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 Unipolar switch family offers high performance and new packaging
options including lead-free plating
Allegro MicroSystems Europe has introduced a new family of unipolar
Hall-effect switches which not only offer improved performance compared with
earlier devices but also to offer a wider variety of packaging options
including a version with lead (Pb) free plating.
The new A110x family, produced with BiCMOS technology, is intended to
replace Allegro’s legacy A314x and A312x families of unipolar Hall-effect
switches, and includes five devices (A1101/02/03/04/06) with fast power-on
time and low noise operation.
Device programming is performed after packaging to ensure increased
switch-point accuracy by eliminating offsets that can be induced by package
stress. Unique Hall-element geometries and low-offset amplifiers help to
minimise noise and reduce the residual offset voltage normally caused by
device overmoulding, temperature excursions and thermal stress.
Each device in the family incorporates, on a single silicon chip, a voltage
regulator, Hall-voltage generator, small-signal amplifier, Schmitt trigger,
and NMOS output transistor. The integrated voltage regulator permits
operation from 3.8 to 24 V.
Extensive on-board protection circuitry makes possible a ±30 V absolute
maximum voltage rating, which provides superior protection in automotive and
industrial motor commutation applications without the need to add any
external components. All devices in the family are identical except for
magnetic switch points.
New packaging options offer customers a wider choice of design
configurations, while an extended temperature range version is available for
automotive and industrial applications.
The A110x family of devices are available in a 3-pin single in-line package
(UA) or a three-pin surface-mount package (LH).
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