpose metal film leaded resistor
applications and ratings (continued)
Minimum Absolute Absolute
Resistance Range ( )
Power Operating
Part Dielectric T.C.R. Maximum Maximum
Rating Temperature
Designation Withstanding (ppm/C) (B0.1%) (C0.25%) (D0.5%) (F1.0%) (G2.0%) (J5.0%) Working Overload
@ 70C Range
Voltage E-96 E-96 E-24 E-192 E-24 E-96 E-24 E-24 Voltage Voltage
MF1/4C C: 50
10- 2.21M 10 - 2.21M
MF1/4D
0.25W 500V D: 100 250V 500V
1.0 - 10 0.51 - 10
MF1/4L L: 200
MFS1/2C C: 50
10 - 1M 10 - 2.21M 10 - 2.2M
0.50W 500V 350V 700V
MFS1/2D D: 100
10 - 4.99M
MF1/2C C: 50
10 - 5.05M
10 - 5.11M
MF1/2D 0.50W 700V D: 100 350V 700V
1.0 - 10 0.51 - 10
MF1/2L L: 200
-55C
47.5 - 1.0M 47.5 - 2.49M
MF1C C: 50
to
10 - 5.11M 1.0 - 6.81M
+155C
MF1D
1W 700V D: 100 350V 700V
47.5 - 1.0M 47.5 - 2.49M 47.5 - 4.64M 47.5 - 5.11M
MF1E E: 25
3.09M - 25M
RK1/4D D: 100
RK1/4L 0.25W 500V L: 200 3.3M - 33M 3.3M - 33M 500V 700V
100k - 25M
RK1/4B B: 350 100k - 33M 100k - 33M
5.11M - 33M
RK1/2D D: 100
RK1/2L
0.50W 700V L: 200 6.2M - 33M 6.2M - 33M 700V 1000V
100k - 35M
100k - 51M 100k - 51M
RK1/2B B: 350
100k - 100M 100k - 100M
100k - 51M
RK1BC 1W 1000V B: 350 1000V 1500V
RK1/2G* 0.50W 700V G: 250 1M - 12M 350V 700V
* Discharge path resistor
environmental applications
Performance Characteristics
Requirement R (% + 0.05 )
Parameter Limit Typical Test Method
Within specified
Resistance 25C
tolerance
Within specified
T.C.R. Room temperature, +100C, RK: +25C/+125C
T.C.R.
RK: 1%, RK1/2G: 2.5% RK: 0.6%, RK1/2G: 1%
Rated voltage x 2.5 or max. overload voltage for 5 seconds, whichever is less;
Overload (Short Time)
MF: 0.5% MF: 0.3%
MFS1/2: Rated voltage x 2 or max. overload voltage for 5 seconds, whichever is less
RK: 1%; RK1/2G: 5%; RK: 0.5%; RK1/2G: 1%
260C 5C, 10 seconds 1 second or
MFS: 0.75%; MF1/4, MFS1/4: 0.4%; MF1/4,
Resistance to Solder Heat
350C 10C, 3.5 seconds 0.5 second
MFS1/2, MF1/2: 0.5%, MFS1/2, MF1/2: 0.25%
Dielectric Withstanding Voltage No breakdown 1 minute
Not less than 10,000M
Insulation Resistance 100V, 1 minute
RK,MF: 1%; MF: 0.3%; RK: 0.5%,
Rapid Change of Temperature -55C (30 minutes), +155C (30 minutes), 5 cycles
RK1/2G: 5% RK1/2G: 1%
RK: 5%; RK1/2G: 10%; RK: 2%; RK1/2G: 5%;
MFS1/4: 1.5%; MF1/4, MFS1/4: 1%; MF1/4,
Moisture Resistance 40C 2C, 90 - 95% RH, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
MFS1/2, MF1/2: 1% MFS1/2, MF1/2: 0.75%
RK: 5%; RK1/2G: 10%; RK: 2%; RK1/2G: 5%;
Endurance at 70C MFS1/4: 1.5%; MF1/4, MFS1/4: 1%; MF1/4, 70C 2C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
MFS1/2, MF1/2: 1% MFS1/2, MF1/2: 0.75%
No abnormality in
appearance. Marking
Resistance to Solvent The resistor shall be immersed for 5 seconds in IPA
shall be easily legible
No such abnormalities
Discharge from 1000pF capacitor 50 pulses. Internal 2.5 seconds.
as short-circuit, burnout,
Impulse
Charge voltage: 1.25kV (RK1/4), 2.5kV (RK1/2) and 6kV (RK1)
breakdown, etc.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 2/20/17
164 KOA Speer Electronics, Inc. 199 Bolivar Drive Bradford, PA 16701 USA 814-362-5536 Fax: 814-362-8883 www.koaspeer.com