A3280ELT-T Equivalent & Substitute Parts

Part Overview

The A3280ELT-T is a digital switch latch Hall Effect magnetic sensor manufactured by Allegro MicroSystems in SOT-23W surface mount packaging. This component functions as an open collector output magnetic switch with south pole polarization, designed for applications requiring latching magnetic detection. The product is currently obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

A3280ELT-T

Allegro MicroSystemsIn Stock: 709A3280ELT-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 components for the A3280ELT-T must satisfy the following core substitution criteria:

• Function: Latch operation (magnetic switch with latching behavior)
• Technology: Hall Effect sensing
• Polarization: South pole detection
• Output Type: Open collector configuration
• Mounting: Surface mount technology
• Electrical Compatibility: Supply voltage range overlap and output current capability sufficient for circuit requirements

The identified substitutes are Honeywell Sensing and Productivity Solutions components from the SS5 series: SS561AT and SS566AT. Both maintain the required functional and electrical characteristics while offering enhanced specifications and active product status. These components differ in sensing range thresholds, which determines their application suitability for specific magnetic field detection requirements.

Parameter Comparison

Engineering Selection Recommendations

SS561AT is suitable for applications requiring a sensing threshold of 8.5mT trip and -8.5mT release. This component provides a moderate magnetic field sensitivity level and is recommended for systems where the original A3280ELT-T sensing range of 4mT is not critical to operation. The SS561AT offers extended temperature range coverage (-40°C to 150°C) and temperature compensation, enhancing performance stability across industrial environments.

SS566AT is suitable for applications requiring a sensing threshold of 18mT trip and -18mT release. This component is recommended for systems requiring higher magnetic field thresholds or where magnetic field immunity is a design consideration. Like the SS561AT, it provides extended temperature range and temperature compensation features.

Both substitutes are active products with current manufacturing support, RoHS compliance, and identical supply voltage range overlap with the original component. Package differences (SOT-89B versus SOT-23W) require PCB layout modification but maintain surface mount compatibility. Selection between SS561AT and SS566AT depends solely on the magnetic field detection threshold required by the application circuit.

Frequently Asked Questions (FAQ)

Q: Can SS561AT or SS566AT directly replace A3280ELT-T without circuit modification?

A: Functional replacement is possible with circuit verification. Both substitutes maintain open collector output, south pole polarization, and latch function. However, the different sensing range thresholds (8.5mT and 18mT respectively, versus the original 4mT) require confirmation that the application circuit tolerates these threshold differences. Package differences (SOT-89B versus SOT-23W) necessitate PCB layout changes.

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

A: The primary difference is the magnetic field sensing threshold. SS561AT triggers at 8.5mT, while SS566AT triggers at 18mT. Both maintain identical electrical supply ranges, output current capabilities, and temperature compensation features. Selection depends on the magnetic field strength present in the application environment.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both SS561AT and SS566AT are RoHS Compliant. The original A3280ELT-T is ROHS3 Compliant. All three components meet RoHS regulatory requirements.

Q: What is the impact of package change from SOT-23W to SOT-89B?

A: SOT-89B (TO-243AA variant) is a different surface mount package with different pin spacing and footprint dimensions compared to SOT-23W. PCB redesign is required to accommodate the new package. Pin configuration and functional mapping must be verified against the specific application schematic.

Q: Do the substitute parts support the full voltage range of the original component?

A: The substitute parts support an extended voltage range (3.8V – 30V) compared to the original (4.2V – 24V). The overlap range is 4.2V – 24V, ensuring compatibility within the original operating specification. The extended lower limit (3.8V) and upper limit (30V) provide additional design flexibility.

Q: What does "Temperature Compensated" mean for the substitute parts?

A: Temperature compensation is an internal circuit feature that maintains consistent magnetic field detection thresholds across the operating temperature range. This feature enhances performance stability in applications experiencing temperature variations, providing more predictable sensor behavior compared to non-compensated designs.