New from Allegro MicroSystems Europe is the A1244 is a two-wire Hall-effect latch featuring on-chip transient protection and a Zener clamp to protect against overvoltage conditions on the supply line.
The new device, which is programmed at the factory to optimise the magnetic switch point accuracy, uses the same patented high-frequency, 4-phase, chopper-stabilisation technique that is used on the company’s complementary family of unipolar switches. This results in lower noise on the output, less switch-point variation over temperature and faster settling times.
The improvement in noise and switch-point drift allows the device to realise much better switching accuracy, which means better switching repeatability. Moreover, the improved high-voltage transient protection allows the A1244 to survive the conditions specified in ISO 7637-2 and 40V load dump.
Allegro’s advanced BiCMOS wafer fabrication process is used to achieve magnetic stability over temperature and to eliminate the offset inherent in single-element devices when exposed to harsh application environments.