LE9531CETCT Equivalent & Substitute Parts

Part Overview

The LE9531CETCT is a Telecom IC Subscriber Line Interface Concept (SLIC) manufactured by Microchip Technology, designed for telecommunications interface applications. This component operates at 3.3V supply voltage with a 48-pin QFN package configuration and parallel interface architecture. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

LE9531CETCT

Microchip TechnologyIn Stock: 937LE9531CETCT Datasheet

Current PartRFQ

LE9541CUQCT

Microchip TechnologyIn Stock: 44142LE9541CUQCT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LE9531CETCT is determined by the following critical parameters:

• Functional Equivalence: Both parts must perform the Subscriber Line Interface Concept (SLIC) function for telecommunications applications
• Supply Voltage Compatibility: Substitute parts must operate at 3.3V supply voltage
• Number of Circuits: Single-circuit configuration requirement
• Manufacturer Continuity: Microchip Technology maintains the SLIC product line with active alternatives
• Compliance Standards: RoHS3 compliance and MSL rating must be maintained for manufacturing and storage requirements

The LE9541CUQCT is identified as the manufacturer-recommended substitute. While this part maintains functional SLIC capability and 3.3V operation, it introduces interface architecture changes (serial versus parallel) and package configuration differences (40QFN versus 48QFN) that require design evaluation.

Parameter Comparison

Engineering Selection Recommendations

The LE9541CUQCT is the active manufacturer-recommended substitute for the obsolete LE9531CETCT. Both components maintain ROHS3 compliance and identical MSL ratings, ensuring compatibility with current manufacturing and storage protocols.

Selection of the LE9541CUQCT requires design-level evaluation due to two material differences:

• Interface Architecture Change: The shift from parallel to serial interface necessitates firmware and PCB-level modifications to communication protocols
• Package Configuration Change: Reduction from 48QFN to 40QFN requires PCB layout redesign and pin mapping verification

Both components share identical supply voltage (3.3V), export classification (EAR99), and tariff coding (8542.39.0001), supporting regulatory and procurement continuity.

Frequently Asked Questions (FAQ)

Q: Can the LE9541CUQCT be used as a direct pin-for-pin replacement for the LE9531CETCT?

A: No. The LE9541CUQCT uses a 40-pin QFN package compared to the 48-pin QFN of the LE9531CETCT, and the interface architecture differs (serial versus parallel). PCB layout and firmware modifications are required.

Q: What are the key differences between these SLIC components?

A: The primary differences are package pin count (40 versus 48), interface protocol (serial versus parallel), and product status (active versus obsolete). Both maintain 3.3V supply voltage operation and ROHS3 compliance.

Q: Are there any compliance or regulatory concerns with substitution?

A: Both components share identical RoHS status (ROHS3 Compliant), MSL rating (3, 168 Hours), ECCN classification (EAR99), and HTSUS code (8542.39.0001). No compliance barriers exist for substitution.

Q: What is the inventory status of these parts?

A: The LE9531CETCT has 836 pieces in stock as new original inventory. The LE9541CUQCT has 44,100 pieces available in tape and reel packaging as new original inventory.

Q: Does the LE9541CUQCT meet the same moisture sensitivity requirements?

A: Yes. Both components carry MSL rating 3 with 168-hour exposure limits, requiring identical handling, storage, and reflow protocols.