A3213LLHLT Equivalent & Substitute Parts

Part Overview

The A3213LLHLT is an omnipolar magnetic switch manufactured by Allegro MicroSystems, utilizing Hall Effect technology in a SOT-23W surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The A3213LLHLT provides digital switching functionality with open drain output, detecting both north and south pole magnetic fields within a ±7mT trip threshold and ±1mT release threshold.

Key Parameters

Parameter	A3213LLHLT
Manufacturer	Allegro MicroSystems
Function	Omnipolar Switch
Technology	Hall Effect
Polarization	North Pole, South Pole
Sensing Range (Trip/Release)	±7mT / ±1mT
Voltage Supply	2.4V – 5.5V
Current Supply (Max)	2mA
Current Output (Max)	1mA
Output Type	Open Drain
Operating Temperature	-40°C to 150°C
Package	SOT-23W
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS Non-Compliant

Substitute Part Grouping Explanation

Substitution for the A3213LLHLT is determined by the following critical parameters:

Primary Substitution Criteria:

Function type (omnipolar vs. unipolar detection capability)
Sensing range thresholds (trip and release points in millitesla)
Output type (open drain configuration)
Supply voltage compatibility range
Operating temperature range
Package form factor and mounting compatibility

Substitution Categories:

Direct Equivalent (Same Function & Sensing Range): The A3213LLHLT-T from Allegro MicroSystems is the direct equivalent, maintaining identical omnipolar function, ±7mT/±1mT sensing range, and SOT-23W packaging. This part is active and RoHS3 compliant, making it the primary replacement for obsolete A3213LLHLT units.

Functional Alternatives (Different Sensing Range): Texas Instruments DRV5033 series parts provide omnipolar switching with different sensing thresholds (±12mT trip, ±1mT release). These parts maintain omnipolar detection capability and open drain output but operate at higher magnetic field thresholds. The DRV5033AJEDBZRQ1 is active and automotive-qualified.

Partial Compatibility (Unipolar Detection): Texas Instruments DRV5023 series parts function as unipolar switches, detecting only south pole magnetic fields. These parts are not direct functional equivalents due to polarization differences but share Hall Effect technology, open drain output, and similar package options. Sensing ranges vary by variant (12mT or 24mT trip thresholds).

Parameter Comparison

Parameter	A3213LLHLT	A3213LLHLT-T	DRV5033AJEDBZRQ1	DRV5023AJEDBZRQ1	DRV5023BIEDBZRQ1
Manufacturer	Allegro	Allegro	Texas Instruments	Texas Instruments	Texas Instruments
Function	Omnipolar	Omnipolar	Omnipolar	Unipolar	Unipolar
Polarization	N/S Pole	N/S Pole	N/S Pole	S Pole	S Pole
Sensing Range Trip	±7mT	±7mT	±12mT	12mT	24mT
Sensing Range Release	±1mT	±1mT	±1mT	1mT	3mT
Voltage Supply	2.4V – 5.5V	2.4V – 5.5V	2.7V – 38V	2.7V – 38V	2.7V – 38V
Current Supply (Max)	2mA	2mA	2.7mA (Typ)	2.7mA (Typ)	2.7mA (Typ)
Current Output (Max)	1mA	1mA	30mA	30mA	30mA
Output Type	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
Package	SOT-23W	SOT-23W	SOT-23-3	SOT-23-3	SOT-23-3
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	Not Specified	Not Specified	Yes (AEC-Q100)	Yes (AEC-Q100)	Yes (AEC-Q100)

Engineering Selection Recommendations

For Direct Replacement (Recommended Primary Choice): The A3213LLHLT-T is the optimal substitute, providing identical electrical and functional characteristics while offering active product status and RoHS3 compliance. This part maintains the same omnipolar detection capability, sensing thresholds, and SOT-23W package footprint, requiring no circuit redesign.

For New Designs with Extended Supply Voltage Range: The DRV5033AJEDBZRQ1 maintains omnipolar function and comparable sensing range (±12mT trip vs. ±7mT) while supporting extended supply voltage (2.7V to 38V) and automotive qualification (AEC-Q100). The package transitions from SOT-23W to SOT-23-3, requiring PCB layout verification. This part is active and RoHS3 compliant.

For Unipolar Detection Applications: Texas Instruments DRV5023 series parts are suitable only when unipolar (south pole only) detection is acceptable. The DRV5023AJEDBZRQ1 provides 12mT trip threshold, while DRV5023BIEDBZRQ1 provides 24mT trip threshold. All DRV5023 variants offer automotive qualification and extended output current capability (30mA vs. 1mA). Package transition to SOT-23-3 applies.

Compliance Considerations: All recommended active substitutes are RoHS3 compliant and REACH unaffected. The original A3213LLHLT is RoHS non-compliant; migration to compliant alternatives is necessary for new production and regulatory adherence.

Frequently Asked Questions (FAQ)

Q: Can the A3213LLHLT-T be used as a direct drop-in replacement? A: Yes. The A3213LLHLT-T maintains identical electrical specifications, sensing range, and SOT-23W package, requiring no circuit modifications. It is the recommended substitute for obsolete A3213LLHLT units.

Q: What is the difference between omnipolar and unipolar detection? A: Omnipolar switches (A3213LLHLT, A3213LLHLT-T, DRV5033AJEDBZRQ1) detect both north and south pole magnetic fields. Unipolar switches (DRV5023 series) detect only south pole fields. Application requirements determine which type is appropriate.

Q: Why do DRV5023 and DRV5033 parts have different package designations (SOT-23-3 vs. SOT-23W)? A: SOT-23W and SOT-23-3 are distinct package forms. SOT-23W is a wider variant used by Allegro; SOT-23-3 is the standard three-lead SOT-23 used by Texas Instruments. Pin count and footprint differ; PCB layout verification is required when transitioning between these packages.

Q: Are DRV5023 parts suitable replacements for the A3213LLHLT? A: DRV5023 parts are not direct functional equivalents due to unipolar detection capability versus omnipolar. They are suitable only if your application requires south pole detection only. Sensing thresholds also differ (12mT or 24mT vs. ±7mT).

Q: What is the significance of automotive qualification (AEC-Q100)? A: AEC-Q100 qualification indicates the part meets automotive industry reliability and quality standards. Texas Instruments DRV5033 and DRV5023 series parts carry this qualification, making them suitable for automotive applications. The original A3213LLHLT does not specify automotive qualification.

Q: Can I use a part with a higher sensing threshold (e.g., DRV5033 at ±12mT vs. A3213LLHLT at ±7mT)? A: Substitution depends on your application's magnetic field environment. A higher threshold requires stronger magnetic fields to trigger the switch. Verify that your magnet strength and positioning provide sufficient field strength for reliable operation with the higher threshold.

Q: What supply voltage range should I verify when substituting? A: The A3213LLHLT operates at 2.4V to 5.5V. DRV5033 and DRV5023 parts support 2.7V to 38V. If your circuit operates below 2.7V, the A3213LLHLT-T is the only suitable substitute. Extended voltage range parts are compatible with lower voltages but offer additional headroom for variable supply applications.

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