A3230LLHLT-T Equivalent & Substitute Parts

Part Overview

The A3230LLHLT-T is a bipolar Hall Effect magnetic switch manufactured by Allegro MicroSystems in SOT-23W surface mount packaging. This digital switch component operates as an open drain output device with sensing capability for both north and south pole magnetic fields. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, production continuity, and new project implementations where this functionality is required.

Key Parameters

Parameter	Value
Manufacturer Part Number	A3230LLHLT-T
Manufacturer	Allegro MicroSystems
Category	Magnetic Sensors
Function	Bipolar Switch
Technology	Hall Effect
Polarization	North Pole, South Pole
Sensing Range	2.5mT Trip, -2.5mT Release
Voltage - Supply	3.6V ~ 24V
Current - Supply (Max)	4.6mA
Current - Output (Max)	60mA
Output Type	Open Drain
Operating Temperature	-40°C ~ 150°C (TA)
Mounting Type	Surface Mount
Package / Case	SOT-23W
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the A3230LLHLT-T is determined by the following critical parameters:

Primary Substitution Criteria:

Function: Bipolar Switch (responds to both north and south pole magnetization)
Technology: Hall Effect sensor
Output Type: Open Drain configuration
Sensing Range: Approximately 2.5mT trip and release thresholds
Voltage Supply Range: Minimum 3V to 3.6V lower bound, maximum 24V or higher
Current Output Capacity: Minimum 60mA
Operating Temperature Range: -40°C to 150°C or higher
Mounting Type: Surface Mount
Package Compatibility: SOT-23W or equivalent three-pin surface mount packages (SOT-23-3, SC-59, TO-236-3)

Direct Equivalent: The A1250LLHLX-T from Allegro MicroSystems is the primary direct substitute. It maintains identical functional specifications, sensing range, output type, and temperature range while offering active product status and automotive-grade qualification.

Cross-Manufacturer Alternatives: Substitutes from Texas Instruments (DRV5053 series) and Infineon Technologies (TLE49681MXTSA1) provide Hall Effect magnetic sensing with comparable electrical characteristics. However, these alternatives feature different output types (analog voltage vs. open drain) or different switching functions (latch vs. bipolar), requiring circuit-level evaluation for compatibility.

Parameter Comparison

Parameter	A3230LLHLT-T	A1250LLHLX-T	TLE49681MXTSA1	DRV5053VAQDBZR
Manufacturer	Allegro MicroSystems	Allegro MicroSystems	Infineon Technologies	Texas Instruments
Function	Bipolar Switch	Bipolar Switch	Bipolar Switch	Analog Sensor
Technology	Hall Effect	Hall Effect	Hall Effect	Hall Effect
Polarization	North Pole, South Pole	North Pole, South Pole	North Pole, South Pole	Single Axis
Sensing Range	2.5mT Trip, -2.5mT Release	2.5mT Trip, -2.5mT Release	2.25mT Trip, -2.25mT Release	±9mT
Voltage - Supply	3.6V ~ 24V	3V ~ 24V	3V ~ 32V	2.5V ~ 38V
Current - Supply (Max)	4.6mA	4mA	2.5mA	3.6mA
Current - Output (Max)	60mA	60mA	25mA	2.3mA
Output Type	Open Drain	Open Drain	Open Drain	Analog Voltage
Operating Temperature	-40°C ~ 150°C (TA)	-40°C ~ 150°C (TA)	-40°C ~ 170°C (TJ)	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	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

Tier 1 - Direct Equivalent: The A1250LLHLX-T is the recommended substitute for the A3230LLHLT-T. Both parts are manufactured by Allegro MicroSystems and maintain identical functional specifications, sensing thresholds, output characteristics, and temperature operating range. The A1250LLHLX-T holds active product status and carries AEC-Q100 automotive qualification, providing superior long-term availability and supply chain stability compared to the obsolete A3230LLHLT-T.

Tier 2 - Cross-Manufacturer Bipolar Switch Alternative: The TLE49681MXTSA1 from Infineon Technologies provides bipolar Hall Effect switching with open drain output and comparable sensing range (2.25mT). This part offers extended temperature operation to 170°C and higher supply voltage tolerance (3V ~ 32V). However, the maximum output current is limited to 25mA, which may require circuit redesign if the original 60mA output capacity is critical. This part carries AEC-Q100 qualification and active product status.

Tier 3 - Analog Output Alternatives: The DRV5053 series from Texas Instruments (DRV5053VAQDBZR, DRV5053EAQDBZR, DRV5053CAQDBZR, DRV5053OAQDBZR, DRV5053PAQDBZR, DRV5053RAQDBZR) provides Hall Effect magnetic sensing with analog voltage output rather than digital switching. These parts require signal conditioning and threshold detection circuitry to replicate the digital switching behavior of the A3230LLHLT-T. Selection among DRV5053 variants depends on required sensing range: ±9mT (VAQDBZR), ±18mT (EAQDBZR, RAQDBZR), ±35mT (CAQDBZR, PAQDBZR), or ±73mT (OAQDBZR). All DRV5053 variants feature temperature compensation, 20kHz bandwidth, and AEC-Q100 qualification.

Tier 3 - Latch Function Alternative: The TLE4946KHTSA1 from Infineon Technologies is a latch-type Hall Effect switch with open collector output. This part responds to south pole magnetization only and features a 19mT sensing threshold. The latch function maintains output state until a reverse magnetic field is applied, differing fundamentally from the bipolar switch behavior of the A3230LLHLT-T. This part is suitable only for applications requiring latching behavior and is not recommended as a direct functional replacement.

Frequently Asked Questions (FAQ)

Q: Can the A1250LLHLX-T be used as a direct replacement for the A3230LLHLT-T without circuit modifications?

A: Yes. The A1250LLHLX-T maintains identical electrical specifications, sensing thresholds, output type, and temperature range. No circuit modifications are required. The primary difference is product status: A1250LLHLX-T is active with automotive qualification, while A3230LLHLT-T is obsolete.

Q: What is the difference between the A3230LLHLT-T and the TLE49681MXTSA1?

A: Both are bipolar Hall Effect switches with open drain output and comparable sensing ranges. The TLE49681MXTSA1 offers higher supply voltage tolerance (up to 32V vs. 24V) and extended temperature operation (170°C vs. 150°C). However, the TLE49681MXTSA1 has a maximum output current of 25mA compared to 60mA for the A3230LLHLT-T. Applications requiring high output current must verify compatibility before substitution.

Q: Why are the DRV5053 series listed as alternatives if they have analog output instead of digital switching?

A: The DRV5053 series provides Hall Effect magnetic sensing in compatible surface mount packages with similar supply voltage and temperature ranges. However, they output analog voltage rather than digital switching signals. Substitution requires additional signal conditioning circuitry (comparator or threshold detector) to replicate the digital switching behavior. These parts are listed as alternatives only for designs where analog output can be accommodated.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the environmental compliance of the A3230LLHLT-T.

Q: What is the difference between SOT-23W and SOT-23-3 packaging?

A: SOT-23W is a five-pin surface mount package, while SOT-23-3 (also designated SC-59 or TO-236-3) is a three-pin surface mount package. The A3230LLHLT-T uses SOT-23W, while most substitute parts use three-pin packages. Pin count and layout differences require PCB redesign if substituting between these package types.

Q: Which substitute part has the best long-term availability?

A: The A1250LLHLX-T from Allegro MicroSystems is recommended for long-term availability. It holds active product status, carries AEC-Q100 automotive qualification, and maintains identical specifications to the obsolete A3230LLHLT-T. Cross-manufacturer alternatives (Infineon, Texas Instruments) also have active status but may require circuit-level evaluation for compatibility.

Q: Can the TLE4946KHTSA1 replace the A3230LLHLT-T?

A: No. The TLE4946KHTSA1 is a latch-type switch that responds to south pole magnetization only, fundamentally different from the bipolar switch behavior of the A3230LLHLT-T. It is not suitable as a direct replacement.

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