Switches, Relays & Onboard
Allegro MicroSystems Europe – High-performance unipolar switch goesSep 16 2005 - Switches, Relays & Onboard [More Switches, Relays & Onboard Articles]
New unipolar Hall-effect switches which offer improved performance compared
with earlier devices and a wider variety of packaging options, including a
version with lead (Pb) free plating, have been introduced by Allegro
The A110x family, produced with BiCMOS technology, is intended to replace
the company´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. Novel 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 3.8V to 24V.
Extensive on-board protection circuitry makes possible a ±30V 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 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).More news from Allegro micro-2005