Worcester, Mass. Allegro MicroSystems Inc. has introduced a dual-channel Hall-effect sensor suitable for use in speed and direction sensing applications incorporating encoder ring magnet targets. The A3423 provides output signals that indicate speed and direction of the target.
The A3423 device is highly sensitive and temperature stable making it suitable for use in harsh automotive and industrial environments. The Hall elements of the A3423 are spaced 1.63-mm apart, which provides for excellent speed and direction information for small-geometry targets, said Allegro. In addition, the Hall elements are both photo lithographically aligned to better than 1 micron. Maintaining accurate mechanical location between the two active Hall elements eliminates the major manufacturing hurdle encountered in fine-pitch detection applications, added the company.
Extremely low-drift amplifiers guarantee symmetry between the switches to maintain signal quadrature. An on-chip regulator allows the use of this device over a wide operating voltage range of 3.8 to 24.0 V, and end-of-line trimming of the Hall element switchpoints provides for tight matching capability. The continuous-time method of offset cancellation delivers a fast start-up and signal recognition as well as very low noise on the output.
In addition, the Hall-effect sensor requires fewer external components for protection against faults, transients and electrostatic discharge (ESD).
Pricing: $1.78 in quantities of 1,000.
Delivery: 14-week delivery ARO.
Product information: Allegro A3423
Allegro MicroSystems, Inc., 1-508-853-5000, www.allegromicro.com