Current Sense SMD Resistors
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What are Current Sense SMD Resistors?
Current Sense Resistors are similar to normal resistors but with very low resistance ratings and high power ratings. These shunt resistors of known resistor value (R) are placed in a current conducting path so that the entire current (I) which is to be measured flows through them. By measuring the voltage drop (V) across the resistor and then using simple Ohm’s Law (I=V/R), we can calculate the amount of current that flows through the circuit.
Why use a current sense resistor?
Sensing the current flow is an important requirement in many power and general electronics applications. Often, current sensing is essential to monitor and control an application; for example, a battery charger circuit requires current sensing capability to correctly charge the battery and to determine the charge current needed from the driver.
How do I choose a current sense resistor?
The first step in selecting a current sense resistor is based on understanding the application, particularly in terms of its maximum input voltage. Also, as it will be passing a heavy current (because it is connected in series with the load) its I2R losses will likely be significant even if its resistance value is small. Therefore, a knowledge of its power rating is essential.
The next step is to know the tolerance and package required for the shunt resistor. Less than 1% tolerance is a good choice. But if the application demands extra accuracy, 0.5% to 0.1% tolerance shunt resistors may be more appropriate.
After choosing the value, power rating, and tolerance, it is important to select a suitable package that is easy to solder as well as with a lower footprint for smaller PCB areas. Try to select a resistor with a very low TCR value, ideally below 100 ppm/°C.
Manufacturer Part No | Newark Part No. | Description / Manufacturer | Availability | Price for: |
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ERJ8BWFR100V
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08N2429 |
SMD Current Sense Resistor, 0.1 ohm, ERJ8B Series, 1206 [3216 Metric], 1 W, ± 1%, Thick Film PANASONIC
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0.1ohm | ERJ8B Series | 1206 [3216 Metric] | 1W | ± 1% | Thick Film | - | - | - | ± 100ppm/°C | 3.2mm | 1.6mm | 0.65mm | -55°C | 155°C | AEC-Q200 | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
WSL2512R2500FEA
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26R4263 |
SMD Current Sense Resistor, 0.25 ohm, WSL Series, 2512 [6432 Metric], 1 W, ± 1%, Metal Strip VISHAY
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0.25ohm | WSL Series | 2512 [6432 Metric] | 1W | ± 1% | Metal Strip | - | - | - | ± 75ppm/°C | 6.35mm | 3.18mm | 0.635mm | -65°C | 170°C | AEC-Q200 | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
RL1220S-R10-F
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28K1608 |
SMD Current Sense Resistor, 0.1 ohm, RL Series, 0805 [2012 Metric], 250 mW, ± 1%, Thin Film SUSUMU
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0.1ohm | RL Series | 0805 [2012 Metric] | 250mW | ± 1% | Thin Film | - | - | - | 0ppm/°C to +200ppm/°C | 2.01mm | 1.25mm | 0.4mm | -55°C | 125°C | - | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
WSK2512R0250FEA
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98K2976 |
SMD Current Sense Resistor, WSK Series, Power Metal Strip-«, 0.025 ohm, WSK Series VISHAY
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0.025 | WSK Series | 2512 [6432 Metric] | 1 | ± 1% | Metal Film | - | - | - | ± 35ppm/°C | 6.35 | 3.18 | 0.635 | -65 | 170 | AEC-Q200 | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
WSL2512R1000FEA
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98K3046 |
SMD Current Sense Resistors, AEC-Q200 WSL Series, 0.1 ohm, 1 W, - 1%, 310 mV RoHS Compliant: Yes VISHAY
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0.1ohm | WSL | 2512 [6432 Metric] | 1W | ± 1% | Metal Strip | - | - | - | ± 75ppm/°C | 6.35mm | 3.18mm | 0.635mm | -65°C | 170°C | AEC-Q200 | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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CRA2512-FZ-R020ELF
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14P5518 |
SMD Current Sense Resistor, CRA2512 Series, 0.02 ohm, CR Series, 2512 [6432 Metric], 3 W, ± 1% BOURNS
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0.02 | CR Series | 2512 [6432 Metric] | 3 | ± 1% | Metal Film | - | - | - | ± 75ppm/°C | 6.4 | 3.2 | 0.7 | -55 | 170 | AEC-Q200 | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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RL3720WT-R010-F
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28K1735 |
SMD Current Sense Resistor, 0.01 ohm, RL Series, 1508 [3820 Metric], 1 W, ± 1%, Thin Film SUSUMU
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0.01ohm | RL Series | 1508 [3820 Metric] | 1W | ± 1% | Thin Film | - | - | - | 0, +350ppm/°C | 2mm | 3.75mm | 0.5mm | -55°C | 125°C | - | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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CRA2512-FZ-R010ELF
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14P5516 |
SMD Current Sense Resistor, CRA2512 Series, 0.01 ohm, CR Series, 2512 [6432 Metric], 3 W, ± 1% BOURNS
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0.01 | CR Series | 2512 [6432 Metric] | 3 | ± 1% | Metal Film | - | - | - | ± 75ppm/°C | 6.4 | 3.2 | 0.7 | -55 | 170 | AEC-Q200 | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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LRCS0402-1RFT5
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61M7599 |
SMD Current Sense Resistors, LRCS Series, 1 ohm, 63 mW, - 1%, 0402 [1005 Metric] RoHS Compliant: Yes TT ELECTRONICS / WELWYN
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1ohm | LRCS | 0402 [1005 Metric] | 63mW | ± 1% | Metal Film | - | - | - | ± 200ppm/°C | 1.02mm | 0.5mm | 0.32mm | -55°C | 155°C | - | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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ERJ14BSFR10U
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63W0518 |
SMD Current Sense Resistors, AEC-Q200 ERJ Series, 0.1 ohm, 500 mW, - 1% RoHS Compliant: Yes PANASONIC
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0.1ohm | ERJ14B | 1210 [3225 Metric] | 500mW | ± 1% | Thick Film | - | - | - | ± 200ppm/°C | 3.2mm | 2.5mm | 0.6mm | -55°C | 125°C | AEC-Q200 | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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LRC-LR1206LF-01-R250-F
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70K8688 |
SMD Current Sense Resistor, LRC Series, 0.25 ohm, LRC Series, 1206 [3216 Metric], 500 mW, ± 1% TT ELECTRONICS / INTERNATIONAL RESISTIVE
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0.25 | LRC Series | 1206 [3216 Metric] | 500 | ± 1% | Thick Film | - | - | - | ± 100ppm/°C | 3.2 | 1.6 | 0.8mm | -55 | 150 | AEC-Q200 | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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RL1632S-R050-F
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28K1692 |
SMD Current Sense Resistor, 0.05 ohm, RL Series, 1206 [3216 Metric], 500 mW, ± 1%, Thin Film SUSUMU
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0.05ohm | RL Series | 1206 [3216 Metric] | 500mW | ± 1% | Thin Film | - | - | - | 0ppm/°C to +200ppm/°C | 3.2mm | 1.6mm | 0.5mm | -55°C | 125°C | - | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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LR1206-R50FW
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97K3865 |
Surface Mount Chip Resistor, AEC-Q200 LR Series, 0.5 ohm, 500 mW, 1%, 200 V, 1206 [3216 Metric] RoHS Compliant: Yes TT ELECTRONICS / WELWYN
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0.5ohm | LR Series | 1206 [3216 Metric] | 500mW | ± 1% | Thick Film | 200V | - | General Purpose | ± 100ppm/°C | 3.2mm | 1.6mm | - | -55°C | 150°C | AEC-Q200 | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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RL1220S-R20-F
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28K1616 |
SMD Current Sense Resistor, 0.2 ohm, RL Series, 0805 [2012 Metric], 250 mW, ± 1%, Thin Film SUSUMU
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0.2ohm | RL Series | 0805 [2012 Metric] | 250mW | ± 1% | Thin Film | - | - | - | 0ppm/°C to +200ppm/°C | 2.01mm | 1.25mm | 0.4mm | -55°C | 125°C | - | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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WSLP1206R0100FEA
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84R1939 |
SMD Current Sense Resistor, 0.01 ohm, WSL Series, 1206 [3216 Metric], 1 W, ± 1%, Metal Strip VISHAY
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0.01ohm | WSL Series | 1206 [3216 Metric] | 1W | ± 1% | Metal Strip | - | - | - | ± 75ppm/°C | 3.2mm | 1.6mm | 0.635mm | -65°C | 170°C | AEC-Q200 | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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LRC-LR2010LF-01-R250-F
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88K2573 |
SMD Current Sense Resistor, 0.25 ohm, LRC Series, 2010 [5025 Metric], 1 W, ± 1%, Thick Film TT ELECTRONICS / INTERNATIONAL RESISTIVE
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0.25 | LRC Series | 2010 [5025 Metric] | 1 | ± 1% | Thick Film | - | - | - | ± 100ppm/°C | 5.23 | 2.64 | 0.84 | -55 | 150 | AEC-Q200 | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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WSL2512R2500FEA
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98K3049 |
SMD Current Sense Resistors, AEC-Q200 WSL Series, 0.25 ohm, 1 W, - 1%, 500 mV RoHS Compliant: Yes VISHAY
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0.25ohm | WSL | 2512 [6432 Metric] | 1W | ± 1% | Metal Strip | - | - | - | ± 75ppm/°C | 6.35mm | 3.18mm | 0.635mm | -65°C | 170°C | AEC-Q200 | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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WSL12061L000FEA
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18X4707 |
SMD Current Sense Resistor, 0.001 ohm, WSL Series, 1206 [3216 Metric], 250 mW, ± 1%, Metal Strip VISHAY
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0.001 | WSL Series | 1206 [3216 Metric] | 250 | ± 1% | Metal Strip | - | - | - | ± 275ppm/°C | 3.2 | 1.6 | 0.635 | -65 | 170 | AEC-Q200 | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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LVM25FVR050E-TR
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51AC1070 |
SMD Current Sense Resistor, 0.05 ohm, LVM Series, 2512 [6432 Metric], 1 W, ± 1%, Metal Foil OHMITE
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0.05ohm | LVM Series | 2512 [6432 Metric] | 1W | ± 1% | Metal Foil | - | - | - | ± 50ppm/°C | 6.4mm | 3.2mm | 0.7mm | -55°C | 170°C | - | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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LVM12FTR050E-TR
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51AC1064 |
SMD Current Sense Resistor, 0.05 ohm, LVM Series, 1206 [3216 Metric], 500 mW, ± 1%, Metal Foil OHMITE
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0.05ohm | LVM Series | 1206 [3216 Metric] | 500mW | ± 1% | Metal Foil | - | - | - | ± 100ppm/°C | 3.2mm | 1.6mm | 0.55mm | -55°C | 155°C | - | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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RL73H2AR22FTD
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43AC4015 |
CURRENT SENSE RES, 0R22, 1%, 125 MW TE CONNECTIVITY
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0.22ohm | RL73 | 0805 [2012 Metric] | 125mW | ± 1% | Thick Film | - | - | - | ± 100ppm/°C | 2.01mm | 1.25mm | 0.55mm | -55°C | 155°C | - | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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CSS2H-3920R-L200FE
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67AC7862 |
CURRENT SENSE RES, 200 µOHM, 1%, 12 W BOURNS
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200µohm | CSS2H-3920 | 3921 [1052 Metric] | 12W | ± 1% | Metal Strip | - | - | - | ± 50ppm/°C | 10mm | 5.2mm | 2.5mm | -55°C | 170°C | AEC-Q200 | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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PE1206FRF070R05L
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82AH7700 |
RES, AEC-Q200, 0R05, 1%, 0.25W, 1206 ROHS COMPLIANT: YES YAGEO
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0.05ohm | PE_L Series | 1206 [3216 Metric] | 250mW | ± 1% | Metal Film | - | - | - | ± 100ppm/°C | 3.2mm | 1.6mm | 0.64mm | -55°C | 170°C | AEC-Q200 | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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WSLF2512L5000FEA
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08AJ1731 |
SMD Current Sense Resistor, 500 µohm, WSLF Series, 2512 [6432 Metric], 6 W, ± 1%, Metal Strip VISHAY
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500 | WSLF Series | 2512 [6432 Metric] | 6 | ± 1% | Metal Strip | - | - | - | ± 200ppm/°C | 6.35 | 3.02 | 0.35 | -65 | 170 | AEC-Q200 | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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WSL2512R0100FEB
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14AJ2833 |
RES, 0R01, 1W, 2512, METAL STRIP ROHS COMPLIANT: YES VISHAY
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0.01ohm | WSL | 2512 [6432 Metric] | 1W | ± 1% | Metal Strip | - | - | - | ± 75ppm/°C | 6.35mm | 3.18mm | 0.635mm | -65°C | 170°C | AEC-Q200 | - |