PCA9518PW,112 Equivalent & Substitute Parts

Part Overview

The PCA9518PW,112 is a specialized interface buffer IC manufactured by NXP USA Inc., designed for I2C and SMBus applications. This 20-TSSOP surface mount component operates within a 3V to 3.6V supply voltage range and is classified as obsolete. Due to its obsolete status and limited availability from the original manufacturer, identifying equivalent and substitute parts is essential for system redesign, production continuity, and long-term supply chain management.

Substiute Parts

PCA9518PW,112

NXP USA Inc.In Stock: 1144PCA9518PW,112 Datasheet

Current PartRFQ

PCA9518PW

Texas InstrumentsIn Stock: 3670PCA9518PW Datasheet

DirectRFQ

AD9985ABSTZ-110

Analog Devices Inc.In Stock: 20598AD9985ABSTZ-110 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the PCA9518PW,112 is determined by the following critical parameters:

Primary Substitution Criteria:

• Interface protocol compatibility (I2C, SMBus)
• Supply voltage range (3V ~ 3.6V or overlapping range)
• Package type and pin count (20-TSSOP preferred for direct PCB compatibility)
• Application classification (Buffer/Interface)
• RoHS and compliance certifications (ROHS3 Compliant)

Identified Substitute Categories:

1. Direct Equivalent (Same Package, Same Interface): PCA9518PW from Texas Instruments maintains identical electrical specifications, package format, and interface protocol, making it a direct pin-compatible replacement.

2. Functional Alternative (Different Package, Different Interface): AD9985ABSTZ-110 from Analog Devices Inc. operates within compatible voltage ranges but features a different package type (80-LQFP) and serves video interface applications rather than I2C/SMBus buffering. This substitute requires PCB redesign and is not recommended for direct replacement without circuit modification.

Parameter Comparison

Engineering Selection Recommendations

Recommended Primary Substitute: PCA9518PW (Texas Instruments)

The Texas Instruments PCA9518PW is the optimal substitute for the obsolete NXP PCA9518PW,112. Both parts share identical electrical specifications, package format, and interface protocols. The Texas Instruments variant maintains ROHS3 compliance, MSL Level 1 rating, and is currently available in Last Time Buy status with 3600 units in stock. This part requires no PCB modifications and provides direct functional replacement.

Alternative Substitute: AD9985ABSTZ-110 (Analog Devices Inc.)

The AD9985ABSTZ-110 is not recommended as a direct substitute due to fundamental differences in application classification (video interface versus I2C/SMBus buffer), package type (80-LQFP versus 20-TSSOP), and interface protocol. Implementation of this part would require complete circuit redesign and is suitable only for applications where video interface functionality is required and PCB layout can be modified.

Frequently Asked Questions (FAQ)

Q: Can the PCA9518PW from Texas Instruments be used as a direct replacement for the NXP PCA9518PW,112?

A: Yes. Both parts are electrically identical, operate at 3V to 3.6V supply voltage, support I2C and SMBus protocols, and use the same 20-TSSOP package. No circuit modifications are required for substitution.

Q: Why is the AD9985ABSTZ-110 listed as a substitute if it has a different package and interface?

A: The AD9985ABSTZ-110 is listed based on the original part data provided. However, it is not a functional equivalent due to its 80-LQFP package, video interface specialization, and serial protocol focus. Direct substitution is not possible without complete PCB redesign.

Q: What is the significance of the MSL rating difference between the main part and substitutes?

A: The PCA9518PW,112 and Texas Instruments PCA9518PW both carry MSL Level 1 (Unlimited), indicating no moisture sensitivity constraints during storage and handling. The AD9985ABSTZ-110 carries MSL Level 3 (168 Hours), requiring controlled storage conditions and limiting shelf life. This difference is relevant only if the AD9985ABSTZ-110 is considered for alternative applications.

Q: Are all listed parts ROHS3 compliant?

A: Yes. The PCA9518PW,112, PCA9518PW (Texas Instruments), and AD9985ABSTZ-110 are all ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing and distribution.

Q: What should be considered when transitioning from the obsolete NXP part to the Texas Instruments equivalent?

A: Verify that the Texas Instruments PCA9518PW is available in the required packaging format (Tube, as specified). Confirm that the Last Time Buy status does not conflict with long-term production requirements. Conduct functional testing to validate performance in the target application, though electrical compatibility is assured.