A3280LLT Equivalent & Substitute Parts

Part Overview

The A3280LLT 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 south pole polarization, designed for applications requiring latching magnetic detection across industrial temperature ranges. The A3280LLT is classified as obsolete, making identification of functionally equivalent active alternatives necessary for new designs and ongoing production requirements.

Substiute Parts

A3280LLT

Allegro MicroSystemsIn Stock: 983A3280LLT 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 A3280LLT are selected based on strict alignment with core functional and electrical parameters. The primary substitution criteria are:

• Function: Latch operation with Hall Effect technology
• Output Configuration: Open collector output topology
• Polarization: South pole magnetic detection
• Package Compatibility: TO-243AA surface mount form factor
• Temperature Range: -40°C ~ 150°C operating window
• Supply Voltage Compatibility: Overlap with 4.2V ~ 24V range

The identified substitutes (SS561AT and SS566AT) maintain these core parameters while offering active product status and improved compliance characteristics. Differences in sensing range thresholds and maximum output current represent design variations within the latch Hall Effect sensor category and do not preclude functional substitution when application requirements are met.

Parameter Comparison

Engineering Selection Recommendations

Both SS561AT and SS566AT are active products from Honeywell Sensing and Productivity Solutions, providing long-term availability and supply chain stability compared to the obsolete A3280LLT. Both substitutes achieve RoHS compliance, addressing regulatory requirements that the original part does not meet.

SS561AT operates with an 8.5mT sensing threshold and is suitable for applications where the A3280LLT's 4mT sensitivity is not a critical design constraint. This part provides a balanced sensitivity profile with temperature compensation.

SS566AT operates with an 18mT sensing threshold and is appropriate for applications requiring higher magnetic field thresholds or greater immunity to stray magnetic fields. This part also includes temperature compensation.

Both substitutes support the full -40°C ~ 150°C operating temperature range and maintain open collector output topology. The expanded voltage supply range (3.8V ~ 30V) of both substitutes provides additional design flexibility. Increased maximum output current (50mA versus 25mA) accommodates higher load requirements without circuit modification.

Selection between SS561AT and SS566AT depends on application-specific magnetic field sensitivity requirements. Both parts are electrically and mechanically compatible with A3280LLT footprints and mounting requirements.

Frequently Asked Questions (FAQ)

Q: Can SS561AT and SS566AT be used interchangeably with A3280LLT?

A: Both parts maintain functional equivalence as latch-type Hall Effect sensors with open collector output, south pole polarization, and compatible package geometry. Substitution is valid when application magnetic field thresholds align with the respective sensing ranges (8.5mT for SS561AT, 18mT for SS566AT).

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

A: The primary difference is sensing range threshold. SS561AT operates at 8.5mT trip and -8.5mT release, while SS566AT operates at 18mT trip and -18mT release. Both maintain identical supply voltage ranges, output current ratings, temperature ranges, and RoHS compliance status.

Q: Are there packaging differences between the A3280LLT and substitute parts?

A: All three parts use TO-243AA surface mount packaging. SS561AT and SS566AT are designated as TO-243AA variants, indicating minor package geometry variations that remain compatible with standard SOT-89-3 footprints.

Q: What compliance advantages do the substitute parts offer?

A: Both SS561AT and SS566AT are RoHS compliant, whereas the A3280LLT is RoHS non-compliant. This compliance status is relevant for applications subject to RoHS regulations. All three parts maintain REACH unaffected status and EAR99 export classification.

Q: How do the supply voltage ranges compare?

A: The A3280LLT operates from 4.2V to 24V. Both SS561AT and SS566AT operate from 3.8V to 30V, providing a wider operating window and greater design flexibility for variable supply voltage applications.

Q: What is the significance of temperature compensation in the substitute parts?

A: Temperature compensation is a feature listed for both SS561AT and SS566AT. This feature stabilizes sensor performance across the -40°C ~ 150°C operating range, maintaining consistent switching thresholds independent of ambient temperature variations.