SY89543LMI Equivalent & Substitute Parts

Part Overview

The SY89543LMI is a precision multiplexer IC manufactured by Microchip Technology, configured as a 1 x 2:1 multiplexer in a 32-QFN (5x5) surface mount package. This component is designed for single supply operation within the 3V to 3.6V range and supports operating temperatures from -40°C to 85°C. The SY89543LMI has been discontinued at DiGi Electronics, making identification of compatible substitute parts essential for ongoing design support and production continuity.

Substiute Parts

SY89543LMI

Microchip TechnologyIn Stock: 1193SY89543LMI Datasheet

Current PartRFQ

SY89543LMG

Microchip TechnologyIn Stock: 1174SY89543LMG Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SY89543LMI are identified based on strict equivalence across the following critical parameters:

• Manufacturer: Microchip Technology (same manufacturer ensures design continuity)
• Circuit Configuration: 1 x 2:1 multiplexer with 2 independent circuits (functional equivalence)
• Voltage Supply: Single supply operation at 3V ~ 3.6V (electrical compatibility)
• Operating Temperature Range: -40°C ~ 85°C (thermal compatibility)
• Package Type: 32-VFQFN Exposed Pad (mechanical and thermal compatibility)
• Base Product Number: SY89543 (same product family)

The SY89543LMG qualifies as a direct substitute because it maintains identical specifications across all these parameters while offering improved product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The SY89543LMG is a direct functional and electrical equivalent to the SY89543LMI. Selection between these parts should be based on the following factors:

For New Designs or Production Continuation: The SY89543LMG is the recommended choice. It maintains active product status, ensuring long-term availability and supply chain stability. The SY89543LMG also provides ROHS3 compliance, meeting current environmental and regulatory requirements for electronic components.

Compliance Considerations: Both parts maintain REACH Unaffected and EAR99 export classification status. The SY89543LMG's ROHS3 compliance represents an advantage for applications subject to RoHS directives in the EU and other regulated markets.

Moisture Sensitivity: The SY89543LMI carries MSL 1 (unlimited shelf life), while the SY89543LMG carries MSL 2 (1-year shelf life). This difference requires appropriate storage and handling protocols for the substitute part but does not affect functional performance.

Electrical and Thermal Performance: Both parts are electrically and thermally identical, supporting the same voltage supply range (3V ~ 3.6V) and operating temperature range (-40°C ~ 85°C).

Frequently Asked Questions (FAQ)

Q: Can the SY89543LMG be used as a direct replacement for the SY89543LMI in existing designs?

A: Yes. The SY89543LMG is electrically and mechanically equivalent to the SY89543LMI. Both parts share identical circuit configuration (1 x 2:1 multiplexer), voltage supply specifications (3V ~ 3.6V), operating temperature range (-40°C ~ 85°C), and package type (32-VFQFN Exposed Pad). No design modifications are required.

Q: What is the difference in product status between these parts?

A: The SY89543LMI is discontinued at DiGi Electronics, limiting future availability. The SY89543LMG maintains active product status, ensuring continued supply and support from Microchip Technology and authorized distributors.

Q: Are there compliance differences between the SY89543LMI and SY89543LMG?

A: Yes. The SY89543LMG is ROHS3 compliant, while the SY89543LMI is RoHS non-compliant. For applications in regulated markets requiring RoHS compliance, the SY89543LMG is the appropriate choice. Both parts maintain REACH Unaffected status.

Q: What does the MSL rating difference mean for handling and storage?

A: The SY89543LMI carries MSL 1 (unlimited shelf life), while the SY89543LMG carries MSL 2 (1-year shelf life). MSL 2 requires that the component be stored in controlled humidity conditions and used within one year of the manufacturing date. This affects storage protocols but does not impact electrical performance or functionality.

Q: Are the packages physically identical?

A: Yes. Both parts use the 32-VFQFN Exposed Pad package (32-QFN 5x5), ensuring identical PCB footprints and thermal characteristics. No layout modifications are necessary when substituting the SY89543LMG for the SY89543LMI.

Q: Is there any performance difference in the multiplexer circuits?

A: No. Both parts provide identical 1 x 2:1 multiplexer functionality with 2 independent circuits. Electrical performance, switching characteristics, and signal integrity are equivalent.