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A3423 Dataheets PDF



Part Number A3423
Manufacturers Allegro
Logo Allegro
Description Dual Channel Hall Effect Direction Detection Sensor
Datasheet A3423 DatasheetA3423 Datasheet (PDF)

A3423 Dual Channel Hall Effect Direction Detection Sensor IC This device is in production, however, it has been deemed Pre-End of Life. The product is approaching end of life. Within a minimum of 6 months, the device will enter its final, Last Time Buy, order phase. Date of status change: June 3, 2013 Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to the A1233. NOTE: For detailed information on purchasing options, contact your .

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A3423 Dual Channel Hall Effect Direction Detection Sensor IC This device is in production, however, it has been deemed Pre-End of Life. The product is approaching end of life. Within a minimum of 6 months, the device will enter its final, Last Time Buy, order phase. Date of status change: June 3, 2013 Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to the A1233. NOTE: For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. Allegro MicroSystems, LLC reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. Free Datasheet http://www.Datasheet4U.com A3423 Dual Channel Hall Effect Direction Detection Sensor IC Features and Benefits ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ 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 Description 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 A3423 is a highly sensitive, temperature-stable magnetic device 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 device 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 (the SOIC version is currently in development). Both packages are lead (Pb) free, with 100% matte tin leadframe plating. Packages 8-pin SOIC (suffix L) 4-pin SIP (suffix K) Not to scale Functional Block Diagram L package only Output Current Limit Regulator Power-on Logic OUTA VCC E1 Direction Logic Output Current Limit DIR Trim E2 Output Current Limit SPD Output Current Limit OUTB GND L package only A3423-DS, Rev. 5 Free Datasheet http://www.Datasheet4U.com A3423 Dual Channel Hall Effect Direction Detection Sensor IC Selection Guide Part Number A3423EK-T A3423ELTR-T A3423LK-T Package 4-pin through hole SIP 8-pin surface mount SOIC2 4-pin through hole SIP Packing1 Bulk bag, 500 pieces/bag Tape and reel, 3000 pieces/reel Bulk bag, 500 pieces/bag Tape and reel, 3000 pieces/reel TA (°C) –40 to 85 –40 to 150 A3423LLTR-T 8-pin surface mount SOIC2 1Contact Allegro for additional packing options. 2SOIC package currently in development. Absolute Maximum Ratings Characteristic Supply Voltage Reverse Battery Voltage Output Off Voltage Output Sink Current Magnetic Flux Density Operating Ambient Temperature Storage Temperature Maximum Junction Temperature Symbol VCC VRB VOUT IOUT(SINK) B TA Tstg TJ(max) Range E Range L –40°C to 150°C Notes Rating 30 –30 VCC 30 Unlimited –40 to 85 –40 to 150 –65 to 165 165 Units V V V mA G ºC ºC ºC ºC Pin-out Diagrams Terminal List Table Number K L 1 2 3 4 5 6, 7 8 VCC DIR OUTA SPD OUTB NC GND Input power supply; tie to GND with bypass capacitor Output signal indicating direction of target movement Analog output indicating B at E1 Hall element Output signal indicating speed of target movement Analog output indicating B at E2 Hall element No connection Ground connection 1 2 – 3 – – GND Name Description VCC DIR OUTA SPD 1 2 3 4 8 GND 7 NC 6 NC 5 OUTB 1 VCC 2 DIR 3 SPD 4 4 L Package K Package Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 Free Datasheet http://www.Datasheet4U.com A3423 Dual Channel Hall.


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