PCA9554ATS,112 Equivalent & Substitute Parts

Part Overview

The PCA9554ATS,112 is an 8-bit I/O expander with I2C and SMBus interface operating at 400 kHz, manufactured by NXP USA Inc. in a 20-SSOP surface mount package. This device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement planning. The part provides push-pull output configuration with interrupt capability and power-on reset (POR) feature, suitable for applications requiring expanded I/O capabilities in embedded systems.

Substiute Parts

PCA9554ATS,112

NXP USA Inc.In Stock: 1070PCA9554ATS,112 Datasheet

Current PartRFQ

PCA9554CPWJ

NXP USA Inc.In Stock: 3892PCA9554CPWJ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9554ATS,112 is determined by the following critical parameters:

• I/O Count: 8-bit configuration
• Interface Protocol: I2C and SMBus compatibility at 400 kHz
• Output Configuration: Push-pull output type with interrupt capability
• Supply Voltage Range: Minimum 2.3V operation requirement
• Output Current Capability: 10mA source and 25mA sink specifications
• Operating Temperature Range: -40°C to 85°C
• Package Compatibility: Surface mount technology with SSOP/TSSOP footprint considerations

The PCA9554CPWJ qualifies as a direct functional substitute based on matching all critical electrical parameters. While the package changes from 20-SSOP to 16-TSSOP, the core I/O expansion functionality, interface protocol, and electrical specifications remain equivalent. The substitute part maintains active product status and broader supply voltage range (1.65V ~ 5.5V), providing enhanced flexibility for new designs.

Parameter Comparison

Engineering Selection Recommendations

The PCA9554CPWJ is the primary substitute for the obsolete PCA9554ATS,112. Selection is justified on the following basis:

Product Status: The PCA9554CPWJ maintains active product status with NXP USA Inc., ensuring long-term availability and supply chain continuity compared to the obsolete original part.

Electrical Equivalence: All critical electrical parameters match the original specification, including I/O count, interface protocol, clock frequency, output current capability, and operating temperature range. The substitute part extends the minimum supply voltage to 1.65V, providing additional design flexibility without compromising compatibility.

Compliance: Both parts maintain ROHS3 compliance and identical moisture sensitivity levels, ensuring regulatory and environmental compatibility.

Package Consideration: The transition from 20-SSOP to 16-TSSOP requires PCB layout modification. The identical body width (0.173", 4.40mm) simplifies mechanical integration, though pin count reduction necessitates circuit redesign verification.

Frequently Asked Questions (FAQ)

Q: Can the PCA9554CPWJ directly replace the PCA9554ATS,112 without circuit modification?

A: Electrical functionality is equivalent, but the package change from 20-SSOP to 16-TSSOP requires PCB layout redesign. Pin assignments must be verified against both datasheets to ensure correct signal routing.

Q: What is the primary reason for substitution?

A: The PCA9554ATS,112 is classified as obsolete. The PCA9554CPWJ provides identical I/O expansion functionality with active product status and improved supply voltage range.

Q: Are there compatibility concerns with the supply voltage range difference?

A: The PCA9554CPWJ operates at 1.65V ~ 5.5V versus the original 2.3V ~ 5.5V. This extended lower voltage limit is backward compatible with designs operating above 2.3V and provides additional flexibility for lower-voltage applications.

Q: How do the output current specifications compare?

A: Both parts provide identical push-pull output current capability of 10mA source and 25mA sink, ensuring equivalent drive capability for connected loads.

Q: What packaging format is available for the substitute part?

A: The PCA9554CPWJ is supplied in Tape & Reel (TR) format, standard for high-volume production environments.