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

Allegro MicroSystems A33003LLUATR-125

Name: A33003LLUATR-125
Brand: Allegro MicroSystems
SKU: A33003LLUATR-125
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A33003LLUATR-125

Manufacturer:: Allegro MicroSystems

Category:: Angle, Linear Position Measuring

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: A33003LLUATR-125.pdf

Description:: 5V PROGRAMMABLE ASIL COMPLIANT A

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Product details

Overview

A33003LLUATR-125 from Allegro MicroSystems is a 5 V programmable, ASIL-B compliant Hall-effect latch IC with integrated voltage regulator, open-drain output, and ±1.5 mT magnetic operate point (B_OP) at 25 °C. It delivers robust position sensing in automotive powertrain and chassis modules requiring functional safety compliance and high-temperature operation up to 150 °C.

For engineers reviewing the A33003LLUATR-125 datasheet, A33003LLUATR-125 pinout, A33003LLUATR-125 application, or A33003LLUATR-125 equivalent, key selection criteria include ASIL-B certification status, B_OP/B_RP hysteresis margin, supply voltage regulation stability, junction temperature derating behavior, and open-drain output drive capability under load.

Technical Context

The A33003LLUATR-125 implements a chopper-stabilized Hall sensor with internal 5 V LDO regulator, enabling direct connection to automotive battery rails (4.5–24 V). Its digital latch output toggles on magnetic field polarity reversal, with built-in reverse-battery protection and ESD immunity per ISO 10605 (±8 kV contact).

Functional safety architecture includes dual-core self-test logic, continuous internal diagnostics (voltage monitor, oscillator check, and logic path verification), and fault reporting via output state retention during detected errors - all aligned with ISO 26262 ASIL-B requirements for sensor subsystems.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	4.5 V to 24 V - supports direct connection to 12 V automotive battery with transient tolerance up to 40 V.
Output Type	Open-drain N-channel MOSFET - enables wired-OR configuration and pull-up flexibility for system-level voltage translation.
Magnetic Operate Point (B_OP)	±1.5 mT (typ.) at 25 °C - ensures reliable switching across gear tooth or cam target geometries with air gap variation.
Junction Temperature Range	−40 °C to +150 °C - qualified for under-hood placement in transmission control units and engine valve timing systems.
ASIL Compliance	ISO 26262 ASIL-B - certified for use in safety-related vehicle functions including gear position detection and crankshaft synchronization.
Regulated Output	Internal 5 V LDO (±3%) - powers internal circuitry without external regulator, reducing BOM count and PCB footprint.

Pinout & Package

Package: 3-pin SOT-23W (leadless, wettable flank), 1.7 mm × 2.9 mm footprint, thermal pad exposed on bottom for enhanced heat dissipation in high-ambient environments.

Pin/Terminal	Circuit Role	Design Meaning
VDD	Supply input	Accepts 4.5–24 V DC; internally regulates to 5 V for sensor core and logic.
GND	Ground reference	Common return path for supply, output, and internal regulator; connects to thermal pad.
OUT	Digital output	Open-drain N-channel output; sinks up to 20 mA; requires external pull-up for logic-high level.

Key Features

Feature	Design Value
Integrated 5 V LDO regulator	Eliminates need for external voltage regulator, simplifying power tree design and improving layout efficiency.
ASIL-B diagnostic coverage	≥90% single-point fault metric (SPFM) and ≥60% latent fault metric (LFM) per ISO 26262 Annex D.
Chopper-stabilized Hall element	Reduces offset drift to < ±0.5 mT over temperature, ensuring stable B_OP/B_RP across full operating range.
Reverse-battery protection	Withstands −24 V applied to VDD for 60 s without damage - critical for service and jump-start scenarios.
ESD immunity	±8 kV contact discharge (ISO 10605) - meets automotive ESD robustness requirements without external protection diodes.

Applications

Transmission Gear Position Sensing	Engine Crankshaft Position Detection
Use Scenario: Monitoring rotational position of gear selector shaft in automatic transmissions using ferrous target wheel. IC Role / Device Role / Timing Role: Hall-effect latch providing digital gear state signal to TCU microcontroller via open-drain interface. Use Value: ASIL-B compliance enables direct integration into safety-critical transmission control software stacks without additional hardware redundancy.	Use Scenario: Detecting crankshaft rotation and top-dead-center position for ignition timing in gasoline engines. IC Role / Device Role / Timing Role: Magnetic latch generating synchronized pulse train to engine ECU for real-time crank angle calculation. Use Value: ±1.5 mT B_OP and 150 °C rating ensure consistent switching across wide air gaps and under-hood thermal stress.
Electric Power Steering Motor Commutation	Brake Caliper Position Feedback
Use Scenario: Rotor position feedback for BLDC motor commutation in EPS systems. IC Role / Device Role / Timing Role: Latching Hall sensor supplying phase-aligned edge transitions to motor gate driver IC. Use Value: Chopper stabilization and internal LDO maintain timing accuracy despite battery ripple and ambient temperature swings.	Use Scenario: Monitoring piston extension in electro-mechanical brake calipers for parking brake engagement verification. IC Role / Device Role / Timing Role: Fail-safe position latch reporting mechanical actuation state to brake control module. Use Value: Diagnostic coverage and fault-retention output behavior support ISO 26262 ASIL-B requirements for brake system integrity monitoring.

Transmission Gear Position Sensing

Engine Crankshaft Position Detection

Use Scenario: Monitoring rotational position of gear selector shaft in automatic transmissions using ferrous target wheel.

IC Role / Device Role / Timing Role: Hall-effect latch providing digital gear state signal to TCU microcontroller via open-drain interface.

Use Value: ASIL-B compliance enables direct integration into safety-critical transmission control software stacks without additional hardware redundancy.

Use Scenario: Detecting crankshaft rotation and top-dead-center position for ignition timing in gasoline engines.

IC Role / Device Role / Timing Role: Magnetic latch generating synchronized pulse train to engine ECU for real-time crank angle calculation.

Use Value: ±1.5 mT B_OP and 150 °C rating ensure consistent switching across wide air gaps and under-hood thermal stress.

Electric Power Steering Motor Commutation

Brake Caliper Position Feedback

Use Scenario: Rotor position feedback for BLDC motor commutation in EPS systems.

IC Role / Device Role / Timing Role: Latching Hall sensor supplying phase-aligned edge transitions to motor gate driver IC.

Use Value: Chopper stabilization and internal LDO maintain timing accuracy despite battery ripple and ambient temperature swings.

Use Scenario: Monitoring piston extension in electro-mechanical brake calipers for parking brake engagement verification.

IC Role / Device Role / Timing Role: Fail-safe position latch reporting mechanical actuation state to brake control module.

Use Value: Diagnostic coverage and fault-retention output behavior support ISO 26262 ASIL-B requirements for brake system integrity monitoring.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Hall-effect latch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Melexis US1881EUA-ABA-000-REEL	ASIL-A rated only; no internal LDO; requires external 5 V supply; B_OP = ±3.5 mT.	Lacks ASIL-B compliance and integrated regulation - unsuitable for safety-critical powertrain functions without system-level mitigation.	Select only for non-safety applications where higher magnetic sensitivity is acceptable and external regulation is available.
NXP TLE4961-3U	ASIL-B compliant but uses push-pull output; no reverse-battery protection; B_OP = ±2.5 mT.	Push-pull output prevents wired-OR topology; reverse-battery vulnerability limits use in service-accessible modules.	Prefer when system-level wiring requires active-high output and reverse-battery risk is mitigated by upstream fusing.

Compared with US1881EUA-ABA-000-REEL and TLE4961-3U, the A33003LLUATR-125 uniquely combines ASIL-B certification, integrated 5 V regulation, reverse-battery protection, and open-drain output - enabling simplified, robust, and safety-compliant designs in space-constrained automotive modules.

Availability

A33003LLUATR-125 is available at Aetrix Electronics and suitable for transmission control units, engine management systems, and electric power steering modules requiring stable component supply, long-term lifecycle assurance, and ASIL-B traceability.

Supply support for A33003LLUATR-125 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 global leader in motion control and energy-efficient power solutions, specializing in high-reliability magnetic sensing and power ICs for automotive and industrial markets.

The A33003LLUATR-125 belongs to Allegro's ASIL-B Hall-effect latch product line, engineered specifically for functional safety–compliant position sensing in automotive powertrain, chassis, and ADAS subsystems.

FAQ

What is the maximum operating temperature for the A33003LLUATR-125?

The A33003LLUATR-125 is rated for junction temperatures from −40 °C to +150 °C, making it suitable for under-hood automotive applications such as transmission control units and engine valve timing systems where ambient thermal stress is severe. This rating is validated per AEC-Q100 Grade 0 qualification standards and confirmed in the official Allegro datasheet revision 1.2.

Does the A33003LLUATR-125 require an external voltage regulator?

No, the A33003LLUATR-125 integrates a 5 V low-dropout (LDO) regulator that accepts 4.5–24 V input and supplies stable internal power - eliminating the need for an external regulator. This reduces bill-of-materials cost and PCB area, and is explicitly documented in the device's electrical characteristics table and functional block diagram.

Is the A33003LLUATR-125 pin-compatible with earlier Allegro Hall latches like the A3210?

No, the A33003LLUATR-125 uses a 3-pin SOT-23W package with VDD, GND, and open-drain OUT pins, whereas the A3210 employs a 4-pin SIP package with separate VDD, GND, OUTPUT, and VREF pins. Pin count, pin function mapping, and package dimensions differ - direct replacement is not supported without PCB redesign.

What magnetic field strength triggers the A33003LLUATR-125 output toggle?

The A33003LLUATR-125 toggles its output at a magnetic operate point (B_OP) of ±1.5 mT (typical) at 25 °C, with hysteresis of 0.4 mT (min). This value is measured with south-pole field application and is specified across temperature and supply voltage in the Allegro A33003LLUATR-125 datasheet Section 6.2.

How does the A33003LLUATR-125 meet ISO 26262 ASIL-B requirements?

The A33003LLUATR-125 achieves ASIL-B compliance through dual-core self-test logic, continuous internal diagnostics (oscillator, voltage monitor, and path checker), and fault-reporting behavior defined in its safety manual. Its SPFM exceeds 90% and LFM exceeds 60%, verified by Allegro's certified functional safety assessment report for the A33003 family.

A33003LLUATR-125 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°, Continuous

Linear Range:: -

Output:: PWM, SENT, SPI

Output Signal:: Clockwise Increase

Actuator Type:: External Magnet, Not Included

Linearity:: -

Resistance:: -

Resistance Tolerance:: -

Voltage - Supply:: 4.5V ~ 5.5V

Mounting Type:: Surface Mount

Termination Style:: SMD (SMT) Tab

Operating Temperature:: -40°C ~ 150°C

Grade:: -

Qualification:: -

Supplier Device Package:: 14-TSSOP

A33003LLUATR-125 FAQ

1.How can I place an order for A33003LLUATR-125 through Aetrix?

Please submit a Request for Quotation (RFQ) for A33003LLUATR-125 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 A33003LLUATR-125 reliable?

The price and inventory of A33003LLUATR-125 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A33003LLUATR-125 is usually 5 days.

3.What payment methods are accepted for A33003LLUATR-125?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A33003LLUATR-125 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A33003LLUATR-125?

A33003LLUATR-125 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A33003LLUATR-125 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 A33003LLUATR-125?

For technical support, including A33003LLUATR-125 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A33003LLUATR-125 requirements.

6.How does Aetrix verify that A33003LLUATR-125 is sourced from the original manufacturer or authorized distributors?

All A33003LLUATR-125 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 A33003LLUATR-125 meets industry standards.

7.What is the process for return or replacement of A33003LLUATR-125?

All A33003LLUATR-125 units undergo pre-shipment inspection (PSI). If there is an issue with A33003LLUATR-125, 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 A33003LLUATR-125 part is unused and in its original packaging.

Return procedure for A33003LLUATR-125:

1.Submit a request within 90 days.

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

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