PCA9544ADW Equivalent & Substitute Parts

Part Overview

The PCA9544ADW is a translating switch interface IC manufactured by Texas Instruments, designed for I2C and SMBus applications. This 20-SOIC surface mount device operates across a supply voltage range of 2.3V to 5.5V and is classified as a Last Time Buy product. Due to its discontinued status, identifying functionally equivalent substitute components is essential for design continuity and procurement planning. The part maintains ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substiute Parts

PCA9544ADW

Texas InstrumentsIn Stock: 65805PCA9544ADW Datasheet

Current PartRFQ

TCA9544APWR

Texas InstrumentsIn Stock: 700108TCA9544APWR Datasheet

MFR RecommendedRFQ

CA91L862A-50IEV

Renesas Electronics CorporationIn Stock: 2188CA91L862A-50IEV Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9544ADW is determined by the following critical parameters:

Primary Substitution Criteria:

• Interface protocol compatibility (I2C/SMBus support)
• Supply voltage range overlap (minimum 2.3V to 5.5V capability)
• Package form factor and mounting type (surface mount)
• Functional classification (translating switch or multiplexer interface)
• Regulatory compliance (ROHS3, REACH Unaffected)

Identified Substitutes:

1. TCA9544APWR – Texas Instruments multiplexer variant with 1 x 1:4 circuit configuration, 20-TSSOP package, extended supply range (1.65V ~ 5.5V), active product status
2. CA91L862A-50IEV – Renesas Electronics data acquisition interface, 256-PBGA package, fixed 3.3V supply, active product status

Parameter Comparison

Engineering Selection Recommendations

TCA9544APWR is the primary substitute candidate. Both components are manufactured by Texas Instruments and share the same base product number (TCA9544). The TCA9544APWR offers active product status, ensuring long-term availability and supply chain stability. The supply voltage range (1.65V ~ 5.5V) encompasses the original specification (2.3V ~ 5.5V). Package transition from 20-SOIC to 20-TSSOP requires PCB layout modification but maintains equivalent pin count and surface mount compatibility. Both components maintain ROHS3 compliance and unlimited MSL rating.

CA91L862A-50IEV presents significant substitution constraints. The 256-PBGA package represents a substantial form factor change from the 20-pin SOIC/TSSOP packages. The fixed 3.3V supply voltage does not accommodate the original 2.3V minimum specification. The MSL rating of 3 (168 hours) introduces moisture sensitivity considerations absent in the primary part. This component is suitable only for applications where package footprint and voltage requirements align with the 3.3V fixed supply specification.

Frequently Asked Questions (FAQ)

Q: Can TCA9544APWR directly replace PCA9544ADW without design changes?

A: Pin-to-pin compatibility exists between the 20-SOIC and 20-TSSOP packages, but PCB layout modifications are required. The TSSOP package has different lead pitch and body dimensions. Electrical functionality is equivalent within the overlapping supply voltage range.

Q: What is the voltage compatibility between PCA9544ADW and TCA9544APWR?

A: The PCA9544ADW operates from 2.3V to 5.5V. The TCA9544APWR operates from 1.65V to 5.5V. The TCA9544APWR is compatible with all applications using the original part within the 2.3V to 5.5V range. Applications requiring operation below 2.3V cannot use the original part specification.

Q: Is CA91L862A-50IEV a viable substitute?

A: CA91L862A-50IEV is not recommended as a direct substitute due to package incompatibility (256-PBGA versus 20-pin packages), fixed 3.3V supply voltage, and different functional classification (data acquisition interface versus translating switch). Substitution is only applicable in designs specifically requiring 256-PBGA packaging and 3.3V operation.

Q: What are the MSL implications for long-term storage?

A: PCA9544ADW and TCA9544APWR both carry MSL 1 (unlimited) ratings, permitting indefinite storage without moisture bake-out procedures. CA91L862A-50IEV carries MSL 3 (168 hours), requiring moisture control during storage and handling.

Q: Are all substitute parts ROHS3 and REACH compliant?

A: Yes. PCA9544ADW, TCA9544APWR, and CA91L862A-50IEV are all ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component procurement.