LE9531DMQCT Equivalent & Substitute Parts

Part Overview

The LE9531DMQCT is a Telecom IC Subscriber Line Interface Concept (SLIC) manufactured by Microchip Technology, designed for telecommunications interface applications. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The part operates at 3.3V supply voltage with a maximum supply current of 40mA and is housed in a 28-pin QFN package.

Substiute Parts

LE9531DMQCT

Microchip TechnologyIn Stock: 17610LE9531DMQCT Datasheet

Current PartRFQ

LE9541DUQCT

Microchip TechnologyIn Stock: 17438LE9541DUQCT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LE9531DMQCT is determined by the following critical parameters:

• Functional Equivalence: Both parts must implement Subscriber Line Interface Concept (SLIC) functionality for telecommunications applications
• Supply Voltage Compatibility: Substitute parts must operate at 3.3V supply voltage
• Circuit Count: Single-circuit configuration requirement
• Manufacturer Continuity: Microchip Technology as the original manufacturer ensures design compatibility and technical support
• Compliance Standards: RoHS3 compliance and identical MSL rating (3, 168 Hours) required for manufacturing and storage compatibility

The LE9541DUQCT is identified as the manufacturer-recommended substitute. While this part introduces differences in interface type (Serial vs. Parallel) and package configuration (40QFN vs. 28QFN), it maintains functional equivalence as a SLIC component from the same manufacturer with identical supply voltage and circuit count specifications.

Parameter Comparison

Engineering Selection Recommendations

The LE9541DUQCT is the manufacturer-recommended substitute for the obsolete LE9531DMQCT. Both components maintain identical supply voltage (3.3V), circuit count (1), and functional classification as SLIC devices. Both parts carry ROHS3 compliance and identical MSL ratings, ensuring compatibility with current manufacturing and storage requirements.

The transition from the LE9531DMQCT to the LE9541DUQCT involves interface architecture changes (Parallel to Serial) and package reconfiguration (28QFN to 40QFN). These differences require circuit board redesign and firmware adaptation. The LE9541DUQCT's active product status ensures ongoing manufacturer support, technical documentation, and supply chain availability compared to the obsolete LE9531DMQCT.

Frequently Asked Questions (FAQ)

Q: Can the LE9541DUQCT be used as a direct pin-for-pin replacement for the LE9531DMQCT?

A: No. The LE9541DUQCT uses a 40-pin QFN package compared to the 28-pin QFN of the LE9531DMQCT, and the interface architecture differs (Serial vs. Parallel). Circuit board redesign is required.

Q: What are the primary differences between these two SLIC components?

A: The main differences are package size (40QFN vs. 28QFN), interface protocol (Serial vs. Parallel), and product status (Active vs. Obsolete). Both maintain 3.3V supply voltage and single-circuit configuration.

Q: Are both parts compliant with current regulatory requirements?

A: Yes. Both the LE9531DMQCT and LE9541DUQCT are ROHS3 compliant with identical MSL ratings (3, 168 Hours), meeting current manufacturing and environmental standards.

Q: Why is the LE9541DUQCT recommended as a substitute despite interface differences?

A: The LE9541DUQCT is the manufacturer-recommended alternative from Microchip Technology that maintains core SLIC functionality and supply voltage specifications. Its active product status ensures continued availability and technical support.

Q: What supply current should be expected from the LE9541DUQCT?

A: The LE9541DUQCT supply current specification is not provided in the manufacturer data. Design validation is required to confirm power consumption characteristics for your specific application.