PCA9518DWR Equivalent & Substitute Parts

Part Overview

The PCA9518DWR is a specialized interface buffer IC manufactured by Texas Instruments in a 20-SOIC package. This component functions as an I2C buffer interface with a supply voltage range of 3V to 3.6V. The part is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring I2C buffer functionality.

Substiute Parts

PCA9518DWR

Texas InstrumentsIn Stock: 2111PCA9518DWR Datasheet

Current PartRFQ

PCA9518PWR

Texas InstrumentsIn Stock: 6115PCA9518PWR Datasheet

MFR RecommendedRFQ

CA91L862A-50IE

Renesas Electronics CorporationIn Stock: 1998CA91L862A-50IE Datasheet

MFR RecommendedRFQ

PI3HDX1204EZLEX

Diodes IncorporatedIn Stock: 2851PI3HDX1204EZLEX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9518DWR is determined by the following critical parameters: interface protocol compatibility (I2C), supply voltage range (3V to 3.6V), surface mount capability, and functional classification as a specialized interface buffer. The substitute parts listed below meet these core electrical and mechanical criteria.

PCA9518PWR qualifies as a direct substitute from the same manufacturer (Texas Instruments) with identical base product number (PCA9518), matching supply voltage (3V ~ 3.6V), and I2C interface compatibility. The primary difference is the package format: 20-TSSOP versus 20-SOIC.

CA91L862A-50IE and PI3HDX1204EZLEX are listed as manufacturer-identified substitutes but operate in different functional domains (data acquisition interface and HDMI redriver respectively) with different package formats and interface protocols. These parts are included based on the original manufacturer's substitute list but require application-level verification.

Parameter Comparison

Engineering Selection Recommendations

PCA9518PWR is the primary substitute option. It maintains identical electrical specifications (3V ~ 3.6V supply, I2C interface), originates from the same manufacturer, and carries Active product status with ROHS3 compliance. The package transition from 20-SOIC to 20-TSSOP requires PCB layout modification but presents no electrical incompatibility. This part is recommended for new designs and production transitions.

CA91L862A-50IE presents significant substitution constraints. While listed as a manufacturer-identified alternative, it operates in a different functional domain (data acquisition with PCI/Serial interfaces rather than I2C buffering), uses a 256-PBGA package requiring substantial PCB redesign, and carries RoHS non-compliance status. This part is not suitable for direct substitution in I2C buffer applications.

PI3HDX1204EZLEX is functionally incompatible with the PCA9518DWR. It is designed for HDMI redriver and level shifter applications rather than I2C buffering. The 32-TQFN package and different interface protocol make this part unsuitable for applications requiring I2C buffer functionality.

Frequently Asked Questions (FAQ)

Q: Can PCA9518PWR directly replace PCA9518DWR without circuit modification?

A: PCA9518PWR is electrically compatible and maintains identical I2C interface and supply voltage specifications. However, the package change from 20-SOIC to 20-TSSOP requires PCB footprint modification. Pin-to-pin compatibility must be verified against the specific application schematic.

Q: Why is CA91L862A-50IE listed as a substitute if it has different functionality?

A: CA91L862A-50IE appears in the original manufacturer's substitute list but operates as a data acquisition interface with PCI/Serial protocols rather than an I2C buffer. This part is not functionally equivalent and should not be selected for I2C buffer applications.

Q: What is the significance of the RoHS non-compliance status for CA91L862A-50IE?

A: RoHS non-compliance indicates the part does not meet Restriction of Hazardous Substances regulations. Applications subject to RoHS requirements cannot use this part. PCA9518PWR and PI3HDX1204EZLEX both maintain ROHS3 compliance.

Q: Is PI3HDX1204EZLEX suitable for I2C buffer replacement?

A: No. PI3HDX1204EZLEX is designed for HDMI redriver and level shifter applications. Its interface protocol, package format, and functional design differ fundamentally from the PCA9518DWR I2C buffer. This part is not a valid substitute.

Q: What packaging considerations apply when transitioning from PCA9518DWR to PCA9518PWR?

A: The transition requires PCB layout modification due to package format change (20-SOIC to 20-TSSOP). The TSSOP package has a smaller width (4.40mm versus 7.50mm) and different pin pitch. Verify pin assignments and thermal requirements for your specific application before implementation.

Q: Are there inventory considerations for substitute selection?

A: PCA9518PWR has higher inventory availability (6100 Pcs) compared to PCA9518DWR (2100 Pcs), supporting long-term supply chain stability. CA91L862A-50IE (1958 Pcs) and PI3HDX1204EZLEX (2769 Pcs) inventory levels are secondary considerations given their functional incompatibility with I2C buffer applications.