PCA9554ADGVR Equivalent & Substitute Parts

Part Overview

The PCA9554ADGVR is an 8-bit I/O expander designed for I2C and SMBus communication at 400 kHz, packaged in a 16-TVSOP surface mount configuration. This device provides push-pull output capability with interrupt output functionality and power-on reset (POR) features. The part is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring this I/O expansion functionality.

Substiute Parts

PCA9554ADGVR

Texas InstrumentsIn Stock: 2502PCA9554ADGVR Datasheet

Current PartRFQ

TCA9554APWR

Texas InstrumentsIn Stock: 164732TCA9554APWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9554ADGVR is determined by the following critical parameters:

• I/O Count: Must provide 8 I/O lines
• Interface Protocol: Must support I2C and SMBus at 400 kHz
• Output Configuration: Must feature push-pull output with interrupt capability
• Current Specifications: Must support 10mA and 25mA source/sink capability
• Supply Voltage Range: Must operate within or encompass the 2.3V ~ 5.5V range
• Operating Temperature: Must support -40°C ~ 85°C range
• Compliance: Must maintain ROHS3 compliance and MSL 1 rating

The TCA9554APWR meets all functional and electrical requirements for direct substitution. While the package format differs (16-TSSOP versus 16-TVSOP), both are 16-pin surface mount packages with identical 0.173" width and 4.40mm pitch, permitting PCB layout compatibility with minor footprint adjustments.

Parameter Comparison

Engineering Selection Recommendations

The TCA9554APWR is the direct functional equivalent for the PCA9554ADGVR. Selection of the substitute part is supported by the following factors:

• Product Status: The TCA9554APWR maintains Active status, ensuring continued availability and supply chain stability, whereas the PCA9554ADGVR is in Last Time Buy phase.
• Electrical Compatibility: All functional parameters, including I/O count, interface protocols, output specifications, and operating ranges, are identical or superior.
• Supply Voltage Enhancement: The TCA9554APWR extends the lower supply voltage limit to 1.65V, providing greater flexibility in low-voltage applications while maintaining full compatibility with the original 2.3V ~ 5.5V range.
• Compliance Certification: Both parts maintain identical ROHS3 compliance and MSL 1 ratings, ensuring regulatory and environmental compatibility.
• Package Compatibility: The 16-TSSOP package of the TCA9554APWR is mechanically compatible with the 16-TFSOP footprint, requiring only standard PCB layout adjustments for the TSSOP variant.

Frequently Asked Questions (FAQ)

Q: Can the TCA9554APWR be used as a direct replacement for the PCA9554ADGVR without firmware changes?

A: Yes. Both devices implement identical I2C/SMBus protocols, register maps, and functional behavior. No firmware or software modifications are required for substitution.

Q: What is the difference between the 16-TFSOP and 16-TSSOP packages?

A: Both packages are 16-pin surface mount configurations with identical 0.173" width and 4.40mm pitch. The primary difference is the body thickness and lead configuration. PCB footprints require minor adjustments, but the pin spacing and electrical connectivity remain compatible.

Q: Does the extended supply voltage range of the TCA9554APWR (1.65V ~ 5.5V) affect compatibility?

A: No. The extended lower voltage limit of the TCA9554APWR is a superset of the original PCA9554ADGVR specification (2.3V ~ 5.5V). Applications operating within the original voltage range experience no functional changes.

Q: Are there any differences in interrupt output behavior between these parts?

A: No. Both devices provide identical interrupt output functionality with the same electrical characteristics and timing specifications.

Q: What is the inventory status of the TCA9554APWR?

A: The TCA9554APWR has 164,662 units in stock as new original inventory, providing substantial supply availability compared to the Last Time Buy status of the PCA9554ADGVR.