A subsidiary of
TT electronics plc
Issue C . 11.06
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
Small Size Low Value Current Sense
Surface Mount Chip Resistors
0402, 0603 and 0805 sizes (larger sizes refer to our LRF Series)
Resistance R020 (20m ) to 1R0 (1000m )
Designed for current sensing in power electronic systems
RoHS compliant
Resistance range ohms
Power rating @70
°C watts
TCR ppm/°C
0.063
1(F), 5(J)
E24 preferred
-55 to +155
Resistance tolerance %
Ambient temperature range °C
Standard values
LRCS0402
Isolation voltage volts
0.1
LRCS0603 LRCS0805
0.125: R02 to <R10
0.25: R10 to 1R0
R05 to 1R0 R02 to 1R0 R02 to 1R0
50V 100V 200V
±400: R05  R10
±300: R101  R50
±200: R501  1R0
±600: R02  R05
±400: R051  R10
±300: R101  R50
±200: R501  1R0
±600: R02  R05
±400: R051  R10
±300: R101  R50
±200: R501  1R0
D1TWL
1.00 ±0.05
LRCS0402
LRCS0603
LRCS0805
D2 Nom wt. (g)
0.50 ±0.10 0.32 ±0.10 0.25 ±0.10 0.20 ±0.10 0.0007
1.60 ±0.10 0.80 ±0.10 0.45 ±0.10 0.30 ±0.20 0.30 ±0.20 0.002
2.00 ±0.15 1.25 ±0.15 0.55 ±0.10 0.30 ±0.20 0.40 ±0.25 0.005
All dimensions in mm unless stated.
Construction
A resistor element is applied to an alumina substrate. The product is adjusted to
value and protected. Marking is applied to 0603 and 0805 sizes. A wraparound
conductor is applied to join the top and bottom sides. The terminations are
electroplated with a Ni barrier layer prior to plating with a Sn finish.
Solvent Resistance
The body protection and marking are resistant to all normal industrial solvents
suitable for printed circuits.
Flammability
The resistor will not burn or emit incandescent particles under any condition of
applied temperature or overload.
Solderability
95% min coverage (MIL-STD 202F / 208H, 235C 2 secs)
Electrical Data
Physical Data
LRCS Series
Packaging
The standard packing for LRCS parts is on 8mm wide paper tape wound on 178mm diameter reels.
Ordering Procedure
Example: LRCS0603 at 25 milliohms and 1% tolerance on reel of 5000 pieces:
Marking
The LRCS0402 is not marked, the LRCS0603 is marked with 3 digits and LRCS0805 with 4 digits.
e.g. 100m is marked as R10 (3digit) and R100 (4digit) and 35 m is marked as 035 (3digit) or R035 (4digit)
LRCS0603 R 0 2 5 F T5
Type
Value (use IEC62 code)
Tolerance (use IEC62 code)
F1%
Packing
T10
Type
LRCS0402
A
B
0.6
Issue C . 11.06
© 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
Mounting
C
LRCS0603
LRCS0805
1.0
1.0
0.4
0.7
0.8
0.50±0.2
1.00±0.2
1.30±0.2
A
B
C
Load at rated power (1000hrs cyclic load at 70°C) R% ±1% + 0.05
De-rating from rated power at 70°C See Graph
Short term overload (6.25 x rated power for 5s) R% ±0.5% + 0.05
±1% + 0.05 (0.25W LRCS0805 rating)
Dry heat (96Hrs, no load, +155°C) R% ±0.5% + 0.05
Temperature rapid change (-55 / +150ºC, 100 cycles) R% ±0.5% + 0.05
Damp heat steady state R% ±0.5% + 0.05
Resistance to solder heat (260ºC for 10s) R% ±0.5% + 0.05
Low Temperature Operation R% ±0.5% + 0.05
Insulation Resistance >1000M
Maximum
J5%
T5
T5
Tape
Tape
Tape
0402
0603
0805
10,000 / reel
5,000 / reel
5,000 / reel
100%
0%
-55 70 155
T°C
Power de-rating graph
LRCS Series
Performance Data