Low Resistance Metal
Element Resistors
LOB Series
Ultra low resistance values
(0.005Ω to 0.1Ω)
Available in 1, 3 and 5 rated packages
Tolerances from ±1% to ±5%
Inherently (≤.02μH at 0.5MHz)
Low temperature of resistance
High stability over life
* 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, this must be taken
into account when selecting a resistor.
Low Resistance Metal
Element Resistor s
LOB Serie s
•Ultra low resistance values
(0.005Ωto 0.1Ω)
•Available in 1, 3 and 5 watt rated packages
•Tolerances from ±1% to ±5%
•Inherently non-inductive (≤.02µH at 0.5MHz)
•Low temperature coefficient of resistance
•High stability over life
Dimensions (mm)
Type L max. D max. f min. d nom. C
LOB-1
9.9±0.3 3.6±0.2 38.1±3.2 0.813±0.05 33.27
LOB-3
14.22±0.25 5.33±0.25 34.93±3.18 0.81±0.05 33.27
LOB-5
23.37±0.25 8.38±0.25 31.75±3.18 1.02±0.05 42.42
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
© Welwyn Components Limited ·Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 ·Facsimile: +44 (0) 1670 829465 ·Email: info@welwyn-tt.com ·Website: www.welwyn-tt.com
LOB-1 LOB-3 LOB-5
Continuous power dissipation at 25°C in free air watts 1 3 5
52515sttawsdnoces5rofrewopdaolrevO stlovegatlovgnikrowmumixaM √1xR √3xR √5xR
-55 to 175 -55 to 175 -55 to 175C°Operating temperature
Electrical Data
Physical Data
Issue B ·03.02
A subsidiary of
TT electronics plc
Welwyn Components
104
L
C
Df
d
contact point contact point
Description
LOBΩSeries power precision metal element resistors feature
resistance values down to 0.005Ωwith virtually no
inductance. Available in 1, 3 and 5 watt rated axial leaded
packages, these resistors are compatible with automatic
insertion equipment.
Applications
•Switchmode and linear power supplies.
•Automotive current-sensing circuits.
•Instrumentation.
Construction
LOBΩSeries 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 moulding compound.
Resistors
All Pb-free parts comply with EU 2011/65/EU (RoHS2)
Low Resistance Metal
Element Resistors
LOB Series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
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.
© TT electronics plc 11. 11
·Ultra low resistance values
(0.005 to 0.1 )
·Available in 1, 3 and 5 watt rated packages
·Tolerances from ±1% to ±5%
·Inherently non-inductive ( .02µH at 0.5MHz)
·Low temperature coefficient of resistance
·High stability over life
*Power Dissipation - The maximum wattagerating depends upon the amount of heatwhich can be transferred to the surroundings w hile not exceeding the maximum element
temperature. Ambientair temperature,velocity of cooling air,thermal resistance of heat and the temperature ofsurrounding ob jects will a this transfer,this must be taken
into account when selecting a resistor.
Low Resi stance Metal
E lement Resi stors
LOB S eries
•Ultralowresistancevalues
(0.005Ωto0.1Ω)
•Availablein1,3 and5wattratedpackages
•Tolerancesfrom±1%to±5%
•Inherentlynon-inductive( ≤.02µHat0.5MHz)
•Lowtemperature coe ofresistance
•Highstabilityoverlife
Dimensions(mm)
Type L max. D max. fmin. d nom. C
LOB-1
9.9±0.3 3.6±0.2 38.1±3.2 0.813±0.05 33.27
LOB-3
14.22±0.25 5.33±0.25 34.93±3.18 0.81±0.05 33.27
LOB-5
23.37±0.25 8.38±0.25 31.75±3.18 1.02±0.05 42.42
GeneralNote
Welwyn Componentsreserves the right to make changes in product withoutnotice or liability.
All informationis subject to Welwyn’s own dataand is considered accurateat time of going to print.
©WelwynComponentsLimited ·Bedlington, Northumberland NE227AA,UK
Telephone: +44(0) 1670822181·Facsimile: +44(0) 1670829465·Email:info@welwyn-tt.com·Website: www.welwyn-tt.com
LOB-1 LOB-3 LOB-5
Continuouspower dissipation at 25°Cin free air watts 1 3 5
Overload powerfor 5seconds watts 5 15 25
Maximumworkingvoltage volts √1xR √3xR √5xR
Maximumstorage temperature °C 175 175 175
E lectrical Data
Phys ical Data
Issue B ·03.02
Asubsidiary of
TT electronics plc
Welwyn Components
104
L
C
Df
d
contact point contact point
Description
LOBΩSeries power precision metal element resistors feature
resistance values down to 0.005 Ωwithvirtually no
inductance.Available in 1,3 and 5 wattrated axial leaded
packages,these resistors are compatible withautomatic
insertion equipment.
Applications
•Switchmode and linear powersupplies.
•Automotive current-sensing circuits.
•Instrumentation.
Construction
LOBΩSeries resistors feature tinned copper leads welded
directly to a low temperature coe resistance element in
a highly automatedproprietary process.The leaded resistor
elements are then encapsulated in a moulding compound.
*Power Dissipation - The maximum wattagerating depends upon the amount of heatwhich can be transferred to the surroundings while not exceeding the maximum element
temperature. Ambientair temperature,velocity of cooling air,thermal resistance of heat and the temperature of surrounding objects will a this transfer,thismust be taken
into account when selecting a resistor.
Low R esistance Metal
Element R esistors
LOB S eries
•Ultralowresistancevalues
(0.005Ωto0.1Ω)
•Availablein1,3 and5 wattratedpackages
•Tolerancesfrom±1%to±5%
•Inherentlynon-inductive( ≤.02µHat0.5MHz)
•Lowtemperature coe ofresistance
•Highstabilityoverlife
Dimensions (mm)
Type
LOB-1
9.9±0.3
L D f d C nom
33.27
0.813±0.05
38.1±3.2
3.6±0.2
LOB-3
14.22±0.25 5.33±0.25 34.93±3.18 33.27
0.81±0.05
LOB-5
23.37±0.25 42.42
1.02±0.05
31.75±3.188.38±0.25
GeneralNote
Welwyn Componentsreserves the right to make changes in product withoutnotice or liability.
All informationis subject to Welwyn’s owndata and is considered accurateat time ofgoing to print.
©WelwynComponentsLimited ·Bedlington, Northumberland NE227AA,UK
Telephone: +44(0) 1670822181·Facsimile: +44(0) 1670829465·Email:info@welwyn-tt.com·Website: www.welwyn-tt.com
LOB-1 LOB-3 LOB-5
Continuouspower dissipation at 25°Cin free air watts 1 3 5
Overload powerfor 5seconds watts 5 15 25
Maximumworkingvoltage volts √1xR √3xR √5xR
°C
E lectrical Data
Physical Data
Issue B ·03.02
Asubsidiary of
TT electronics plc
Welwyn Components
104
L
C
Df
d
contact point contact point
Description
LOB Series powerprecision metal element resistors feature
resistance values down to 0.005 Ωwithvirtually no
inductance.Available in 1,3 and 5wattrated axial leaded
packages,these resistors are compatible withautomatic
insertion equipment.
Applications
•Switchmode and linear powersupplies.
•Automotive current-sensing circuits.
•Instrumentation.
Construction
LOB Series resistors feature tinned copper leads welded
directly to a low temperature coe resistance element in
a highly automatedproprietary process.The leaded resistor
elements are then encapsulated in a moulding compound.
-55 to 175Operating temperature
08.16
General Note
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronicsresistors.com
BI Technologies IRC Welwyn
Low Resistance Metal
Element Resistors
LOB Series
Low Resistance Metal
Element Resistors
LOB Series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
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.
© TT electronics plc
11. 11
0 25 50 75 100
400
300
200
100
0
Resistance (ohms x 10-3)
Temperature Coefficient
of resistance (ppm/°C)
Low Resistance Metal
Element Resistors
LOB Series
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
105
Issue B · 03.02
Welwyn Components
% X AM202 DTS - L IMt seT ∆t i nU*R
%%1 ±801 doh t eM
) s r uoh 0002 ( e f i l daoL
∆R
%%1 ±701 doh t eMkcohs l amr ehT ∆R
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%%5.0±103 doh t eM htgnerts ci rtceleiD ∆R
01>203 doh t eMecnats i ser noi talusnI 11 ohms
0 25 50 75 100 125 150 175
100
90
80
70
60
50
40
30
20
10
0
Ambient Temp (°C)
Rated Power (%)
Power derating percentage vs
Free air ambient temperature
Temperature coefficient of resistance vs
Resistance value
*±0.0005 ohm allowance for test/contact error.
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 -
L O B 3 – R 0 1 J I
Type
Value (use IEC62 code)
Tolerance (use IEC62 code)
F
1%
5%
H
3%
Note: 1% & 5% preferred
Packing
I
Tape
LOB1
3500/reel
Standard
LOB3
1250/reel
LOB5
800/reel
LOB1
LOB3
LOB5
08.16
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronicsresistors.com
BI Technologies IRC Welwyn
Low Resistance Metal
Element Resistors
LOB Series
Ordering Procedure
This product has two valid part numbers:
European (Welwyn) Part Number: LOB3-R01JI(LOB3, 10 milliohms ±5%, Pb-free)
L
O
B
3
-
R
0
1
J
I
1
2
3
4
USA (IRC) Part Number: LOB-3R010FLFSLT(LOB3, 10 milliohms ±5%, Pb-free)
L
O
B
-
3
R
0
1
0
F
L
F
S
L
T
1
2
3
4
5
1
2
3
4
Type ValueTolerance Packing & Termination Finish
LOB1
R = ohms
F* = ±1%
I = Standard packing & Pb-free
LOB3
H = ±3%
PB = Standard packing & SnPb
LOB5
J* = ±5%
LOB1
Taped, 3500/reel
* preferred
LOB3
Taped, 1250/reel
LOB5
Taped, 800/reel
1
2
3
4
5
Type ValueTolerance Termination Finish Packing
LOB-1
R = ohms
F = ±1%
Omit for SnPb
SLT = Lead Tape*
LOB-3
H = ±3%
LF = Pb-free
LOB-1
3500/reel
LOB-5
J = ±5%
LOB-3
1250/reel
LOB-5
800/reel
BLK = Bulk
*
preferred
LOB-1 1500/box
800/box
200/box
LOB-3
LOB-5
08.16
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronicsresistors.com
BI Technologies IRC Welwyn
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
TT Electronics:
LOB3R040J LOB3R020J LOB3R025J LOB3R100J LOB1R070J LOB5R005J LOB5R025F LOB5R020J
LOB5R020F LOB5R025J LOB5R010J LOB1R040J LOB3R010F LOB3R010J LOB3R015J LOB3R025FTR
LOB3R010FTR LOB5R070J LOB5R020FTR LOB3R080J LOB3R050FTR LOB3R030J LOB5R080J LOB1R050J
LOB3R080HTR LOB1R010J LOB1R025J LOB3R005F LOB-10.051%BLK LOB5R100J LOB5R100F LOB5R050J
LOB5R050F LOB1R030J LOB5R040J LOB3R050F LOB3R005JLF LOB1R080J LOB5R015J LOB5R030J
LOB3R050JLF LOB5R050JLF LOB1R050JLF LOB3R030JLF LOB1R030JLF LOB5R030JLF LOB1R025JLF
LOB5R025JLF LOB3R025JLF LOB3R010JLF LOB5R010JLF LOB1R010JLF LOB5R033FLF LOB5R040JLF
LOB1R040JLF LOB3R040JLF LOB3R100JLF LOB5R100JLF LOB1R020JLF LOB5R020JLF LOB3R020JLF
LOB3R050FLFTR LOB1R005F LOB3R025FLFTR LOB1R005FLFTR LOB3R030FLF LOB1R005FTR
LOB3R005FLF LOB3R005FTRLF LOB3R010FLF LOB3R010FTR-LF LOB3R020FLF LOB3R040FLF
LOB3R050FLF LOB3R060FTR LOB3R070F LOB3R100FLF LOB5R005F LOB5R010F LOB5R020FLF
LOB5R020FLFTR LOB5R030F LOB5R040FLF LOB1R080JLF LOB3R080JLF LOB3R070JLF LOB5R070JLF
LOB1R070JLF LOB3R015JLF LOB5R015JLF LOB1R005JLF LOB5R005JLF LOB5R010FLF LOB5R025FLF
LOB5R100FLF LOB5R005FLF LOB3R030HLF LOB5R050FLF LOB5R030FLF