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. EU RoHS regulation is not intended for
Pb-glass contained in electrode, resistor element and glass.
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
Product
Code T.C.R.
(ppm/°C) Resistance
Tolerance
Termination
Surface 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
Electrode
Cap
Resistive
Film
Lead
Terminal
P
H
D
.02
(0.5)
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
.378
(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
Product
Code 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
109
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. 1/30/11
resistors
For 1/4L, only bulk type is available.
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 ∆R ±(% + 0.05Ω) 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
110 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. 12/29/10