A1146EUA-T Equivalent & Substitute Parts

Part Overview

The A1146EUA-T is a unipolar magnetic switch utilizing Hall Effect technology, manufactured by Allegro MicroSystems. This component functions as a digital switch with current source output, designed for automotive-grade applications requiring magnetic field detection. The A1146EUA-T is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity. The substitute part A1156LUA-T provides functional equivalence while maintaining active product status and extended operational temperature range.

Substiute Parts

A1146EUA-T

Allegro MicroSystemsIn Stock: 745A1146EUA-T Datasheet

Current PartRFQ

A1156LUA-T

Allegro MicroSystemsIn Stock: 44472A1156LUA-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the A1146EUA-T with the A1156LUA-T is valid based on the following criteria:

Matching Parameters (Substitution Basis):

• Function: Both are unipolar switches
• Technology: Both utilize Hall Effect sensing
• Polarization: Both detect South Pole magnetic fields
• Sensing Range: Identical at 6mT trip, 1mT release
• Current Supply (Max): Both rated at 17mA
• Output Type: Both provide current source output
• Mounting Type: Both are through-hole components
• Package: Both use 3-SSIP package configuration
• RoHS Status: Both ROHS3 compliant

Differing Parameters (Acceptable Variations):

• Voltage Supply: A1146EUA-T operates 4.6V ~ 24V; A1156LUA-T operates 3V ~ 24V (wider lower voltage range)
• Operating Temperature: A1146EUA-T rated -40°C ~ 85°C; A1156LUA-T rated -40°C ~ 150°C (extended upper temperature range)
• Product Status: A1146EUA-T is obsolete; A1156LUA-T is active

The A1156LUA-T maintains all critical electrical and mechanical parameters while providing improved temperature performance and active product availability.

Parameter Comparison

Engineering Selection Recommendations

The A1156LUA-T is the direct substitute for the obsolete A1146EUA-T. Selection is based on:

Product Status: The A1146EUA-T is obsolete, creating supply chain risk. The A1156LUA-T maintains active product status with confirmed inventory availability (44,400 pcs).

Electrical Compatibility: Both components share identical sensing parameters, supply current ratings, and output characteristics. The A1156LUA-T provides a wider supply voltage range (3V minimum versus 4.6V), offering improved flexibility for low-voltage applications.

Thermal Performance: The A1156LUA-T extends the maximum operating temperature to 150°C compared to 85°C for the A1146EUA-T, supporting applications requiring enhanced thermal margin.

Compliance: Both components maintain ROHS3 compliance and automotive-grade construction. The A1146EUA-T carries AEC-Q100 qualification; equivalent qualification status for the A1156LUA-T should be confirmed during design validation.

Mechanical Compatibility: Identical through-hole mounting and 3-SSIP package ensure direct PCB layout compatibility without redesign.

Frequently Asked Questions (FAQ)

Q: Can the A1156LUA-T directly replace the A1146EUA-T without PCB modifications?

A: Yes. Both components use identical through-hole mounting and 3-SSIP package configuration. No PCB layout changes are required for mechanical or electrical integration.

Q: What is the significance of the extended temperature range in the A1156LUA-T?

A: The A1156LUA-T operates to 150°C maximum, compared to 85°C for the A1146EUA-T. This provides additional thermal margin for applications operating in elevated ambient conditions or with localized heat sources. Applications limited to 85°C operation are unaffected by this difference.

Q: Are the magnetic sensing characteristics identical between these parts?

A: Yes. Both components use Hall Effect technology with South Pole polarization and identical trip/release thresholds (6mT trip, 1mT release). Magnetic field detection behavior is functionally equivalent.

Q: Does the wider supply voltage range of the A1156LUA-T affect existing designs?

A: No. The A1156LUA-T accepts the full 4.6V ~ 24V range of the A1146EUA-T, plus extends to 3V minimum. Existing power supply designs require no modification.

Q: What is the current source output specification for these components?

A: Both components provide current source output with maximum supply current of 17mA. Output current characteristics are identical between the two parts.

Q: Is the A1156LUA-T available in the same packaging as the A1146EUA-T?

A: Yes. Both use 3-SSIP package configuration. The A1156LUA-T is available in bulk packaging, supporting production volume requirements.