A3240LLT-T Equivalent & Substitute Parts

Part Overview

The A3240LLT-T is a unipolar Hall Effect magnetic switch manufactured by Allegro MicroSystems in SOT-89-3 surface mount packaging. This component functions as a digital switch with open collector output, designed for magnetic field detection applications. The product is currently obsolete, making equivalent substitute parts necessary for ongoing design requirements and component sourcing.

Key Parameters

Parameter	A3240LLT-T
Manufacturer	Allegro MicroSystems
Function	Unipolar Switch
Technology	Hall Effect
Polarization	South Pole
Sensing Range	5mT Trip, 5mT Release
Voltage Supply	4.2V – 24V
Current Supply (Max)	6mA
Current Output (Max)	25mA
Output Type	Open Collector
Operating Temperature	-40°C – 150°C
Mounting Type	Surface Mount
Package / Case	TO-243AA
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the A3240LLT-T requires evaluation based on the following critical parameters: Hall Effect technology, open collector output type, surface mount packaging compatibility, and operating temperature range. The A3240LLT-T is a unipolar switch detecting south pole magnetic fields with a 5mT sensing threshold. Substitute parts must maintain compatible electrical characteristics including voltage supply range, output current capability, and package form factor.

The substitute parts listed (SS50AT, SS511AT, SS513AT, SS51T) are bipolar Hall Effect switches from Honeywell Sensing and Productivity Solutions. While these parts operate on different polarization principles (detecting both north and south poles), they share the same core technology, output configuration, and physical packaging standards. Substitution is valid where application requirements permit bipolar operation and where the sensing range thresholds align with system specifications.

Parameter Comparison

Parameter	A3240LLT-T	SS50AT	SS511AT	SS513AT	SS51T
Manufacturer	Allegro MicroSystems	Honeywell	Honeywell	Honeywell	Honeywell
Function	Unipolar Switch	Bipolar Switch	Bipolar Switch	Bipolar Switch	Bipolar Switch
Technology	Hall Effect	Hall Effect	Hall Effect	Hall Effect	Hall Effect
Sensing Range	5mT Trip, 5mT Release	17mT Trip, -17mT Release	6mT Trip, -6mT Release	14mT Trip, -14mT Release	14mT Trip, -14mT Release
Voltage Supply	4.2V – 24V	4.5V – 24V	3.8V – 30V	3.8V – 30V	4.5V – 24V
Current Supply (Max)	6mA	10mA	10mA	10mA	10mA
Current Output (Max)	25mA	20mA	20mA	20mA	20mA
Output Type	Open Collector	Open Collector	Open Collector	Open Collector	Open Collector
Operating Temperature	-40°C – 150°C	-40°C – 125°C	-40°C – 150°C	-40°C – 150°C	-40°C – 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-243AA	TO-243AA, Variant	TO-243AA, Variant	TO-243AA, Variant	TO-243AA, Variant
RoHS Status	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

All substitute parts are active products with current manufacturing status and RoHS compliance certification, providing supply chain continuity for applications requiring magnetic switch functionality. Selection among the four substitute options depends on specific sensing range requirements and operating temperature constraints.

SS511AT and SS513AT support the full operating temperature range of -40°C to 150°C, matching the A3240LLT-T specification. SS511AT provides the closest sensing threshold match at 6mT trip point, compared to the original 5mT specification. SS513AT operates at 14mT trip point with temperature compensation features. SS50AT and SS51T are limited to -40°C to 125°C operating range, suitable for applications not requiring the extended upper temperature capability.

All substitute parts maintain open collector output configuration and surface mount packaging compatibility with TO-243AA form factor variants. Output current capability is reduced from 25mA to 20mA across all substitutes, requiring verification in current-limited applications.

Frequently Asked Questions (FAQ)

Q: Can the A3240LLT-T be directly replaced with a bipolar switch substitute?

A: Direct replacement is possible only if the application does not depend on unipolar (south pole only) detection. Bipolar switches respond to both north and south pole magnetic fields. Applications requiring single-pole detection must evaluate whether bipolar operation introduces false triggers or functional conflicts.

Q: Which substitute part most closely matches the A3240LLT-T sensing characteristics?

A: SS511AT provides the closest sensing threshold at 6mT trip point versus the original 5mT specification. SS511AT also supports the full -40°C to 150°C operating temperature range and includes temperature compensation features.

Q: Are there output current limitations when substituting?

A: Yes. The A3240LLT-T supports 25mA maximum output current, while all substitute parts are rated for 20mA maximum output current. Applications drawing near the original 25mA limit must be re-evaluated for compatibility with the reduced 20mA specification.

Q: What is the impact of the operating temperature range difference?

A: SS50AT and SS51T are limited to -40°C to 125°C, while the A3240LLT-T supports -40°C to 150°C. Applications operating above 125°C require SS511AT or SS513AT to maintain full temperature specification compliance.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts use TO-243AA variant packaging, compatible with the original A3240LLT-T surface mount footprint. Packaging variants are noted in supplier device package specifications and should be confirmed during PCB layout verification.

Q: What is the difference between SS511AT and SS513AT?

A: Both parts support -40°C to 150°C operating range and include temperature compensation. SS511AT operates at 6mT trip threshold, while SS513AT operates at 14mT trip threshold. Selection depends on the required magnetic field sensitivity for the application.

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