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Allegro intros Hall-effect switches, latches

Posted: 24 Feb 2009 ?? ?Print Version ?Bookmark and Share

Keywords:switches Hall-effect? stress thermal? latches repeatability?

Allegro MicroSystems Europe has introduced a new family of Hall-effect switches and latches, which offer switching repeatability through their resistance to temperature variations and thermal stresses.

The new A1120, A1220 and A1221 are suited to operation over extended temperature ranges up to +150C. They are available in two different package styles, which offer a magnetically optimized configuration for a variety of automotive, industrial and consumer applications.

The A1220 and A1221 devices are typically used to detect the speed and direction of ring magnets in motorcommutation applications, while the A1120 is most commonly used to detect the end position in automotive wiper systems and multiple discrete positions in shift selectors.

The superior high-temperature performance of the new family is made possible through dynamic offset cancellation, which reduces the residual offset voltage normally caused by device overmoulding, temperature dependencies and thermal stress.

Each device includes, on a single silicon chip, a voltage regulator, a Hall-voltage generator, a small-signal amplifier, chopper stabilization circuitry, a Schmitt trigger and a short-circuit protected open-collector output that can sink up to 25mA.

The on-board regulator permits operation with supply voltages from 3V to 24V, although significant advantages are realized by reducing the minimum operating voltage. In particular, it allows these devices to be used in 3V applications; alternatively, additional external resistance can be added in series with the supply pin for greater protection against transient events.

Output short-circuit protection, reverse battery protection and ESD protection to 3kV HBM (Human Body Model) are also incorporated.

The new products are available in two package styles. Package type LH is a modified SOT23W, surface mount package, while the UA package is a 3-lead, ultramini-SIP for through-hole mounting. Each package type is available in Pb-free form (suffix, -T), with a 100 percent matt tin-plated lead frame.

- Henri Arnold
EE Times Europe





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