PCA9554ADBR I/O Expander Equivalent & Substitute Parts

Part Overview

The PCA9554ADBR is an 8-bit I/O expander interface circuit 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 functionality. The PCA9554ADBR is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. Substitute parts maintain functional compatibility while offering active product status and extended availability.

Substiute Parts

PCA9554ADBR

Texas InstrumentsIn Stock: 7943PCA9554ADBR Datasheet

Current PartRFQ

TCA9554ADBR

Texas InstrumentsIn Stock: 2991TCA9554ADBR Datasheet

MFR RecommendedRFQ

TCA9554APWR

Texas InstrumentsIn Stock: 164732TCA9554APWR Datasheet

MFR RecommendedRFQ

PCA9554ADB,118

NXP USA Inc.In Stock: 6981PCA9554ADB,118 Datasheet

DirectRFQ

PCA9554DB,118

NXP USA Inc.In Stock: 2804PCA9554DB,118 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following core parameters: 8 I/O count, I2C/SMBus interface protocol, 400 kHz clock frequency, push-pull output type, interrupt output capability, and POR feature. All substitute parts maintain these functional requirements. Package type variations (16-SSOP versus 16-TSSOP) and voltage supply range differences are secondary considerations that do not prevent functional substitution when PCB layout and power supply specifications accommodate the alternative package or voltage rating.

The substitute parts are grouped into two categories:

MFR Recommended Substitutes (Texas Instruments): TCA9554ADBR and TCA9554APWR represent active alternatives from the original manufacturer, offering improved product status and extended lifecycle support.

Direct Manufacturer Substitutes (NXP USA Inc.): PCA9554ADB,118 and PCA9554DB,118 provide functional equivalence from an alternative manufacturer while maintaining the same base product architecture.

Parameter Comparison

Engineering Selection Recommendations

TCA9554ADBR is the primary recommended substitute, offering identical 16-SSOP package compatibility with the original PCA9554ADBR while providing active product status from Texas Instruments. The extended voltage supply range (1.65V ~ 5.5V) provides additional design flexibility for low-voltage applications. This part is suitable for direct replacement in existing designs without PCB modifications.

TCA9554APWR serves as an alternative when 16-TSSOP package compatibility is acceptable. The narrower package width (4.40mm versus 5.30mm) requires PCB layout verification but offers the same functional performance and active status. This option provides the highest inventory availability among all substitutes.

PCA9554ADB,118 and PCA9554DB,118 provide functional equivalence from NXP USA Inc. with identical 16-SSOP package dimensions and voltage supply specifications matching the original part. Both parts maintain active product status and full compliance certifications. Selection between these NXP alternatives depends on packaging format requirements (Tape & Reel format) and supplier availability.

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and identical operating temperature ranges, ensuring compatibility with existing manufacturing and environmental specifications.

Frequently Asked Questions (FAQ)

Q: Can TCA9554ADBR replace PCA9554ADBR in existing designs?

A: Yes. TCA9554ADBR maintains identical 16-SSOP package dimensions, pin configuration, and all functional parameters. The extended voltage supply range (1.65V ~ 5.5V) is backward compatible with designs specified for 2.3V ~ 5.5V operation. No PCB modifications are required.

Q: What is the difference between TCA9554ADBR and TCA9554APWR?

A: Both parts are functionally equivalent with identical electrical specifications. The primary difference is package type: TCA9554ADBR uses 16-SSOP (0.209" width), while TCA9554APWR uses 16-TSSOP (0.173" width). PCB footprint compatibility must be verified before selection. TCA9554APWR offers significantly higher inventory availability.

Q: Are NXP parts (PCA9554ADB,118 and PCA9554DB,118) compatible with the original Texas Instruments PCA9554ADBR?

A: Yes. Both NXP parts provide functional equivalence with identical 16-SSOP package dimensions and voltage supply specifications (2.3V ~ 5.5V). Pin configuration and electrical performance match the original part. Selection depends on supplier availability and packaging format preference (Tape & Reel).

Q: Does the extended voltage range of TCA9554ADBR (1.65V ~ 5.5V) affect compatibility?

A: No. The extended lower voltage limit (1.65V versus 2.3V) is a superset of the original specification and does not affect designs operating within the original 2.3V ~ 5.5V range. This provides additional flexibility for future low-voltage applications.

Q: What packaging format differences exist among the substitute parts?

A: PCA9554ADBR, TCA9554ADBR, and NXP parts are available in Cut Tape (CT) & Digi-Reel or Tape & Reel (TR) formats. TCA9554APWR is available in Cut Tape & Digi-Reel format. Packaging format selection depends on production volume and assembly process requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original PCA9554ADBR specifications.