RL02M558.00C - Page 1 of 3
Product Family:
Part Number Series:
Low Ohm Current Sense Resistor
WEL Series (wrapped electrodes)
Construction:
High Purity Alumina Substrate
Metal film resistive element
Epoxy-resin overcoat
Wrap around electrodes
Sn100 terminations
Anti-Sulfur
Features:
TCR’s down to ±50 ppm/°C
Resistance down to 1mΩ available
High power handling in a small package
Optimal linearity in I/V conversion
High volume production suitable for
commercial and special applications
Competitive pricing
Description:
These low ohm current sense resistors are designed for tight resistance tolerance, low noise, long-term stability and high
heat dissipation capability in a small package. This series is ideal for use in power management modules, motor control
circuits and automotive applications. This series varies from the WKL series as this series has wrap-around electrodes.
Product Dimensions and Recommended Land Patterns:
Part
Number
WEL0603
WEL0805
WEL1206
WEL2010
WEL2512
WEL4320
WEL4527
WEL0508
WEL0612
WEL0815
WEL1020
WEL1225
WEL0830
WEL1530
WEL1836
WEL2043
Electrode
Type
A
A
A
A
A
A
A
B
B
B
B
B
B
B
B
B
Resistance
Range
5mΩ
6mΩ~75mΩ
4mΩ~100mΩ
3mΩ~4mΩ
5mΩ~200mΩ
5mΩ~250mΩ
5mΩ~300mΩ
5mΩ~100mΩ
5mΩ~30mΩ
2mΩ~50mΩ
1mΩ
2mΩ~50mΩ
1mΩ~50mΩ
1mΩ~50mΩ
1mΩ~50mΩ
1mΩ~10mΩ
1mΩ~50mΩ
1mΩ~50mΩ
1mΩ~50mΩ
Component Dimensions (inches)
L
0.066±0.008
0.083±0.008
0.129±0.008
0.201±0.008
0.252±0.012
0.437±0.012
0.457±0.039
0.053 ± 0.008
0.067 ± 0.008
0.102 ± 0.008
0.102 ± 0.008
0.126± 0.012
0.102± 0.012
0.154± 0.012
0.181 ± 0.012
0.201 ± 0.012
Land Pattern Dimensions (inches)
T
0.026±0.008
0.026±0.008
0.026±0.008
0.026±0.008
0.026±0.008
0.026±0.008
0.026±0.012
0.025 ± 0.008
0.020 ± 0.008
W
0.035±0.008
0.053±0.008
0.067±0.008
0.102±0.008
0.126±0.012
0.200±0.012
0.279±0.039
0.083 ± 0.008
0.129 ± 0.008
0.149 ± 0.008
0.201 ± 0.008
0.252± 0.012
0.299± 0.012
0.303 ± 0.012
0.358 ± 0.012
0.437 ± 0.016
A
0.019±0.008
0.016±0.008
0.019±0.008
0.047±0.012
0.026±0.012
0.027±0.012
0.041±0.012
0.093±0.012
0.106±0.016
0.018 ± 0.008
0.021 ± 0.012
0.016 ± 0.008
0.027 ± 0.008
0.025 ± 0.008
0.024 ± 0.008
0.027 ± 0.012
0.027 ± 0.012
0.031 ± 0.012
0.035 ± 0.012
P
0.019
0.024
0.031
0.024
0.047
0.106
0.122
0.197
0.205
0.024
0.019
0.024
0.033
0.039
0.055
0.037
0.067
0.083
0.094
W
0.036
0.057
0.0724
0.113
0.141
0.226
0.317
0.091
0.145
0.167
0.226
0.285
0.339
0.344
0.407
0.498
D
0.053
0.051
0.055
0.083
0.071
0.104
0.122
0.177
0.184
0.043
0.053
0.051
0.092
0.089
0.093
0.089
0.100
0.106
0.110
0.0.025 ± 0.008
0.025 ± 0.008
0.025 ± 0.008
0.025 ± 0.008
0.025 ± 0.008
0.026 ± 0.008
0.026 ± 0.008
Product Dimensions and Recommended Land Patterns:
Thin Film Technology Corp. / 1980 Commerce Drive, North Mankato, MN 56003 (USA) / (507) 625-8445 /
www.thin-film.com
RL02M558.00C - Page 2 of 3
Electrical Specifications:
Type
Electrode Style
Metric Size
Power
Resistance Offering
(mΩ)
Tolerance% (code)
Resistance Offering
TCR ± ppm/°C
Operating Temp.
Range
Rated Voltage
Packaging
5,000 pcs/reel
100
50
100
50
100
50
1608
0.5 Watts
5~9
±1.0(F)
10~75
±0.5(D)
±1.0(F)
2012
0.75 Watts
4~9
±1.0(F)
10~100
±0.5(D)
±1.0(F)
3216
1.0 Watts
3~9
±1.0(F)
10~200
±0.5(D)
±1.0(F)
WEL0603
WEL0805
WEL1206
WEL2010
WEL2512
WEL4320
WEL4527
Type “A” - Short Side Electrode
5025
1.5 Watts
5~9
±1.0(F)
10~250
±0.5(D)
±1.0(F)
6432
2.0 Watts
5~9
±1.0(F)
10~300
±0.5(D)
±1.0(F)
11050
3.0 Watts
5~9
±1.0(F)
10~100
±0.5(D)
±1.0(F)
11470
4.0 Watts
5~9
±1.0(F)
10~30
±0.5(D)
±1.0(F)
1mΩ steps
100
50
100
50
100
50
100
50
M= -55°C ~ 155°C , C= -55°C~175°C
√Power x Resistance
4,000 pcs/reel
2,000 pcs/reel
1,000 pcs/reel
Type
Electrode
Style
Metric Size
Power
Resistance
Offering
(mΩ)
Tolerance
% (code)
Resistance
Offering
TCR ±
ppm/°C
Operating
Temp.
Range
Rated
Voltage
Packaging
WEL0508
WEL0612
WEL0815
WEL1020
WEL1225
WEL0830
WEL1530
WEL1836
WEL2043
Type “B” - Long Side Electrode
1220
1.0 Watts
2~9
10~50
±0.5(D)
±1.0(F)
1632
1.5 Watts
1~9
10~50
±0.5(D)
±1.0(F)
2040
2.0 Watts
1~9
10~50
±0.5(D)
±1.0(F)
2550
2.0 Watts
1~9
10~50
±0.5(D)
±1.0(F)
3264
3.0 Watts
1~9
10~50
±0.5(D)
±1.0(F)
2276
3.0 Watts
1~9
10
±0.5(D)
±1.0(F)
3876
4.0 Watts
1~9
10~50
±0.5(D)
±1.0(F)
4590
4.0 Watts
1~9
10~50
±0.5(D)
±1.0(F)
05110
5.0 Watts
1~9
10~50
±0.5(D)
±1.0(F)
±1.0(F)
±1.0(F)
±1.0(F)
±1.0(F)
±1.0(F)
±1.0(F)
±1.0(F)
±1.0(F)
±1.0(F)
1mΩ steps
100
50
100
50
100
50
100
50
100
50
100
50
100
50
100
50
100
50
M= -55°C ~ 155°C , C= -55°C~175°C
√Power x Resistance
5,000 pcs/reel
4,000 pcs/reel
2,000 pcs/reel
Operating Temperatures and Derating Curves:
Parameter
Rated Ambient Temp
Specification
+70°C
Type M:
-55°C~155°C
Type C:
-55°C~175°C
Operating Temp Range
Part Numbering:
Ex: WEL0508MR010F-T5
Product
Designator
English Size
Operating Temp
Range
Resistance Value
Resistance
Tolerance
D = ±0.5%
F = ±1.0%
T&R Packaging
Quantity
-T1 = 1,000
-T2 = 2,000
-T4 = 4,000
-T5 = 5,000
WEL
(refer to “type” in
electrical tables)
M = -55°C~155°C Ex. R010=10mΩ
R100=100mΩ
C= -55°C~175°C
(refer to tables)
(refer to tables)
(refer to tables)
Thin Film Technology Corp. / 1980 Commerce Drive, North Mankato, MN 56003 (USA) / (507) 625-8445 /
www.thin-film.com
RL02M558.00C - Page 3 of 3
Reliability Testing:
Test
Conditions of Test
Requirement
Load Life
Rated voltage for 90 min followed by a 30 min pause at a temp of 70 ± 2°C. Cycle
repeated for 1000 hours
± 2.0% + 0.5mΩ
IEC60115-1 4.25
Moisture Load Life
Rated voltage for 90 min followed by a 30 min pause at a temp of 60 ± 2°C. Cycle
repeated for 1000 hours
± 2.0% + 0.5mΩ
IEC60115-1 4.25
Temperature Cycle
-55°C 30min R.T. 3min +155°C 30min R.T. 3min (100 cycles)
± 1.0% + 0.5mΩ
IEC60115-1 4.19
Soldering Heating
Dipped in solder for 20 ± 1sec at 275 ± 5°C
± 1.0% + 0.5mΩ
IEC60115-1 4.18
Substrate Bending
Span between fulcrums = 90mm
Bend width = 2mm
Test board = glass epoxy t=1.6mm
± 1.0% + 0.5mΩ
IEC60115-1 4.21
Solderability
Dipped in solder for 3 ± 0.5 sec at 245 ± 5ºC
Min 90% coverage of critical area
IEC60115-1 4.17
Wave Solder Temperature:
Solder Reflow Temperature Condition:
Thin Film Technology Corp. / 1980 Commerce Drive, North Mankato, MN 56003 (USA) / (507) 625-8445 /
www.thin-film.com
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