PCA9518DBQR Equivalent & Substitute Parts

Part Overview

The PCA9518DBQR is a specialized interface buffer IC manufactured by Texas Instruments, designed for I2C applications. This component is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The part is housed in a 20-SSOP package and operates within a 3V to 3.6V supply voltage range. Due to its Last Time Buy status, identifying functionally equivalent substitute components is essential for design continuity and long-term product support.

Substiute Parts

PCA9518DBQR

Texas InstrumentsIn Stock: 2219PCA9518DBQR Datasheet

Current PartRFQ

PCA9518PWR

Texas InstrumentsIn Stock: 6115PCA9518PWR Datasheet

MFR RecommendedRFQ

ADP5585ACBZ-04-R7

Analog Devices Inc.In Stock: 12052ADP5585ACBZ-04-R7 Datasheet

MFR RecommendedRFQ

ADP5586ACBZ-01-R7

Analog Devices Inc.In Stock: 947ADP5586ACBZ-01-R7 Datasheet

MFR RecommendedRFQ

TW3801-TC1-CR

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCA9518DBQR are identified based on the following critical parameters:

• Interface Protocol: I2C compatibility is the primary substitution criterion
• Voltage Supply Range: Operating voltage must overlap or be compatible with 3V ~ 3.6V
• Application Category: Buffer or interface specialization
• Mounting Type: Surface mount technology
• Compliance Standards: ROHS3 and REACH compliance maintained across substitutes
• Package Compatibility: Physical package dimensions and pin configurations must support direct or adapter-based replacement

Three substitute parts meet these criteria with varying package configurations and voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

PCA9518PWR is the primary substitute for PCA9518DBQR. Both components are manufactured by Texas Instruments, share identical voltage supply specifications (3V ~ 3.6V), and maintain I2C interface compatibility. The PCA9518PWR is in Active product status with higher inventory availability (6100 units) and improved moisture sensitivity rating (MSL 1 vs. MSL 2). Package transition from 20-SSOP to 20-TSSOP requires PCB layout modification but maintains functional equivalence. SMBus compatibility in PCA9518PWR provides extended protocol support.

ADP5585ACBZ-04-R7 and ADP5586ACBZ-01-R7 are Analog Devices alternatives with I2C interface support and extended voltage range (1.65V ~ 3.6V). These components feature 16-WLCSP packages with superior moisture sensitivity (MSL 1). Application scope includes keypad entries and I/O expansion, providing broader functional capability. Package footprint differs significantly, requiring substantial PCB redesign.

TW3801-TC1-CR from Renesas Electronics operates at 1.8V and 3.3V with MII/RMII interface protocols. This component is suitable only for applications requiring network interface functionality and is not recommended as a direct buffer substitute due to different interface architecture and larger 100-TQFP package.

Frequently Asked Questions (FAQ)

Q: Can PCA9518PWR directly replace PCA9518DBQR without PCB modification?

A: PCA9518PWR maintains electrical compatibility but requires PCB layout changes due to package transition from 20-SSOP to 20-TSSOP. Pin assignments differ between these packages.

Q: What is the voltage compatibility range for substitute selection?

A: The primary operating range is 3V ~ 3.6V. ADP5585ACBZ-04-R7 and ADP5586ACBZ-01-R7 support extended range (1.65V ~ 3.6V), allowing operation at lower voltages if circuit design permits.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original PCA9518DBQR specifications.

Q: Which substitute offers the best moisture sensitivity performance?

A: ADP5585ACBZ-04-R7 and ADP5586ACBZ-01-R7 provide MSL 1 (Unlimited), superior to PCA9518DBQR (MSL 2, 1 Year) and comparable to PCA9518PWR (MSL 1, Unlimited).

Q: Is TW3801-TC1-CR suitable for I2C buffer applications?

A: No. TW3801-TC1-CR implements MII/RMII network interfaces for security systems applications. It is not functionally equivalent for I2C buffer operations.

Q: What inventory considerations apply to substitute selection?

A: PCA9518PWR offers highest availability (6100 units), followed by ADP5585ACBZ-04-R7 (12000 units). ADP5586ACBZ-01-R7 has limited stock (897 units). Original PCA9518DBQR inventory is 2166 units with Last Time Buy status.