A1101EUA-T-Continuous-Time Switch Family

Description

The Allegro® A1101-A1104 and A1106 Hall-effect switches 

are next generation replacements for the popular Allegro 

312x and 314x lines of unipolar switches. The A110x family, 

produced with BiCMOS technology, consists of devices that 

feature fast power-on time and low-noise operation. Device 

programming is performed after packaging, to ensure increased 

switchpoint accuracy by eliminating offsets that can be induced 

by package stress. Unique Hall element geometries and lowoffset amplifiers help to minimize noise and to reduce the 

residual offset voltage normally caused by device overmolding, 

temperature excursions, and thermal stress.

The A1101-A1104 and A1106 Hall-effect switches include 

the following on a single silicon chip: 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. The extensive 

on-board protection circuitry makes possible a ±30 V absolute 

maximum voltage rating for superior protection in automotive 

and industrial motor commutation applications, without adding 

Features and Benefits

? Continuous-time operation

? Fast power-on time

? Low noise

? Stable operation over full operating temperature range

? Reverse battery protection

? Solid-state reliability

? Factory-programmed at end-of-line for optimum 

performance

? Robust EMC performance 

? High ESD rating 

? Regulator stability without a bypass capacitor

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