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

Allegro MicroSystems AAS33051LLPBTR-5-DD

Name: AAS33051LLPBTR-5-DD
Brand: Allegro MicroSystems
SKU: AAS33051LLPBTR-5-DD
Price: 2.40 USD
Availability: InStock
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Part No.:: AAS33051LLPBTR-5-DD

Manufacturer:: Allegro MicroSystems

Category:: Angle, Linear Position Measuring

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

Datasheet:: AAS33051LLPBTR-5-DD.pdf

Description:: ASIL ANGLE SENSOR W/ LIN. & TURN

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Product details

Overview

AAS33051LLPBTR-5-DD from Allegro MicroSystems is a dual-die 360° contactless angle sensor IC based on Circular Vertical Hall (CVH) technology, delivering 12/15-bit angular position resolution, <1.38° hysteresis, and ASIL D safety compliance for automotive EPS and BLDC motor commutation. It supports SPI (up to 10 MHz), PWM, and selectable UVW/ABI outputs with on-chip 32-segment linearization and EEPROM-programmable calibration.

For engineers reviewing the AAS33051LLPBTR-5-DD datasheet, AAS33051LLPBTR-5-DD pinout, AAS33051LLPBTR-5-DD application, or AAS33051LLPBTR-5-DD equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions for eTSSOP-24, safety-critical integration guidance, and two confirmed alternative parts with documented functional and application differences.

Technical Context

The AAS33051LLPBTR-5-DD integrates two electrically independent CVH sensor dies in a single 24-pin eTSSOP package, each with dedicated SPI (MISO_1/SCLK_1/MOSI_1/CS_1 and MISO_2/SCLK_2/MOSI_2/CS_2), PWM, ABI/UVW, and wake-up interfaces. Its SoC architecture performs real-time angle computation with 1 µs refresh rate and 10 µs response latency.

It implements ISO 26262-compliant diagnostics including LBIST, signal-path monitoring, 4-bit SPI CRC, and watchdog timers-enabling ASIL D system-level compliance when integrated per the Safety Manual. On-chip 32-segment linearization compensates for magnet misalignment and imperfect magnetization, reducing angle error to ±0.4° at 25°C and ±0.7° at 150°C under 300 G field.

Key Specifications

Parameter	Value and Actual Design Meaning
Angle Resolution	12-bit or 15-bit via SPI; enables high-precision closed-loop control in EPS and transmission actuators
Effective Resolution	12.47 bits at 300 G; ensures sub-degree repeatability for BLDC rotor positioning
Angular Hysteresis	≤1.38° programmable; minimizes direction-dependent error in bidirectional steering applications
Supply Voltage Range	3.7–18 V; supports direct 12 V battery connection with ISO 7637-2 Pulse 5b tolerance up to 39 V
Operating Temperature	–40°C to +150°C; qualified for under-hood automotive environments without derating
SPI Clock Frequency	Up to 10 MHz; allows low-latency angle reads (<1.6 µs transaction time) for real-time motor control
Low-Power Mode Current	76 µA typical at 25°C; sustains turns counting during vehicle off-state with minimal battery drain

Pinout & Package

Package: 24-pin eTSSOP (exposed thermal pad), 1 mm profile, Pb-free with 100% matte-tin plating-optimized for minimal air gap to target magnet and enhanced thermal dissipation (R_θJA = 69°C/W).

Pin/Terminal	Circuit Role	Design Meaning
VCC_1 / VCC_2	Power supply inputs (die 1 and die 2)	Independent 3.7–18 V supplies enable redundancy isolation; supports 5 V interface logic
GND_1 / GND_2 / GND	Ground terminals (die-specific and common)	Dedicated ground paths reduce crosstalk between dual dies; exposed pad enhances thermal stability
SCLK_1 / SCLK_2 MOSI_1 / MOSI_2 MISO_1 / MISO_2 CS_1 / CS_2	Dual independent SPI interfaces	Enables concurrent readout of both dies for fault-tolerant angle sensing; 4-bit CRC per channel
PWM_1 / PWM_2	Angle-proportional PWM outputs	Clamped 5–95% duty cycle provides diagnostic visibility; configurable frequency (98 Hz–3.125 kHz)
A_1/U_1 / A_2/U_2 B_1/V_1 / B_2/V_2 I_1/W_1 / I_2/W_2	Selectable incremental (A/B/I) or motor commutation (U/V/W) outputs	Hardware-selectable mode eliminates external logic; ABI supports quadrature decoding; UVW drives 3-phase BLDC
WAKE_1 / WAKE_2	External wake-up inputs	Allows low-power mode exit on magnetic event detection-critical for start-stop EPS systems

Key Features

Feature	Design Value
On-chip 32-segment linearization	Compensates magnet-to-sensor misalignment and non-uniform magnetization without external MCU processing
Dual-die ASIL D architecture	Two independent CVH dies with separate power, ground, and SPI-meets ISO 26262 hardware requirements for redundant sensing
EEPROM with ECC	100-cycle endurance with single-bit correction/dual-bit detection ensures reliable storage of factory and customer calibration data
Turns counter with low-power mode	Tracks absolute motor rotation across ignition cycles; retains position during vehicle off-state using <76 µA quiescent current
Multi-format output flexibility	Single device supports SPI (diagnostic-rich), PWM (fast startup), and ABI/UVW (low-latency control)-reducing BOM count

Applications

Electronic Power Steering (EPS)	Electric Parking Brake (EPB)
Use Scenario: Real-time measurement of steering column angle and torque for assist motor control and lane-keeping feedback. IC Role / Device Role / Timing Role: Primary angle sensor providing 10 µs latency ABI output and 1 µs refresh rate for closed-loop PID control. Use Value: Dual-die redundancy and ASIL D compliance eliminate single-point failure risk; 32-segment linearization maintains ±0.7° accuracy despite magnet tilt in compact column assemblies.	Use Scenario: Monitoring caliper actuator position during parking brake engagement and release in automated braking systems. IC Role / Device Role / Timing Role: Safety-critical position feedback device with EEPROM-stored zero-offset and turn-counting for absolute position recovery after power loss. Use Value: Low-power mode (<76 µA) preserves battery life during long-term parking; PWM output provides immediate angle on wake-up before SPI initialization.
Transmission Actuators	BLDC Pumps (e.g., HVAC, coolant)
Use Scenario: Gear selector position sensing and shift-by-wire actuator feedback in automatic transmissions. IC Role / Device Role / Timing Role: Dual-die angle sensor delivering independent SPI streams for cross-checking and fault detection per ASIL D requirements. Use Value: 150°C operation survives under-transmission heat; on-chip linearization corrects for thermal expansion-induced magnet misalignment.	Use Scenario: Rotor position feedback for field-oriented control (FOC) of brushless DC pumps in engine cooling and cabin HVAC systems. IC Role / Device Role / Timing Role: UVW commutation output driving gate drivers with <10 µs latency; supports up to 15,000 RPM motor speeds. Use Value: 12.47-bit effective resolution enables smooth torque delivery; 3.7–18 V supply tolerates battery transients during cold cranking.

Electronic Power Steering (EPS)

Electric Parking Brake (EPB)

Use Scenario: Real-time measurement of steering column angle and torque for assist motor control and lane-keeping feedback.

IC Role / Device Role / Timing Role: Primary angle sensor providing 10 µs latency ABI output and 1 µs refresh rate for closed-loop PID control.

Use Value: Dual-die redundancy and ASIL D compliance eliminate single-point failure risk; 32-segment linearization maintains ±0.7° accuracy despite magnet tilt in compact column assemblies.

Use Scenario: Monitoring caliper actuator position during parking brake engagement and release in automated braking systems.

IC Role / Device Role / Timing Role: Safety-critical position feedback device with EEPROM-stored zero-offset and turn-counting for absolute position recovery after power loss.

Use Value: Low-power mode (<76 µA) preserves battery life during long-term parking; PWM output provides immediate angle on wake-up before SPI initialization.

Transmission Actuators

BLDC Pumps (e.g., HVAC, coolant)

Use Scenario: Gear selector position sensing and shift-by-wire actuator feedback in automatic transmissions.

IC Role / Device Role / Timing Role: Dual-die angle sensor delivering independent SPI streams for cross-checking and fault detection per ASIL D requirements.

Use Value: 150°C operation survives under-transmission heat; on-chip linearization corrects for thermal expansion-induced magnet misalignment.

Use Scenario: Rotor position feedback for field-oriented control (FOC) of brushless DC pumps in engine cooling and cabin HVAC systems.

IC Role / Device Role / Timing Role: UVW commutation output driving gate drivers with <10 µs latency; supports up to 15,000 RPM motor speeds.

Use Value: 12.47-bit effective resolution enables smooth torque delivery; 3.7–18 V supply tolerates battery transients during cold cranking.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AAS33051LLPBTR-DD	3.3 V interface logic; identical dual-die eTSSOP-24 package and pinout	Requires 3.3 V level-shifted SPI/ABI; lower noise margin in noisy 12 V automotive environments	Choose for existing 3.3 V system designs where voltage translation is already implemented
A1339LLETR-2	Single-die, 14-pin TSSOP, 3.3 V interface; no dual-die redundancy or ASIL D support	Limited to ASIL B applications; lacks turns counter and transport mode; lower temperature rating (125°C)	Choose for cost-sensitive, non-redundant applications like throttle position where ASIL D is not mandated

Compared with AAS33051LLPBTR-DD and A1339LLETR-2, the AAS33051LLPBTR-5-DD uniquely delivers 5 V interface compatibility for robust noise immunity, dual-die ASIL D compliance for safety-critical redundancy, and full feature parity-including turns counting and transport mode-without requiring PCB redesign.

Availability

AAS33051LLPBTR-5-DD is available at Aetrix Electronics and suitable for electronic power steering (EPS), electric parking brake (EPB), transmission actuators, and BLDC pump applications requiring stable component supply, automotive-grade lifecycle assurance, and ASIL D-ready sourcing.

Supply support for AAS33051LLPBTR-5-DD 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 is a U.S.-based designer and manufacturer of high-performance Hall-effect sensors and power ICs, specializing in motion control and energy-efficient solutions for automotive and industrial markets.

The AAS33051 product line delivers precision magnetic angle sensing for safety-critical automotive subsystems, with architecture optimized for ISO 26262 compliance, harsh-environment operation, and seamless integration into EPS, EPB, and BLDC motor control systems.

FAQ

What is the interface voltage specification for the AAS33051LLPBTR-5-DD?

The AAS33051LLPBTR-5-DD is rated for 5.0 V interface logic, supporting VIH ≥ 3.75 V and VOH ≥ 4.0 V on all digital pins (SPI, ABI/UVW, PWM). This provides higher noise immunity than the 3.3 V variant (AAS33051LLPBTR-DD) in electrically noisy automotive environments while maintaining full pin compatibility and identical functionality. The AAS33051LLPBTR-5-DD operates from 3.7–18 V supply but uses 5 V logic levels internally and externally.

How does the dual-die architecture of the AAS33051LLPBTR-5-DD support ASIL D compliance?

The AAS33051LLPBTR-5-DD integrates two physically and electrically isolated CVH sensor dies in one eTSSOP-24 package, each with independent power (VCC_1/VCC_2), ground (GND_1/GND_2), SPI (SCLK_1/MOSI_1/MISO_1/CS_1 and SCLK_2/MOSI_2/MISO_2/CS_2), and output channels. This separation enables cross-die comparison for fault detection and meets ISO 26262 hardware requirements for ASIL D when used per the AAS33051 Safety Manual. The AAS33051LLPBTR-5-DD achieves this without external redundancy circuitry.

What is the purpose and behavior of the PWM output on the AAS33051LLPBTR-5-DD?

The AAS33051LLPBTR-5-DD PWM output provides a 12-bit angle-proportional duty cycle (5–95%) with fixed rising edges and variable falling edges across 0–360°, enabling fast wake-up and initial position acquisition before SPI initialization. It supports 128 programmable frequency steps (98 Hz–3.125 kHz) and enters diagnostic modes-such as fixed-duty-cycle error reporting (e.g., 5% for watchdog error) or high-Z state-when faults occur. The AAS33051LLPBTR-5-DD PWM is fully configurable via SPI registers and retains settings in EEPROM.

Can the AAS33051LLPBTR-5-DD be used in systems requiring absolute position tracking after power loss?

Yes-the AAS33051LLPBTR-5-DD includes a nonvolatile turns counter that persists position data across power cycles using its low-power mode (<76 µA at 25°C). When vehicle power is removed, the AAS33051LLPBTR-5-DD enters sleep mode and continues monitoring magnetic rotation via wake-up triggers. Upon restart, it reports accumulated turns plus current angle, enabling true absolute position recovery without homing routines. External storage of turns values is also supported via SPI write-back.

What magnetic field strength and temperature range is the AAS33051LLPBTR-5-DD specified for?

The AAS33051LLPBTR-5-DD is specified for magnetic fields up to 1200 G and operates across –40°C to +150°C ambient temperature. At 300 G field strength, it achieves ±0.4° angle error at 25°C and ±0.7° at 150°C, with 1.4° maximum drift over lifetime per AEC-Q100 qualification. Its CVH technology provides air-gap independence, and the 1 mm thin eTSSOP package minimizes distance to the magnet-enhancing field coupling and signal-to-noise ratio in constrained mechanical layouts.

AAS33051LLPBTR-5-DD 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°

Linear Range:: -

Output:: PWM

Output Signal:: Clockwise Increase

Actuator Type:: External Magnet, Not Included

Linearity:: -

Resistance:: -

Resistance Tolerance:: -

Voltage - Supply:: 3.7V ~ 18V

Mounting Type:: Surface Mount

Termination Style:: SMD (SMT) Tab

Operating Temperature:: -40°C ~ 150°C

Grade:: -

Qualification:: -

Supplier Device Package:: 24-TSSOP-EP

AAS33051LLPBTR-5-DD FAQ

1.How can I place an order for AAS33051LLPBTR-5-DD through Aetrix?

Please submit a Request for Quotation (RFQ) for AAS33051LLPBTR-5-DD 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 AAS33051LLPBTR-5-DD reliable?

The price and inventory of AAS33051LLPBTR-5-DD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AAS33051LLPBTR-5-DD is usually 5 days.

3.What payment methods are accepted for AAS33051LLPBTR-5-DD?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AAS33051LLPBTR-5-DD transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AAS33051LLPBTR-5-DD?

AAS33051LLPBTR-5-DD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AAS33051LLPBTR-5-DD 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 AAS33051LLPBTR-5-DD?

For technical support, including AAS33051LLPBTR-5-DD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AAS33051LLPBTR-5-DD requirements.

6.How does Aetrix verify that AAS33051LLPBTR-5-DD is sourced from the original manufacturer or authorized distributors?

All AAS33051LLPBTR-5-DD 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 AAS33051LLPBTR-5-DD meets industry standards.

7.What is the process for return or replacement of AAS33051LLPBTR-5-DD?

All AAS33051LLPBTR-5-DD units undergo pre-shipment inspection (PSI). If there is an issue with AAS33051LLPBTR-5-DD, 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 AAS33051LLPBTR-5-DD part is unused and in its original packaging.

Return procedure for AAS33051LLPBTR-5-DD:

1.Submit a request within 90 days.

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

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