A3281LLTTR-T Equivalent & Substitute Parts

Part Overview

The A3281LLTTR-T 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 magnetic field detection and switching control. The product is classified as obsolete, making identification of equivalent and substitute parts essential for design continuity and procurement planning.

Substiute Parts

A3281LLTTR-T

Allegro MicroSystemsIn Stock: 979A3281LLTTR-T 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-T are identified based on the following critical parameters that determine functional compatibility:

Core Compatibility Criteria:

• Technology: Hall Effect digital switch latch
• Function: Latch operation
• Polarization: South Pole detection
• Output Type: Open Collector
• Mounting Type: Surface Mount
• Package / Case: TO-243AA or variant
• Operating Temperature Range: -40°C ~ 150°C
• Supply Voltage Range: Overlap with 4.2V ~ 24V
• Output Current Capability: Minimum 25mA

Substitute Parts Identified:

SS561AT (Honeywell Sensing and Productivity Solutions) meets all core compatibility criteria with sensing range of 8.5mT Trip, -8.5mT Release, supply voltage 3.8V ~ 30V, and output current 50mA maximum.

SS566AT (Honeywell Sensing and Productivity Solutions) meets all core compatibility criteria with sensing range of 18mT Trip, -18mT Release, supply voltage 3.8V ~ 30V, and output current 50mA maximum.

Both substitute parts are active products with RoHS compliance and identical operating temperature specifications.

Parameter Comparison

Engineering Selection Recommendations

SS561AT Selection Criteria: SS561AT is suitable for applications where the sensing threshold of 8.5mT Trip, -8.5mT Release is compatible with the original design intent. This substitute provides active product status with current manufacturing support, RoHS compliance, and extended supply voltage range (3.8V ~ 30V). Output current capability of 50mA exceeds the original 25mA specification, providing design margin. Temperature compensated features are included.

SS566AT Selection Criteria: SS566AT is suitable for applications where the sensing threshold of 18mT Trip, -18mT Release is compatible with the original design intent. This substitute provides active product status with current manufacturing support, RoHS compliance, and extended supply voltage range (3.8V ~ 30V). Output current capability of 50mA exceeds the original 25mA specification, providing design margin. Temperature compensated features are included.

Selection Logic: Both substitute parts transition from an obsolete product to active manufacturing status, ensuring long-term availability and supply chain continuity. The choice between SS561AT and SS566AT depends on the magnetic field threshold requirements of the specific application. Both parts maintain identical operating temperature ranges, package compatibility, and compliance certifications as the original A3281LLTTR-T.

Frequently Asked Questions (FAQ)

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

A: Both parts are functionally compatible as Hall Effect latch magnetic sensors with open collector output, surface mount packaging, and identical operating temperature ranges. Selection between them depends on the magnetic field sensing threshold required by the application. SS561AT operates at 8.5mT threshold, while SS566AT operates at 18mT threshold.

Q: What is the difference in sensing range between the substitute parts?

A: SS561AT has a sensing range of 8.5mT Trip, -8.5mT Release. SS566AT has a sensing range of 18mT Trip, -18mT Release. The original A3281LLTTR-T operates at 9mT Trip, -9mT Release. Selection should be based on the magnetic field strength present in the application environment.

Q: Are the substitute parts pin-compatible with the original A3281LLTTR-T?

A: Both SS561AT and SS566AT use TO-243AA package variants, which are compatible with the original TO-243AA package. Surface mount placement and PCB footprint compatibility should be verified during design integration.

Q: What are the compliance and regulatory differences?

A: The original A3281LLTTR-T is ROHS3 Compliant. Both substitute parts (SS561AT and SS566AT) are RoHS Compliant. All three parts are REACH Unaffected and classified as EAR99 for export control purposes. Moisture Sensitivity Level is 1 (Unlimited) for all parts.

Q: Do the substitute parts have improved electrical specifications?

A: Both substitute parts provide enhanced output current capability (50mA maximum versus 25mA original), extended supply voltage range (3.8V ~ 30V versus 4.2V ~ 24V original), and temperature compensated features. Supply current remains comparable at 10mA maximum versus 8mA original.

Q: What is the inventory status of substitute parts?

A: SS561AT has 2980 pieces in stock (Tape & Reel packaging). SS566AT has 5284 pieces in stock (Cut Tape packaging). The original A3281LLTTR-T has 875 pieces available as new original stock but is classified as obsolete.