The Allegro A1333 and A1339 devices feature a system-on-a-chip (SoC) architecture that includes a CVH front end, digital signal processing, and support for multiple digital output formats, including Allegro's first motor switching outputs (UVW) and encoder outputs (A, B, I) for angle sensor ICs that can operate at 3.3 V or 5 V.
The A1333 and A1339 models are offered in single- and dual-array versions for systems requiring redundant sensors. Both include on-chip EEPROM technology, capable of supporting up to 100 read/write cycles, for flexible end-of-line calibration parameter programming. These devices are ideal for automotive applications requiring angle measurements from 0° to 360°, such as motor position measurements for steering and braking systems, and other high-speed actuators for pumps and transmissions that require low latency and high resolution. The A1339 also includes an integrated revolution counter and low-power mode features that allow it to track changes in the target magnetic field in automotive applications, even when the vehicle is in the "key off" state.
Both the single- and dual-array A1333 and A1339 devices were designed in accordance with the ISO 26262:2011 requirements for hardware development (assessment pending). The single-pill versions were designed to meet ASIL B requirements, and the dual-pill products were designed to meet ASIL D requirements when integrated and used in conjunction with appropriate system level control. The stackable nature of the dual-pill assembly provides better channel-to-channel matching than more traditional side-by-side mounting techniques. This is a key parameter for safety-critical applications where the output of the two sensors is compared to ensure the system operates safely.

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