PCA9518DWT Equivalent & Substitute Parts

Part Overview

The PCA9518DWT is a specialized interface buffer IC manufactured by Texas Instruments, designed for I2C communication applications. This component is classified as Last Time Buy, indicating it is no longer in active production. The PCA9518DWT is packaged in 20-SOIC format with surface mount technology, operating 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 procurement continuity.

Substiute Parts

PCA9518DWT

Texas InstrumentsIn Stock: 2131PCA9518DWT Datasheet

Current PartRFQ

PCA9518PWR

Texas InstrumentsIn Stock: 6115PCA9518PWR Datasheet

MFR RecommendedRFQ

ADP5585ACBZ-01-R7

Analog Devices Inc.In Stock: 2257ADP5585ACBZ-01-R7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9518DWT is determined by the following critical parameters:

• Interface Protocol: I2C compatibility is mandatory for functional equivalence
• Voltage Supply Range: Operating range must encompass or be compatible with 3V to 3.6V
• Mounting Technology: Surface mount requirement must be maintained
• RoHS Compliance: ROHS3 compliance status ensures regulatory alignment
• Moisture Sensitivity: MSL rating of 1 or equivalent handling requirements

The substitute parts identified maintain these core parameters while offering alternative packaging formats. The PCA9518PWR provides a direct functional equivalent from the same manufacturer with modified package geometry. The ADP5585ACBZ-01-R7 offers I2C interface capability with extended voltage range support, though with different pin count and application focus.

Parameter Comparison

Engineering Selection Recommendations

PCA9518PWR is the primary substitute option. Both parts share identical base product designation (PCA9518), matching voltage supply specifications (3V ~ 3.6V), and equivalent RoHS3 compliance status. The PCA9518PWR maintains active product status, ensuring long-term availability and supply chain continuity. The primary design consideration is package geometry transition from 20-SOIC to 20-TSSOP format, which requires PCB layout modification but maintains pin-to-pin functional compatibility.

ADP5585ACBZ-01-R7 serves as an alternative interface solution with extended voltage range capability (1.65V ~ 3.6V). This part is suitable for applications requiring lower voltage operation or broader supply tolerance. The 16-WLCSP package represents a significant form factor change from the original 20-SOIC, necessitating comprehensive PCB redesign and application-level validation. This option is appropriate for new designs or major revision cycles rather than direct replacement scenarios.

Both substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring equivalent environmental and handling requirements to the original PCA9518DWT.

Frequently Asked Questions (FAQ)

Q: Can PCA9518PWR directly replace PCA9518DWT without design changes?

A: PCA9518PWR maintains functional I2C interface compatibility and identical voltage specifications. However, package geometry differs (20-TSSOP versus 20-SOIC), requiring PCB footprint modification. Pin functionality remains equivalent.

Q: What are the key differences between PCA9518PWR and ADP5585ACBZ-01-R7?

A: PCA9518PWR is a direct functional variant of the PCA9518 series with package format change. ADP5585ACBZ-01-R7 is a different product family with extended voltage range (1.65V minimum) and different pin count (16 versus 20). Selection depends on application voltage requirements and pin configuration needs.

Q: Is the ADP5585ACBZ-01-R7 suitable for direct replacement?

A: ADP5585ACBZ-01-R7 provides I2C interface capability and ROHS3 compliance but differs in pin count, package type (16-WLCSP), and application focus (keypad entries and I/O expansion). Direct replacement requires application-level validation and PCB redesign.

Q: What packaging considerations apply to these substitutes?

A: PCA9518DWT uses 20-SOIC (0.295" width). PCA9518PWR uses 20-TSSOP (0.173" width), offering reduced footprint. ADP5585ACBZ-01-R7 uses 16-WLCSP (1.59x1.59), requiring advanced assembly capabilities. Package selection impacts PCB layout, assembly process, and thermal management.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. PCA9518PWR and ADP5585ACBZ-01-R7 both maintain ROHS3 compliance status, matching the original PCA9518DWT specification.

Q: What is the voltage compatibility range for substitution?

A: PCA9518DWT and PCA9518PWR both operate at 3V ~ 3.6V. ADP5585ACBZ-01-R7 extends the lower limit to 1.65V, providing broader voltage compatibility for applications requiring lower supply voltages.