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Allegro MicroSystems AAS33051LLPBTR-DD
- Part No.:
- AAS33051LLPBTR-DD
- Manufacturer:
- Allegro MicroSystems
- Category:
- Angle, Linear Position Measuring
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
AAS33051LLPBTR-DD.pdf
- Description:
- 1339 IN SG6.5 WITH LINEARIZATION
- Quantity:
- Payment:
- Shipping:
Inventory:4,033
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Product details
Overview
AAS33051LLPBTR-DD from Allegro MicroSystems is a dual-die 360° contactless angle sensor IC based on circular vertical Hall (CVH) technology, delivering 12- or 15-bit angular position data with ≤1.38° hysteresis and ±0.4° typical angle error at 25°C. It supports SPI (up to 10 MHz), PWM, and dual-channel ABI/UVW outputs, and integrates on-chip 32-segment linearization and EEPROM for calibration storage - deployed in automotive electronic power steering (EPS) and BLDC motor commutation systems.
For engineers reviewing the AAS33051LLPBTR-DD datasheet, AAS33051LLPBTR-DD pinout, AAS33051LLPBTR-DD application, or AAS33051LLPBTR-DD equivalent, key selection considerations include ASIL B fail-operational capability (dual-die), 3.3 V interface compatibility, 24-pin eTSSOP package with thermal pad, low-power mode (76 µA typ. at 25°C), and magnetic field tolerance up to 1200 G.
Technical Context
The AAS33051LLPBTR-DD implements a dual-die SoC architecture with independent CVH front ends, digital signal processing, and parallel output paths: SPI (10 MHz, CRC-protected), PWM (98 Hz–3.125 kHz, clamped 5–95%), and programmable ABI/UVW interfaces. Each die includes dedicated regulators, self-test logic (LBIST/CVHST), watchdogs, and ECC-protected EEPROM.
It supports ASIL B safety element out-of-context (SEooC) per ISO 26262 when integrated per the Safety Manual, with dual-die construction enabling redundant sensing channels. The 1 mm thin eTSSOP package minimizes air gap to target magnet, enhancing field coupling and enabling operation under harsh automotive conditions (−40°C to 150°C, 3.7–18 V supply).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Angle Resolution | 12-bit or 15-bit via SPI; 12-bit fixed for PWM; programmable for ABI/UVW - enables high-fidelity rotor position tracking in EPS and BLDC control loops. |
| Angle Error | ±0.4° (typ. at 25°C, 300 G, ideal alignment) - ensures precise closed-loop torque control without external calibration. |
| Output Latency | 10 µs response time (ABI/UVW); 1 µs refresh rate - meets real-time motor commutation timing requirements for >15,000 rpm operation. |
| Supply Range | 3.7 V to 18 V (abs. max 28 V) - supports direct 12 V battery connection with ISO 7637-2 Pulse 5b immunity up to 39 V. |
| Operating Temp | −40°C to 150°C junction - qualified for under-hood automotive environments including EPS actuators and transmission valves. |
| Low-Power Current | 76 µA (typ. at 25°C, 5 V, 96 ms sleep) - enables persistent turns counting during vehicle ignition-off state. |
| Safety Certification | ASIL B SEooC (ISO 26262), dual-die version designed for ASIL D - provides diagnostic coverage for fail-operational system integration. |
| Magnetic Field Range | Up to 1200 G - accommodates wide air-gap variations and high-strength magnets in compact mechanical layouts. |
Pinout & Package
Package: 24-pin eTSSOP (LP suffix), 1 mm profile, lead-free with 100% matte tin plating, exposed thermal pad (PAD) for enhanced thermal dissipation (RθJA = 69°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS_1, CS_2 | SPI chip-select (active-low) | Independent enable signals for dual-die SPI buses - allows daisy-chaining or isolated communication with each sensor channel. |
| SCLK_1, SCLK_2 | SPI clock input | Supports up to 10 MHz clocking per die - enables low-latency angle reads (<1.6 µs transaction time at 10 MHz). |
| MOSI_1, MOSI_2 | SPI data-in / Manchester address | Dual-function pins: SPI command input or Manchester interface address selection - reduces pin count in space-constrained designs. |
| MISO_1, MISO_2 | SPI data-out with CRC | CRC-protected serial output per die - ensures data integrity in noisy automotive ECU environments. |
| A_1/U_1, A_2/U_2 B_1/V_1, B_2/V_2 I_1/W_1, I_2/W_2 |
Quadrature or motor commutation outputs | Configurable ABI (encoder) or UVW (BLDC phase) signals - supports both position feedback and six-step commutation without external logic. |
| PWM_1, PWM_2 | Pulse-width modulated angle output | 12-bit proportional duty cycle (5–95% clamped) - provides fast initial position acquisition for ABI/UVW startup synchronization. |
| VCC_1, VCC_2 GND_1, GND_2 BYP_1, BYP_2 |
Independent power domains | Dual-regulator architecture isolates noise between dies - critical for functional safety redundancy and EMC robustness. |
| WAKE_1, WAKE_2 | External wake-up input | Enables low-power mode exit via external event (e.g., CAN wakeup) - supports energy-efficient always-on sensing in ADAS subsystems. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 32-segment linearization | Compensates misalignment and magnet imperfection errors in real time - eliminates need for external lookup tables or host MCU computation. |
| Dual-die ASIL-capable architecture | Independent CVH dies with separate power, SPI, and outputs - enables hardware-redundant sensing for ASIL D system compliance when used per Safety Manual. |
| EEPROM with ECC and CRC | 100-cycle endurance, single-bit correction/dual-bit detection - stores factory and customer calibration parameters with guaranteed data integrity over lifetime. |
| Multi-interface output flexibility | Simultaneous SPI (diagnostic + high-res), PWM (fast init), and ABI/UVW (low-latency commutation) - simplifies integration across ECU architectures and legacy platforms. |
| Low-power turns counter | Maintains absolute motor position during vehicle off-state using <76 µA average current - enables seamless restart without homing in EPS and EPB applications. |
| Robust automotive qualification | AEC-Q100 Grade 0 (−40°C to 150°C), ISO 7637-2 Pulse 5b support, reverse-battery protection - validated for direct battery connection in harsh under-hood locations. |
Applications
| Electronic Power Steering (EPS) | Electric Parking Brake (EPB) |
|---|---|
|
Use Scenario: Real-time measurement of steering column rotation angle for assist-torque calculation and active return control. IC Role / Device Role / Timing Role: Primary 360° angle sensor providing 10 µs latency ABI/UVW outputs synchronized to motor commutation timing. Use Value: Enables precise torque overlay and lane-centering functions with <±0.4° error, meeting ASIL B functional safety requirements for steer-by-wire readiness. |
Use Scenario: Monitoring caliper actuator position during parking brake engagement and release cycles. IC Role / Device Role / Timing Role: Dual-die redundant angle sensor supplying independent SPI and PWM streams for cross-checking in fail-operational EPB ECUs. Use Value: Supports ASIL D system-level compliance via hardware redundancy and on-chip diagnostics (LBIST, CVHST, watchdogs). |
| Transmission Actuators | Brushless DC (BLDC) Pumps |
|
Use Scenario: Gear selector position feedback in 8-speed automatic transmissions with hydraulic actuation. IC Role / Device Role / Timing Role: High-temperature (150°C) angle sensor delivering 12-bit SPI data and PWM initialization signal for gear-shift validation. Use Value: Maintains accuracy over full temperature range with <1.38° hysteresis - prevents false gear-position faults during hot-soak conditions. |
Use Scenario: Rotor position sensing for HVAC or coolant pump BLDC motors in electric vehicles. IC Role / Device Role / Timing Role: UVW commutation interface driving gate drivers with <10 µs latency, plus turns counter for absolute position after power loss. Use Value: Eliminates need for external resolvers or encoders - reduces BOM cost and PCB area while supporting 15,000+ rpm operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 360° magnetic angle sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AAS33051LLEATR | Single-die, 14-pin TSSOP, same 3.3 V interface and core functionality - lacks second die, thermal pad, and ASIL D capability. | Targeted at cost-sensitive, non-redundant applications (e.g., HVAC damper control) where ASIL B suffices and board space is constrained. | Select when dual-die redundancy, thermal performance, or ASIL D integration is not required - offers pin-compatible migration path from A1339 LE variants. |
| A1339LLETR-SP | Legacy single-die 14-pin TSSOP, no on-chip linearization, lower resolution (12-bit only), no EEPROM, no ASIL certification. | Suitable for basic angular position feedback in non-safety-critical industrial systems - lacks diagnostics, low-power turns counter, and field strength adaptability. | Choose only for legacy design continuity or prototyping; AAS33051LLPBTR-DD provides superior accuracy, safety features, and magnetic robustness for new automotive programs. |
Compared with AAS33051LLEATR and A1339LLETR-SP, the AAS33051LLPBTR-DD delivers dual-die redundancy, ASIL D-ready architecture, on-chip 32-segment linearization, and 100-cycle EEPROM - making it the only option qualified for next-generation EPS and EPB systems requiring fail-operational behavior and long-term calibration stability.
Availability
AAS33051LLPBTR-DD is available at Aetrix Electronics and suitable for electronic power steering (EPS), electric parking brake (EPB), and transmission actuator applications requiring stable component supply, automotive-grade lifecycle management, and ASIL-compliant sourcing.
Supply support for AAS33051LLPBTR-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 magnetic sensing solutions for automotive, industrial, and consumer markets.
The AAS33051 product line delivers precision 360° angle sensing for safety-critical automotive motion control - engineered to replace resolvers and optical encoders with contactless, robust, and ASIL-certifiable alternatives.
FAQ
What is the primary function of the AAS33051LLPBTR-DD in automotive systems?
The AAS33051LLPBTR-DD serves as a dual-die contactless 360° angle sensor IC that measures rotational position using circular vertical Hall (CVH) technology. It delivers high-resolution angular data via SPI, PWM, and ABI/UVW outputs for real-time motor control in applications like electronic power steering and electric parking brakes. Its on-chip linearization, EEPROM, and ASIL B/D compliance make it integral to functional safety architectures - the AAS33051LLPBTR-DD replaces traditional resolvers in modern EPS ECUs while reducing system cost and complexity.
How does the dual-die architecture of the AAS33051LLPBTR-DD support ASIL D compliance?
The AAS33051LLPBTR-DD integrates two electrically independent sensor dies in one 24-pin eTSSOP package, each with dedicated power supplies, regulators, SPI interfaces, and output channels. This physical separation enables hardware redundancy - allowing cross-checking of angle data and independent fault detection. When implemented per the AAS33051 Safety Manual, the dual-die configuration meets ASIL D requirements for fail-operational systems. The AAS33051LLPBTR-DD achieves this without external components, unlike single-die alternatives that require external duplication for equivalent safety integrity.
What output interfaces does the AAS33051LLPBTR-DD support, and how are they typically used together?
The AAS33051LLPBTR-DD supports three concurrent output formats: SPI (10 MHz, CRC-protected), PWM (programmable 98 Hz–3.125 kHz), and ABI/UVW (quadrature or BLDC commutation). In practice, PWM provides fast initial position acquisition at startup; ABI/UVW delivers ultra-low-latency (10 µs) angle data for real-time commutation; and SPI carries high-resolution (12-/15-bit) angle values plus diagnostics and configuration registers. This multi-interface strategy eliminates trade-offs between speed, resolution, and reliability - the AAS33051LLPBTR-DD enables seamless integration across diverse ECU architectures without compromising performance.
Can the AAS33051LLPBTR-DD operate reliably in high-temperature automotive environments?
Yes, the AAS33051LLPBTR-DD is qualified for continuous operation from −40°C to 150°C ambient temperature and has a maximum junction temperature of 170°C. It incorporates thermal protection, on-chip temperature monitoring, and robust packaging (1 mm thin eTSSOP with exposed thermal pad) to maintain accuracy under under-hood conditions. At 150°C, its angle error remains within ±0.7° and low-power mode current stays below 170 µA - ensuring reliable performance in EPS modules, transmission valve bodies, and engine-mounted BLDC pumps. The AAS33051LLPBTR-DD meets AEC-Q100 Grade 0 requirements for these demanding use cases.
What role does the on-chip EEPROM play in the AAS33051LLPBTR-DD's calibration and field serviceability?
The AAS33051LLPBTR-DD includes ECC-protected EEPROM capable of 100 read/write cycles, storing factory calibration coefficients, customer-defined linearization segments, zero-offset values, and safety configuration parameters. This enables one-time programming during manufacturing and field updates via SPI - eliminating need for external memory or host MCU calibration routines. The EEPROM supports error correction and CRC verification, ensuring data integrity over automotive lifetime. For example, magnet misalignment compensation can be tuned post-assembly and retained across power cycles - a capability central to the AAS33051LLPBTR-DD's deployment in production EPS systems.
AAS33051LLPBTR-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:
- Gull Wing
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 24-TSSOP-EP
AAS33051LLPBTR-DD FAQ
1.How can I place an order for AAS33051LLPBTR-DD through Aetrix?
Please submit a Request for Quotation (RFQ) for AAS33051LLPBTR-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-DD reliable?
The price and inventory of AAS33051LLPBTR-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-DD is usually 5 days.
3.What payment methods are accepted for AAS33051LLPBTR-DD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AAS33051LLPBTR-DD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AAS33051LLPBTR-DD?
AAS33051LLPBTR-DD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AAS33051LLPBTR-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-DD?
For technical support, including AAS33051LLPBTR-DD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AAS33051LLPBTR-DD requirements.
6.How does Aetrix verify that AAS33051LLPBTR-DD is sourced from the original manufacturer or authorized distributors?
All AAS33051LLPBTR-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-DD meets industry standards.
7.What is the process for return or replacement of AAS33051LLPBTR-DD?
All AAS33051LLPBTR-DD units undergo pre-shipment inspection (PSI). If there is an issue with AAS33051LLPBTR-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-DD part is unused and in its original packaging.
Return procedure for AAS33051LLPBTR-DD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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