PCA9554ATS,118 Equivalent & Substitute Parts

Part Overview

The PCA9554ATS,118 is an 8-bit I/O expander designed for I2C and SMBus communication at 400 kHz, packaged in a 20-LSSOP surface mount configuration. Manufactured by NXP USA Inc., this component operates across a supply voltage range of 2.3V to 5.5V and temperature range of -40°C to 85°C. The device features push-pull output capability with 10mA source and 25mA sink current, along with power-on reset (POR) functionality and interrupt output support.

The PCA9554ATS,118 is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for legacy systems or new designs requiring this functional category.

Substiute Parts

PCA9554ATS,118

NXP USA Inc.In Stock: 686PCA9554ATS,118 Datasheet

Current PartRFQ

PCA9554CPWJ

NXP USA Inc.In Stock: 3892PCA9554CPWJ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9554ATS,118 is determined by the following critical parameters:

• I/O Count: 8-bit configuration
• Communication Protocol: I2C and SMBus compatibility at 400 kHz
• Output Architecture: Push-pull output with specified current ratings (10mA source, 25mA sink)
• Interrupt Capability: Presence of interrupt output
• Power-On Reset: POR feature requirement
• Supply Voltage Compatibility: Operating range overlap
• Temperature Range: -40°C to 85°C operation
• Mounting and Packaging: Surface mount technology

The primary substitute identified is the PCA9554CPWJ, which maintains functional equivalence across all critical parameters while differing in package configuration and supply voltage lower limit.

Parameter Comparison

Engineering Selection Recommendations

The PCA9554CPWJ is the active substitute for the obsolete PCA9554ATS,118. Both components are manufactured by NXP USA Inc. and maintain ROHS3 compliance and unlimited moisture sensitivity level ratings.

The PCA9554CPWJ offers the following advantages:

• Active product status ensures ongoing availability and manufacturing support
• Extended lower supply voltage limit (1.65V vs. 2.3V) provides greater flexibility in low-voltage applications
• Identical functional parameters across I/O count, interface protocol, clock frequency, output characteristics, and interrupt capability
• Equivalent thermal and electrical performance within the specified operating range

The primary design consideration is the package transition from 20-LSSOP to 16-TSSOP. This requires PCB layout modification and footprint redesign. Both packages maintain the same width (0.173", 4.40mm) and are surface mount configurations, but pin count and pitch differ.

Frequently Asked Questions (FAQ)

Q: Can the PCA9554CPWJ directly replace the PCA9554ATS,118 without design changes?

A: Functional replacement is possible, but PCB layout modification is required due to package differences (20-LSSOP vs. 16-TSSOP). Pin assignments and footprints differ between these packages.

Q: What is the significance of the supply voltage range difference (2.3V vs. 1.65V lower limit)?

A: The PCA9554CPWJ supports operation at lower supply voltages. If your application operates above 2.3V, both parts are equivalent. For applications requiring operation below 2.3V, the PCA9554CPWJ provides additional flexibility.

Q: Are the I2C and SMBus protocols identical between these parts?

A: Yes. Both components support I2C and SMBus communication at 400 kHz with identical protocol implementation and register architecture.

Q: What does the package designation change from 20-LSSOP to 16-TSSOP mean for my design?

A: LSSOP (Leaded Shrink Small Outline Package) and TSSOP (Thin Shrink Small Outline Package) are different surface mount package types. The 16-TSSOP has fewer pins than the 20-LSSOP, requiring schematic and PCB redesign. Pin functions must be verified against the respective datasheets.

Q: Are both parts RoHS compliant?

A: Yes. Both the PCA9554ATS,118 and PCA9554CPWJ are ROHS3 compliant with unlimited moisture sensitivity level (MSL 1) ratings.

Q: Why is the PCA9554ATS,118 marked as obsolete?

A: Product obsolescence is determined by the manufacturer. The PCA9554CPWJ represents the active equivalent in the NXP product line and is recommended for new designs and ongoing production support.