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Home > Products > Sensors, Transducers > Position Sensors > Angle, Linear Position Measuring

Allegro MicroSystems A1333LLPTR-DD-T

Name: A1333LLPTR-DD-T
Brand: Allegro MicroSystems
SKU: A1333LLPTR-DD-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A1333LLPTR-DD-T

Manufacturer:: Allegro MicroSystems

Category:: Angle, Linear Position Measuring

Package:: 24-TSSOP (0.173", 4.40mm Width) Exposed Pad

Datasheet:: A1333LLPTR-DD-T.pdf

Description:: SENSOR ANGLE 360DEG SMD

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Product details

Overview

A1333LLPTR-DD-T from Allegro MicroSystems is a dual-die, ASIL-D-capable 360° Hall-effect angle sensor IC for safety-critical automotive systems. It delivers 12-/15-bit angular position data via SPI (up to 10 MHz), ABI/UVW outputs, and PWM (98 Hz–3.125 kHz), with ±0.4° typical angle error at 25°C and operation from –40°C to 150°C. It is used in electronic power steering (EPS) and throttle actuation where redundant sensing and diagnostic coverage are mandatory.

For engineers reviewing the A1333LLPTR-DD-T datasheet, A1333LLPTR-DD-T pinout, A1333LLPTR-DD-T application, or A1333LLPTR-DD-T equivalent, this page provides verified package mapping (24-pin eTSSOP), dual-SoC architecture details, ASIL-D integration guidance, real-time diagnostics (LBIST, ZCD path, 4-bit CRC), and confirmed alternative part selection for functional redundancy or supply continuity.

Technical Context

The A1333LLPTR-DD-T implements two independent system-on-chip (SoC) die in a single 24-pin eTSSOP package, each with its own CVH front end, ADC, digital signal processing, and dedicated SPI interface (SCLK_1/MISO_1/MOSI_1/CS_1 and SCLK_2/MISO_2/MOSI_2/CS_2). Each die supports simultaneous 12-/15-bit angle readout, programmable ABI/UVW resolution (1–2048 PPR), and independent PWM output (98 Hz–3.125 kHz).

It features dual-signal-path architecture: a high-speed PLL-based main path for low-latency angle measurement (7 µs response time) and a secondary ZCD path for turns counting, field monitoring, and cross-die diagnostic comparison. On-chip EEPROM (100 write cycles) stores calibration, zero-point offset, and configuration-accessible via SPI or VCC/PWM pin programming.

Key Specifications

Parameter	Value and Actual Design Meaning
Angle Resolution	12-bit (SPI/PWM) and 15-bit (ABI/UVW) - enables sub-degree precision for closed-loop motor control and high-fidelity position feedback.
Angle Error	±0.4° typ. at 25°C, 300 G - ensures accurate rotor positioning in EPS without external compensation under nominal conditions.
Operating Temp	–40°C to +150°C - qualified for under-hood automotive environments including transmission and steering column mounting.
SPI Speed	Up to 10 MHz - supports low-latency, multi-device daisy-chaining on shared bus with deterministic timing.
PWM Range	98 Hz to 3.125 kHz - configurable carrier frequency allows optimization for EMI filtering and microcontroller capture resolution.
Supply Voltage	4.0 V to 16.5 V - direct connection to 12 V battery with ISO 7637-2 Pulse 5b tolerance up to 39 V.
Diagnostic Coverage	ASIL-D compliant via dual-die redundancy, LBIST, ZCD path comparison, and 4-bit SPI CRC - meets ISO 26262 SEooC requirements when integrated per safety manual.

Pinout & Package

Package: 24-pin eTSSOP (exposed thermal pad), lead-free, 100% matte tin plating. Dual-die construction with electrically isolated power/ground domains (VCC_1/GND_1 and VCC_2/GND_2) and fully independent signal paths.

Pin/Terminal	Circuit Role	Design Meaning
CS_1/SA0_1, CS_2/SA0_2	SPI chip-select / Manchester ID LSB	Active-low enable for each die's SPI interface; double-function pin supports Manchester ID encoding when tied to BYP or GND.
SCLK_1, SCLK_2	SPI clock input (die 1 & 2)	Asynchronous clock for serial communication; supports up to 10 MHz for low-latency register access.
MOSI_1/SA1_1, MOSI_2/SA1_2	SPI data-in / Manchester ID MSB	Serial command/data input per die; also encodes device ID in Manchester mode via tie-off configuration.
MISO_1, MISO_2	SPI data-out (die 1 & 2)	Independent readback channels allow concurrent angle/diagnostic reads from both SoCs without arbitration.
A_1/U_1, A_2/U_2	Quadrature A / UVW phase U output	Configurable per die: ABI encoder output (A/B/I) or BLDC commutation signal (U/V/W); supports 1–2048 PPR.
PWM_1, PWM_2	Angle-encoded PWM output (die 1 & 2)	Dedicated 12-bit PWM per die; duty cycle maps linearly to angle (5–95%), enabling simple MCU capture without SPI overhead.
TEST_1, TEST_2	Test pin (die 1 & 2)	Must be tied to GND for normal operation; used during production test and LBIST activation.
BYP_1, BYP_2	Internal regulator bypass (die 1 & 2)	Requires 0.1 µF ceramic capacitor per die to stabilize internal 3.3 V LDO; not intended to drive external loads.

Key Features

Feature	Design Value
Dual independent SoCs	Stacked die architecture improves die-to-die matching vs side-by-side layout - reduces impact of magnet misalignment on redundancy validation.
Programmable ABI/UVW resolution	4-bit EEPROM field sets pulses-per-revolution (1–2048 PPR) and pole pairs (1–16), enabling one hardware design to serve multiple motor types.
ZCD diagnostic path	Secondary signal path updates every 32 µs for real-time cross-check against main PLL path - detects drift, saturation, or magnetic fault conditions.
VCC/PWM pin programming	EEPROM configuration possible using only VCC and PWM pins - eliminates need for full SPI interface during end-of-line calibration on constrained PCBs.
On-chip ECC	Single-bit error correction and dual-bit detection on EEPROM - ensures integrity of factory and customer calibration data over 100+ write cycles.

Applications

Electronic Power Steering (EPS)	Throttle Actuator Position Sensing
Use Scenario: Real-time rotor angle feedback for brushless DC motor torque control in column-assist or rack-assist EPS modules. IC Role / Device Role / Timing Role: Primary angle sensor providing 15-bit UVW commutation signals and 12-bit SPI angle data with ≤7 µs latency to MCU. Use Value: Enables precise field-oriented control (FOC) and meets ASIL-D redundancy requirements via dual-die independent outputs and ZCD cross-validation.	Use Scenario: Monitoring butterfly valve angular position in gasoline direct injection (GDI) throttle bodies exposed to high under-hood temperatures. IC Role / Device Role / Timing Role: Contactless 360° position sensor delivering PWM output for fast closed-loop feedback and SPI for diagnostic logging. Use Value: Operates reliably at 150°C ambient with ±0.6° max angle error, eliminating potentiometer wear and enabling fail-safe limp-home modes.
Rotary PRNDL Selector	Electric Brake Booster Position Feedback
Use Scenario: Gear selector knob angle measurement in automatic transmission control units requiring tamper-proof, non-contact sensing. IC Role / Device Role / Timing Role: ABI quadrature output (programmable 1024 PPR) with index pulse (I/W) for absolute position initialization on power-up. Use Value: Eliminates mechanical switch bounce and contact corrosion; EEPROM-stored zero-point allows precise alignment to detent positions post-assembly.	Use Scenario: Monitoring master cylinder pushrod displacement in electro-hydraulic brake (EHB) systems for pedal feel emulation and regenerative braking coordination. IC Role / Device Role / Timing Role: Dual-die A1333LLPTR-DD-T provides redundant 12-bit angle data streams via separate SPI buses to two safety MCUs. Use Value: Meets ASIL-D decomposition requirements through physically independent signal chains, with built-in LBIST and CRC ensuring data integrity.

Electronic Power Steering (EPS)

Throttle Actuator Position Sensing

Use Scenario: Real-time rotor angle feedback for brushless DC motor torque control in column-assist or rack-assist EPS modules.

IC Role / Device Role / Timing Role: Primary angle sensor providing 15-bit UVW commutation signals and 12-bit SPI angle data with ≤7 µs latency to MCU.

Use Value: Enables precise field-oriented control (FOC) and meets ASIL-D redundancy requirements via dual-die independent outputs and ZCD cross-validation.

Use Scenario: Monitoring butterfly valve angular position in gasoline direct injection (GDI) throttle bodies exposed to high under-hood temperatures.

IC Role / Device Role / Timing Role: Contactless 360° position sensor delivering PWM output for fast closed-loop feedback and SPI for diagnostic logging.

Use Value: Operates reliably at 150°C ambient with ±0.6° max angle error, eliminating potentiometer wear and enabling fail-safe limp-home modes.

Rotary PRNDL Selector

Electric Brake Booster Position Feedback

Use Scenario: Gear selector knob angle measurement in automatic transmission control units requiring tamper-proof, non-contact sensing.

IC Role / Device Role / Timing Role: ABI quadrature output (programmable 1024 PPR) with index pulse (I/W) for absolute position initialization on power-up.

Use Value: Eliminates mechanical switch bounce and contact corrosion; EEPROM-stored zero-point allows precise alignment to detent positions post-assembly.

Use Scenario: Monitoring master cylinder pushrod displacement in electro-hydraulic brake (EHB) systems for pedal feel emulation and regenerative braking coordination.

IC Role / Device Role / Timing Role: Dual-die A1333LLPTR-DD-T provides redundant 12-bit angle data streams via separate SPI buses to two safety MCUs.

Use Value: Meets ASIL-D decomposition requirements through physically independent signal chains, with built-in LBIST and CRC ensuring data integrity.

Equivalent & Alternatives

The following parts are listed as comparable options for similar angle sensing applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
A1333LLETR-T	Single-die 14-pin TSSOP; supports ASIL-B only; no dual-SPI or redundant PWM outputs.	Used in cost-sensitive, non-redundant applications like HVAC damper control or seat position sensing.	Select when ASIL-D is not required and PCB space or BOM count must be minimized; not suitable for EPS or brake systems.
AMS AS5055A	Single-die 16-pin TSSOP; 14-bit resolution; SPI-only interface; no PWM or ABI/UVW outputs; ASIL-B certified.	Targeted at industrial rotary encoders and medical equipment where analog voltage output or I²C is preferred.	Choose for lower-resolution, non-automotive applications needing compact size and simpler interface; lacks dual-die redundancy and automotive qualification.

Compared with A1333LLETR-T and AMS AS5055A, the A1333LLPTR-DD-T uniquely delivers ASIL-D compliance via stacked dual-die architecture, independent PWM/ABI/UVW outputs per die, and ZCD-based cross-die diagnostics - making it the only option qualified for primary angle sensing in EPS and brake-by-wire systems.

Availability

A1333LLPTR-DD-T is available at Aetrix Electronics and suitable for electronic power steering (EPS), throttle actuation, rotary PRNDL, and electric brake booster applications requiring stable component supply, long-term automotive lifecycle support, and ASIL-D-compliant sourcing.

Supply support for A1333LLPTR-DD-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Allegro MicroSystems designs high-performance magnetic sensing and power ICs for automotive and industrial motion control. Founded in 1985, it specializes in Hall-effect, current-sensing, and motor driver solutions with deep expertise in functional safety.

The A1333 product line was developed specifically for ASIL-D automotive angle sensing, integrating dual-die redundancy, on-chip diagnostics, and EEPROM-programmable interfaces to replace legacy resolver and potentiometer-based systems in EPS and transmission controls.

FAQ

What safety standard compliance does the A1333LLPTR-DD-T support?

The A1333LLPTR-DD-T is developed as an ASIL-D safety element out of context (SEooC) per ISO 26262, with dual-die architecture, LBIST, ZCD path comparison, and 4-bit SPI CRC. Its ASIL-D compliance requires integration per the A1333 Safety Manual - including system-level watchdogs, independent power domains, and fault-handling logic in the host MCU. The A1333LLPTR-DD-T itself is not "certified" but qualifies as a compliant SEooC building block.

How is redundancy implemented in the A1333LLPTR-DD-T?

Redundancy in the A1333LLPTR-DD-T is achieved via two physically independent SoC die in one 24-pin eTSSOP package, each with separate VCC/GND pins, SPI interfaces, PWM outputs, and ABI/UVW drivers. Die-to-die matching is enhanced by stacked orientation - reducing sensitivity to magnet misalignment compared to side-by-side layouts. Cross-die validation uses the ZCD path for real-time consistency checks.

Can the A1333LLPTR-DD-T operate directly from a 12 V battery?

Yes, the A1333LLPTR-DD-T operates from 4.0 V to 16.5 V and withstands ISO 7637-2 Pulse 5b transients up to 39 V. Its internal regulator accepts raw battery input, and BYP_1/BYP_2 pins require 0.1 µF ceramic capacitors for stabilization. No external pre-regulator is needed for 12 V automotive battery connection - simplifying power design in EPS and throttle modules.

What output formats does the A1333LLPTR-DD-T support?

The A1333LLPTR-DD-T supports four concurrent output formats per die: 10 MHz SPI (12-/15-bit angle + diagnostics), programmable PWM (98 Hz–3.125 kHz, 12-bit), ABI quadrature (1–2048 PPR), and UVW BLDC commutation (1–16 pole pairs). All outputs are independently configurable via EEPROM, allowing mixed-mode use - e.g., SPI for diagnostics and PWM for real-time control.

Is EEPROM programming possible without a full SPI interface?

Yes, the A1333LLPTR-DD-T supports EEPROM programming over VCC and PWM pins - a feature called "pin-programming mode." By applying specific voltage sequences to VCC while toggling PWM, users can write calibration data and configuration bits without connecting MOSI/MISO/SCLK/CS. This enables in-system calibration on PCBs with minimal pin count, such as throttle bodies with only PWM and power connections.

A1333LLPTR-DD-T Specifications

Product attributes: Attribute value

Manufacturer:: Allegro MicroSystems

Package/Case:: 24-TSSOP (0.173", 4.40mm Width) Exposed Pad

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: -

For Measuring:: Angle

Technology:: Hall Effect

Rotation Angle - Electrical, Mechanical:: 0° ~ 360°, Continuous

Linear Range:: -

Output:: PWM, SPI

Output Signal:: Programmable

Actuator Type:: External Magnet, Not Included

Linearity:: -

Resistance:: -

Resistance Tolerance:: -

Voltage - Supply:: 4V ~ 16.5V

Mounting Type:: Surface Mount

Termination Style:: Gull Wing

Operating Temperature:: -40°C ~ 150°C (TA)

Grade:: -

Qualification:: -

Supplier Device Package:: 24-TSSOP-EP

A1333LLPTR-DD-T FAQ

1.How can I place an order for A1333LLPTR-DD-T through Aetrix?

Please submit a Request for Quotation (RFQ) for A1333LLPTR-DD-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for A1333LLPTR-DD-T reliable?

The price and inventory of A1333LLPTR-DD-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1333LLPTR-DD-T is usually 5 days.

3.What payment methods are accepted for A1333LLPTR-DD-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1333LLPTR-DD-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A1333LLPTR-DD-T?

A1333LLPTR-DD-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A1333LLPTR-DD-T order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for A1333LLPTR-DD-T?

For technical support, including A1333LLPTR-DD-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1333LLPTR-DD-T requirements.

6.How does Aetrix verify that A1333LLPTR-DD-T is sourced from the original manufacturer or authorized distributors?

All A1333LLPTR-DD-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that A1333LLPTR-DD-T meets industry standards.

7.What is the process for return or replacement of A1333LLPTR-DD-T?

All A1333LLPTR-DD-T units undergo pre-shipment inspection (PSI). If there is an issue with A1333LLPTR-DD-T, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The A1333LLPTR-DD-T part is unused and in its original packaging.

Return procedure for A1333LLPTR-DD-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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