A1244 Chopper-Stabilized, Two-Wire Hall-Effect Latch FEATURES AND BENEFITS DESCRIPTION AEC-Q100 automotive qualified The A1244 is a two-wire Hall-effect latch. The devices are High-speed, 4-phase chopper stabilization produced on the Allegro advanced BiCMOS wafer fabrication Low switchpoint drift throughout temperature range process, which implements a high-frequency, 4-phase, Low sensitivity to thermal and mechanical stresses chopper stabilization technique. This technique achieves On-chip protection magnetic stability over the full operating temperature range, Supply transient protection and eliminates offsets inherent in devices with a single Hall Reverse-battery protection element that are exposed to harsh application environments. On-board voltage regulator Two-wire latches are particularly advantageous in cost-sensitive 3 to 24 V operation applications because they require one less wire for operation Solid-state reliability versus the more traditional open-collector output switches. Robust EMC and ESD performance Additionally, the system designer inherently gains diagnostics Industry-leading ISO 7637-2 performance through use of because there is always output current flowing, which should proprietary, 40 V clamping structures be in either of two narrow ranges. Any current level not within these ranges indicates a fault condition. PACKAGES: The Hall-effect latch will be in the high output current state 3-pin ultra-mini SIP 3-pin SOT23-W in the presence of a magnetic south polarity field of sufficient 1.5 mm 4 mm 3 mm 2 mm 3 mm 1 mm magnitude and will remain in this state until a sufficient north (suffix UA) (suffix LH) polarity field is present. The device is offered in two package styles. The LH is a SOT-23W style, miniature low-profile package for surface- mount applications. The UA is a 3-pin ultra-mini single inline package (SIP) for through-hole mounting. Both packages are lead (Pb) free, with 100% matte-tin leadframe plating. Approximate footprint Not to scale Functional Block Diagram V+ VCC Regulator To all subcircuits Clock/Logic 0.01 F Low-Pass Schmitt Filter Trigger Amp Polarity GND GND UA package only A1244-DS, Rev. 3 May 19, 2017 Dynamic Offset Cancellation Sample and HoldChopper-Stabilized, Two-Wire A1244 Hall-Effect Latch SELECTION GUIDE Operating Ambient Supply Current 1 Part Number Packing Package Temperature, T at I A CC(L) (C) (mA) A1244LLHLT-I1-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 40 to 150 5 to 6.9 A1244LLHLX-I1-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount 40 to 150 5 to 6.9 A1244LLHLT-I2-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount 40 to 150 2 to 5 A1244LLHLX-I2-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount 40 to 150 2 to 5 A1244LUA-I1-T Bulk, 500 pieces/bag 3-pin SIP through hole 40 to 150 5 to 6.9 A1244LUA-I2-T Bulk, 500 pieces/bag 3-pin SIP through hole 40 to 150 2 to 5 1 Contact Allegro for additional packing options. ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Notes Rating Unit 2 Forward Supply Voltage V 28 V CC Reverse Supply Voltage V 18 V RCC Magnetic Flux Density B Unlimited G Operating Ambient Temperature T Range L 40 to 150 C A Maximum Junction Temperature T (max) 165 C J Storage Temperature T 65 to 170 C stg 2 This rating does not apply to extremely short voltage transients such as Load Dump and/or ESD. Those events have individual ratings, specific to the respective transient voltage event. Pinout Diagrams Terminal List Table Number Name Function 3 LH UA VCC 1 1 Connects power supply to chip NC 2 No connection GND 3 2, 3 Ground NC 1 2 3 1 2 LH Package UA Package 3-pin SOT23W 3-pin SIP Allegro MicroSystems, LLC 2 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000 www.allegromicro.com