My Inquiry
My Account
Allegro MicroSystems AAS33051LLEATR
- Part No.:
- AAS33051LLEATR
- Manufacturer:
- Allegro MicroSystems
- Category:
- Angle, Linear Position Measuring
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AAS33051LLEATR.pdf
- Description:
- SINGLE DIE ASIL ANGLE SENSOR WIT
- Quantity:
- Payment:
- Shipping:
Inventory:4,447
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AAS33051LLEATR from Allegro MicroSystems is a single-die, 3.3 V, 14-pin TSSOP contactless 360° angle sensor IC based on circular vertical Hall (CVH) technology. It delivers 12-bit or 15-bit angular position data via SPI, PWM, ABI, or UVW outputs; features on-chip 32-segment linearization and EEPROM (100 write cycles); and targets electronic power steering (EPS), BLDC motor commutation, and transmission actuators in automotive systems.
For engineers reviewing the AAS33051LLEATR datasheet, AAS33051LLEATR pinout, AAS33051LLEATR application, or AAS33051LLEATR equivalent, this page provides verified technical context, real-world output latency (10 µs), ASIL B safety integration guidance, low-power mode current (76 µA @ 25°C), and pin-specific terminal roles for production-ready design-in.
Technical Context
The AAS33051LLEATR implements a system-on-chip architecture with a CVH front end, high-speed ADC, digital signal processing engine, and dual-output path support (ABI/UVW + PWM). Its 32-segment on-chip linearization corrects misalignment and magnetization errors without external calibration hardware.
It supports ASIL B fail-operational operation when integrated per the safety manual, includes logic BIST and CVH self-test (30 ms runtime), and enables programming over SPI or via VCC/PWM pins for pin-constrained systems. The 1 mm thin TSSOP package minimizes air gap to target magnets, improving field coupling at 300 G input.
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-precision rotor position tracking in BLDC control loops. |
| Angle Refresh Rate | 1 µs - ensures sub-microsecond update timing for real-time closed-loop motor control. |
| Response Time | 10 µs - defines maximum latency between magnetic field change and valid ABI/UVW output, critical for fast-acting EPS systems. |
| Operating Voltage | 3.7–18 V - supports direct 12 V battery connection with ISO 7637-2 Pulse 5b tolerance up to 39 V. |
| Supply Current (Full) | 15–19 mA - determines thermal budget and regulator sizing in compact automotive modules. |
| Low-Power Mode Current | 76 µA @ 25°C - enables persistent turns counting during vehicle off-state with minimal battery drain. |
| Temperature Range | –40°C to +150°C - qualified for under-hood automotive placement without derating. |
| EEPROM Endurance | 100 read/write cycles - sufficient for factory calibration and limited field reprogramming of linearization parameters. |
Pinout & Package
Package: 14-pin TSSOP (suffix LE), 1 mm profile, lead-free with 100% matte tin plating. Exposed pad absent (single-die version).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| BYP_1 | External bypass capacitor terminal | Stabilizes internal 3.3 V regulator; requires 0.1 µF ceramic capacitor to ground for noise immunity. |
| VCC_1 | Main power supply input | Accepts 3.7–18 V; powers all internal blocks including CVH, ADC, and digital logic. |
| WAKE_1 | External wake-up signal input | Active-low trigger enabling exit from low-power mode; supports system-level sleep/wake coordination. |
| PWM_1 | Pulse-width modulated angle output | Duty cycle proportional to angle (5–95% = 0–360°); reserved states indicate diagnostics (e.g., 10.625% = EEPROM uncorrectable error). |
| GND | Ground reference (pins 5, 6, 7) | Three dedicated ground pins reduce impedance and improve noise rejection in noisy automotive environments. |
| CS_1 | SPI chip-select input | Active-low enable for SPI communication; also serves as address select for Manchester interface. |
| SCLK_1 | SPI clock input | Supports up to 10 MHz clock rate; determines maximum SPI frame rate (5.8–588 kHz). |
| MOSI_1 | SPI data input | Accepts configuration writes, EEPROM commands, and register updates; doubles as Manchester address line. |
| MISO_1 | SPI data output | Transmits angle data, diagnostics, and status flags; includes 4-bit CRC for error detection. |
| A_1/U_1 | Quadrature A or U-phase output | Selectable ABI or UVW mode; provides high-resolution incremental position feedback for motor control. |
| B_1/V_1 | Quadrature B or V-phase output | Complements A_1/U_1; phase quadrature enables direction detection and interpolation. |
| I_1/W_1 | Index or W-phase output | Provides absolute reference pulse per revolution (ABI) or third commutation phase (UVW). |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 32-segment linearization | Compensates for mechanical misalignment and magnet imperfections without external lookup tables or host CPU overhead. |
| ASIL B SEooC compliance | Validated per ISO 26262 for safety-critical use when integrated per the AAS33051 Safety Manual - eliminates need for redundant sensor hardware in some EPS architectures. |
| Multi-format outputs (SPI/PWM/ABI/UVW) | Enables drop-in replacement across legacy resolver-to-digital converters and incremental encoder interfaces without redesigning host MCU firmware. |
| Low-power mode with turns counter | Maintains absolute motor position during vehicle shutdown using <76 µA quiescent current - avoids recalibration at next ignition cycle. |
| VCC/PWM pin programming | Allows full EEPROM configuration (calibration, linearization, output mode) using only VCC and PWM pins - ideal for post-assembly calibration in space-constrained modules. |
| Diagnostic coverage (LBIST, CVH self-test, watchdogs) | Meets ASIL B diagnostic requirements with 30 ms self-test runtime and configurable execution on power-up or command. |
Applications
| Electronic Power Steering (EPS) | Brushless DC Motor Commutation |
|---|---|
Use Scenario: Real-time rotor angle feedback for field-oriented control (FOC) in column-assist or rack-assist EPS motors. IC Role / Device Role / Timing Role: Primary angle sensor providing 10 µs latency ABI/UVW outputs synchronized to motor electrical cycles. Use Value: Enables precise torque vectoring and smooth assist response while meeting ASIL B functional safety requirements without dual-sensor redundancy. |
Use Scenario: Six-step or FOC commutation of high-efficiency BLDC pumps in HVAC, cooling, or brake-by-wire systems. IC Role / Device Role / Timing Role: UVW output directly drives gate drivers; 12-bit resolution supports >1000 RPM operation with <1.38° hysteresis. Use Value: Eliminates need for external position decoding logic and reduces MCU interrupt load through hardware-synchronized phase outputs. |
| Transmission Actuator Position Sensing | Electric Parking Brake (EPB) |
Use Scenario: Monitoring gear selector or clutch actuator shaft rotation in automated manual transmissions (AMT). IC Role / Device Role / Timing Role: Contactless 360° angle measurement with on-chip linearization correcting for housing warpage-induced misalignment. Use Value: Achieves ±0.4° accuracy at 25°C and <1.4° drift over lifetime - meets tight mechanical tolerancing requirements without costly mechanical calibration. |
Use Scenario: Detecting caliper piston rotation and absolute position during parking brake engagement and release. IC Role / Device Role / Timing Role: Dual-role sensor: PWM provides initial position on wake-up; ABI maintains high-resolution tracking during motion. Use Value: Combines fast startup (PWM) and precision (ABI) in one device, reducing BOM count and PCB area versus discrete solutions. |
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 | Dual-die 24-pin eTSSOP; supports ASIL D; includes second independent die with full SPI/ABI/UVW/PWM channels. | Required for redundant sensor architectures (e.g., dual-channel EPS) where fault containment and channel independence are mandatory. | Select AAS33051LLPBTR-DD only if ASIL D compliance or hardware redundancy is required; not pin-compatible with AAS33051LLEATR due to different pin count and layout. |
| A1339LLETR | Legacy single-die 14-pin TSSOP; no on-chip linearization; SPI-only output; lower diagnostic coverage; 12-bit fixed resolution. | Suitable for cost-sensitive, non-safety-critical applications where magnet alignment is tightly controlled and field strength >300 G is guaranteed. | A1339LLETR is pin-compatible and offers migration path, but lacks linearization, PWM, ABI/UVW, and ASIL B support - requires host-side compensation and additional interface logic. |
Compared with AAS33051LLPBTR-DD, AAS33051LLEATR reduces PCB area and cost by 42% (14 vs. 24 pins) while retaining ASIL B capability; compared with A1339LLETR, it adds on-chip linearization, multi-output flexibility, and safety diagnostics - enabling higher system accuracy and reduced software overhead.
Availability
AAS33051LLEATR is available at Aetrix Electronics and suitable for electronic power steering (EPS), brushless DC motor commutation, and transmission actuator applications requiring stable component supply, automotive-grade reliability, and ASIL B safety integration support.
Supply support for AAS33051LLEATR 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, headquartered in Manchester, NH, with global manufacturing and support infrastructure.
The AAS33051 product line delivers precision contactless angle sensing for automotive safety-critical systems, combining CVH technology, on-chip linearization, and ASIL-compliant diagnostics to replace resolvers and optical encoders in EPS, EPB, and transmission controls.
FAQ
What is the operating voltage range for the AAS33051LLEATR?
The AAS33051LLEATR operates from 3.7 V to 18 V, with an absolute maximum rating of 28 V continuous. It supports direct connection to a 12 V automotive battery and withstands ISO 7637-2 Pulse 5b transients up to 39 V. This wide input range ensures robustness in harsh automotive environments where supply voltage fluctuates significantly during cranking and load dump events. The internal regulator maintains stable 3.3 V operation for digital logic regardless of input variation.
Does the AAS33051LLEATR support ASIL B compliance out of the box?
The AAS33051LLEATR is developed as an ASIL B safety element out of context (SEooC) per ISO 26262, but achieving ASIL B in a final system depends on correct integration per the AAS33051 Safety Manual. It includes LBIST, CVH self-test, watchdogs, and 4-bit SPI CRC - all required for ASIL B diagnostic coverage. However, system-level validation, fault tree analysis, and proper hardware/software partitioning remain the customer's responsibility. The AAS33051LLEATR itself is not certified; it is a building block for ASIL B systems.
How does the on-chip 32-segment linearization in the AAS33051LLEATR improve accuracy?
The AAS33051LLEATR's on-chip 32-segment linearization corrects systematic angle errors caused by magnet-to-sensor misalignment or imperfect magnet magnetization - both common in production assemblies. It applies piecewise correction to raw CVH output before final angle calculation, reducing typical angle error from ±1.0° to ±0.4° at 25°C and 300 G. This eliminates the need for external calibration hardware or host MCU-based lookup tables, lowering system cost and improving field reliability without sacrificing resolution or bandwidth.
Can the AAS33051LLEATR be programmed after soldering onto the PCB?
Yes, the AAS33051LLEATR supports post-assembly programming via its VCC and PWM pins using the Manchester interface - no dedicated programming header or extra pins required. This allows factory calibration, linearization parameter loading, and output mode configuration even when only ABI/UVW and PWM signals are routed. The process uses voltage-level modulation on VCC and is fully documented in the AAS33051 datasheet, enabling efficient in-line calibration without adding test fixtures or modifying board layout for programming access.
What is the purpose of the turns counter feature in the AAS33051LLEATR?
The turns counter in the AAS33051LLEATR tracks absolute motor revolutions during vehicle off-state using ultra-low-power mode (<76 µA at 25°C). It retains position data across ignition cycles, eliminating the need for homing routines at startup. The counter value can be read via SPI or written back externally after power loss, ensuring continuous position awareness for applications like electric parking brakes and transmission actuators where knowing exact shaft position is critical for safety and functionality.
AAS33051LLEATR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- 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:
- 14-TSSOP
AAS33051LLEATR FAQ
1.How can I place an order for AAS33051LLEATR through Aetrix?
Please submit a Request for Quotation (RFQ) for AAS33051LLEATR 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 AAS33051LLEATR reliable?
The price and inventory of AAS33051LLEATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AAS33051LLEATR is usually 5 days.
3.What payment methods are accepted for AAS33051LLEATR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AAS33051LLEATR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AAS33051LLEATR?
AAS33051LLEATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AAS33051LLEATR 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 AAS33051LLEATR?
For technical support, including AAS33051LLEATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AAS33051LLEATR requirements.
6.How does Aetrix verify that AAS33051LLEATR is sourced from the original manufacturer or authorized distributors?
All AAS33051LLEATR 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 AAS33051LLEATR meets industry standards.
7.What is the process for return or replacement of AAS33051LLEATR?
All AAS33051LLEATR units undergo pre-shipment inspection (PSI). If there is an issue with AAS33051LLEATR, 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 AAS33051LLEATR part is unused and in its original packaging.
Return procedure for AAS33051LLEATR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AAS33051LLEATR Tags
-
TLV493DA1B6HTSA2
Infineon Technologies
-
EVW-AE4001B14
Panasonic Electronic Components
-
3382G-1-103G
Bourns Inc.
-
TLE5501E0001XUMA1
Infineon Technologies
-
HAL830UT-A
TDK-Micronas GmbH
-
TLE5009E1000FUMA1
Infineon Technologies
-
TLE5501E0002XUMA1
Infineon Technologies
-
HAL3725DJ-A
TDK-Micronas GmbH
-
HAL3727DJ-A
TDK-Micronas GmbH
-
HMC1501-TR
Honeywell Aerospace
-
HMC1512-TR
Honeywell Aerospace
-
AAS33001LLEATR-5
Allegro MicroSystems
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
