ip Resistors
W Series
Low Value 3W
Resistors
Low Value 3W
Welwyn Compon
Welwyn Components
Welwyn Components
atts @ 70°C
Chip
Value 3W Chip Resistors
Resistors
Low
Resistors
Chip
LRF3W Series
LRF3W Series
stance range
Series
0.003 to 1Ω
LRF3W
from
•
3 Watts @
package
3W in 1225
70°C
rances to
Resistance range from 0.003 to 0.1Ω
1Ω
±1%
•
Resistance 70°C from 0.003 to
3 Watts @ range
•
Tolerances to ±1%
Resistance
±1%
Tolerances
-Q200 Qualified
to
range from 0.003 to 1Ω
Tolerances to ±1%
AEC-Q200 Qualified
•
AEC-Q200 Qualified
Low thermal impedance
•
AEC-Q200 Qualified
Wide terminations enhance robustness
RoHS compliant and SnPb variants
All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
% Of % Of Power Rating
Power Rating
trical Data
Electrical Data
Electrical Data
Characteristic
Power
cteristic
@70°C
Power
a
rating @70°C
Char
dissipation
Resistance Range
Resistance range
1
@70°C
Power dissipation
Value
3
Value
Watts
watts
R003Watts
1R0
3 to
ohms
Power Derating Curve
Power Derating Curve
LRF3W
100
100
80
80
60
Power Derating Curve
3
teristic
% Of Power Rating
issipation
Dielectric
tolerance
Resistance
wRangend
Resistance ithsta
Ambient
@70°C
ictempsrange
TCR
lectr with tand
Die
Value
200V
3
%
R003 to 1R0
-55 to 00V
+150°C
Watts
2
ppm/°C
100
5, ≥R004: 1, 2, 5
<R004:
80
≥R004: ±100
R003 to R10
60
40
<R004: ±550,
40
<R004 5%,
20
Ambient temp range
Dielectric withstand
200
R003 to
-55 to +150°C
1R0
volts
Resistance tolerance
≥R004
1, 2, 5%
Ambient temperature range
°C
-55 to +150
<R004 5%,
20
60
0
Resistance tolerance
c withstand
TCR
200
±100p1,m/°5%
V
p 2, C
25°
70°
≥R004
Values
E24 preferred
2
Temperature in °C
0
Pad
70°
40
25°
500
T
±100pp
mm
C
m
t temp range
CR
/
& trace area for maximum
-55 to +150°C
2
°
2
Pad trace area
3
300mm /
Temperature in °C
power trace area for maximum
rating*
Pad &
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.
300mm
<R004 5%,
2
20
power rating*
Note 3: Recommended minimum pad & adjacent trace area for each termination for rated dissipation on FR4 PCB
ce tolerance
ce Range
150°
150°
Physical Data
Physical Data
Top
Top
≥R004
1, 2, 5%
±100ppm/°C
300mm
2
0
Bottom
(Board Side)
Bottom
Bottom
(Board
Side)
ace area for maximum
ating*
0.51
±
0.13mm
0.51
±
0.13mm
Plating
wrap-around
Plating
wrap-around
0.81
±
0.13mm
0.81
±
0.13mm
2.29
±
0.13mm
2.29
±
0.13mm
Solder Pad Layout
Recommended Solder Pad Dimensions
Recommended
Recommended Solder
Kelvin PCB traces
with example
Pad Dimensions
Solder Pad Layout
with example Kelvin PCB traces
70°
Recommended
Temperature in °C
25°
150°
sical Data
6.5
±
0.38mm
6.5
±
Top
0.38mm
7.6mm
7.6 mm
Current Track:
I
7.6mm
Bottom
(Board Side)
Sense Tracks: V+
Recommended
Solder Pad Layout
1mm
2 mm
2mm
V-
1 mm
1mm
2mm
0.51
±
0.13mm
3.25
±
0.25mm
3.25
±
0.25mm
0.94 mm max
thickness
0.94 mm max
thickness
Current Track:
I
0.81
±
0.13mm
Weight 0.065g typ.
Weight 0.065g typ.
Plating
wrap-around
2.29
±
0.13mm
7.6mm
0.38mm
2m
General Note
Welwyn Components reserves the right to make changes
mm max
specification without notice or liability.
0.94
in product
General Note
BI Technologies IRC
A
Welwyn
subsidiary of
General Note
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
TT Electronics reserves the right to make changes in product
thickness
without notice or liability.
specification
TT electronics plc
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is
is subject to Welwyn’s own data and is considered
accurate
NE22 7AA, UK
to
to print.
A subsidiary of
All information
subject to TT Electronics’ own
Bedlington, Northumberland at time
going
© Welwyn Components Limited
·
data and is considered
accurate
at time of
of going
print.
www.ttelectronics.com/resistors
3.25
±
0.25mm
1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
TT electronics plc
04.10
Telephone: +44 (0)
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
© TT Electronics plc
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
04.10
11.17
1m
84
Weight 0.065g typ.
Low Value 3W
3W
Low Value
Chip Resistors
LRF3W Series
Construction
Chip Resistors
LRF3W Series
Welwyn Components
Chips can withstand immersion in solder at 250°C for
90 seconds and are suitable for reflow or wave soldering
mounting applications.
Patented non-noble copper based thick film material,
overglaze and organic protection are screen printed on a 96%
alumina substrate. The components are laser trimmed to
achieve the required resistance tolerance.
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.
Terminations
The wrap-around terminations have an electroplated nickel
barrier and matte tin finish, this ensures excellent ‘leach’
resistance properties and solderability.
Performance Data
AEC-Q200 Table 7
ref
3
4
6
7
8
14
15
16
18
21
22
Test
High Temp. Exposure
Temperature Cycling
Moisture Resistance
Biased Humidity
Operational Life (Cyclic Load)
Vibration
Resistance to Soldering Heat
Thermal Shock
Solderability
Board Flex
Terminal Strength
Short Term Overload
Low Temperature Storage
Shelf Life Test
Leach Resistance
Method
MIL-STD-202 Method 108
JESD22 Method JA-104
MIL-STD-202 Method 106
MIL-STD-202 Method 103
MIL-STD-202 Method 108
MIL-STD-202 Method 204
MIL-STD-202 Method 210
MIL-STD-202 Method 107
J-STD-002
AEC-Q200-005
AEC-Q200-006
6.25 x Pr for 2s
-65°C for 100 hours
Room temp for 12 months
Solder dip at 250°C
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
(add R05)
Max.
(@R20)
Typ.
0.5
0.25
0.5
0.5
1
0.5
0.25
0.25
>95% coverage
0.5
0.25
0.5
0.5
0.1
90s minimum
0.2
0.1
0.2
0.2
0.5
0.05
0.05
0.1
0.2
0.1
Notes:
1. Full AEC-Q200 qualification applies to ohmic values
≥
R02.
Packaging
LRF3W Resistors are supplied taped and reeled as per IEC 286-3. The standard quantity per reel is 1800 parts.
Thermal Data
Marking
(Both sides)
T
2
D
0
P
2
P
0
T
Temperature Derating
13
±
0.5
33
±
1.0
13
±
0.5mm
178
±
2
80
±
2
80
Temperature Rise (°C)
100
3W
B
0
2W
A
0
D
1
P
1
P/Pr (%)
60
40
2.5
±
0.5
0.8
±
0.15
T
1
K
0
1W
20
Tape dimensions in mm
0
LRF3W
0
W
±0.3
20
12
P1
P0
P2
D0
±0.1
60
±0.1
80
±0.05 ±0.1
40
100
120
8
4
2
(°C)
1.5
Ambient Temperature
D1
E
F
10
±0.2
160
±0.1 ±0.05
100
140
1.5
1.75
5.5
A0
B0
K0
T
T1
±0.1
±0.1
±0.1 ±0.05
nom
3.61
Copper Area per Termination (mm
2
)
1.17
0.28
0.06
PCB
6.96
G
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
General
+44 (0)
Telephone:
Note
1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
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.
04.10
BI Technologies IRC Welwyn
W
100
F
E
Temperature Rise
T2
±0.15
1000
1.45
www.ttelectronics.com/resistors
85
© TT Electronics plc
11.17
Low Value 3W
Chip Resistors
LRF3W Series
Pulse Power
Pulse Power
Data
100
Peak Power (W)
10
Low Value 3W
1
Chip Resistors
LRF3W Series
0.01
0.1
1
10
Pulse Duration(s)
Welwyn Components
Ordering Procedure
Ordering Procedure
Specify type reference,
valid part numbers:
packing as shown in this example of LRF3W 5m•
This product has two
value, tolerance and
Type
LRF3W
G
European (Welwyn) Part Number:
R005
LRF3W-R02FW
(20
W
milliohms ±1%, Pb-free)
Resistance value
L
(IEC62 code)
R
Tolerance
(IEC62 code)
F
G
J
2% on a reel of 1800 pieces:
F
1
3
W
-
R
0
2
2
F
3
W
4
4
1
Type
1%
2%
2
Value
3
Tolerance
F = ±1%
G = ±2%
J = ±5%
Termination & Packing
W
Pb-free, standard packing
PB
SnPb finish, standard packing
Standard packing is tape & reel, 1800/reel
Packing
W
LRF3W E24 = 3/4
5%
characters
R = ohms
Tape
LRF3W
1800/reel
Standard
USA (IRC) Part Number: LRC-LRF3WLF-01-R020-F
(20 milliohms ±1%, Pb-free)
L
R
1
1
Family
LRC
2
Model
3
Termination
C
-
L
R
F
2
4
TCR
3
W
L
3
F
-
0
4
5
Value
6
Tolerance
F = ±1%
G = ±2%
J = ±5%
1
-
R
0
5
2
0
-
F
6
LRF3W Omit for SnPb 01 = ±100ppm/°C 4 characters
R = ohms
LF = Pb-free
Electrical Data
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.
Power rating @70°C
Resistance range
1
© TT Electronics plc
Resistance tolerance
watts
ohms
%
BI Technologies IRC Welwyn
LRF3W
3
www.ttelectronics.com/resistors
R003 to R10
<R004: 5, ≥R004: 1, 2, 5
11.17
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