Resistance
Low Resistance
al Element Resistor
Metal Element Resistor
Low Resistance
·
Low TCR
Element Resistor
Metal
over life
·
High stability
LOB Series
es
bility over life
·
Tolerances from ±1% to ±5%
es from ±1% to ±5%
·
values
resistance values (0.005
Ω
to 0.1
Ω)
Ultra low
LOB Series
resistance
Low TCR
(0.005 to 0.1 )
•
Inherently non-inductive (≤.02 μh @ 0.5 MHz)
·
High
( .02 µh @
y non-inductive
stability over life
0.5 MHz)
•
·
Tolerances from ±1%
packages
5W rated packages
Available in 1W, 3W, and
•
in 1W, 3W, and 5W rated
to ±5%
·
Ultra low
free RoHS compliant construction available
•
Lead
resistance values (0.005 to 0.1 )
e RoHS compliant construction available
MHz)
•
Inherently non-inductive ( .02 µh @ 0.5
•
Available in 1W, 3W, and 5W rated packages
•
Lead free RoHS compliant construction available
ION:
DESCRIPTION:
eries power precision metal element resistors feature resistance values down to 0.005 with virtually no inductanc
The LOB
rated axial leaded packages, these resistors are compatible with automatic insertion
1, 3, and 5 watt
Series power precision metal element resistors feature resistance values down to 0.005 with virtually no inductance.
equipment
Available in 1, 3, and 5 watt rated axial leaded packages, these resistors are compatible with automatic insertion equipment.
IONS:
APPLICATIONS:
• Switchmode and linear power supplies
ode and linear power supplies
circuits
• Automotive current-sensing
ve current-sensing circuits
• Instrumentation
ntation
• Regulators
rs
CONSTRUCTION:
The LOB Series resistors feature tinned copper leads welded directly to a low-temperature coefficient resistance element in a
highly automated proprietary process. The leaded resistor elements are then encapsulated in a molding compound.
CTION:
Series resistors feature tinned copper leads welded directly to a low-temperature coefficient resistance element
Specifications
mated proprietary process. The leaded resistor elements are then encapsulated in a molding compound.
Style
Continuous Power Dissipation
@ 25°C in free air (watts)
1
3
Overload Power
for 5 seconds (watts)
5
Maximum Working
Voltage (volts)
1xR
Maximum Storage
Temperature (°C)
175
175
175
fications
LOB-1
Continuous Power Dissipation
LOB-5
5
@ 25°C in free air (watts)
1
LOB-3
Overload Power
25
for 5 seconds (watts)
5
15
Maximum Working
5xR
Voltage (volts)
1xR
3xR
Maximum Storag
Temperature (°C
175
175
*Power Dissipation - The maximum wattage rating depends upon the amount of heat which can be transferred to the surroundings while not exceeding the maximum element temperature. Ambient
air temperature, velocity of cooling air, thermal resistance of heat, and the temperature of surrounding objects will affect this transfer, and must be taken into account when selecting a resistor.
Environmental Testing
3
Test Parameters
Load Life (2,000 hours)
15
Method 108
3xR
MAX % R *
±1%
5
MIL-STD 202
25
5xR
Unit
% R
175
on - The maximum wattage rating depends upon the amount of heat which can be transferred to the surroundings while not exceeding the maximum element temperature.
velocity of cooling air, thermal resistance of heat, and the temperature of surrounding objects will affect this transfer, and must be taken into account when selecting a res
Thermal Shock
Method 107
±1%
% R
onmental Testing
Vibration
Mechanical Shock
Insulation Resistance
(2,000 hours)
Method 204
Method 213
±0.5%
±0.5%
±0.5% @1000 VAC
>10
10
@ 100 VDC
±1%
% R
% R
% R
Ohms
t Parameters
Dielectric Strength
MIL-STD
Method 301
202
Method
Method 108
302
MAX % R *
Unit
% R
% R
A subsidiary of
*±0.0005 ohm allowance for test/contact error.
Shock
General Note
General Note
Method 107
Method 204
±1%
www.bitechnologies.com
±0.5%
TT
information is subject to IRC’s own data and is considered accurate at time of going to print.
without notice or liability.
All
electronics reserves the right to make changes in product specification
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
IRC reserves the right to make changes in product specification without notice or liability.
TT electronics plc
www.irctt.com www.welwyn-tt.com
LOB Series Issue December 2009 Sheet 1 of 3
% R
© TT electronics plc
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
al Shock
Method 213
±0.5%
08.12
% R
Low Resistance
Metal Element Resistor
LOB Series
Low Resistance
Metal Element Resistor
Physical Data
connect
point
C
connect
point
D
d
l
L
Dimensions (Inches (mm))
Style
LOB-1
L
0.390 ± 0.010
(9.9 ± 0.3)
0.560 ± 0.010
(14.224 ± 0.254)
0.920 ± 0.010
(23.368 ± 0.254)
D
0.140 ± 0.008
(3.6 ± 0.2)
0.2100 ± 0.010
(5.334 ± 0.254)
0.330 ± 0.010
(8.382 ± 0.254)
C
1.31
(33.274)
1.31
(33.274)
1.670
(42.418)
l
1.50 ± 0.125
(38.1 ± 3.2)
1.375 ± 0.125
(34.925 ± 3.175)
1.250 ± 0.125
(31.750 ± 3.175)
d
0.0305 ± 0.002
(0.813 ± 0.051)
0.0305 ± 0.002
(0.813 ± 0.051)
0.040 ± 0.002
(1.016 ± 0.051)
LOB-3
LOB-5
Temperature Coefficient of
Resistance vs. Resistance Value
400
Power Derating Percentage vs.
Free Air Ambient Temperature:
100
300
TCR
(ppm/°C)
75
200
50
100
LOB-1
LOB-3
LOB-5
0
25
50
75
100
25
0
0
0
25
50
75
100
125
150
175
Resistance (ohms x 10
-3
)
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
Ambient Temperature (°C)
LOB Series Issue December 2009 Sheet 2 of 3
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
08.12
Low Resistance
Metal Element Resistor
LOB Series
Low Resistance
Metal Element Resistor
Ordering Data
To order, specify style, resistance value, tolerance, and package type as in the
following example:
Sample Part No.
IRC Type
LOB-3
R010
F
LF
LT
LOB-1 (1 watt)
LOB-3 (3 watt)
LOB-5 (5 watt)
Resistance Value
0.005
0.02
0.01
0.025
0.015
0.03
Tolerance
0.04
0.05
0.07
0.08
0.1
J = 5%, H = 3%, F = 1%
Lead-Free RoHS Compliant
Packaging
LT = Lead Tape (preferred)
LOB-1 = 3,500 pcs.
LOB-3 = 1,250 pcs.
LOB-5 = 800 pcs.
BLK = Bulk Pack, 500/box (non-preferred option)
Wire and Film Technologies Division
T
:
F
:
W
:
T
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
08.12
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