Low Value 3W Chip Resistors
LRF3W Series
3W in 1225 package
Resistancerangefrom0.003to0.1Ω
Tolerances to ±1%
AEC-Q200Qualied
Lowthermalimpedance
Wideterminaonsenhancerobustness
RoHScompliantandSnPbvariants
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Power dissipation @70°C 3 Watts
Resistance Range R003 to 1R0
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Ambient temp range -55 to +150°C
Resistance tolerance <R004 5%,
≥R004 1, 2, 5%
C°/mpp001±RCT
Pad & trace area for maximum
power rating* 300mm2
Low Value 3W
Chip Resistors
LRF3W Series
•3 Watts @ 70°C
•Resistance range from 0.003 to 1Ω
•
•
Tolerances to ±1%
AEC-Q200 Qualified
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
Electrical DataPower Derating Curve
04.10
A subsidiary of
TT electronics plc
Welwyn Components
84
0.51 ± 0.13mm
6.5 ± 0.38mm
3.25 ± 0.25mm
0.94 mm max
thickness
Plating
wrap-around
0.81 ± 0.13mm
2.29
± 0.13mm
7.6mm
2mm
1mm
Physical Data
100
80
60
40
20
0 25° 70° 150°
Temperature in °C
% Of Power Rating
Top Bottom
(Board Side)
Recommended
Solder Pad Layout
Weight 0.065g typ.
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Power dissipation @70°C 3 Watts
Resistance Range R003 to 1R0
V002dnatshtiw cirtceleiD
Ambient temp range -55 to +150°C
Resistance tolerance <R004 5%,
≥R004 1, 2, 5%
C°/mpp001±RCT
Pad & trace area for maximum
power rating* 300mm2
Low Value 3W
Chip Resistors
LRF3W Series
•3 Watts @ 70°C
•Resistance range from 0.003 to 1Ω
•
•
Tolerances to ±1%
AEC-Q200 Qualified
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
Electrical Data
Power Derating Curve
04.10
A subsidiary of
TT electronics plc
Welwyn Components
84
0.51 ± 0.13mm
6.5 ± 0.38mm
3.25 ± 0.25mm
0.94 mm max
thickness
Plating
wrap-around
0.81 ± 0.13mm
2.29
± 0.13mm
7.6mm
2mm
1mm
Physical Data
100
80
60
40
20
0 25° 70° 150°
Temperature in °C
% Of Power Rating
Top Bottom
(Board Side)
Recommended
Solder Pad Layout
Weight 0.065g typ.
LRF3W
Power rating @70°C watts 3
Resistance range1ohms R003 to R10
Resistance tolerance % <R004: 5, ≥R004: 1, 2, 5
TCR ppm/°C <R004: ±550, ≥R004: ±100
Dielectric withstand volts 200
Ambient temperature range °C -55 to +150
Values E24 preferred2
Pad / trace area3mm2500
Recommended Solder Pad Dimensions
with example Kelvin PCB traces
7.6 mm
1 mm
2 mm
Sense Tracks: V+ V-
Current Track: I
Current Track: I
Recommended Solder Pad Dimensions
with example Kelvin PCB traces
Top Bottom
(Board Side)
Note 1: Contact factory for values outside this range. Note 2: Many values = N x R001 and N x R005 up to N=10 are also available.
Note 3: Recommended minimum pad & adjacent trace area for each termination for rated dissipation on FR4 PCB
Resistors
03.19
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.ttelectronics.com/resistors
BI Technologies IRC Welwyn
AllPb-freepartscomplywithEUDirecve2011/65/EUamendedby(EU)2015/863(RoHS3)AllPb-freepartscomplywithEUDirecve2011/65/EUamendedby(EU)2015/863(RoHS3)
Low Value 3W
Chip Resistors
LRF3W Series
Low Value 3W
Chip Resistors
LRF3W 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 04.10
Welwyn Components
85
Performance Data
Construction
Patented non-noble copper based thick film material
and organic protection are screen printed on a 96%
alumina substrate. The components are laser trimmed
to achieve the required resistance tolerance.
Terminations
The wrap-around terminations have an electroplated nickel
barrier and matte tin finish, this ensures excellent ‘leach’
resistance properties and solderability.
Chips can withstand immersion in solder at 250°C for
90 seconds and are suitable for reflow or wave soldering
mounting applications.
Marking
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
Chips are packed and mounted with marking side up.
The LRF3W Chips are mounted with the actual resistor
element mounted face down on its termination pads.
Packaging
LRF3W Resistors are supplied taped and reeled as per IEC 286-3. The standard quantity per reel is 1800 parts.
Notes:
1. Full AEC-Q200 qualification applies to ohmic values �≥R02.
Tape dimensions in mm
W P1 P0 P2 D0 D1 E F A0 B0 K0 T T1 T2
±0.3 ±0.1 ±0.1 ±0.05 ±0.1 ±0.2 ±0.1 ±0.05 ±0.1 ±0.1 ±0.1 ±0.05 nom ±0.15
LRF3W 12 8 4 2 1.5 1.5 1.75 5.5 3.61 6.96 1.17 0.28 0.06 1.45
2.5 ± 0.5
13 ± 0.5
33 ± 1.0
Marking
(Both sides)
0.8 ± 0.15
80 ± 2
178 ± 2
13 ± 0.5mm
P
1
A
0
B
0
D
1
D
0
P
0
P
2
G F
W
E
T
2
T
1
K
0
T
AEC-Q200 Table 7 Method Max.
(add R05)
Typ.
(@R20)
ref Test
3 High Temp. Exposure MIL-STD-202 Method 108 R% 0.5 0.2
4 Temperature Cycling JESD22 Method JA-104 R% 0.25 0.1
6 Moisture Resistance MIL-STD-202 Method 106 R% 0.5 0.2
7 Biased Humidity MIL-STD-202 Method 103 R% 0.5 0.2
8 Operational Life (Cyclic Load) MIL-STD-202 Method 108 R% 1 0.5
14 Vibration MIL-STD-202 Method 204 R% 0.5 0.05
15 Resistance to Soldering Heat MIL-STD-202 Method 210 R% 0.25 0.05
16 Thermal Shock MIL-STD-202 Method 107 R% 0.25 0.1
18 Solderability J-STD-002 >95% coverage
21 Board Flex AEC-Q200-005 R% 0.5 0.2
22 Terminal Strength AEC-Q200-006 R% 0.25 0.1
Short Term Overload 6.25 x Pr for 2s R% 0.5
Low Temperature Storage -65°C for 100 hours R% 0.5
Shelf Life Test Room temp for 12 months R% 0.1
Leach Resistance Solder dip at 250°C 90s minimum
0
20
40
60
80
100
020 40 60 80 100 120 140 160
P/Pr (%)
Ambient Temperature (°C)
Temperature Derating
Thermal Data
10
100
100 1000
Temperature Rise (°C)
PCB Copper Area per Termination (mm2)
Temperature Rise
1W
3W
2W
03.19
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.ttelectronics.com/resistors
BI Technologies IRC Welwyn
Low Value 3W
Chip Resistors
LRF3W Series
Pulse Power Data
1
10
100
0.01 0.1 110
Peak Power (W)
Pulse Duration(s)
Pulse Power
Type LRF3W R005 G W
Resistance value
(IEC62 code)
Tolerance
(IEC62 code)
Packing
Low Value 3W
Chip Resistors
LRF3W 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 04.10
Welwyn Components
86
F 1%
G 2%
J 5%
Ordering Procedure
Specify type reference, value, tolerance and packing as shown in this example of LRF3W 5m• 2% on a reel of 1800 pieces:
W Tape LRF3W 1800/reel Standard
Ordering Procedure
This product has two valid part numbers:
European (Welwyn) Part Number:LRF3W-R02FW (20 milliohms ±1%,Pb-free)
L
R
F
3
W
-
R
0
2
F
W
1
2
3
4
USA (IRC) Part Number: LRC-LRF3WLF-01-R020-F (20 milliohms ±1%,Pb-free)
L
R
C
-
L
R
F
3
W
L
F
-
0
1
-
R
0
2
0
-
F
1
2
3
4
5
6
Electrical Data
LRF3W
Power rating @70°C
watts
3
Resistance range1
ohms
R003 to R10
Resistance tolerance
%
<R004: 5, ≥R004: 1, 2, 5
TCR
ppm/°C
<R004: ±550, ≥R004: ±100
Dielectric withstand
volts
200
Ambient temperature range
°C
-55 to +150
Values
E24 preferred2
Pad / trace area3
mm2
500
Note 1: Contact factory for values outside this range. Note 2: Many values = N x R001 and N x R005 up to N=10 are also available. Note 3:
Recommended minimum pad & adjacent trace area for each termination for rated dissipation on FR4 PCB
1
2
3
4
Type Value Tolerance Termination & Packing
LRF3W
E24 = 3/4
characters
R = ohms
F = ±1%
W
Pb-free, standard packing
G= ±2%
PB
SnPb finish, standard packing
J= ±5%
Standard packing is tape & reel, 1800/reel
1
2
3
4
5
6
Family Model Termination TCR Value Tolerance
LRC
LRF3W
Omit for SnPb
01 = ±100ppm/°C
4characters
R = ohms
F = ±1%
LF = Pb-free
G= ±2%
J= ±5%
03.19
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.ttelectronics.com/resistors
BI Technologies IRC Welwyn