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Low Value 3W Chip Resistors
LRF3W Series
Welwyn Components
* * *
3 Watts @ 70C Resistance range from 0.003 to 0.1 Tolerances to 1%
Electrical Data
Characteristic Power dissipation @70C Resistance Range Dielectric withstand Ambient temp range Resistance tolerance TCR Pad & trace area for maximum power rating* Value 3 Watts 0.003 to 0.100 200V -55 to +150C R005 5%, >R005 2, 5%, R01 1, 2, 5% 100ppm/C 300mm2
Power Derating Curve
100 % Of Power Rating 80 60 40 20 0 25 70 Temperature in C 150
Physical Data
Top Bottom (Board Side)
0.81 0.13mm
Recommended Solder Pad Layout
0.51 0.13mm
Plating wrap-around 6.35 0.13mm
2.29 0.13mm
7.6mm
2mm 1mm 0.94 mm max thickness 3.18 0.13mm
Weight 0.065g typ.
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. A subsidiary of TT electronics plc Issue D * 07.06
(c) 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
84
Low Value 3W Chip Resistors
LRF3W Series
Construction
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.
Welwyn Components
Chips can withstand immersion in solder at 250C 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.
Terminations
The wrap-around terminations have an electroplated nickel barrier and matte tin finish, this ensures excellent `leach' resistance properties and solderability.
Performance Data
Typical Load at rated power: 1000 hours at 70C MIL-PRF-55342 Overload: 6.25 x rated power for 2 seconds MIL-PRF-55342 High temperature exposure: MIL-PRF-55342 Low temperature operation: MIL-PRF-55342 Low temperature storage: -65C, 100 hours Moisture: MIL-PRF-55342 Temperature cycling: MIL-STD-883 Method 1010 Test condition B Thermal shock: MIL-STD-202 Method 107 condition B -65C +125C Resistance to solder heat: MIL-STD-202 Method 210 Shelf life test: 12 months at room temperature Leach resistance: molten solder 250C R% R% R% R% R% R% R% R% R% R% 1 0.5 0.5 0.5 0.5 0.5 0.25 0.25 0.25 0.1 90 Seconds min.
Packaging
LRF3W Resistors are supplied taped and reeled as per IEC 286-3. The standard quantity per reel is 1800 parts.
T2 D0 P2 P0
T
Marking (Both sides)
33 1.0
13 0.5mm
E F
13 0.5 178 2 80 2
B0
2.5 0.5
0.8 0.15
T1 K0
A0 P1
D1
Tape dimensions in mm
LRF3W
W 0.3 12
P1 0.1 8
P0 0.1 4
P2 0.05 2
D0 0.1 1.5
D1 0.2 1.5
E 0.1 1.75
F 0.05 5.5
A0 0.1 3.61
B0 0.1 6.96
K0 0.1 1.17
T 0.05 0.28
T1 nom 0.06
G
T2 0.15 1.45
(c) 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 Issue D * 07.06
W
85
Low Value 3W Chip Resistors
LRF3W Series
Welwyn Components
Ordering Procedure
Specify type reference, value and tolerance as shown in this example of LRF3W 5m 2%: Type Resistance value (IEC62 code) Tolerance (IEC62 code)
F G J 1% 2% 5%
LRF3W
R005
G
(c) 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 Issue D * 07.06
86

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