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庫存編號 162-8573
製造零件編號INA219AIDCNR
TWD37.80
個 (在毎卷:3000)
單位
Single 6 V - 100dB 1 Digital 5 mA Surface Mount SOT-23 8 3 x 1.75 x 1.3mm 1.3mm 3mm 5.5 V
RS庫存編號 825-3081
製造零件編號INA213AIDCKR
TWD48.20
/個 (每包:5個)
單位
Single 5 V - 105dB 1 Analogue 5 mA Surface Mount SC-70 6 2.15 x 1.4 x 1mm 1mm 2.15mm 26 V
RS庫存編號 189-8786
製造零件編號MAX4372FESA+
TWD74.20
/個 (每包:5個)
單位
Single 2.7 → 28 V - - 1 Differential 0.06 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS庫存編號 732-7888
製造零件編號MAX4080SASA+
TWD83.00
單位
Single 4.5 → 76 V - 100dB 1 Rail to Rail 0.19 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 76 V
RS庫存編號 922-8241
製造零件編號ZXCT1087E5TA
TWD21.80
個 (在毎卷:3000)
單位
- - - - - - - - - - - - - -
RS庫存編號 798-5012
製造零件編號MAX4377TASA+
TWD68.50
毎管:100 個
單位
Single 3 → 28 V - 90dB 1 - 2.2 mA Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm 28 V
RS庫存編號 191-5163
製造零件編號MAX9919FASA+
TWD79.40
/個 (每包:5個)
單位
Single 4.5 → 5.5 V - 96dB 1 Rail to Rail 2.2 mA Surface Mount SOIC 8 4.98 x 3.99 x 1.58mm 1.58mm 4.98mm 5.5 V
RS庫存編號 189-0235
製造零件編號NCV211RSQT2G
TWD12.10
個 (在毎卷:3000)
單位
Single 5 V - 105dB 1 Rail to Rail 80 μA Surface Mount SC-70 6 2.2 x 1.35 x 1mm 1mm 2.2mm 26 V
RS庫存編號 190-4299
製造零件編號MAX4073TAUT+T
TWD36.60
個 (在毎卷:2500)
單位
Single 3 → 28 V - 90 (Typ.)dB 1 Voltage 1.2 mA Surface Mount SOT-23 6 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS庫存編號 761-9614
製造零件編號LTC6101BCS5#TRMPBF
TWD121.00
單位
Single 4 → 60 V 4 → 60V - 1 Unidirectional 0.64 mA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 60 V
RS庫存編號 738-5131
製造零件編號ZXCT1022E5TA
TWD43.00
/個 (每包:5個)
單位
- - - - - - - - - - - - - -
RS庫存編號 189-8885
製造零件編號MAX4372TEUK+T
TWD75.20
/個 (每包:5個)
單位
Single 2.7 → 28 V - - 1 Differential 0.06 mA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS庫存編號 121-9732
製造零件編號LMP8645HVMKE/NOPB
TWD65.10
個 (在毎卷:250)
單位
Single 2.7 → 12 V - 95dB 1 Single Ended 2700 μA Surface Mount SOT-23 6 3.05 x 1.75 x 1mm 1mm 3.05mm 12 V
RS庫存編號 795-9176
製造零件編號TSC102IPT
TWD42.50
/個 (每包:2個)
單位
Single 2.8 → 30 V - 90dB 1 - 700 μA Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm 4.5mm 5.5 V
RS庫存編號 190-4375
製造零件編號MAX9634TEUK+T
TWD28.90
個 (在毎卷:2500)
單位
Single 1.6 → 28 V - 94dB 1 Voltage 2.5 μA Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS庫存編號 162-8172
製造零件編號INA3221AIRGVT
TWD102.80
個 (在毎卷:250)
單位
Single 2.7 → 5.5 V - 110dB 1 Open Drain 450 μA Surface Mount VQFN 16 4.15 x 4.15 x 0.95mm 0.95mm 4.15mm 5.5 V
RS庫存編號 168-7749
製造零件編號TSC102IPT
TWD18.30
個 (在毎卷:4000)
單位
Single 2.8 → 30 V - 90dB 1 - 700 μA Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm 4.5mm 5.5 V
RS庫存編號 190-6368
製造零件編號MAX4073TAUT+T
TWD64.80
/個 (每包:5個)
單位
Single 3 → 28 V - 90 (Typ.)dB 1 Voltage 1.2 mA Surface Mount SOT-23 6 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS庫存編號 779-9482
製造零件編號LT1787CS8#PBF
TWD189.00
/個 (每包:2個)
單位
Single 36 V - - 1 Bidirectional, Unidirectional 60 μA Surface Mount SOIC 8 5.004 x 3.988 x 1.498mm 1.498mm 5mm 36 V
RS庫存編號 919-9358
製造零件編號LT6106CS5#TRMPBF
TWD51.70
個 (在毎卷:500)
單位
Single 36 V - - 1 - 0.13 mA Surface Mount TSOT-23 5 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm 36 V