A3240LUA-T Equivalent & Substitute Parts

Part Overview

The A3240LUA-T is a unipolar magnetic switch utilizing Hall Effect technology, designed for digital switching applications with open collector output. This component operates across a wide supply voltage range (4.2V to 24V) and is housed in a 3-SIP through-hole package. The device is currently classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

A3240LUA-T

Allegro MicroSystemsIn Stock: 2304A3240LUA-T Datasheet

Current PartRFQ

A1120LUA-T

Allegro MicroSystemsIn Stock: 25426A1120LUA-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the A3240LUA-T is determined by strict alignment of the following critical parameters:

• Technology & Function: Hall Effect unipolar switch operation
• Polarization: South pole magnetic field detection
• Package & Mounting: 3-SSIP through-hole configuration
• Supply Voltage Range: Compatibility with 4.2V minimum supply requirement
• Output Configuration: Open collector or open drain output capability
• Temperature Range: -40°C to 150°C operating window
• Output Current: 25mA maximum output current capacity
• Compliance: ROHS3 and REACH compliance status

The A1120LUA-T qualifies as a direct substitute based on these parameters. Both devices share identical polarization, package type, mounting method, temperature range, and output current specifications. The A1120LUA-T maintains the required functional characteristics while offering improved product availability as an active component.

Parameter Comparison

Engineering Selection Recommendations

The A1120LUA-T is the qualified substitute for the obsolete A3240LUA-T. Selection of this substitute is supported by the following factors:

• Product Availability: The A1120LUA-T maintains active product status with substantial inventory availability, ensuring supply chain continuity.
• Compliance Alignment: Both components maintain ROHS3 and REACH compliance, meeting regulatory requirements for new designs and legacy system support.
• Automotive Qualification: The A1120LUA-T carries AEC-Q100 qualification, providing additional reliability assurance for applications requiring automotive-grade components.
• Functional Compatibility: Identical package, mounting type, temperature range, and output current specifications ensure direct pin-compatible replacement.
• Supply Voltage Consideration: The A1120LUA-T extends the minimum supply voltage range to 3V, providing broader application flexibility compared to the 4.2V minimum of the A3240LUA-T.

Frequently Asked Questions (FAQ)

Q: Can the A1120LUA-T directly replace the A3240LUA-T in existing designs?

A: Yes. Both components share identical 3-SSIP package configuration, through-hole mounting, -40°C to 150°C operating temperature range, and 25mA maximum output current. Pin compatibility is maintained for direct substitution.

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

A: Both output types function as switching elements that connect to ground when activated. Open collector and open drain are functionally equivalent in circuit operation, with the distinction being the internal transistor technology used. For the purposes of this substitution, both output types are compatible.

Q: Does the lower release threshold (0.5mT vs 5mT) on the A1120LUA-T affect compatibility?

A: The A1120LUA-T maintains the same 5mT trip threshold as the A3240LUA-T. The lower release threshold (0.5mT vs 5mT) represents improved hysteresis characteristics and does not prevent substitution. Applications designed for the A3240LUA-T will function with the A1120LUA-T.

Q: Is the reduced supply current (4mA vs 6mA) on the A1120LUA-T a concern?

A: No. Lower supply current consumption is a beneficial characteristic that does not affect substitution compatibility. The A1120LUA-T requires less power while maintaining identical output current capability.

Q: What is the significance of AEC-Q100 qualification on the A1120LUA-T?

A: AEC-Q100 qualification indicates the component meets automotive industry reliability and quality standards. This certification is beneficial for applications requiring automotive-grade components but does not restrict use in non-automotive applications.

Q: Are there any applications where the A1120LUA-T cannot substitute for the A3240LUA-T?

A: The A1120LUA-T is suitable for all applications previously using the A3240LUA-T. The extended minimum supply voltage range (3V vs 4.2V) and improved release threshold characteristics make it a superior substitute across all operating conditions.