PCA9518DBT Equivalent & Substitute Parts

Part Overview

The PCA9518DBT is a specialized interface buffer IC manufactured by Texas Instruments, designed for I2C communication applications. This component is classified as a Last Time Buy product, indicating that it is no longer in active production. The PCA9518DBT is packaged in a 20-SSOP configuration with a 5.30mm width and operates within a 3V to 3.6V supply voltage range. Due to its Last Time Buy status, identifying functionally equivalent substitute parts is essential for ongoing design support and production continuity.

Substiute Parts

PCA9518DBT

Texas InstrumentsIn Stock: 2099PCA9518DBT Datasheet

Current PartRFQ

PCA9518PWR

Texas InstrumentsIn Stock: 6115PCA9518PWR Datasheet

MFR RecommendedRFQ

MAX14502AETL+

Analog Devices Inc./Maxim IntegratedIn Stock: 21264MAX14502AETL+ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9518DBT is determined by the following critical parameters:

Primary Substitution Criteria:

• Interface protocol compatibility (I2C support)
• Supply voltage range overlap (3V ~ 3.6V operation)
• Surface mount packaging capability
• RoHS3 compliance and MSL rating

Secondary Considerations:

• Package form factor (SSOP vs. TSSOP vs. TQFN)
• Pin count and pinout compatibility
• Active product status for long-term availability

The PCA9518DBT base product number (PCA9518) identifies the functional family. Substitutes within this family maintain core I2C buffer functionality while potentially differing in package geometry and thermal characteristics.

Parameter Comparison

Engineering Selection Recommendations

PCA9518PWR (Texas Instruments): This part is the manufacturer-recommended substitute within the PCA9518 product family. It maintains identical supply voltage specifications (3V ~ 3.6V) and I2C interface compatibility. The primary difference is the package transition from 20-SSOP to 20-TSSOP, which reduces the package width from 5.30mm to 4.40mm. Both parts carry ROHS3 compliance and MSL-1 ratings. PCA9518PWR is in Active product status, ensuring long-term availability and supply chain stability. This substitute is optimal for designs where the narrower TSSOP footprint is acceptable or beneficial for PCB layout.

MAX14502AETL+ (Analog Devices Inc./Maxim Integrated): This part provides I2C and 2-Wire Serial interface support with a broader supply voltage range (1.8V ~ 3.3V), which encompasses the PCA9518DBT operating window. However, the MAX14502AETL+ uses a 40-TQFN package with significantly different pin count and physical dimensions compared to the 20-pin SSOP configuration. This substitute requires complete PCB redesign and is suitable only for new designs or major board revisions. The part maintains ROHS3 compliance and MSL-1 rating. Selection of this substitute should be based on application requirements for additional functionality or integration benefits that justify the redesign effort.

Frequently Asked Questions (FAQ)

Q: Can PCA9518PWR be used as a direct drop-in replacement for PCA9518DBT?

A: PCA9518PWR shares the same pin count (20 pins) and I2C interface protocol. The primary difference is the package form factor: TSSOP versus SSOP. If the PCB layout accommodates the narrower 4.40mm TSSOP width, pinout compatibility allows direct substitution. PCB footprint verification is required before implementation.

Q: What is the key difference between PCA9518DBT and MAX14502AETL+?

A: The MAX14502AETL+ is a 40-pin TQFN package with different pinout and functionality. While both support I2C communication, the MAX14502AETL+ is not a pin-compatible substitute. This part is suitable only for new designs where the additional pin count and expanded feature set provide application value.

Q: Why is PCA9518DBT classified as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued active production of this part number. Existing inventory is available for purchase, but no future production is planned. Customers should transition to active alternatives such as PCA9518PWR for long-term supply assurance.

Q: Are all three parts RoHS3 compliant?

A: Yes. PCA9518DBT, PCA9518PWR, and MAX14502AETL+ all carry ROHS3 Compliant certification and MSL-1 (Unlimited) moisture sensitivity ratings, meeting current environmental and reliability standards.

Q: What supply voltage range is common to all three parts?

A: The overlapping supply voltage range is 3V to 3.3V. PCA9518DBT and PCA9518PWR operate at 3V ~ 3.6V, while MAX14502AETL+ operates at 1.8V ~ 3.3V. Applications requiring operation above 3.3V must use PCA9518DBT or PCA9518PWR.

Q: Which substitute offers the best long-term availability?

A: Both PCA9518PWR and MAX14502AETL+ are in Active product status. PCA9518PWR is the preferred choice for direct substitution due to package compatibility and identical voltage specifications. MAX14502AETL+ is suitable for new designs where its expanded capabilities justify redesign effort.