Melexis | US1881LUA-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.

US1881 - High Sensitivity Hall Latch

The Melexis US1881 is a high magnetic sensitivity Hall-effect latch 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 US1881 exhibits latch magnetic switching characteristics. Therefore, it requires both south and north poles to operate properly. The device behaves as a latch with symmetric operating and release switching points (Bop=|Brp|). This means magnetic fields with equivalent strength and opposite direction drive the output OFF (High) and ON (Low).

Removing the magnetic field (B->0) keeps the output in its previous state. This latching property defines the device as a magnetic memory. A magnetic hysteresis Bhyst keeps Bop and Brp separated by a minimal value. This 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, -40°C to 125°C, and -40°C to 150°C) make the US1881 suitable for automotive, industrial and consumer applications. The output signal is open-drain type. Such output allows simple connectivity with TTL or CMOS logic by using a pull-up resistor tied between a pull-up voltage and the device output.

The US1881 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 US1881LUA is a TO-92 High Sensitivity Hall Latch rated for -40°C to 150°C operating temperature range.