Low Resistance Metal
Low
Resistors
Resistance Metal
Element Resistors
Low
Resistance Metal
Resistance Metal
Element Resistors
Element Resistors
Low Resistance Metal
Element Resistors
LOB Series
Element
resistance values
LOB
LOB Series
Series
Resistors
•
Ultra low
·
·
·
·
·
·
LOB Series
•
(0.005Ω to 0.1Ω)
LOB Series
resistance values
values
Ultra
Ultralowresistance
low
•
Ultralowresistancevalues
Available
•
(0.005Ω to 0.1
Ω)
(0.005 to 0.1 )
in 1, 3 and 5 watt rated packages
(0.005Ω to 0.1
Ω)
Ultra low resistance values to 0.005Ω
Tolerances from ±1% to ±5%
•
Available
3 and 5 watt rated packages
Available in 1,
in 1, 3 and 5 wattratedpackages
Available 1, 3 and 5 wattratedpackages
Available in 1, 3 and 5 watt rated packages
in
f
•
Tolerances rom ±1%
±1%to ±5%
(≤.02µH at 0.5MHz)
•
Tolerancesfrom
to ±5%
Inherently non-inductive
Tolerances from ±1% to ±5%
•
Tolerancesfrom ±1%to ±5%
.02µH at
of
at 0.5MHz)
Inhe
Inhe
non-inductive (
(
≤.02µH
0.5MHz)
•
rently
rentlynon-inductive
Inherently non-inductive (≤.02μH at 0.5MHz)
resistance
•
Low temperature coefficient
Low temperatu coefficient of
of resistance
re
resistance
•
Inherentlynon-inductive
≤.02µH
at 0.5MHz)
r (
Low temperature coefficient of resistance
•
Lowtemperatue coe
life
High stability over
•
High stability
r
over
•
Lowtemperatue coe
life
life of resistance
High stability over life
over
•
Highstability
over
•
Highstability life
Welwyn Components
Welwyn Components
Welwyn Components
All Pb-free parts comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)
Electrical Data
Electrical Data
Electrical Data
Electrical Data
Continuous power dissipation at 25°C in free air
Continuous power dissipation at 25°Cin free air
Overload power for 5 seconds
Continuous power dissipation seconds in free air
Overload power for 5 at 25°C
Maximum working voltage
Overload power for 5 seconds
Maximum working voltage
Operating temperature
Resistance range storage temperature
Maximum
watts
watts
ohms
* Power Dissipation - The
air temperature, velocity of cooling air, thermal resistance
which can be
the temperature of surrounding objects
not exceeding the maximum element
taken
hile
will affect this transfer, this must be
temperature. Ambient
maximum wattage rating depends upon the amount of heat
of heat and
transferred to the surroundings w
this
-55 to 175
must be taken
transfer, this
into account when selecting a resistor.
* 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
this transfer, this must be taken
temperature. Ambient air temperature, velocity of cooling air, thermal resistance of heat and the temperature of surrounding objects will a
into account when selecting a resistor.
* Power Dissipation - The
amount
Maximum working voltage
maximum wattage rating depends upon the
volts
of heat which can be transferred to the surroundings while not exceeding the maximum element
√1xR
√3xR
√5xR
watts
LOB-3
LOB-5
watts
LOB-1
1
3
5
watts
5
15
25
1
3
5
watts
5
15
25
volts
√1xR
√3xR
√5xR
5
15
25
volts
√1xR
√3xR
√5xR
°C
-55 to 175
-55 to 175
-55 to 175
R005 to R100
R005 to R120
R005 to R100175
°C
175
175
LOB-1
LOB-1
1
LOB-3
LOB-3
3
LOB-5
LOB-5
5
°C
Operating
account
Ambient air temperature, velocity of cooling air, thermal resistance of heat and the
to 175
-55
temperature of surrounding ob
175
will a
-55 to
jects
temperature.
when selecting a resistor.
into
temperature
Physical Data
Physical Data
Physical Data
Dimensions (mm)
Dimensions
(mm)
Dimensions (mm)
Type
max.
Type
L
L
max.
LOB-1
9.9±0.3
Type
L
LOB-1
9.9±0. D
3
f min.
d nom.
d nom.
D
D max.
max.
f min.
C
C
3.6±0.2
38.1±3.2 0.813±0.05
3.6±0. f 38.1±3. d
2
2 0.813±0.0C nom
5
33.27
33.27
LOB-3
14.22±0.25
2
5.33±0.25
2
34.93±3.18 0.81±0.05
LOB-1 LOB-3
14.22±0.2 5.33±0.2 34.93±3.1 0.81±0.0 33.27
0.813±0.05 5
38.1±3.
9.9±0.3
3.6±0.
5
5
8
33.27
33.27
LOB-3
14.22±0.25 5.33±0.25 34.93±3.18 0.81±0.05
1.02±0.05
LOB-5
23.37±0.25 8.38±0.25 31.75±3.18
LOB-5
23.37±0.2 8.38±0.2 31.75±3.1 1.02±0.0 33.27
5
5
8
5
42.42
42.42
LOB-5
23.37±0.25 8.38±0.25 31.75±3.18 1.02±0.05
42.42
contact point
contact point
contact point
C
C
C
contact point
contact point
contact point
d
d
D
d
D
L
D
L
f
L
f
f
Description
Construction
Description
Construction
LOBΩ Series
power precision metal element resistors feature
LOBΩ Series resistors feature tinned copper leads
leads welded
Description
Series
power precision metal element resistors feature
Construction
Series resistors feature tinned copper
welded
LOBΩ
LOBΩ
resistance precision metal 0.005
Ω
resistors feature
directly to low
low
tinned copper
coefficient resistance element in
LOB Series power values down to
to 0.005Ω with virtually no
LOB Series
directly
a
to a
temperature coe leads resistance element in
resistors feature
temperature
welded
resistance values down
element with virtually no
inductance. Available in
in 1,
and virtually no
resistance values down to 0.005
Ω
with 5 watt rated axial
axial leaded
to a low temperature coe
resistance leaded in
inductance. Available
1, 3
3 and 5 watt rated
leaded directly a highly automated proprietary process. Theelement resistor
resistor
a highly automated proprietary process. The leaded
packages, these 1, 3 and 5 watt rated axial leaded
inductance. Available in resistors are compatible with automatic
automated then
then encapsulated
leaded resistor
compound.
packages, these resistors are compatible with automatic
a highlyelements areproprietary process.in a moulding compound.
elements are
encapsulated The
in a moulding
insertion equipment.
packages, these resistors are compatible with automatic
elements are then encapsulated in a moulding compound.
insertion equipment.
insertion equipment.
Applications
Applications
Applications
•
Switchmode and linear power supplies.
Switchmode and linear power supplies.
•
•
•
Switchmode and linear power supplies.
•
Automotive current-sensing circuits.
Automotive current-sensing circuits.
Automotive current-sensing circuits.
•
Instrumentation.
Instrumentation.
Instrumentation.
•
•
•
GeneralNote
General
Welwyn Components reserves the right to make changes in product
Note
without notice or liability.
General Note
BI
General
All
General
Note
Components
make
Welwyn’s
in product specification without notice
specification without notice or liability.
Note
the
is subject to
changes
own
to make changes in
accurate at time of
TT Electronics
information
right to
reserves the right
data and is considered
product
or liability.
going to print.
reserves
Welwyn
A subsidiary of
Welwyn Components reserves the right to make changes in product
without notice or liability.
TT electronics plc
TT
information
reserves the
TT Electronics’
Welwyn’s
and is considered
is considered accurate at time of going to print.
roduct specification without
y
All
electronics
information
right to make
own data
in
own data and
accurate at time of going
liabilit .
to print.
All
is
is
subject to
to
is subject
own data and is considered accurate at time
notice or
to print.
to
changes p
A subsidiary of
A subsidiary of
All information subject Welwyn’s
of going
© WelwynComponents
Limited
·
is consideed accurate at time of going
UK
www.ttelectronics.com/resistors
TT electronics plc
All information is subject to TT electonics’ own data and
Bedlington, Northumberland NE22 7AA,
to print.
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r
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© Welwyn
Limited
©
TT Electronics plc
Components
·
Limited
·
Northumberland NE22 7AA,UK
NE22 7AA, UK
Bedlington,
Bedlington, Northumberland
©
WelwynComponents
Issue B · 03.02
Issue B · 03.02
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ronics plc
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11. 11
Technologies IRC Welwyn
Low
Resistance Metal
Low Resistance
Low
Resistance Metal
Metal
Element
Resistors
Element
Resistors
Element Resistors
LOB
LOB
Series
LOB
Series
Series
Welwyn Components
Temperature coefficient of resistance vs
Resistance value
Temperature Coefficient
of resistance (ppm/°C)
400
LOB3
LOB1
Power derating percentage vs
Free air ambient temperature
100
90
80
70
60
50
40
30
20
10
0
0
25
50
75
100
125
150
175
Rated Power (%)
300
200
100
LOB5
0
0
25
50
75
100
Ambient Temp (°C)
Resistance (ohms x 10
-3
)
Test
Load life (2000 hours)
Thermal shock
Vibration
Mechanical shock
Dielectric strength
Insulation resistance
*±0.0005 ohm allowance for test/contact error.
MIL-STD 202
Method 108
Method 107
Method 204
Method 213
Method 301
Method 302
MAX %
∆
R*
±1%
±1%
±0.5%
±0.5%
±0.5%
>10
11
Unit
%
∆R
%
∆R
%
∆R
%
∆R
%
∆R
ohms
Packaging
Resistors are supplied taped and reeled.
Bulk packaging available.
Ordering Procedure
Example: LOB3 at 10 milliohms and 5% tolerance on a reel of 1250 pieces -
LOB3
–
R01J
I
Type
Value (use IEC62 code)
Tolerance (use IEC62 code)
F
H
Note: 1% & 5% preferred
1%
3%
J
5%
Packing
I
Tape
LOB1
LOB3
LOB5
3500/reel
1250/reel
800/reel
Standard
General
Note
General
Note
TT Electronics
reserves the right
make changes in
in product specification without notice or liability.
TT electronics
reserves the right to
to make changes
product specification without notice or liability.
All
information
subject to TT Electronics’ own data and is considered accurate at time of going to print.
All
information is
is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.ttelectronics.com/resistors
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
© TT
electronics plc
Issue B · 03.02
Telephone: +44 (0)
plc
© TT
Electronics
1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
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BI Technologies IRC Welwyn
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