What this current sense amplifier does on your board
The MAX4377FAUA+T is a dual-channel current sense amplifier from Analog Devices, designed to measure current by sensing the voltage drop across an external shunt resistor. It delivers a 2 MHz -3dB bandwidth and a 10V/µs slew rate, which means it can track fast current transients in switching power supplies, motor drives, and solenoid drivers without significant lag. The part operates from a single 3 V to 28 V supply, drawing only 1 mA per channel, so it fits into both low-power and high-side sensing applications without a separate regulator. The 8-uMAX/uSOP package is a small surface-mount footprint, suitable for dense PCB layouts.
A 10V/µs slew rate means the amplifier output can swing 10 V in one microsecond. For a current sense amplifier, that translates to how fast it can report a fault condition like an overcurrent or short circuit. If your controller needs to shut down a MOSFET within a few microseconds of a fault, this part keeps up. The 2 MHz bandwidth sets the upper frequency of current signals it can accurately reproduce — useful for sensing ripple current in a buck converter or detecting fast load steps. Together, these specs tell you the MAX4377FAUA+T is not a slow, general-purpose op-amp; it is built for real-time current monitoring in power electronics.
Supply range and quiescent current — fitting into the power budget
The 3 V to 28 V supply span covers common rails. Each channel draws 1 mA quiescent current, so the dual amplifier totals 2 mA.
It is a surface-mount part, so it goes through reflow — no socket, no hand-soldering unless you have a steady hand and a fine tip. On site, if you are swapping this in a repair, you will want a hot-air station or a soldering iron with a fine chisel tip. No lab bench required, but a steady hand helps.
Lifecycle and sourcing — active and available
The ROHS3 compliance means it meets current environmental regulations for lead-free assembly. Sourcing is straightforward: we can quote this against an RFQ with current pricing and availability confirmed at the time of your request. If you need a dual current sense amplifier in an 8-uMAX package with similar bandwidth and supply range, this is the part to specify into your BOM.