A1223LLHLX-T Equivalent & Substitute Parts

Part Overview

The A1223LLHLX-T is a digital switch latch Hall Effect magnetic sensor manufactured by Allegro MicroSystems in SOT-23W surface mount packaging. This latch-type sensor operates with a South Pole polarization, featuring an 18mT trip threshold and -18mT release threshold, with an open drain output suitable for automotive applications. The part is currently in active production status with AEC-Q100 qualification and ROHS3 compliance.

Substitute parts are necessary when the A1223LLHLX-T reaches end-of-life, when inventory constraints occur, or when design requirements necessitate alternative sensing characteristics such as different trip thresholds, supply voltage ranges, or output current capabilities.

Key Parameters

Parameter	A1223LLHLX-T
Manufacturer	Allegro MicroSystems
Function	Latch
Technology	Hall Effect
Polarization	South Pole
Sensing Range (Trip/Release)	18mT / -18mT
Voltage Supply	3V ~ 24V
Current Supply (Max)	4mA
Current Output (Max)	25mA
Output Type	Open Drain
Operating Temperature	-40°C ~ 150°C
Package	SOT-23W
Grade	Automotive
Qualification	AEC-Q100
Product Status	Active

Substitute Part Grouping Explanation

Substitution compatibility for the A1223LLHLX-T is determined by the following critical parameters: Hall Effect technology, open drain output type, automotive grade qualification, AEC-Q100 certification, South Pole polarization, and operating temperature range of -40°C to 150°C.

The substitute parts are grouped into three functional categories:

Unipolar Switch Substitutes (DRV5023 Series): These Texas Instruments parts operate as unipolar switches with South Pole polarization. They maintain open drain output, automotive grade, and AEC-Q100 qualification. Sensing ranges vary from 12mT trip with 1mT release to 24mT trip with 3mT release. Supply voltage ranges extend to 2.7V minimum and 38V maximum, providing broader compatibility than the original part. Current output capability reaches 30mA, exceeding the A1223LLHLX-T specification.

Omnipolar Switch Substitutes (DRV5033 Series): These Texas Instruments parts function as omnipolar switches, detecting both North and South Pole polarization. They maintain open drain output, automotive grade, and AEC-Q100 qualification. Sensing range is ±12mT trip with ±1mT release. Supply voltage and output current specifications match the unipolar DRV5023 series.

Programmable Switch Substitutes (Melexis MLX92232LSE-AAA-002-RE): This part offers programmable function, hysteresis, and trip point configuration. It maintains open drain output, automotive grade qualification, and operates across -40°C to 150°C. Supply voltage range is 2.7V to 24V with 75mA maximum output current.

Unipolar Switch Substitute (Melexis MLX92231LSE-AAA-007-RE): This part functions as a unipolar switch with South Pole polarization, open drain output, and automotive grade qualification. Sensing range is 33mT trip with 14mT release. Supply voltage is 2.7V to 24V with 70mA maximum output current.

Parameter Comparison

Parameter	A1223LLHLX-T	DRV5023AJQDBZRQ1	DRV5023AJQDBZTQ1	DRV5023BIEDBZTQ1	DRV5033AJQDBZRQ1	DRV5033AJQDBZTQ1	MLX92231LSE-AAA-007-RE	MLX92232LSE-AAA-002-RE
Manufacturer	Allegro MicroSystems	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Melexis Technologies NV	Melexis Technologies NV
Technology	Hall Effect	Hall Effect	Hall Effect	Hall Effect	Hall Effect	Hall Effect	Hall Effect	Hall Effect
Function	Latch	Unipolar Switch	Unipolar Switch	Unipolar Switch	Omnipolar Switch	Omnipolar Switch	Unipolar Switch	Programmable
Polarization	South Pole	South Pole	South Pole	South Pole	North Pole, South Pole	North Pole, South Pole	South Pole	-
Sensing Range	18mT / -18mT	12mT / 1mT	±12mT / ±1mT	24mT / 3mT	±12mT / ±1mT	±12mT / ±1mT	33mT / 14mT	-
Voltage Supply	3V ~ 24V	2.7V ~ 38V	2.5V ~ 38V	2.7V ~ 38V	2.7V ~ 38V	2.5V ~ 38V	2.7V ~ 24V	2.7V ~ 24V
Current Supply (Max)	4mA	2.7mA (Typ)	2.7mA (Typ)	2.7mA (Typ)	2.7mA (Typ)	2.7mA (Typ)	4.5mA	3.9mA
Current Output (Max)	25mA	30mA	30mA	30mA	30mA	30mA	70mA	75mA
Output Type	Open Drain	Open Drain	Open Drain	Open Drain	Open Drain	Open Drain	Open Drain	Open Drain
Operating Temperature	-40°C ~ 150°C	-40°C ~ 150°C	-40°C ~ 150°C	-40°C ~ 150°C	-40°C ~ 150°C	-40°C ~ 125°C	-40°C ~ 150°C	-40°C ~ 150°C
Grade	Automotive	Automotive	Automotive	Automotive	Automotive	Automotive	Automotive	Automotive
Qualification	AEC-Q100	AEC-Q100	AEC-Q100	AEC-Q100	AEC-Q100	AEC-Q100	AEC-Q100	AEC-Q100
Product Status	Active	Active	Obsolete	Obsolete	Active	Obsolete	Active	Active
Package	SOT-23W	SOT-23-3	-	-	SOT-23-3	-	TSOT-23-3	TSOT-23-3

Engineering Selection Recommendations

For direct functional replacement with active product status and identical operating temperature range (-40°C to 150°C), the DRV5023AJQDBZRQ1 and DRV5033AJQDBZRQ1 are primary candidates. Both maintain AEC-Q100 qualification, automotive grade, and open drain output. The DRV5023AJQDBZRQ1 provides unipolar South Pole detection with 12mT trip sensitivity, while the DRV5033AJQDBZRQ1 offers omnipolar detection for applications requiring both pole sensitivity.

The MLX92231LSE-AAA-007-RE and MLX92232LSE-AAA-002-RE from Melexis Technologies maintain active product status and full operating temperature range. The MLX92231LSE-AAA-007-RE functions as a unipolar switch with higher trip threshold (33mT) and increased output current capability (70mA). The MLX92232LSE-AAA-002-RE provides programmable configuration for trip point, hysteresis, and function selection with 75mA output current.

Obsolete status parts (DRV5023AJQDBZTQ1, DRV5023BIEDBZTQ1, DRV5033AJQDBZTQ1, DRV5023BIQDBZTQ1, DRV5033AJEDBZTQ1) remain electrically compatible but are not recommended for new designs due to discontinued production.

Frequently Asked Questions (FAQ)

Q: Can the DRV5023 series directly replace the A1223LLHLX-T?

A: The DRV5023 series maintains Hall Effect technology, open drain output, automotive grade, and AEC-Q100 qualification. However, the DRV5023 functions as a unipolar switch rather than a latch, and sensing thresholds differ (12mT trip vs. 18mT trip). Circuit behavior will differ in applications requiring latching functionality.

Q: What is the difference between unipolar and omnipolar detection?

A: Unipolar switches (DRV5023, MLX92231) respond to South Pole magnetic field approach and release. Omnipolar switches (DRV5033) respond to both North and South Pole approach, providing bidirectional detection capability.

Q: Are the DRV5033 omnipolar parts suitable for the A1223LLHLX-T application?

A: The DRV5033 series maintains compatible electrical specifications and certifications. Omnipolar detection provides additional functionality for applications requiring detection of both magnetic poles. Application requirements determine suitability.

Q: What is the significance of product status (Active vs. Obsolete)?

A: Active status indicates current production and long-term availability. Obsolete status indicates discontinued production with limited remaining inventory. New designs should prioritize active status parts for supply chain reliability.

Q: How do the Melexis parts compare to Texas Instruments substitutes?

A: Melexis MLX92231LSE-AAA-007-RE and MLX92232LSE-AAA-002-RE maintain active status and full temperature range. The MLX92231 offers higher trip threshold (33mT) and increased output current (70mA). The MLX92232 provides programmable configuration for customized sensing parameters.

Q: Are package differences between SOT-23W, SOT-23-3, and TSOT-23-3 significant?

A: SOT-23W, SOT-23-3, and TSOT-23-3 are all surface mount packages with compatible pinouts for Hall Effect sensors. Physical dimensions and thermal characteristics may vary. PCB layout verification is necessary when changing package types.

Q: What supply voltage range should be considered for substitution?

A: The A1223LLHLX-T operates from 3V to 24V. All substitute parts support this range, with most extending to 2.7V minimum and several to 38V maximum. Application supply voltage determines which substitutes are compatible.

Q: How do output current specifications affect substitution?

A: The A1223LLHLX-T provides 25mA maximum output current. All substitute parts meet or exceed this specification (30mA to 75mA). Higher output current capability provides design margin for load driving requirements.

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