PCA9518DW Equivalent & Substitute Parts

Part Overview

The PCA9518DW is a specialized interface buffer IC manufactured by Texas Instruments in a 20-SOIC surface mount package. This component functions as an I2C buffer interface with a supply voltage range of 3V to 3.6V. The PCA9518DW is currently in Last Time Buy status, indicating that production has been discontinued and existing inventory represents the final availability from the manufacturer. Due to this product status, identifying functionally equivalent substitute parts is essential for ongoing design support and procurement planning.

Substiute Parts

PCA9518DW

Texas InstrumentsIn Stock: 1384PCA9518DW Datasheet

Current PartRFQ

PCA9518PWR

Texas InstrumentsIn Stock: 6115PCA9518PWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9518DW is determined by the following critical parameters:

• Base Product Number: Both the main part and substitute must share the PCA9518 base product number, ensuring identical die and functional performance
• Interface Type: I2C compatibility is mandatory for buffer interface operation
• Voltage Supply Range: 3V to 3.6V supply voltage must be maintained
• Mounting Type: Surface mount technology is required for PCB assembly compatibility
• RoHS and Compliance Status: ROHS3 compliance and REACH unaffected status must be preserved

The PCA9518PWR qualifies as a manufacturer-recommended substitute because it maintains the same base product number, interface specification, voltage range, and compliance certifications. The primary difference is the package format: the substitute uses 20-TSSOP packaging instead of 20-SOIC packaging.

Parameter Comparison

Engineering Selection Recommendations

The PCA9518PWR is the manufacturer-recommended substitute for the PCA9518DW. Both parts share identical functional specifications, electrical characteristics, and compliance certifications. The PCA9518PWR maintains Active product status, ensuring continued availability and long-term supply security compared to the Last Time Buy status of the PCA9518DW.

Selection between these parts depends on PCB layout and assembly requirements. The PCA9518DW uses 20-SOIC packaging with a 7.50mm width, while the PCA9518PWR uses 20-TSSOP packaging with a 4.40mm width. The TSSOP package offers reduced footprint dimensions, which may be advantageous for space-constrained designs. Both packages are surface mount compatible and maintain identical pin functionality.

The PCA9518PWR is supplied in Tape & Reel format, which is standard for high-volume production environments. The PCA9518DW is supplied in Tube packaging. Both packaging formats are suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the PCA9518PWR directly replace the PCA9518DW on an existing PCB?

A: Direct PCB replacement is not possible without layout modification. The PCA9518DW uses 20-SOIC packaging while the PCA9518PWR uses 20-TSSOP packaging. These packages have different footprints and pin spacing. PCB redesign is required to accommodate the substitute part.

Q: Are the electrical specifications identical between PCA9518DW and PCA9518PWR?

A: Yes. Both parts share the same base product number (PCA9518), supply voltage range (3V to 3.6V), I2C interface compatibility, and functional performance. The PCA9518PWR additionally supports SMBus protocol.

Q: What is the significance of the Last Time Buy status for the PCA9518DW?

A: Last Time Buy status indicates that the manufacturer has discontinued production. Existing inventory represents the final availability. After current stock is depleted, the PCA9518DW will no longer be available from the manufacturer. The PCA9518PWR, with Active status, provides long-term supply continuity.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the PCA9518DW and PCA9518PWR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging is used for lower-volume orders and manual handling. Tape & Reel (TR) packaging is designed for automated pick-and-place assembly equipment used in production environments. Both formats contain the same components; the difference is in handling and dispensing method.