PCA9518AD,112 Equivalent & Substitute Parts

Part Overview

The PCA9518AD,112 is a specialized interface buffer IC manufactured by NXP USA Inc., designed for I2C and SMBus applications. This 20-SO package device operates within a 3V to 3.6V supply voltage range and functions as a buffer interface for system-level signal conditioning. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

PCA9518AD,112

NXP USA Inc.In Stock: 815PCA9518AD,112 Datasheet

Current PartRFQ

ADP5585ACPZ-01-R7

Analog Devices Inc.In Stock: 3981ADP5585ACPZ-01-R7 Datasheet

MFR RecommendedRFQ

MAX14502AETL+

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9518AD,112 is determined by the following critical parameters:

• Interface Protocol Compatibility: Both substitute parts support I2C protocol, which is the primary communication interface for the original device
• Supply Voltage Range: Substitute parts must operate within overlapping voltage specifications. The PCA9518AD,112 operates at 3V ~ 3.6V; acceptable substitutes must support this range or a compatible subset
• Package Type: Surface mount technology is maintained across all alternatives
• RoHS Compliance: All substitute parts maintain ROHS3 compliance, ensuring regulatory alignment
• Moisture Sensitivity: MSL ratings are provided for handling and storage considerations

The two identified substitute parts (ADP5585ACPZ-01-R7 and MAX14502AETL+) meet these core substitution criteria, though each presents distinct functional characteristics and package configurations.

Parameter Comparison

Engineering Selection Recommendations

ADP5585ACPZ-01-R7: This substitute maintains I2C protocol compatibility and extends the lower voltage operating range to 1.65V, providing greater flexibility for multi-voltage system designs. The device is in active production status, ensuring long-term availability. The 16-LFCSP package represents a significant size reduction compared to the original 20-SOIC package. MSL rating of 3 requires adherence to 168-hour moisture exposure limits during storage and handling.

MAX14502AETL+: This alternative supports both I2C and 2-Wire Serial protocols, offering broader interface compatibility. The device operates within 1.8V ~ 3.3V range, which overlaps with the original specification at the upper boundary. Active production status guarantees supply continuity. The 40-TQFN package is larger than the original 20-SOIC, requiring PCB layout modifications. MSL rating of 1 provides unlimited moisture exposure tolerance, matching the original device's handling characteristics.

Both substitutes maintain ROHS3 compliance and are classified as active products, ensuring regulatory alignment and ongoing manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can the ADP5585ACPZ-01-R7 directly replace the PCA9518AD,112 in existing designs?

A: Direct replacement requires PCB layout modification due to package differences (16-LFCSP versus 20-SOIC). Pin configuration and functional mapping must be verified against device datasheets. The extended lower voltage range (1.65V) is compatible with the original 3V ~ 3.6V specification.

Q: What are the package implications of using MAX14502AETL+ as a substitute?

A: The MAX14502AETL+ uses a 40-TQFN package, which is larger than the original 20-SOIC package. This requires significant PCB redesign, including trace routing and component placement modifications. Pin count and functional assignments differ substantially from the original device.

Q: Are there moisture handling differences between the substitute parts?

A: Yes. The ADP5585ACPZ-01-R7 has MSL rating 3, requiring storage at controlled humidity (168-hour maximum exposure). The MAX14502AETL+ has MSL rating 1, matching the original device's unlimited moisture tolerance. Manufacturing and assembly processes must account for these differences.

Q: Do both substitutes support SMBus protocol like the original PCA9518AD,112?

A: The ADP5585ACPZ-01-R7 supports I2C protocol. The MAX14502AETL+ supports I2C and 2-Wire Serial protocols. Neither explicitly lists SMBus support in the provided specifications. System-level protocol compatibility must be verified against application requirements.

Q: What is the inventory status of these substitute parts?

A: ADP5585ACPZ-01-R7 has 3,960 units in stock. MAX14502AETL+ has 21,242 units in stock. Both are actively manufactured and available through distribution channels.