A3423LLTR-T Equivalent & Substitute Parts

Part Overview

The A3423LLTR-T is a magnetic switch sensor manufactured by Allegro MicroSystems, designed for special purpose applications using Hall Effect technology. This component features an open drain output with a sensing range of 5.5mT trip and -5.5mT release, operating across a supply voltage range of 3.8V to 24V. The part is currently classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

A3423LLTR-T

Allegro MicroSystemsIn Stock: 1952A3423LLTR-T Datasheet

Current PartRFQ

A1230LLTR-T

Allegro MicroSystemsIn Stock: 65132A1230LLTR-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the A3423LLTR-T is determined by compatibility across the following critical parameters:

Package Compatibility: Both the main part and substitute must use the 8-SOIC surface mount package to ensure PCB layout compatibility without redesign.

Technology & Output Type: Hall Effect technology with open drain output configuration must be maintained to preserve signal interface characteristics.

Operating Temperature Range: The substitute must support the full -40°C to 150°C operating temperature specification.

Supply Voltage Compatibility: The substitute supply voltage range must encompass or overlap with the original 3.8V to 24V specification to function within existing power delivery systems.

Output Current Capability: The substitute must provide sufficient open drain output current (maximum 30mA) to drive downstream logic or load circuits.

Sensing Characteristics: While polarization and sensing range may differ between the main part and substitute, these parameters must be evaluated against specific application requirements to ensure functional equivalence in the target circuit.

Parameter Comparison

Engineering Selection Recommendations

The A1230LLTR-T serves as the primary substitute for the obsolete A3423LLTR-T. Both components share identical package geometry (8-SOIC), Hall Effect technology, open drain output configuration, and full operating temperature range (-40°C to 150°C). Both maintain ROHS3 compliance and are manufactured by Allegro MicroSystems.

The A1230LLTR-T carries active product status with automotive-grade qualification (AEC-Q100), providing long-term availability and supply chain stability. This substitute is suitable for applications where the A3423LLTR-T is no longer procurable.

Design integration requires verification that the A1230LLTR-T sensing range (3mT trip, -3mT release) and maximum supply voltage (18V upper limit versus 24V for the original) align with application requirements. The substitute's bipolar switching capability (North Pole and South Pole detection) provides functional flexibility compared to the original single-pole design.

Frequently Asked Questions (FAQ)

Q: Can the A1230LLTR-T directly replace the A3423LLTR-T without PCB modifications?

A: Yes, both components use identical 8-SOIC packaging and surface mount configuration. PCB layout compatibility is maintained without redesign. However, circuit-level verification of sensing range and supply voltage compatibility is required.

Q: What are the key differences in sensing characteristics between these parts?

A: The A3423LLTR-T operates at 5.5mT trip and -5.5mT release thresholds with South Pole polarization. The A1230LLTR-T operates at 3mT trip and -3mT release thresholds with dual polarization (North and South Pole). Applications requiring the original 5.5mT threshold must evaluate whether the lower 3mT threshold of the substitute is compatible with system operation.

Q: Is the A1230LLTR-T suitable for automotive applications?

A: Yes, the A1230LLTR-T carries automotive-grade qualification with AEC-Q100 certification, making it suitable for automotive and industrial applications requiring enhanced reliability standards.

Q: What is the maximum supply voltage difference between these parts?

A: The A3423LLTR-T supports 3.8V to 24V supply range, while the A1230LLTR-T supports 3.3V to 18V. Applications operating above 18V supply voltage cannot use the A1230LLTR-T as a substitute.

Q: Are there moisture sensitivity considerations for long-term storage?

A: The A3423LLTR-T has MSL 1 (unlimited shelf life), while the A1230LLTR-T has MSL 2 (1 year shelf life). The substitute requires controlled storage conditions to maintain moisture sensitivity specifications within the 1-year window.