A3283LLHLT Equivalent & Substitute Parts

Part Overview

The A3283LLHLT is a digital switch latch Hall Effect magnetic sensor manufactured by Allegro MicroSystems in SOT-23W surface mount packaging. This component functions as an open collector magnetic switch with latch operation, designed for applications requiring magnetic field detection and switching control. The product is currently obsolete, making equivalent substitute parts necessary for new designs, maintenance, and production continuity. Substitute components must maintain functional compatibility through matching Hall Effect technology, latch operation mode, and compatible electrical parameters within the specified operating ranges.

Key Parameters

Parameter	A3283LLHLT
Manufacturer	Allegro MicroSystems
Category	Magnetic Sensors
Function	Latch
Technology	Hall Effect
Polarization	South Pole
Sensing Range	18mT Trip, -18mT Release
Voltage - Supply	4.2V ~ 24V
Current - Supply (Max)	8mA
Current - Output (Max)	25mA
Output Type	Open Collector
Operating Temperature	-40°C ~ 150°C (TA)
Mounting Type	Surface Mount
Package / Case	SOT-23W
RoHS Status	RoHS non-compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the A3283LLHLT is determined by the following critical parameters:

Primary Compatibility Criteria:

Technology: Hall Effect digital switch
Function: Latch operation mode
Polarization: South Pole detection
Output Type: Open Collector configuration
Mounting: Surface mount package
Operating Temperature Range: Minimum -40°C to 150°C capability
Supply Voltage: Overlap with 4.2V ~ 24V range
Output Current: Minimum 25mA capability

Substitute Parts Identified:

TLE49462KHTSA1 (Infineon Technologies) - Primary substitute. Maintains latch function, open collector output, south pole polarization, and extended temperature range (-40°C ~ 150°C). Supports 2.7V ~ 18V supply with 20mA output current. Automotive grade with AEC-Q100 qualification. Active product status with high inventory availability.

TLE49161KHTSA1 (Infineon Technologies) - Secondary substitute. Latch function with open drain output (functionally equivalent to open collector in most applications). South pole polarization. Limited to 2.4V ~ 5V supply range and -40°C ~ 125°C operating temperature. Discontinued at DiGi Electronics.

TLI49462KHTSA1 (Infineon Technologies) - Alternative substitute. Unipolar switch function (differs from latch mode). Open drain output. South pole polarization. Supports 2.7V ~ 18V supply with -40°C ~ 125°C operating temperature. Automotive grade with AEC-Q100 qualification. Active product status.

Parameter Comparison

Parameter	A3283LLHLT	TLE49462KHTSA1	TLE49161KHTSA1	TLI49462KHTSA1
Manufacturer	Allegro MicroSystems	Infineon Technologies	Infineon Technologies	Infineon Technologies
Function	Latch	Latch	Latch	Unipolar Switch
Technology	Hall Effect	Hall Effect	Hall Effect	Hall Effect
Polarization	South Pole	South Pole	South Pole	South Pole
Sensing Range	18mT Trip, -18mT Release	4.6mT Trip, -4.6mT Release	5mT Trip, -5mT Release	19.2mT Trip, -19.2mT Release
Voltage - Supply	4.2V ~ 24V	2.7V ~ 18V	2.4V ~ 5V	2.7V ~ 18V
Current - Supply (Max)	8mA	6mA	10µA	6mA
Current - Output (Max)	25mA	20mA	2mA	20mA
Output Type	Open Collector	Open Collector	Open Drain	Open Drain
Operating Temperature	-40°C ~ 150°C (TA)	-40°C ~ 150°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOT-23W	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Discontinued at DiGi Electronics	Active

Engineering Selection Recommendations

TLE49462KHTSA1 is the primary recommended substitute. This component maintains full functional equivalence with the A3283LLHLT through matching latch operation, open collector output, and extended temperature range (-40°C ~ 150°C). The supply voltage range (2.7V ~ 18V) overlaps the original specification (4.2V ~ 24V) within the 4.2V ~ 18V window. Output current capability (20mA) is slightly reduced from 25mA but remains suitable for most switching applications. The component is active with high inventory availability (25,400 Pcs), carries ROHS3 compliance, and holds AEC-Q100 automotive qualification. Surface mount packaging (TO-236-3, SC-59, SOT-23-3) is compatible with SOT-23W footprints through standard PCB layout adaptation.

TLI49462KHTSA1 serves as an alternative when unipolar switch operation is acceptable. This component shares the same supply voltage range (2.7V ~ 18V) and output current capability (20mA) as TLE49462KHTSA1 but operates as a unipolar switch rather than a latch. Operating temperature is limited to -40°C ~ 125°C. The component is active with automotive qualification (AEC-Q100) and ROHS3 compliance.

TLE49161KHTSA1 is not recommended for new designs due to limited supply voltage range (2.4V ~ 5V), which does not accommodate the original 4.2V ~ 24V specification. Additionally, output current capability (2mA) is insufficient for applications requiring 25mA switching capacity. Product status is discontinued at DiGi Electronics.

Frequently Asked Questions (FAQ)

Q: Can TLE49462KHTSA1 directly replace A3283LLHLT without circuit modifications?

A: TLE49462KHTSA1 maintains functional compatibility through matching Hall Effect technology, latch operation, open collector output, and south pole polarization. Supply voltage overlap (4.2V ~ 18V) and output current capability (20mA) support most applications. Package differences (TO-236-3 versus SOT-23W) require PCB footprint adaptation but do not affect electrical performance.

Q: What is the difference between open collector and open drain outputs?

A: Open collector and open drain are functionally equivalent output configurations. Both require external pull-up resistors and provide switching capability through transistor saturation. Selection between TLE49462KHTSA1 (open collector) and TLE49161KHTSA1 (open drain) depends on circuit design requirements and component availability.

Q: Why does TLE49462KHTSA1 have lower output current (20mA) than A3283LLHLT (25mA)?

A: Output current specifications reflect maximum rated values under defined test conditions. The 5mA reduction in TLE49462KHTSA1 does not eliminate substitution viability for applications requiring less than 20mA switching current. Circuit design must account for actual load requirements.

Q: Is TLI49462KHTSA1 suitable as a substitute despite unipolar switch operation?

A: TLI49462KHTSA1 operates as a unipolar switch rather than a latch. This functional difference affects output behavior: unipolar switches respond to magnetic field presence, while latches maintain state through hysteresis. Substitution is valid only when application logic accommodates unipolar operation.

Q: What are the compliance implications of switching from RoHS non-compliant to ROHS3 compliant components?

A: TLE49462KHTSA1, TLE49161KHTSA1, and TLI49462KHTSA1 all carry ROHS3 compliance, meeting current regulatory requirements for lead-free manufacturing and restricted substance elimination. This upgrade improves environmental compliance and supply chain compatibility with modern manufacturing standards.

Q: Are package differences between SOT-23W and TO-236-3/SC-59 significant?

A: SOT-23W and TO-236-3/SC-59 are surface mount packages with compatible pin configurations and similar physical dimensions. PCB layout adaptation is required, but electrical performance and mounting methodology remain equivalent. Standard design tools support footprint conversion.

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