A1145EUA-T Equivalent & Substitute Parts

Part Overview

The A1145EUA-T is a unipolar magnetic switch manufactured by Allegro MicroSystems, utilizing Hall Effect technology for digital switching applications. This component operates as a current source with a sensing range of 6mT trip and 1mT release, designed for automotive-grade applications with AEC-Q100 qualification.

The A1145EUA-T is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this magnetic sensor.

Substiute Parts

A1145EUA-T

Allegro MicroSystemsIn Stock: 832A1145EUA-T Datasheet

Current PartRFQ

A1155LUA-T

Allegro MicroSystemsIn Stock: 1037A1155LUA-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the A1145EUA-T is determined by the following critical parameters that must remain consistent:

• Function & Technology: Unipolar Switch with Hall Effect technology
• Polarization: South Pole sensing
• Sensing Range: 6mT Trip, 1mT Release
• Output Type: Current Source
• Mounting Type: Through Hole
• Package / Case: 3-SSIP
• Supply Voltage Range: Compatible with 4.6V ~ 24V operation
• Maximum Supply Current: 17mA
• Compliance: ROHS3 Compliant, AEC-Q100 qualified for automotive applications

The A1155LUA-T qualifies as a manufacturer-recommended substitute based on matching all critical electrical and mechanical parameters while offering extended operating temperature range and active product status.

Parameter Comparison

Engineering Selection Recommendations

The A1155LUA-T is the manufacturer-recommended substitute for the obsolete A1145EUA-T. Both components maintain identical electrical specifications for Hall Effect unipolar switching, sensing range, supply current, and output characteristics. The A1155LUA-T is currently in active production status, ensuring supply chain continuity.

The A1155LUA-T provides an extended operating temperature range (-40°C ~ 150°C versus -40°C ~ 85°C), which offers broader thermal capability for demanding automotive applications. The minimum supply voltage specification is marginally lower (3V versus 4.6V), providing enhanced low-voltage operation compatibility.

Both parts maintain AEC-Q100 automotive qualification and ROHS3 compliance, supporting equivalent reliability and regulatory requirements. The identical 3-SSIP package and through-hole mounting type ensure direct mechanical and electrical compatibility without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can the A1155LUA-T directly replace the A1145EUA-T without circuit modification?

A: Yes. The A1155LUA-T maintains identical electrical parameters for Hall Effect sensing, output type, supply current, and package configuration. Direct substitution is supported without circuit redesign.

Q: What is the significance of the extended operating temperature range in the A1155LUA-T?

A: The A1155LUA-T operates across -40°C ~ 150°C, compared to the A1145EUA-T range of -40°C ~ 85°C. This extended range provides thermal margin for high-temperature automotive environments and industrial applications without performance degradation.

Q: Are both parts qualified for automotive applications?

A: Yes. Both the A1145EUA-T and A1155LUA-T carry AEC-Q100 automotive qualification and ROHS3 compliance, meeting equivalent reliability and regulatory standards for automotive-grade magnetic sensor applications.

Q: Does the lower minimum supply voltage of the A1155LUA-T (3V vs 4.6V) affect compatibility?

A: No. The lower minimum voltage specification of the A1155LUA-T expands operational capability at lower supply voltages. Systems designed for the A1145EUA-T operating range (4.6V ~ 24V) remain fully compatible with the A1155LUA-T.

Q: Is the 3-SSIP package identical between both parts?

A: Yes. Both components use the 3-SSIP package with through-hole mounting. Physical and electrical pin configurations are identical, supporting direct PCB compatibility without layout modifications.