PCA9546ADW Equivalent & Substitute Parts

Part Overview

The PCA9546ADW is a translating switch interface IC manufactured by Texas Instruments, designed for I2C and SMBus applications. This 16-SOIC surface mount component operates across a supply voltage range of 2.3V to 5.5V and is classified as a specialized interface component. The device is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is essential for design continuity, long-term supply chain planning, and new project implementations where active alternatives are preferred.

Substiute Parts

PCA9546ADW

Texas InstrumentsIn Stock: 2043PCA9546ADW Datasheet

Current PartRFQ

TCA9546ADR

Texas InstrumentsIn Stock: 11711TCA9546ADR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9546ADW is determined by the following critical parameters:

Primary Substitution Criteria:

• Package compatibility: 16-SOIC form factor (surface mount)
• Interface protocol support: I2C and/or SMBus compatibility
• Supply voltage range: Minimum 2.3V operation capability
• Functional classification: Translating switch or bus switch interface

Secondary Compatibility Factors:

• RoHS3 compliance status
• Moisture sensitivity level (MSL 1 or equivalent)
• Mounting type (surface mount)
• Manufacturer reliability and availability

The TCA9546ADR qualifies as a substitute based on shared 16-SOIC packaging, surface mount configuration, I2C/SMBus protocol support, and equivalent compliance certifications. While the TCA9546ADR operates at a lower minimum supply voltage (1.65V versus 2.3V), it maintains full compatibility within the overlapping voltage range of 2.3V to 5.5V.

Parameter Comparison

Engineering Selection Recommendations

For PCA9546ADW Replacement:

The TCA9546ADR is the qualified substitute for the PCA9546ADW based on functional equivalence and compliance alignment. Both components are manufactured by Texas Instruments, maintain ROHS3 compliance, and support identical I2C and SMBus protocols. The TCA9546ADR holds Active product status, ensuring continued availability and supply chain stability compared to the Last Time Buy status of the PCA9546ADW.

Supply Voltage Consideration:

The TCA9546ADR extends the lower supply voltage limit to 1.65V, providing additional operational flexibility. Within the shared operating range of 2.3V to 5.5V, both components are electrically equivalent. Designs currently operating the PCA9546ADW at 2.3V or higher will function identically with the TCA9546ADR.

Package Geometry Note:

Both components use 16-SOIC packaging but with different pitch specifications (7.50mm versus 3.90mm width). PCB layout and footprint verification is required before substitution to ensure mechanical compatibility with existing board designs.

Frequently Asked Questions (FAQ)

Q: Can the TCA9546ADR directly replace the PCA9546ADW in existing designs?

A: The TCA9546ADR is functionally equivalent within the overlapping supply voltage range (2.3V to 5.5V) and shares identical I2C/SMBus protocol support. However, the 16-SOIC package pitch differs (7.50mm versus 3.90mm), requiring PCB footprint verification before implementation.

Q: Why is the PCA9546ADW listed as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued production planning for this component. The TCA9546ADR, with Active status, represents the current production alternative for new designs and ongoing supply requirements.

Q: Are there compliance differences between these parts?

A: Both components maintain identical ROHS3 compliance, MSL 1 rating, and REACH unaffected status. No compliance barriers exist for substitution.

Q: What is the minimum supply voltage requirement for substitution?

A: If your design operates at 2.3V or higher, the TCA9546ADR is fully compatible. The TCA9546ADR's extended lower limit (1.65V) does not affect designs already constrained to 2.3V minimum operation.

Q: How do I verify PCB compatibility before substitution?

A: Obtain the detailed package drawings for both the PCA9546ADW (7.50mm SOIC width) and TCA9546ADR (3.90mm SOIC width). Compare these dimensions against your PCB footprint specifications to confirm mechanical fit.