A1156 Datasheet | Allegro MicroSystems

FEATURES AND BENEFITS - AEC-Q100 automotive qualified - High-speed, 4-phase chopper stabilization - Low switchpoint drift throughout temperature range - Low sensitivity to thermal and mechanical stresses - On-chip protection - Supply transient protection - Reverse-battery protection - On-board voltage regulator - 3 to 24 V operation - Solid-state reliability - Robust EMC and ESD performance - Industry-leading ISO 7637-2 performance through use of proprietary, 40 V clamping structures Continued on the next page… PACKAGES 3-pin SOT23-W 2 mm × 3 mm × 1 mm (suffix LH) 3-pin ultramini SIP 1.5 mm × 4 mm × 3 mm (suffix UA) 2-pin ultramini SIP 1.5 mm × 4 mm × 4 mm (suffix UB) Approximate footprint DESCRIPTION The A1150, A1152, A1153, A1155, A1156, A1157, and A1158 prise a family of two-wire, unipolar, Hall-effect switches, which are factory-trimmed to optimize magnetic switchpoint accuracy.These devices are produced on the Allegro™ advanced Bi CMOS wafer fabrication process, which implements a high-frequency, 4-phase, chopper-stabilization technique. This technique achieves magnetic stability over the full operating temperature range, and eliminates offsets inherent in devices with a single Hall element that are exposed to harsh application environments. The A115x family has a number of automotive applications. These include sensing seat track position, seat belt buckle presence, hood/trunk latching, and shift selector position. Two-wire unipolar switches are particularly advantageous in cost-sensitive applications because they require one less wire for operation versus the more traditional open-collector output switches. Additionally, the system designer inherently gains diagnostics because there is always output current flowing, which should be in either of two narrow ranges. Any current level not within these ranges indicates a fault condition. All family members are offered in three package styles. The LH is a SOT-23W style, miniature, low profile package for...