A1333: Precision, High Speed, Hall-Effect Angle Sensor IC with Integrated Diagnostics for Safety-Critical Applications


The A1333 is a 360° angle sensor IC that provides contactless, low latency, high-resolution angular position information based on magnetic Circular Vertical Hall (CVH) technology. It has a system-onchip (SoC) architecture that includes: a CVH front end, digital signal processing, and motor commutation (UVW) or encoder outputs (A, B, I). It also includes on-chip EEPROM technology, capable of supporting up to 100 read/write cycles, for flexible end-of-line programming of calibration parameters.

The A1333 is ideal for automotive applications requiring 0° to 360° angle measurements, such as electronic power steering (EPS), rotary PRNDLs, and throttle systems.

The A1333 supports customer integration into safety-critical applications.

The A1333 is available in a dual-die 24-pin eTSSOP and a single-die 14-pin TSSOP package. The packages are lead (Pb) free with 100% matte-tin leadframe plating.

ASIL Logo 

A1333 was developed in accordance with ISO 26262:2011 as a hardware safety element out of context. The single die was designed to meet ASIL B capability (pending assessment), and the dual die was designed to meet ASIL D capability (pending assessment), for use in automotive safety-related systems when integrated and used in the manner prescribed in the applicable safety manual and datasheet. 

Top Features

  • Contactless 0° to 360° angle sensor IC, for angular position, rotational speed, and direction measurement
    • Capable of sensing magnet rotational speeds targeting 12b effective resolution with 900 G field
    • Circular Vertical Hall (CVH) technology provides a single channel sensor system supporting operation across a wide range of air gaps
  • Developed in accordance with ISO 26262:2011 requirements for hardware product development for use in safety-critical applications (pending assessment)
  • High diagnostic coverage
    • On-chip diagnostics include logic built-in self-test (LBIST), signal path diagnostics, and watchdogs to support safety-critical applications
    • 4-bit CRC on SPI
  • On-chip EEPROM for storing factory and customer calibration parameters
    • Single-bit error correction, dual-bit error detection through the use of error correction control (ECC)
  • Supports harsh operating conditions required for automotive and industrial applications, including direct connection to 12 V battery
    • Operating temperature range from –40°C to 150°C
    • Operating supply voltage range from 4.0 to 16.5 V
      • Can support ISO 7637-2 Pulse 5b up to 39 V
  • Multiple output formats supported for ease of system integration
    • ABI/UVW output provides high resolution, low latency, and PWM for initial position
    • 10 MHz SPI for low latency angle and diagnostic information; enables multiple independent ICs to be connected to the same bus
    • Output resolution on ABI and UVW are selectable
  • Multiple programming / configuration formats supported
    • The system can be completely controlled and programmed over SPI, including EEPROM writes
    • For system with limited pins available, writing and reading can be performed over VCC and PWM pins. This allows configuring the EEPROM in production line for a device with only ABI/UVW and PWM pins connected.
  • Stacked dual die construction to improve die-to-die matching for systems that require redundant sensors
  • Reduces magnet misalignment impact on die-to-die matching for a given magnet diameter, relative to “side-by-side” dual die orientation

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
A1333LLETR-5-T 14-lead TSSOP -40°C to 150°C Yes View Data Contact your
local sales rep
Distributor Stock
A1333LLETR-T 14-lead TSSOP -40°C to 150°C Yes View Data Contact your
local sales rep
Distributor Stock
A1333LLPTR-5-DD-T 24-lead TSSOP -40°C to 150°C Yes View Data Contact your
local sales rep
Distributor Stock
A1333LLPTR-DD-T 24-lead TSSOP -40°C to 150°C Yes View Data Contact your
local sales rep
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.