A3423: Dual Channel Hall Effect Direction Detection Sensor IC

These parts are discontinued. Samples are no longer available. Date of status change: June 2, 2014.

Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to the A1233LK-T.

The A3423 is a dual-channel Hall-effect sensor IC ideal for use in speed and direction sensing applications incorporating encoder ring-magnet targets. The A3423 provides various output signals that indicate speed and direction of target rotation. The Hall elements are both photolithographically aligned to better than 1 µm. Maintaining accurate displacement between the two active Hall elements eliminates the major manufacturing hurdle encountered in fine-pitch detection applications. The sensor ICs are highly sensitive, temperature-stable magnetic sensor ICs ideal for use in harsh automotive and industrial environments.

The Hall elements of the A3423 are spaced 1.63 mm apart, which provides excellent speed and direction information for small-geometry targets. 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 V.

End-of-line trimming of the Hall element switchpoints provides tight matching capability. The continuous-time nature of the Hall elements delivers a fast start-up of the sensor and low noise.

The A3423 has integrated protection against transients on the supply and output pins and short-circuit protection on all outputs.

The A3423 is available in a 4-pin SIP and a plastic 8-pin SOIC surface mount package. Both packages are lead (Pb) free, with 100% matte tin leadframe plating.

DATASHEETS
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Phone: 540-548-4979
Web: www.respinsales.com
Email: ronid@respinsales.com

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  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • Precisely aligned dual Hall elements
  • Tightly matched magnetic switchpoints
  • Speed and direction outputs
  • Individual Hall element outputs (L package)
  • Fast power-on time
  • Output short circuit protection
  • Operation from an unregulated power supply
  • Wide operating temperature range
  • Wide operating voltage range
  • Integrated EMC-ESD protection

The A3423 is available in a 4-pin SIP and a plastic 8-pin SOIC surface mount package. Both packages are lead (Pb) free, with 100% matte tin leadframe plating.

K-SIP and L-SOIC combined

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Product Image Functional Block Diagram

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A3423EK-T 4-lead SIP -40°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Check stock
A3423ELTR-T 8-lead SOIC -40°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Check stock
A3423LK-T 4-lead SIP -40°C to 150°C Yes View Data Discontinued Contact your
local sales rep
Check stock
A3423LLTR-T 8-lead SOIC -40°C to 150°C Yes View Data Discontinued Contact your
local sales rep
Check stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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