A3282LLHLT-T Equivalent & Substitute Parts

Part Overview

The A3282LLHLT-T is a digital switch latch Hall Effect magnetic sensor manufactured by Allegro MicroSystems in SOT-23W surface mount packaging. This component operates as an open drain output device with south pole polarization, designed for applications requiring magnetic field detection and switching functionality across industrial and automotive temperature ranges.

The A3282LLHLT-T is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this component.

Key Parameters

Parameter	A3282LLHLT-T
Manufacturer	Allegro MicroSystems
Function	Latch
Technology	Hall Effect
Polarization	South Pole
Sensing Range	15mT Trip, -15mT Release
Voltage Supply	3.6V – 24V
Current Supply (Max)	4.6mA
Current Output (Max)	60mA
Output Type	Open Drain
Operating Temperature	-40°C to 150°C
Package	SOT-23W
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the A3282LLHLT-T is determined by the following critical parameters:

Primary Compatibility Criteria:

Hall Effect technology with open drain output
South pole polarization
Surface mount packaging (SOT-23W or equivalent form factor)
Operating temperature range: -40°C to 150°C minimum
Supply voltage compatibility: 3.6V to 24V overlap required
Output current capability: minimum 60mA

Substitution Categories:

Category 1: Direct Allegro Equivalents (Latch Function) Parts maintaining identical latch function with active product status and automotive qualification. A1222LLHLX-T and A1222LLHLT-T provide direct functional replacement with enhanced supply current specification and automotive-grade certification.

Category 2: Texas Instruments Unipolar Switch Alternatives (DRV5023 Series) Texas Instruments DRV5023 series components provide Hall Effect magnetic sensing with open drain output and south pole polarization. These parts operate as unipolar switches rather than latches, introducing functional differences in switching behavior. Sensing range variations exist across DRV5023 variants (12mT to 24mT trip thresholds). Temperature compensation is included as a standard feature. All DRV5023 variants maintain automotive qualification and AEC-Q100 certification.

Parameter Comparison

Parameter	A3282LLHLT-T	A1222LLHLX-T	A1222LLHLT-T	DRV5023AJEDBZRQ1	DRV5023AJQDBZRQ1	DRV5023BIEDBZRQ1	DRV5023BIQDBZRQ1
Manufacturer	Allegro	Allegro	Allegro	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Function	Latch	Latch	Latch	Unipolar Switch	Unipolar Switch	Unipolar Switch	Unipolar Switch
Technology	Hall Effect	Hall Effect	Hall Effect	Hall Effect	Hall Effect	Hall Effect	Hall Effect
Polarization	South Pole	South Pole	South Pole	South Pole	South Pole	South Pole	South Pole
Sensing Range (Trip)	15mT	15mT	15mT	12mT	12mT	24mT	24mT
Voltage Supply	3.6V – 24V	3V – 24V	3V – 24V	2.7V – 38V	2.7V – 38V	2.7V – 38V	2.7V – 38V
Current Supply (Max)	4.6mA	4mA	4mA	2.7mA (Typ)	2.7mA (Typ)	2.7mA (Typ)	2.7mA (Typ)
Current Output (Max)	60mA	25mA	25mA	30mA	30mA	30mA	30mA
Output Type	Open Drain	Open Drain	Open Drain	Open Drain	Open Drain	Open Drain	Open Drain
Operating Temperature	-40°C to 150°C	-40°C to 150°C	-40°C to 150°C	-40°C to 150°C	-40°C to 150°C	-40°C to 150°C	-40°C to 125°C
Package	SOT-23W	SOT-23W	SOT-23W	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Grade	–	Automotive	Automotive	Automotive	Automotive	Automotive	Automotive
Qualification	–	AEC-Q100	AEC-Q100	AEC-Q100	AEC-Q100	AEC-Q100	AEC-Q100
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Allegro A1222 Series (Recommended Primary Substitutes)

A1222LLHLX-T and A1222LLHLT-T are the preferred substitutes for A3282LLHLT-T applications. Both parts maintain latch function, south pole polarization, and identical 15mT sensing range. Both are active products with automotive-grade classification and AEC-Q100 qualification. A1222LLHLT-T offers higher inventory availability (6950 pcs) compared to A1222LLHLX-T (1309 pcs).

Functional compatibility is complete. Output current specification is reduced to 25mA maximum, which requires circuit-level evaluation for applications demanding the original 60mA output capability.

Texas Instruments DRV5023 Series (Alternative Substitutes)

DRV5023 variants provide Hall Effect magnetic sensing with open drain output and automotive qualification. These components operate as unipolar switches, introducing functional differences from the latch behavior of A3282LLHLT-T.

DRV5023AJEDBZRQ1 and DRV5023AJQDBZRQ1 feature 12mT trip threshold, differing from the 15mT specification of the original part. DRV5023BIEDBZRQ1 and DRV5023BIQDBZRQ1 feature 24mT trip threshold. All DRV5023 variants include temperature compensation and support extended supply voltage range (2.7V to 38V). Output current capability ranges from 30mA, below the original 60mA specification.

Selection of DRV5023 variants requires application-level assessment of switching behavior differences and sensing range compatibility.

Frequently Asked Questions (FAQ)

Q: Can A1222LLHLX-T and A1222LLHLT-T be used interchangeably with A3282LLHLT-T?

A: Both A1222 variants maintain latch function, Hall Effect technology, south pole polarization, and 15mT sensing range. Both are active products with automotive qualification. The primary difference is reduced maximum output current (25mA versus 60mA). Substitution is valid for applications where output current requirements do not exceed 25mA.

Q: What is the functional difference between latch and unipolar switch operation?

A: Latch function maintains output state after magnetic field removal until opposite polarity field is applied. Unipolar switch operation requires continuous magnetic field presence to maintain output state. This functional difference affects circuit behavior and must be evaluated for specific applications.

Q: Are DRV5023 series parts compatible with A3282LLHLT-T?

A: DRV5023 variants provide Hall Effect magnetic sensing with open drain output and automotive qualification. Compatibility depends on application tolerance for unipolar switch behavior and sensing range variations. DRV5023AJEDBZRQ1 and DRV5023AJQDBZRQ1 operate at 12mT trip threshold; DRV5023BIEDBZRQ1 and DRV5023BIQDBZRQ1 operate at 24mT trip threshold. All variants feature output current maximum of 30mA, below the original 60mA specification.

Q: What packaging considerations apply to these substitutes?

A: A3282LLHLT-T, A1222LLHLX-T, and A1222LLHLT-T use SOT-23W packaging. DRV5023 variants use SOT-23-3 packaging. Both are surface mount packages with compatible footprints for standard PCB assembly processes. Verify pinout compatibility with circuit design before implementation.

Q: Which substitute offers the best supply chain availability?

A: A1222LLHLT-T provides highest inventory (6950 pcs). DRV5023BIEDBZRQ1 offers substantial availability (18818 pcs). A1222LLHLX-T and DRV5023AJQDBZRQ1 provide moderate availability (1309 pcs and 4316 pcs respectively).

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the environmental compliance profile of A3282LLHLT-T.

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