A1223LLHLT-T Equivalent & Substitute Parts

Part Overview

The A1223LLHLT-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 open drain output and is qualified to AEC-Q100 automotive standards. The part is currently active in production with 1447 units in stock.

Substitute parts are necessary when the A1223LLHLT-T becomes unavailable, when alternative sensing characteristics are required for specific applications, or when different packaging formats are preferred for manufacturing processes. Texas Instruments and Melexis Technologies offer functionally equivalent magnetic sensor alternatives with comparable electrical specifications and automotive-grade certifications.

Key Parameters

Parameter	A1223LLHLT-T
Manufacturer	Allegro MicroSystems
Function	Latch
Technology	Hall Effect
Polarization	South Pole
Sensing Range	18mT Trip, -18mT Release
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
Packaging Format	Tape & Reel (TR)
Grade	Automotive
Qualification	AEC-Q100
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution compatibility for the A1223LLHLT-T is determined by the following critical parameters: Hall Effect technology, open drain output type, automotive grade qualification (AEC-Q100), operating temperature range (-40°C ~ 150°C), and supply voltage compatibility (3V ~ 24V minimum overlap).

The substitute parts are grouped into three functional categories:

Unipolar Switch Alternatives (DRV5023 Series): These Texas Instruments parts operate as unipolar switches detecting only south pole magnetic fields. They provide temperature-compensated operation and are available in both obsolete and active product status variants. The DRV5023AJQDBZRQ1 is the active production option in SOT-23-3 packaging.

Omnipolar Switch Alternatives (DRV5033 Series): These Texas Instruments parts detect both north and south pole magnetic fields with omnipolar function. The DRV5033AJQDBZRQ1 is the active production option in SOT-23-3 packaging with the highest inventory availability (15854 units).

Programmable Switch Alternative (MLX92232LSE-AAA-002-RE): This Melexis Technologies part offers programmable function, programmable hysteresis, and programmable trip point capabilities in TSOT-23-3 packaging with the largest inventory (89068 units).

Parameter Comparison

Parameter	A1223LLHLT-T	DRV5023AJQDBZRQ1	DRV5033AJQDBZRQ1	MLX92231LSE-AAA-007-RE	MLX92232LSE-AAA-002-RE
Manufacturer	Allegro MicroSystems	Texas Instruments	Texas Instruments	Melexis Technologies NV	Melexis Technologies NV
Function	Latch	Unipolar Switch	Omnipolar Switch	Unipolar Switch	Programmable
Technology	Hall Effect	Hall Effect	Hall Effect	Hall Effect	Hall Effect
Polarization	South Pole	South Pole	North Pole, South Pole	South Pole	-
Voltage Supply	3V ~ 24V	2.7V ~ 38V	2.7V ~ 38V	2.7V ~ 24V	2.7V ~ 24V
Current Supply (Max)	4mA	2.7mA (Typ)	2.7mA (Typ)	4.5mA	3.9mA
Current Output (Max)	25mA	30mA	30mA	70mA	75mA
Output Type	Open Drain	Open Drain	Open Drain	Open Drain	Open Drain
Operating Temperature	-40°C ~ 150°C	-40°C ~ 150°C	-40°C ~ 125°C	-40°C ~ 150°C	-40°C ~ 150°C
Package	SOT-23W	SOT-23-3	SOT-23-3	TSOT-23-3	TSOT-23-3
Grade	Automotive	Automotive	Automotive	Automotive	Automotive
Qualification	AEC-Q100	AEC-Q100	AEC-Q100	AEC-Q100	AEC-Q100
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For Direct Functional Replacement with Active Production Status:

The DRV5033AJQDBZRQ1 (Texas Instruments omnipolar switch) provides the most comprehensive substitute with active product status, highest inventory availability (15854 units), and AEC-Q100 qualification. This part detects both north and south pole magnetic fields, extending application flexibility beyond the A1223LLHLT-T latch function. Operating temperature range extends to -40°C ~ 125°C, which covers the majority of automotive applications within the A1223LLHLT-T specification.

The MLX92232LSE-AAA-002-RE (Melexis programmable switch) offers the largest inventory (89068 units) and programmable sensing characteristics, enabling field configuration of trip points and hysteresis. This part maintains active production status and AEC-Q100 qualification with operating temperature range of -40°C ~ 150°C matching the A1223LLHLT-T specification.

For Unipolar South Pole Detection:

The DRV5023AJQDBZRQ1 (Texas Instruments unipolar switch) maintains south pole polarization matching the A1223LLHLT-T and provides active production status with AEC-Q100 qualification. This part is suitable for applications requiring single-pole magnetic field detection.

Packaging Considerations:

The A1223LLHLT-T uses SOT-23W packaging. Substitute parts use SOT-23-3 or TSOT-23-3 packaging formats. Pin compatibility and PCB layout modifications may be required. All substitute parts maintain surface mount mounting type and are available in tape and reel packaging formats suitable for automated assembly.

Frequently Asked Questions (FAQ)

Q: Can the DRV5033AJQDBZRQ1 directly replace the A1223LLHLT-T without circuit modifications?

A: Both parts use open drain output, Hall Effect technology, and AEC-Q100 automotive qualification. However, the A1223LLHLT-T is a latch function while the DRV5033AJQDBZRQ1 is an omnipolar switch. The functional behavior differs: latch function maintains output state until magnetic field reverses, while omnipolar switch output follows magnetic field presence. Circuit design must account for this functional difference. Additionally, package format differs (SOT-23W versus SOT-23-3), requiring PCB layout verification.

Q: What is the difference between unipolar and omnipolar magnetic sensor functions?

A: Unipolar sensors (DRV5023 series) detect only south pole magnetic fields and require field removal to reset output. Omnipolar sensors (DRV5033 series) detect both north and south pole magnetic fields, providing output switching on both field polarities. The A1223LLHLT-T latch function detects south pole for trip and release based on field strength thresholds.

Q: Are all substitute parts qualified to the same automotive standards as the A1223LLHLT-T?

A: All listed substitute parts carry AEC-Q100 automotive qualification and ROHS3 compliance matching the A1223LLHLT-T. All parts are rated for -40°C to 150°C operating temperature range or -40°C to 125°C, covering automotive temperature requirements.

Q: Which substitute part has the best inventory availability?

A: The MLX92232LSE-AAA-002-RE (Melexis programmable switch) has the highest inventory with 89068 units in stock. The DRV5033AJQDBZRQ1 (Texas Instruments omnipolar switch) has 15854 units available. Both parts maintain active production status.

Q: What are the key electrical differences between substitute options?

A: Supply voltage ranges vary: A1223LLHLT-T operates 3V ~ 24V, while DRV5023 and DRV5033 series support 2.7V ~ 38V. Output current capacity differs: A1223LLHLT-T provides 25mA maximum, while substitutes provide 30mA (Texas Instruments) or 70-75mA (Melexis). Supply current consumption is lower in Texas Instruments parts (2.7mA typical) compared to A1223LLHLT-T (4mA maximum).

Q: Can the MLX92232LSE-AAA-002-RE programmable features replace the A1223LLHLT-T latch function?

A: The MLX92232LSE-AAA-002-RE offers programmable trip point, programmable hysteresis, and programmable function capabilities. These features enable configuration of sensing thresholds and output behavior through programming interface. However, latch function is a specific operational mode requiring dedicated hardware implementation. Programmable parts may emulate latch behavior through software configuration depending on available function modes.

Q: Are package format differences critical for substitution?

A: Yes. The A1223LLHLT-T uses SOT-23W packaging while substitutes use SOT-23-3 or TSOT-23-3 formats. Pin count and physical dimensions differ. PCB footprint modifications are required. All parts maintain surface mount mounting type and are available in tape and reel packaging for automated assembly processes.

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