Melexis | US5781LUA-AAA-000-BU

Melexis Microelectronic Integrated Systems designs, manufactures and markets advanced mixed-signal semiconductor devices with core expertise in automotive electronics. Melexis’ capabilities developed in serving automotive segment are sustaining the expansion into Application Specific Standard Products for industrial and consumer applications.

Melexis is an integrated circuits’ supplier that innovates in the area of sensors and programmable sensor systems. Utilizing diverse sets of technologies including Hall Effect,  infrared and MEMS, Melexis offers a variety of sensors including gyroscope, light sensors, Hall Effect sensors and infrared thermometer for contact-less position, speed, current and temperature sensing applications.

US5781 – Medium Sensitivity Unipolar Hall Switch

The Melexis US5781 is a medium magnetic sensitivity unipolar Hall-effect switch designed in mixed signal CMOS technology. The device integrates a voltage regulator, Hall sensor with dynamic offset cancellation system, Schmitt trigger and an open-drain output driver, all in a single package.

The US5781 exhibits unipolar magnetic switching characteristics. Therefore, it operates only with one magnetic pole. The UA (TO-92) package is south pole active - applying a south magnetic pole greater than Bop facing the branded side of the package switches the output ON (Low). The SE (TSOT) package is north pole active - applying a north magnetic pole greater than Bop facing the branded side of the package switches the output ON (Low).

Removing the magnetic field (B->0) switches OFF( High) the output. The use of the opposite magnetic pole facing the branded side does not affect the output state. A magnetic hysteresis Bhyst keeps Bop and Brp separated by a minimal value. The hysteresis prevents output oscillation near the switching point.

The wide operating voltage from 3.5V to 24V, low current  consumption and choice of operating temperature range (-40°C to 85°C and -40°C to 150°C) make the US5781 suitable for automotive and solid state switching applications.

The US5781 is delivered in a 3-lead Thin Small Outline Transistor (TSOT) for surface mount process and in a 3-lead Plastic Single In Line (TO-92 flat) for through-hole mount.

The US5781LUA is a TO-92 Medium Sensitivity Unipolar Hall Switch rated for -40°C to 150°C operating temperature range.