A3283LLHLT-T Equivalent & Substitute Parts

Part Overview

The A3283LLHLT-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 collector output device with a sensing range of 18mT trip and -18mT release, designed for applications requiring magnetic field detection with latch functionality across an extended temperature range of -40°C to 150°C.

The A3283LLHLT-T is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this magnetic sensor technology.

Key Parameters

Parameter	A3283LLHLT-T
Manufacturer	Allegro MicroSystems
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 to 150°C (TA)
Mounting Type	Surface Mount
Package	SOT-23W
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the A3283LLHLT-T is determined by the following critical parameters:

Function: Latch operation (maintains output state after magnetic field removal)
Technology: Hall Effect magnetic sensing
Polarization: South Pole detection
Output Type: Open Collector configuration
Sensing Range: 18mT trip and -18mT release thresholds
Voltage Supply Range: Compatibility with 4.2V to 24V operation
Current Output Capability: Minimum 25mA output current
Operating Temperature: Support for -40°C to 150°C range
Package: Surface mount SOT-23W or equivalent footprint compatibility
Compliance: ROHS3 compliance requirement

Substitute parts must satisfy all critical parameters to ensure functional equivalence. Parts with different sensing ranges, output types, or temperature ratings represent functional alternatives rather than direct substitutes.

Parameter Comparison

Parameter	A3283LLHLT-T	A1223LLHLX-T	TLE49462KHTSA1	TLI49462KHTSA1
Manufacturer	Allegro MicroSystems	Allegro MicroSystems	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	18mT Trip, -18mT Release	4.6mT Trip, -4.6mT Release	19.2mT Trip, -19.2mT Release
Voltage Supply	4.2V – 24V	3V – 24V	2.7V – 18V	2.7V – 18V
Current Supply (Max)	8mA	4mA	6mA	6mA
Current Output (Max)	25mA	25mA	20mA	20mA
Output Type	Open Collector	Open Drain	Open Collector	Open Drain
Operating Temperature	-40°C to 150°C (TA)	-40°C to 150°C (TA)	-40°C to 150°C (TJ)	-40°C to 125°C (TA)
Package	SOT-23W	SOT-23W	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

A1223LLHLX-T (Allegro MicroSystems) represents the closest functional equivalent to the A3283LLHLT-T. Both devices share identical sensing range (18mT trip, -18mT release), latch function, South Pole polarization, and operating temperature range (-40°C to 150°C). The A1223LLHLX-T is currently in active production status with ROHS3 compliance and AEC-Q100 automotive qualification. The primary difference is output type configuration (open drain versus open collector) and reduced supply current (4mA versus 8mA). This part is recommended for direct replacement in applications where open drain output is compatible with existing circuit design.

TLE49462KHTSA1 (Infineon Technologies) provides an alternative with open collector output matching the A3283LLHLT-T configuration. This device maintains latch function, South Pole polarization, and extended temperature range (-40°C to 150°C). However, the sensing range differs significantly (4.6mT trip versus 18mT trip), requiring circuit-level evaluation for magnetic field detection compatibility. The part is active in production with AEC-Q100 automotive qualification and ROHS3 compliance.

TLI49462KHTSA1 (Infineon Technologies) operates as a unipolar switch rather than a latch device, representing a functional alternative for applications not requiring latch retention. The sensing range (19.2mT trip) approximates the original specification. Operating temperature is limited to -40°C to 125°C, which may not satisfy applications requiring the full -40°C to 150°C range. This part is active in production with AEC-Q100 automotive qualification and ROHS3 compliance.

All substitute parts maintain ROHS3 compliance and surface mount packaging compatibility. Selection should be based on specific application requirements regarding output type (open collector versus open drain), sensing range precision, and temperature operating limits.

Frequently Asked Questions (FAQ)

Q: Can A1223LLHLX-T directly replace A3283LLHLT-T in existing designs?

A: A1223LLHLX-T shares the same sensing range, latch function, and operating temperature range as A3283LLHLT-T. The primary difference is output type: A1223LLHLX-T uses open drain output while A3283LLHLT-T uses open collector. Direct replacement is possible if the circuit design accommodates open drain output configuration. Verify pull-up resistor values and load impedance compatibility.

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

A: Both output types function as switches to ground. Open collector typically refers to bipolar transistor output stages, while open drain refers to MOSFET output stages. From a circuit perspective, both require external pull-up resistors to establish logic levels. Compatibility depends on circuit design rather than fundamental functional differences.

Q: Why does TLE49462KHTSA1 have a different sensing range than A3283LLHLT-T?

A: TLE49462KHTSA1 is designed for applications requiring higher magnetic field sensitivity (4.6mT trip versus 18mT trip). This represents a different product variant optimized for different magnetic field detection requirements. Selection should be based on the specific magnetic field strength present in the target application.

Q: Is TLI49462KHTSA1 suitable as a substitute if latch function is not required?

A: TLI49462KHTSA1 operates as a unipolar switch rather than a latch device. It is suitable only for applications where output state does not need to be retained after magnetic field removal. The sensing range (19.2mT trip) approximates the original specification, but the operating temperature range is limited to -40°C to 125°C.

Q: Are all substitute parts automotive qualified?

A: A1223LLHLX-T, TLE49462KHTSA1, and TLI49462KHTSA1 all carry AEC-Q100 automotive qualification. This certification indicates compliance with automotive industry reliability and quality standards.

Q: What packaging considerations apply to these substitute parts?

A: A1223LLHLX-T maintains SOT-23W packaging identical to A3283LLHLT-T. TLE49462KHTSA1 and TLI49462KHTSA1 use TO-236-3, SC-59, or SOT-23-3 packaging, which provides compatible footprints for surface mount applications. Verify PCB layout compatibility before design implementation.

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