features
•Lead frame construction
•High density assembly and excellent self-standing strength
•Marking: Blue body color with color dot marking
for resistance and tolerance values
•Products with lead-free terminations meet EU RoHS
requirements. Pb located in glass material, electrode
and resistor element is exempt per Annex 1, exemption
5 of EU directive 2005/95/EC
LF,LFF,RK26
radial metal film leaded resistors
T: Taping
(1/8W,
1/4W only)
Blank: Bulk
ordering information - LF, LFF
C: ±50
D: ±100
L: ±200
LF
LFF
1/8: 0.125W
1/4: 0.25W
1/4L: 0.25W
1/2: 0.5W
T: Sn D: ±0.5%
F: ±1%
G: ±2%
J: ±5%
LF C1/4 T
Power
Rating
Type T.C.R.
(ppm/°C) Tolerance
Termination
Material Taping
New Part # T
Ammo
(1/8, 1/4
only)
Packaging
A D
dimensions and construction
h
Ceramic CoreTrimming Line
L
Marking
Insulation
Coating
End
Cap
Resistive
Film
Lead
Frame
P
H
D
.02±.004
(0.5±0.1)
t
L (max.)
LF1/8 .197
(5.0)
.100±.008
(2.54±0.2)
.236±.039
(6.0±1.0)
.217
(5.5)
.197±.039
(5.0±1.0)
.200
(5.08)
.200±.008
(5.08±0.2)
.300±.012
(7.62±0.3)
.100
(2.54)
.098
(2.5)
.295
(7.5)
.285
(7.25)
LF1/4
LF1/4L
LF1/2
LFF1/4
RK26B2E
Type D (max.) PHh (max.)
Dimensions inches (mm)
±2%, ±5%: 2 significant
figures + 1 multiplier
“R” indicates decimal
on value <10Ω
±0.5%, ±1%: 3 significant
figures + 1 multiplier
“R” indicates decimal
on value <100Ω
Nominal
Resistance
1000
.012
(0.3)
.010
(0.25)
t
.413
(9.6)
.200±.012
(5.08±0.3)
.118±.020
(3.0±0.5)
.217±.020
(5.5±0.5)
T: Taping
Blank: Bulk
ordering information - RK26
B: ±350RK26 2E: 0.25W T: Sn F: ±1%
G: ±2%
J: ±5%
RK26 B 2E T
Power
Rating
Type T.C.R.
(ppm/°C) Tolerance
Termination
Material Taping
New Part # T
Ammo
Packaging
A F
±2%, ±5%: 2 significant
figures + 1 multiplier
“R” indicates decimal
on value <10Ω
±0.5%, ±1%: 3 significant
figures + 1 multiplier
“R” indicates decimal
on value <100Ω
Nominal
Resistance
1003
EU
113
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. 11/17/08
resistors
LF,LFF,RK26
radial metal film leaded resistors
Absolute
Maximum
Overload
Voltage
Absolute
Maximum
Working
Voltage
Part
Designation
Operating
Temperature
Range
Rated
Ambient
Temperature
Power
Rating
applications and ratings
T.C.R.
(ppm/°C)
Max.
LF1/8
LF1/4
LF1/4L
LF1/2
LFF1/4
0.125W
0.25W
0.5W
0.25W
45.3 - 562k 4.7 - 1M 1 - 1M
10 - 1M 10 - 1M 1 - 1M
10 - 100k ——
10 - 1M 10 - 1M 1 - 1M
C: ±50
D: ±100
L: ±200
C: ±50
D: ±100
L: ±200
C: ±50
D: ±100
L: ±200
C: ±50
D: ±100
200V 400V
+70°C
250V 500V
350V 700V
250V 500V
-55°C
to
+150°C
D±0.5%
E-96
F±1%
E-24,E-96
J±5%
E-24
Resistance Range (Ω)
Derating Curve
environmental applications
% Rated Power
100
80
60
40
20
-60 -40 0 406080100160
70
20
Ambient Temperature
(°C)
0
-55
120
155
-20 140
150
LFF, RK26
LF
Performance Characteristics
1 - 1M
1 - 1M
10 - 100k
1 - 1M
G±2%
E-24
RK26B2E 0.25W
— 100K - 22M 100K - 33M
B: ±350 500V 700V
100K - 33M
-55°C
to
+155°C
Parameter
Resistance
Rapid Change of Temperature
Within specified tolerance
25°C
Requirement Test Method
Resistance to Solder Heat 260°C ± 5°C, 10 seconds ± 1 second or 350°C ± 10°C, 3.5 seconds ± 0.5 second
LF: ±0.25%, LFF: ±0.5%, RK26: ±1%
40°C ±2°C, 90-95% RH, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
Endurance @ 70°C 70°C ±3°C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
LF: ±1%, LFF: ±2%, RK26: ±5%
Room temperature +100°C
T.C.R.
Overload (Short Time)
LF, LFF: ±0.5%, RK26: ±1%
LF, LFF: ±0.5%
RK26: ±1%
Within specified T.C.R.
Rated voltage x 2.5 or max. overload voltage for 5 seconds, whichever is less
LF: -55°C (30 minutes)/+25°C (10 minutes), +150°C (30 minutes)/+25°C
(10 minutes), 5 cycles; LFF, RK26: -55°C (30 minutes)/+25°C (10 minutes),
+155°C (30 minutes)/+25°C (10 minutes), 5 cycles
LF: ±1%, LFF: ±2%, RK26: ±5%
Moisture Resistance
resistors
114 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. 12/29/08
