Current Sensing Amplifiers

Current sensing amplifiers measure current by outputting a voltage that is proportional to the flowing power current. A resistor is used to convert the load current to a small voltage which is then accurately amplified. They offer real-time overcurrent protection.

What are the different applications of current sensing amplifiers?

Accurate current sensing is crucial to optimising performance in a range of applications, such as motor control and power management. In devices where battery or power-line monitoring is highly necessary, like laptops and phones, current sensing amplifiers are critical.

How to choose the right type of current sensing amplifier

There are several factors that will determine the the type of amplifier you choose, including whether the measurement will be on the high or low side. The sense resistor can be placed either between the supply voltage and load, or between the load and ground. The former is called high-side seinsing, whereas the latter is called low-side sensing. High voltage current sensing amplifiers offer input ranges up to +76V and down to -20V, ideal for applications such as motor control and network routers. Low power current sensing amplifiers help to maximise and extend battery life.


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Description Price Power Supply Type Typical Single Supply Voltage Typical Dual Supply Voltage Minimum CMRR Number of Channels per Chip Output Type Maximum Supply Current Mounting Type Package Type Pin Count Dimensions Height Length Maximum Operating Supply Voltage
RS Stock No. 922-8238
Mfr. Part No.ZXCT1107SA-7
HK$5.345
Each (On a Reel of 3000)
units
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RS Stock No. 738-5272
Mfr. Part No.ZXCT1107SA-7
HK$9.192
Each (In a Pack of 5)
units
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RS Stock No. 922-7617
Mfr. Part No.ZXCT1009FTA
HK$4.862
Each (On a Reel of 3000)
units
- 2.5 → 20 V - - - - - Surface Mount SOT-23 3 3.05 x 1.4 x 1mm 1mm 3.05mm -
RS Stock No. 154-920
Mfr. Part No.ZXCT1009FTA
HK$10.596
Each (In a Pack of 5)
units
- 2.5 → 20 V - - - - - Surface Mount SOT-23 3 3.05 x 1.4 x 1mm 1mm 3.05mm -
RS Stock No. 922-8232
Mfr. Part No.ZXCT1109SA-7
HK$3.90
Each (On a Reel of 3000)
units
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RS Stock No. 738-5276
Mfr. Part No.ZXCT1109SA-7
HK$9.192
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 162-6300
Mfr. Part No.LMP8601MA/NOPB
HK$41.167
Each (In a Tube of 95)
units
Single 5 V - 80dB 1 Bidirectional, Differential, Rail to Rail, Unidirectional 1.3 mA Surface Mount SOIC 8 4.9 x 3.9 x 1.45mm 1.45mm 4.9mm 5.5 V
RS Stock No. 761-6328
Mfr. Part No.LMP8601MA/NOPB
HK$48.53
Each
units
Single 5 V - 80dB 1 Bidirectional, Differential, Rail to Rail, Unidirectional 1.3 mA Surface Mount SOIC 8 4.9 x 3.9 x 1.45mm 1.45mm 4.9mm 5.5 V
RS Stock No. 921-2940
Mfr. Part No.INA282AID
HK$41.167
Each (In a Tube of 75)
units
Single 2.7 → 18 V - 120dB 1 Bidirectional 900 μA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 18 V
RS Stock No. 919-9881
Mfr. Part No.LT6106HS5#TRMPBF
HK$17.57
Each (On a Reel of 500)
units
Single 2.7 → 36 V - - 1 - 115 μA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 36 V
RS Stock No. 786-9727
Mfr. Part No.LT6106HS5#TRMPBF
HK$30.174
Each (In a Pack of 5)
units
Single 2.7 → 36 V - - 1 - 115 μA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 36 V
RS Stock No. 817-6603
Mfr. Part No.INA282AID
HK$48.534
Each (In a Pack of 5)
units
Single 2.7 → 18 V - 120dB 1 Bidirectional 900 μA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 18 V
RS Stock No. 738-5279
Mfr. Part No.ZXCT1087E5TA
HK$16.556
Each (In a Pack of 5)
units
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RS Stock No. 922-3344
Mfr. Part No.XTR111AIDGQT
HK$15.954
Each (On a Reel of 250)
units
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RS Stock No. 461-6558
Mfr. Part No.INA139NA/250
HK$27.48
Each
units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - 100dB 1 - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 1.15mm 2.9mm 40 V
RS Stock No. 100-3849
Mfr. Part No.INA139NA/250
HK$18.244
Each (On a Reel of 250)
units
Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V - 100dB 1 - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 1.15mm 2.9mm 40 V
RS Stock No. 730-0556
Mfr. Part No.INA219BIDCNT
HK$31.01
Each
units
- - - - - - - Surface Mount SOT-23 8 3 x 1.75 x 1.3mm 1.3mm 3mm -
RS Stock No. 822-5844
Mfr. Part No.LT1999IMS8-20#PBF
HK$58.965
Each (In a Pack of 2)
units
Single 4.5 → 5.5 V - 80dB 1 Buffered, Rail to Rail 7.1 mA Surface Mount MSOP 8 3 x 3 x 0.9984mm 0.998mm 3mm 5.5 V
RS Stock No. 122-0319
Mfr. Part No.ZXCT1110W5-7
HK$4.154
Each (On a Reel of 3000)
units
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RS Stock No. 738-5285
Mfr. Part No.ZXCT1110W5-7
HK$9.994
Each (In a Pack of 5)
units
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