Low Resistance Metal
Low
Resistors
Resistance Metal
Element Resistors
Low
Resistance Metal
Resistance Metal
Element Resistors
Element Resistors
Element Resistors
Low Resistance Metal
LOB Series
LOB
Element
resistance values
LOB Series
Series
Resistors
•
Ultra low
LOB Series
•
(0.005Ω to 0.1Ω)
·
Ultra
Ultralowresistancevalues
low
LOB Series
resistance values
•
Ultralowresistancevalues
Available
•
(0.005Ω to 0.1
Ω)
(0.005 to 0.1 )
in 1, 3 and 5 watt rated packages
to
3
3
Ultra low resistance values
5 wattratedpackages
•
Availablein 1,
Ω)
5
±1% to ±5%
·
(0.005Ω
in 1,
0.1
from
watt rated packages
Available
•
Tolerances
and
and ratedpackages
•
(0.005Ω to 0.1Ω)
·
Availablein
rom
and 5 wattto ±5%
(≤.02µH at 0.5MHz)
Tolerances
1, 3
±1%
±1%
f
•
Tolerancesfrom
to ±5%
•
Inherently non-inductive
Available in 1, 3 and 5 watt rated packages
•
Inherently
rentlynon-inductive
≤.02µH
·
Tolerancesfrom ±1%to ±5%
.02µH at
of
at 0.5MHz)
0.5MHz)
•
Inhe
non-inductive (
(
Low temperature
resistance
Tolerances from ±1% to ±5%
coefficient
•
temperatu coefficient of
at 0.5MHz)
·
Inherentlynon-inductive
≤.02µH
resistance
re
(
•
Low
Lowtemperatue coe
resistance
r
•
High stability over life
of
Inherently non-inductive (≤.02μH at 0.5MHz)
•
temperatue coe
life
of resistance
·
Low Highstabilityoverlife
•
High stability
r
over
Low temperature coefficient of resistance
•
over
•
Highstability life
High stability over life
Welwyn Components
Welwyn Components
Welwyn Components
All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
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 secondsin free air
Overload power for 5 at 25°C
Maximum working voltage
Overload power for 5 seconds
Maximum working voltage
Operating temperature
Maximum workingstorage temperature
Maximum voltage
watts
watts
volts
LOB-1
LOB-1
watts
1
watts
LOB-1
1
watts
5
1
watts
5
volts
√1xR
5
volts
√1xR
°C
-55 to 175
°C
√1xR
175
LOB-3
LOB-5
LOB-3
LOB-5
3
5
LOB-3
LOB-5
3
5
15
25
3
5
15
25
√3xR
√5xR
15
25
√3xR
√5xR
-55 to 175
-55 to 175
√3xR
√5xR
175
175
temperature. Ambient air temperature, velocity of cooling air, thermal resistance of heat and the temperature of surrounding objects will affect this transfer, this must be taken
this transfer, this must be taken
temperature. Ambient air temperature, velocity of cooling air, thermal resistance of heat and the temperature of surrounding ob
jects will a
into account
maximum wattage rating
* Power Dissipation - The
when selecting a resistor.
depends upon the amount of heat which can be transferred to the surroundings while not exceeding the maximum element
into account when selecting a resistor.
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 maximum wattage rating depends
which can
to
to 175
Operating temperature
The maximum wattage rating depends upon
upon the amount of heat
can
to 175
be transferred
-55
the surroundings
not exceeding the maximum element
element
-55
be transferred to the surroundings w hile
while not exceeding the maximum
-55 to 175
* Power Dissipation -
the amount
°C
heat which
of
Physical Data
Physical Data
Physical Data
Dimensions
Dimensions
(mm)
(mm)
Dimensions
(mm)
Type
max.
Type
L
L
max.
Type
L
LOB-1
LOB-1
contact
contact point
point
D
D max.
max.
f min.
f min.
d nom.
d nom.
C
C
C
C
C
contact point
contact point
contact point
contact point
9.9±0.3
9.9±0. D
3
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
d
D
LOB-1 LOB-3
3
14.22±0.25
5.33±0.2 34.93±3.1 0.81±0.0 33.27
0.813±0.0 5
38.1±3.
9.9±0.
3.6±0.
5
5
8
33.27
33.27
LOB-3
14.22±0.2 2
5.33±0.25
2
34.93±3.18
5
0.81±0.05
LOB-3
14.22±0.2 5.33±0.2
8.38±0.25 31.75±3.18
5
1.02±0.05
8
5
LOB-5
23.37±0.2 8.38±0.2 31.75±3.1 1.02±0.0 33.27
5
5
8
42.42
42.42
LOB-5
23.37±0.25
5 34.93±3.1 0.81±0.0 5
LOB-5
23.37±0.2
5 8.38±0.2 31.75±3.1 1.02±0.0
5
8
42.42
5
d
d
D
L
D
L
f
L
f
f
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
elements are then encapsulated in a moulding compound.
inductance. Available in resistors are compatible with automatic
packages, these resistors are compatible with automatic
a highly automated proprietary process. The leaded resistor
compound.
elements are then encapsulated in a moulding
insertion equipment.
packages, these resistors are compatible with automatic
elements are then encapsulated in a moulding compound.
insertion equipment.
insertion equipment.
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
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
without notice or liability.
General
Welwyn Components reserves the right to make changes in product
Note
General
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
General Note
General
Note
Note
104
A subsidiary of
TT Electronics reserves the right to make changes in
changes
specification without notice
specification without notice or liability.
Welwyn Components reserves the
reserves
make
right to make changes in product
or liability.
or liability.
without notice
Welwyn Components
right to
the
product
in product
TT electronics plc
TT electronics reserves the right to make changes in p
roduct specification without notice or liabilit .
y
A subsidiary of
A subsidiary of
All information is subject to
is subject
own data and
own
considered
is considered
of going to
time
All information
information
TT Electronics’
Limited
and
considered accurate at time
accurate at
print.
of going to print.
All
is subject to
Welwyn’s
to
own data
© WelwynComponents
Welwyn’s
is
is
data and
red accurate
time of going to print.
·
is conside
accurate at
at time of going
UK
All information is subject to TT electonics’ own data and
Bedlington, Northumberland NE22 7AA,
to print.
r
www.ttelectronics.com/resistors
TT electronics plc
TT electronics plc
www.bitechnologies.com ww
w.irctt.com ww
w.welwyn-tt.com
B · 03.02
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Telephone: +44 (0) 1670 822181· Facsimile: +44 (0) 1670 829465· Email: info@welwyn-tt.com· Website: www.welwyn-tt.com
©
TT Electronics plc
Components
·
Limited
·
Northumberland NE22 7AA,UK
NE22 7AA, UK
Bedlington,
Bedlington, Northumberland
© Welwyn
Limited
©
WelwynComponents
Issue B · 03.02
Telephone:
Telephone: +44 (0) 1670 822181 ·
(0) 1670 829465· Email: info@welwyn-tt.com· Website: www.welwyn-tt.com
+44
© TT elect
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ronics plc
Issue B · 03.02
104
11.17
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BI 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
105
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