ACS761: 12 V High-Side Hot-Swap Hall Effect Based Current Monitor


This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available. Date of status change: June 1, 2015.

The ACS761 combines Allegro Hall-effect current sense technology with a hot-swap controller resulting in a more efficient integrated controller for 12 V applications. By eliminating the need for a shunt resistor, the I2R losses in the power path are reduced.

When the ACS761 is externally enabled, and the voltage rail is above the internal UVLO threshold, the internal charge pump drives the gate of the external FET. When the load voltage reaches its target value PGOOD is asserted high. When a fault is detected, the gate is disabled while simultaneously alerting the application that a fault has occurred.

The integrated protection in the ACS761 incorporates three levels of fault protection, which includes a Power Fault with user-selectable delay, an Overcurrent Fault threshold with userselectable delay, and short circuit protection, which disables the gate in less than 2 µs. These faults are indicated to the host system via the Fault pin and are cleared upon reasserting enable high.

Minimum Order Value: Estimated annual volume must be > 100,000 units.

Top Features

  • Hall-effect current monitor—no external sense resistor required
  • PGOOD and PGOOD indication
  • Analog output voltage (factory trimmed for gain and offset) proportional to applied current
  • External high-side FET gate drive
  • 240V*A power fault protection with user-selectable delay
  • Overcurrent fault protection with user-selectable delay
  • Fault protection isolates failed supply from output in <2 µs
  • 1.5 mΩ internal conductor resistance
  • Active low latched Fault indicator output signal
  • User controlled soft start / hot-swap function
  • Logic enable input pin
  • 10.8 to 13.2 V, single-supply operation
  • 2 kV ESD protection for all pins

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
ACS761ELFTR-20B-T 24-lead QSOP -40°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.


The ACS761 is supplied in a 24-pin QSOP surface mount package (suffix LF).

LF QSOP 24 leads