PCA9545ADW Equivalent & Substitute Parts

Part Overview

The PCA9545ADW is a translating switch interface IC manufactured by Texas Instruments, designed for I2C and SMBus applications. This 20-SOIC surface mount component operates across a supply voltage range of 2.3V to 5.5V and is currently classified as Last Time Buy, indicating end-of-life status. Due to this product status, identifying functionally equivalent substitute parts is essential for design continuity and long-term component availability.

Substiute Parts

PCA9545ADW

Texas InstrumentsIn Stock: 893PCA9545ADW Datasheet

Current PartRFQ

TCA9545APWR

Texas InstrumentsIn Stock: 60229TCA9545APWR Datasheet

MFR RecommendedRFQ

MAX14502AETL+T

Analog Devices Inc./Maxim IntegratedIn Stock: 23600MAX14502AETL+T Datasheet

MFR RecommendedRFQ

PCA9545AD,118

NXP USA Inc.In Stock: 2110PCA9545AD,118 Datasheet

MFR RecommendedRFQ

Z8523316VSG

ZilogIn Stock: 2282Z8523316VSG Datasheet

MFR RecommendedRFQ

Z8523320ASG

ZilogIn Stock: 760Z8523320ASG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9545ADW is determined by the following critical parameters:

• Interface compatibility: I2C and/or SMBus support
• Package type: Surface mount configurations
• Voltage supply range: Minimum 2.3V support or compatible operating range
• RoHS3 compliance and MSL rating for manufacturing compatibility
• Active or current product status to ensure ongoing availability

The substitute parts identified fall into distinct functional categories based on these criteria. TCA9545APWR maintains the same base product architecture with enhanced voltage range. PCA9545AD,118 provides direct form-factor compatibility in the same 20-SOIC package. MAX14502AETL+T and Zilog parts (Z8523316VSG, Z8523320ASG) represent alternative interface solutions with different package configurations and voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

TCA9545APWR is the primary substitute for direct functional replacement. It shares the same base product number (TCA9545) and maintains I2C/SMBus interface compatibility. The extended voltage range (1.65V ~ 5.5V) provides broader application flexibility. Package transition from 20-SOIC to 20-TSSOP requires PCB layout modification but maintains pin-count compatibility. Active product status ensures long-term availability.

PCA9545AD,118 offers the most direct substitution path, maintaining identical 20-SOIC packaging and form factor. Manufactured by NXP USA Inc., this part provides I2C interface support with dual voltage range operation (2.3V ~ 3.6V and 4.5V ~ 5.5V). Active product status and ROHS3 compliance support manufacturing continuity.

MAX14502AETL+T represents an alternative interface solution from Analog Devices Inc./Maxim Integrated. The 40-TQFN package and restricted voltage range (1.8V ~ 3.3V) limit direct substitution applicability but provide USB interface capability for specific applications. MSL rating of 1 ensures manufacturing compatibility.

Z8523316VSG and Z8523320ASG (Zilog EMSCC™ series) are specialized interface components with higher MSL ratings (3, 168 Hours) and restricted voltage operation (4.5V ~ 5.5V only). These parts are suitable only for applications operating within this voltage window and with extended component storage protocols.

Frequently Asked Questions (FAQ)

Q: Can TCA9545APWR directly replace PCA9545ADW without PCB modifications?

A: TCA9545APWR maintains functional I2C/SMBus compatibility and pin count but transitions from 20-SOIC to 20-TSSOP packaging. PCB footprint redesign is required. Pin assignment verification against datasheets is mandatory before implementation.

Q: What is the primary reason to substitute PCA9545ADW?

A: PCA9545ADW carries Last Time Buy status, indicating end-of-life classification. Proactive substitution ensures design continuity and prevents supply chain disruption.

Q: Is PCA9545AD,118 a drop-in replacement?

A: PCA9545AD,118 maintains the same 20-SOIC package and form factor as PCA9545ADW, enabling direct PCB compatibility. Voltage range and I2C interface specifications require verification against application requirements.

Q: Why do Zilog parts (Z8523316VSG, Z8523320ASG) have higher MSL ratings?

A: Zilog interface components carry MSL 3 (168 Hours) ratings, indicating greater moisture sensitivity during storage and handling. Extended component storage protocols and controlled humidity environments are required during manufacturing.

Q: Can MAX14502AETL+T replace PCA9545ADW in all applications?

A: MAX14502AETL+T operates within a restricted voltage range (1.8V ~ 3.3V) compared to PCA9545ADW (2.3V ~ 5.5V). Substitution is viable only for applications operating within the 1.8V ~ 3.3V window. Package transition from 20-SOIC to 40-TQFN requires significant PCB redesign.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all identified substitute parts maintain ROHS3 compliance, ensuring regulatory alignment with current manufacturing standards.

Q: What voltage range compatibility should I prioritize when selecting a substitute?

A: Verify that the substitute part's voltage supply range encompasses the application's operating voltage. PCA9545AD,118 and TCA9545APWR provide the broadest compatibility with the original PCA9545ADW specification range.