A3280LLT-T Equivalent & Substitute Parts

Part Overview

The A3280LLT-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 capability, designed for applications requiring magnetic field detection and switching. The product is currently obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute components must maintain functional compatibility across sensing range, output characteristics, and operating parameters.

Substiute Parts

A3280LLT-T

Allegro MicroSystemsIn Stock: 982A3280LLT-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 A3280LLT-T are selected based on the following critical parameters that determine functional compatibility:

Core Compatibility Criteria:

• Function: Latch operation
• Technology: Hall Effect magnetic sensing
• Polarization: South Pole detection
• Output Type: Open Collector
• Mounting Type: Surface Mount
• Package Compatibility: TO-243AA or variant
• Operating Temperature Range: -40°C ~ 150°C minimum
• Supply Voltage Overlap: Minimum 4.2V operation capability

Substitution Logic: The SS561AT and SS566AT are manufacturer-recommended substitutes that maintain the latch function and Hall Effect technology with open collector output. Both parts operate across the required temperature range and support the TO-243AA package family. The primary differences between substitutes relate to sensing range specifications, which determine application suitability based on magnetic field strength requirements.

Parameter Comparison

Engineering Selection Recommendations

SS561AT Selection: The SS561AT is suitable for applications where the magnetic field strength requirement aligns with an 8.5mT trip threshold. This substitute provides active product status with RoHS compliance and extended supply voltage range (3.8V ~ 30V). The increased output current capability (50mA maximum) accommodates higher load requirements compared to the original A3280LLT-T specification.

SS566AT Selection: The SS566AT is appropriate for applications requiring higher magnetic field sensitivity threshold at 18mT trip point. This substitute also maintains active product status and RoHS compliance with equivalent supply voltage and output current specifications to the SS561AT. Selection between SS561AT and SS566AT depends on the specific magnetic field strength present in the application environment.

Compliance Considerations: Both substitute parts maintain RoHS compliance and unlimited moisture sensitivity rating (MSL 1), ensuring compatibility with standard manufacturing and storage conditions. The extended operating temperature range (-40°C ~ 150°C) matches the original component specification.

Frequently Asked Questions (FAQ)

Q: Can SS561AT or SS566AT directly replace A3280LLT-T in existing designs? A: Both parts maintain the same latch function, Hall Effect technology, open collector output, and TO-243AA package family compatibility. The primary design consideration is the sensing range difference. Verify that the magnetic field strength in your application matches the trip threshold of the selected substitute (8.5mT for SS561AT or 18mT for SS566AT).

Q: What is the difference between SS561AT and SS566AT? A: The primary difference is the sensing range specification. SS561AT operates at 8.5mT trip threshold, while SS566AT operates at 18mT trip threshold. Both maintain identical supply voltage range, output current capability, operating temperature range, and package compatibility. Selection depends on the magnetic field strength present in the application.

Q: Are there packaging differences between the original and substitute parts? A: The A3280LLT-T uses SOT-89-3 packaging, while SS561AT and SS566AT use SOT-89B packaging. Both are TO-243AA variants with compatible pinout and surface mount characteristics. Verify PCB footprint compatibility before implementation.

Q: Do the substitute parts require circuit modifications? A: The increased output current capability (50mA for substitutes versus 25mA for original) and extended supply voltage range (3.8V ~ 30V for substitutes versus 4.2V ~ 24V for original) are backward compatible. No circuit modifications are required if the original design operated within these parameters.

Q: What is the inventory status of substitute parts? A: SS561AT has 2980 pieces in stock (Tape & Reel packaging), and SS566AT has 5284 pieces in stock (Cut Tape packaging). Both are active products with ongoing availability.