A3281LLTTR Equivalent & Substitute Parts

Part Overview

The A3281LLTTR is a digital switch latch Hall Effect magnetic sensor manufactured by Allegro MicroSystems in SOT-89-3 surface mount packaging. This component functions as an open collector output magnetic switch with latch functionality, designed for applications requiring reliable magnetic field detection and switching. The product is currently obsolete, making equivalent substitute parts necessary for ongoing system support and new design implementations.

Substiute Parts

A3281LLTTR

Allegro MicroSystemsIn Stock: 833A3281LLTTR Datasheet

Current PartRFQ

SS561AT

Honeywell Sensing and Productivity SolutionsIn Stock: 3054SS561AT Datasheet

MFR RecommendedRFQ

SS566AT

Honeywell Sensing and Productivity SolutionsIn Stock: 5296SS566AT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the A3281LLTTR are qualified based on the following critical parameters that determine functional compatibility:

Core Compatibility Criteria:

• Technology: Hall Effect digital switch latch
• Polarization: South Pole detection
• Output Type: Open Collector
• Mounting Type: Surface Mount
• Package / Case: TO-243AA or compatible variant
• Operating Temperature Range: -40°C ~ 150°C
• Supply Voltage Range: Must encompass or exceed 4.2V ~ 24V
• Output Current Capacity: Must meet or exceed 25mA

Substitute Parts Identified:

1. SS561AT (Honeywell Sensing and Productivity Solutions) - Sensing Range 8.5mT Trip, -8.5mT Release
2. SS566AT (Honeywell Sensing and Productivity Solutions) - Sensing Range 18mT Trip, -18mT Release

Both substitute parts meet the core compatibility criteria. Selection between them depends on the specific magnetic field threshold requirements of the application.

Parameter Comparison

Engineering Selection Recommendations

SS561AT Selection Criteria:

• Sensing range of 8.5mT Trip, -8.5mT Release provides sensitivity closest to the original A3281LLTTR specification (9mT)
• Active product status ensures ongoing availability and manufacturing support
• RoHS compliant, suitable for applications with environmental or regulatory compliance requirements
• Honeywell Sensing and Productivity Solutions maintains established supply chain presence
• Temperature compensated feature provides enhanced performance stability across the full operating range

SS566AT Selection Criteria:

• Sensing range of 18mT Trip, -18mT Release accommodates applications requiring higher magnetic field thresholds
• Active product status with established supply chain
• RoHS compliant for regulatory compliance applications
• Temperature compensated feature provides enhanced performance stability
• Select when original application magnetic field environment operates at higher threshold levels

Compliance Considerations: Both substitute parts are RoHS compliant, addressing the non-compliance status of the obsolete A3281LLTTR. Both maintain REACH Unaffected status and EAR99 ECCN classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can SS561AT and SS566AT be used interchangeably with A3281LLTTR?

A: Both parts are functionally compatible as open collector Hall Effect latch sensors with identical operating temperature ranges and package compatibility. Selection depends on the specific magnetic field threshold requirements of the application. SS561AT provides sensitivity closer to the original specification, while SS566AT accommodates higher threshold applications.

Q: What is the primary difference between SS561AT and SS566AT?

A: The primary difference is the sensing range. SS561AT operates at 8.5mT Trip, -8.5mT Release, while SS566AT operates at 18mT Trip, -18mT Release. Both parts are otherwise electrically and mechanically equivalent.

Q: Are the package variants compatible with the original A3281LLTTR footprint?

A: Both substitute parts use TO-243AA package variants, maintaining mechanical and electrical compatibility with the original TO-243AA package of the A3281LLTTR. Surface mount mounting type is identical across all three parts.

Q: What are the supply voltage differences between the original and substitute parts?

A: The A3281LLTTR operates at 4.2V ~ 24V, while both SS561AT and SS566AT operate at 3.8V ~ 30V. The substitute parts provide extended voltage range capability, encompassing the original specification with additional headroom.

Q: Do the substitute parts support the same output current as the original?

A: The A3281LLTTR supports 25mA maximum output current. Both SS561AT and SS566AT support 50mA maximum output current, providing double the output current capacity. This enhanced capability is compatible with applications designed for the original 25mA specification.

Q: What is the significance of the RoHS compliance difference?

A: The A3281LLTTR is RoHS non-compliant, while both SS561AT and SS566AT are RoHS compliant. For applications subject to RoHS regulations or environmental compliance requirements, the substitute parts provide compliant alternatives.

Q: Are there packaging format differences between SS561AT and SS566AT?

A: SS561AT is supplied in Tape & Reel (TR) packaging, while SS566AT is supplied in Cut Tape (CT) packaging. Both formats are standard for surface mount components and do not affect electrical or mechanical compatibility.