PCA9518DBR Equivalent & Substitute Parts

Part Overview

The PCA9518DBR is a specialized interface buffer IC manufactured by Texas Instruments, designed for I2C applications. It is packaged in a 20-SSOP form factor with a width of 5.30mm and operates at 3V to 3.6V supply voltage. The device is currently in Last Time Buy status, indicating end-of-life production. Finding equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring I2C buffer functionality.

Substiute Parts

PCA9518DBR

Texas InstrumentsIn Stock: 4732PCA9518DBR Datasheet

Current PartRFQ

PCA9518PWR

Texas InstrumentsIn Stock: 6115PCA9518PWR Datasheet

MFR RecommendedRFQ

PI3HDX1204EZLEX

Diodes IncorporatedIn Stock: 2851PI3HDX1204EZLEX Datasheet

MFR RecommendedRFQ

TW3801-TC1-CR

Renesas Electronics CorporationIn Stock: 2106TW3801-TC1-CR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9518DBR is determined by the following critical parameters:

Primary Substitution Criteria:

• Interface type: I2C or I2C-compatible protocols
• Voltage supply range: 3V to 3.6V or overlapping range
• Mounting type: Surface Mount
• RoHS compliance: ROHS3 Compliant
• Moisture sensitivity: MSL 1 or MSL 3 (both acceptable for standard applications)
• Base product number: PCA9518 series preferred for direct functional equivalence

Substitute Parts Identified:

1. PCA9518PWR (Texas Instruments) – Direct manufacturer equivalent with same base product number, I2C interface, identical voltage range, and ROHS3 compliance. Package differs (20-TSSOP vs. 20-SSOP) but maintains surface mount compatibility.

2. PI3HDX1204EZLEX (Diodes Incorporated) – Interface category device with ROHS3 compliance and surface mount packaging. Operates at 3.3V supply voltage, which overlaps with the 3V–3.6V range. Different package type (32-TQFN) and application focus (HDMI redriver/level shifter) indicate functional differences.

3. TW3801-TC1-CR (Renesas Electronics Corporation) – Interface category device with ROHS3 compliance and surface mount packaging. Supports multiple interface protocols (MII, RMII) and operates at 1.8V and 3.3V. Significantly different package (100-TQFP) and application scope (security systems) indicate this is a functional alternative only under specific design requirements.

Parameter Comparison

Engineering Selection Recommendations

PCA9518PWR is the primary recommended substitute. It is manufactured by Texas Instruments with the same base product number (PCA9518), operates within the identical voltage supply range (3V–3.6V), supports I2C and SMBus protocols, maintains ROHS3 compliance, and carries Active product status. The package change from 20-SSOP to 20-TSSOP represents a narrower form factor (4.40mm vs. 5.30mm width) but maintains 20-pin surface mount compatibility. This substitute provides direct functional equivalence with improved supply availability.

PI3HDX1204EZLEX and TW3801-TC1-CR are alternative interface devices with ROHS3 compliance and active product status. However, these parts serve different primary applications (HDMI redriver/level shifter and security systems, respectively) and employ different package types and pin counts. Selection of these alternatives requires verification that the specific interface protocols, pin configurations, and application requirements align with the original design intent.

Frequently Asked Questions (FAQ)

Q: Can PCA9518PWR be used as a direct drop-in replacement for PCA9518DBR?

A: PCA9518PWR shares the same base product number, voltage range, and I2C interface functionality. The primary difference is the package type: 20-TSSOP (4.40mm width) versus 20-SSOP (5.30mm width). Both are 20-pin surface mount packages. PCB layout modifications may be required to accommodate the narrower TSSOP footprint. Electrical functionality is equivalent.

Q: What is the significance of the Last Time Buy status for PCA9518DBR?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part number. Existing inventory may be available from distributors, but long-term supply cannot be guaranteed. Transitioning to an active product such as PCA9518PWR ensures sustained availability for future production runs.

Q: Are PI3HDX1204EZLEX and TW3801-TC1-CR suitable for I2C buffer applications?

A: PI3HDX1204EZLEX is designed for HDMI redriver and level shifter applications and does not specify I2C interface support. TW3801-TC1-CR is designed for security systems with MII and RMII interface support, not I2C. These parts are not functionally equivalent for standard I2C buffer applications and should be selected only if the design requirements specifically call for their respective interface protocols and applications.

Q: Do all substitute parts meet the same compliance requirements?

A: All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance profile of PCA9518DBR. Moisture sensitivity levels differ: PCA9518PWR and PI3HDX1204EZLEX are MSL 1 (Unlimited), while TW3801-TC1-CR is MSL 3 (168 Hours). This affects storage and handling requirements during manufacturing.

Q: What is the difference between 20-SSOP and 20-TSSOP packages?

A: Both are 20-pin surface mount packages with similar pin pitch. The primary difference is width: SSOP is 5.30mm wide, while TSSOP is 4.40mm wide. TSSOP represents a more compact form factor. Pin configuration and electrical characteristics remain compatible for the PCA9518 series.