A3280EUA-T Equivalent & Substitute Parts

Part Overview

The A3280EUA-T is a digital switch latch Hall Effect magnetic sensor manufactured by Allegro MicroSystems in a 3-SIP through-hole package. This component functions as an open collector magnetic switch with south pole polarization, designed for applications requiring latching behavior in response to magnetic field detection. The A3280EUA-T is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing production support.

Substiute Parts

A3280EUA-T

Allegro MicroSystemsIn Stock: 1611A3280EUA-T Datasheet

Current PartRFQ

A1220EUA-T

Allegro MicroSystemsIn Stock: 16429A1220EUA-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the A3280EUA-T is based on the following critical parameters that must remain compatible:

• Hall Effect Technology & South Pole Polarization: The substitute must use identical sensing technology and magnetic polarity to maintain functional equivalence in existing circuit designs.
• Latching Function: The substitute must provide the same latch behavior (trip at 4mT, release at -4mT).
• 3-SIP Package & Through-Hole Mounting: Physical form factor and mounting method must match for direct board-level replacement.
• Voltage Supply Range: The substitute must operate within the specified supply voltage window to ensure compatibility with existing power supplies.
• Output Type Compatibility: While the A3280EUA-T uses open collector output, functionally equivalent open drain output is acceptable in most applications due to similar electrical behavior.
• Operating Temperature Range: The substitute must support the full -40°C to 85°C operating window.

The A1220EUA-T meets all substitution criteria as an active product from the same manufacturer with identical sensing characteristics, package, and thermal specifications.

Parameter Comparison

Engineering Selection Recommendations

The A1220EUA-T is the direct substitute for the obsolete A3280EUA-T. Key advantages of this substitution include:

• Active Product Status: The A1220EUA-T is an active product with established supply chain availability, eliminating obsolescence risk.
• Automotive Grade Qualification: The A1220EUA-T carries AEC-Q100 qualification, providing enhanced reliability documentation suitable for automotive and industrial applications.
• Improved Supply Current Efficiency: The A1220EUA-T operates at 4mA maximum supply current compared to 8mA for the A3280EUA-T, reducing power consumption in battery-powered or energy-constrained applications.
• Extended Lower Voltage Support: The A1220EUA-T supports operation down to 3V, compared to 4.2V for the A3280EUA-T, enabling use in lower-voltage system designs.
• Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring environmental and regulatory alignment.

The open drain output of the A1220EUA-T is functionally equivalent to the open collector output of the A3280EUA-T in standard pull-up resistor configurations, making this substitution transparent at the circuit level.

Frequently Asked Questions (FAQ)

Q: Can the A1220EUA-T directly replace the A3280EUA-T on existing PCBs?

A: Yes. Both parts use identical 3-SSIP through-hole packaging and pinout. No PCB modifications are required for physical replacement.

Q: What is the difference between open collector and open drain outputs?

A: Both output types function identically in standard pull-up resistor configurations. The terminology differs by semiconductor technology (bipolar vs. MOSFET), but electrical behavior is equivalent for this application.

Q: Does the lower supply voltage minimum of the A1220EUA-T (3V vs. 4.2V) affect compatibility?

A: No. The A1220EUA-T's extended lower voltage range is a superset of the A3280EUA-T's range. Systems designed for 4.2V ~ 24V operation will function identically with the A1220EUA-T.

Q: Why does the A1220EUA-T consume less supply current?

A: The A1220EUA-T incorporates more efficient internal circuitry, reducing quiescent current from 8mA to 4mA. This is a design improvement with no functional impact on sensor performance.

Q: Is the A1220EUA-T suitable for automotive applications?

A: Yes. The A1220EUA-T carries AEC-Q100 qualification, meeting automotive industry reliability and testing standards.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical ECCN and HTSUS classifications.