A1126 Chopper-Stabilized Omnipolar Hall-Effect Switch DESCRIPTION FEATURES AND BENEFITS AEC-Q100 automotive qualified The A1126 integrated circuit is an omnipolar, ultrasensitive Omnipolar operation Hall-effect switch with a digital output. This device has an Low switchpoint drift integrated regulator permitting operation to 24 V. Superior temperature stability This device is especially suited for operation through extended Insensitive to physical stress temperature ranges, up to 150C. Superior high-temperature Reverse-battery protection performance is made possible through a dynamic offset Robust EMC capability cancellation technique, which reduces the residual offset Robust ESD protection voltage normally caused by device overmolding, temperature excursions, and thermal stress. PACKAGES: The A1126 Hall-effect switch includes the following on a Not to scale single silicon chip: voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a short-circuit-protected open-drain output. Advanced BiCMOS wafer fabrication processing is used to take advantage of low-voltage requirements, component matching, very low NOT FOR input-offset errors, and small component geometries. NEW DESIGN The omnipolar operation of the A1126 allows activation with either a north or a south polarity field of sufficient strength. In the absence of a magnetic field, the output is off. This patented 3-pin SOT23W (suffix LH) magnetic-polarity-independence feature makes this device 3-pin SIP, 3-pin SIP, an excellent replacement for reed switches, with improved matrix HD style chopper style ease of manufacturing, because the A1126 does not require (suffix UA) (suffix UA) Continued on the next page Functional Block Diagram VOUT VCC To all subcircuits Regulator Omnipolar Control Switchpoints Signal Current Amplifier Recovery Limit GND A1126-DS, Rev. 3 October 28, 2016 Dynamic Offset CancellationA1126 Chopper-Stabilized Omnipolar Hall-Effect Switch DESCRIPTION (CONTINUED) manufacturers to orient their magnets. These devices allow simple a miniature low-profile surface-mount package, while package on/off switching in industrial, consumer, and automotive applications. UA is a three-lead ultra-mini SIP for through-hole mounting. Each package is lead (Pb) free, with 100% matte-tin-plated leadframe. The A1126 is rated for operation between the ambient temperatures 40C to 150C. The available package styles provide magnetically optimized solutions for most applications. Package LH is an SOT23W, SELECTION GUIDE 1 Part Number Packing Package 2 A1126LLHLT-T 3,000 pieces per reel 3-pin SOT-23W surface mount A1126LLHLX-T 10,000 pieces per reel 3-pin SOT-23W surface mount 3 A1126LUA-T 500 pieces per bag 3-pin ultramini SIP through-hole mount 1 Contact Allegro for additional packing options 2 Available through authorized Allegro distributors only. 3 The chopper-style UA package is not for new design the matrix HD style UA package is recommended for new designs. ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Notes Rating Unit Forward Supply Voltage V 28 V CC Reverse Supply Voltage V 18 V RCC Output Off Voltage V 28 V OUT Reverse Supply Current I 2 mA RCC Continuous Output Current I Internally limited OUT Operating Ambient Temperature T L temperature range 40 to 150 C A Maximum Junction Temperature T (max) 165 C J Storage Temperature T 65 to 170 C stg Pinout Diagrams 3 Terminal List Table Number Name Function LH UA VCC 1 1 Connects power supply to chip VOUT 2 3 Output from circuit GND 3 2 Ground 1 2 1 2 3 LH Package UA Package 3-Pin SOT23W 3-Pin SIP 2 Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com