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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Omschrijving Prijs 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-stocknr. 189-7306
FabrikantnummerMAX4173FEUT+T
FabrikantMaxim Integrated
€ 1,479
Each (On a Reel of 2500)
Aantal stuks
Single 3 → 28 V - 90dB 1 - 1 mA Surface Mount SOT-23 6 3 x 1.75 x 1.3mm 1.3mm 3mm 28 V
RS-stocknr. 190-4309
FabrikantnummerMAX4081TAUA+
FabrikantMaxim Integrated
€ 1,784
Each (In a Tube of 50)
Aantal stuks
Single 4.5 → 76 V - 100dB 1 Voltage 190 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 76 V
RS-stocknr. 190-6329
FabrikantnummerMAX4373FEUA+T
FabrikantMaxim Integrated
€ 1,958
Each (In a Pack of 5)
Aantal stuks
Single 2.7 → 28 V - 85 (Typ.)dB 1 Voltage 100 μA Surface Mount μMAX 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 28 V
RS-stocknr. 162-7736
FabrikantnummerLMP8640HVMKE-F/NOPB
€ 1,309
Each (On a Reel of 250)
Aantal stuks
Dual - ±12 V, ±2.7 V, ±5 V 103dB 1 Buffered 800 μA Surface Mount SOT-23 6 3.05 x 1.75 x 1mm 1mm 3.05mm 12 V
RS-stocknr. 189-9253
FabrikantnummerMAX4070AUA+
FabrikantMaxim Integrated
€ 1,924
Each (In a Pack of 5)
Aantal stuks
Single 2.7 → 24 V - 100dB 1 Rail to Rail 0.25 mA Surface Mount μMAX 8 3.05 x 3.05 x 0.95mm 0.95mm 3.05mm 24 V
RS-stocknr. 189-7273
FabrikantnummerMAX4070AUA+
FabrikantMaxim Integrated
€ 1,523
Each (In a Tube of 50)
Aantal stuks
Single 2.7 → 24 V - 100dB 1 Rail to Rail 0.25 mA Surface Mount μMAX 8 3.05 x 3.05 x 0.95mm 0.95mm 3.05mm 24 V
Nieuw
RS-stocknr. 212-2553
FabrikantnummerMAX40204ANA+T
FabrikantMaxim Integrated
€ 1,492
Each (In a Pack of 5)
Aantal stuks
Single 5.5 V 36V 110dB 2 Bidirectional - - 8-Bump WLP 8 - - - -
Nieuw
RS-stocknr. 212-2552
FabrikantnummerMAX40204ANA+T
FabrikantMaxim Integrated
€ 0,998
Each (On a Reel of 5000)
Aantal stuks
Single 5.5 V 36V 110dB 2 Bidirectional - - 8-Bump WLP 8 - - - -