PCA9554ADW Equivalent & Substitute Parts

Part Overview

The PCA9554ADW is an 8-bit I/O expander IC manufactured by Texas Instruments, designed for I2C and SMBus communication at 400 kHz. The device features push-pull output configuration with interrupt output capability and power-on reset (POR) functionality. Currently classified as Last Time Buy, alternative equivalent parts are necessary for long-term design continuity and component availability assurance.

Substiute Parts

PCA9554ADW

Texas InstrumentsIn Stock: 2681PCA9554ADW Datasheet

Current PartRFQ

TCA9554ADWR

Texas InstrumentsIn Stock: 2611TCA9554ADWR Datasheet

MFR RecommendedRFQ

TCA9554APWR

Texas InstrumentsIn Stock: 164732TCA9554APWR Datasheet

MFR RecommendedRFQ

PCA9554D,118

NXP USA Inc.In Stock: 100226PCA9554D,118 Datasheet

DirectRFQ

PCA9554AD,118

NXP USA Inc.In Stock: 3992PCA9554AD,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9554ADW is determined by the following critical parameters:

• I/O Configuration: 8-bit I/O expander functionality
• Communication Protocol: I2C and SMBus compatibility at 400 kHz
• Electrical Characteristics: Push-pull output type with interrupt output and POR features
• Package Compatibility: 16-SOIC form factor with identical pin configuration
• Voltage Supply Range: Minimum 2.3V operation requirement
• Output Current Capability: 10mA and 25mA source/sink specifications
• Environmental Compliance: ROHS3 compliance and MSL Level 1 rating

Substitute parts are grouped into two categories: Texas Instruments TCA9554 series variants (different packaging) and NXP PCA9554 series variants (same manufacturer lineage). All substitutes maintain functional equivalence through identical I/O count, interface protocol, clock frequency, and output characteristics.

Parameter Comparison

Engineering Selection Recommendations

Direct Pin-Compatible Substitutes (16-SOIC Package)

PCA9554D,118 and PCA9554AD,118 are direct substitutes for PCA9554ADW with identical 16-SOIC packaging. Both are manufactured by NXP USA Inc. and maintain active product status, ensuring long-term availability. These parts are suitable for designs requiring no PCB layout modifications.

Texas Instruments TCA9554 Series Alternatives

TCA9554ADWR maintains the 16-SOIC package format with active product status from Texas Instruments. The extended voltage supply range (1.65V ~ 5.5V) provides additional design flexibility for low-voltage applications. TCA9554APWR offers the same functional specifications but in 16-TSSOP package format, requiring PCB layout redesign but offering reduced board space footprint.

Compliance and Availability Considerations

All substitute parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage protocols. Active product status for TCA9554 and PCA9554 NXP variants guarantees continued component availability, addressing the Last Time Buy status of the original PCA9554ADW.

Frequently Asked Questions (FAQ)

Q: Can TCA9554APWR replace PCA9554ADW directly on the PCB?

A: TCA9554APWR is functionally equivalent but uses 16-TSSOP packaging instead of 16-SOIC. Direct PCB substitution is not possible without layout modification. The 16-TSSOP package has different pin spacing and footprint dimensions. PCB redesign is required for this substitution.

Q: What is the key difference between TCA9554ADWR and PCA9554D,118?

A: Both maintain 16-SOIC packaging and identical I/O functionality. TCA9554ADWR is manufactured by Texas Instruments with extended voltage range (1.65V ~ 5.5V), while PCA9554D,118 is manufactured by NXP with standard voltage range (2.3V ~ 5.5V). Selection depends on manufacturer preference and voltage supply requirements.

Q: Are all substitutes compatible with existing I2C/SMBus firmware?

A: Yes. All substitute parts maintain identical I2C and SMBus 400 kHz protocol implementation, 8-bit I/O configuration, and push-pull output characteristics. No firmware modifications are required for functional substitution.

Q: Does the packaging format affect electrical performance?

A: Packaging format (Tube, Tape & Reel, Cut Tape) affects component handling and storage but does not alter electrical performance. All variants maintain identical electrical specifications within their respective voltage and temperature ranges.

Q: Why do some substitutes show unspecified output current ratings?

A: TCA9554ADWR does not specify output current source/sink values in the provided data. For applications requiring confirmed 10mA and 25mA output capability, select PCA9554D,118, PCA9554AD,118, or TCA9554APWR.