PCA9554ADB I/O Expander 8-Bit I2C Interface

Part Overview

The PCA9554ADB is an 8-bit I/O expander with I2C and SMBus interface operating at 400 kHz. Manufactured by Texas Instruments, this device provides push-pull output capability with interrupt output support and power-on reset (POR) functionality. The part is classified as Last Time Buy status, indicating end-of-life production. Alternative equivalent and substitute parts are available from both Texas Instruments and NXP USA Inc. to support continued system design and procurement requirements.

Substiute Parts

PCA9554ADB

Texas InstrumentsIn Stock: 3334PCA9554ADB 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 for the PCA9554ADB is determined by the following critical parameters: number of I/O pins (8), interface protocol (I2C/SMBus), clock frequency (400 kHz), package type (16-SSOP or 16-TSSOP), output type (push-pull), interrupt output capability, and operating temperature range (-40°C ~ 85°C).

Substitute parts are grouped into two categories:

Category 1: Direct Functional Equivalents (Same Package) Parts maintaining identical 16-SSOP packaging with matching electrical specifications qualify as direct substitutes. These include NXP USA Inc. variants PCA9554ADB,118 and PCA9554DB,118, which preserve PCB layout compatibility.

Category 2: Functional Equivalents with Package Variation Texas Instruments TCA9554ADBR and TCA9554APWR maintain core I/O functionality and interface specifications but differ in packaging format (16-TSSOP for TCA9554APWR) or supply voltage range. The TCA9554 series expands the lower voltage limit to 1.65V, providing broader operational flexibility.

Parameter Comparison

Engineering Selection Recommendations

For Direct PCB Replacement (No Layout Changes): Select NXP USA Inc. parts PCA9554ADB,118 or PCA9554DB,118. Both maintain identical 16-SSOP packaging and voltage specifications (2.3V ~ 5.5V) as the original PCA9554ADB. These parts are in Active product status and provide uninterrupted supply availability.

For Extended Supply Voltage Range: Texas Instruments TCA9554ADBR offers the same 16-SSOP package with expanded lower voltage operation (1.65V ~ 5.5V). This part is Active status and suitable for applications requiring lower supply voltage margins.

For Alternative Package Format: Texas Instruments TCA9554APWR provides 16-TSSOP packaging with extended voltage range (1.65V ~ 5.5V). This option requires PCB layout modification but offers higher inventory availability (164,662 units in stock) and Active product status.

All substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and REACH unaffected status, ensuring regulatory alignment with the original PCA9554ADB.

Frequently Asked Questions (FAQ)

Q: Can PCA9554ADB be replaced with TCA9554APWR without circuit modification? A: No. TCA9554APWR uses 16-TSSOP packaging versus the 16-SSOP package of PCA9554ADB. PCB footprint and layout changes are required. Use TCA9554ADBR for same-package substitution.

Q: What is the key difference between NXP and Texas Instruments variants? A: NXP parts (PCA9554ADB,118 and PCA9554DB,118) maintain the original 2.3V ~ 5.5V supply range. Texas Instruments TCA9554 series expands lower voltage to 1.65V. All maintain identical I/O count, interface, and clock frequency.

Q: Is the PCA9554ADB still in production? A: No. PCA9554ADB is Last Time Buy status. Active alternatives include TCA9554ADBR, TCA9554APWR, PCA9554ADB,118, and PCA9554DB,118.

Q: Do all substitute parts support the same I2C/SMBus clock frequency? A: Yes. All listed substitutes operate at 400 kHz clock frequency with identical I2C and SMBus interface compatibility.

Q: What packaging options are available for direct replacement? A: 16-SSOP packaging is available from both manufacturers: PCA9554ADB,118 and PCA9554DB,118 (NXP), and TCA9554ADBR (Texas Instruments). The 16-TSSOP option (TCA9554APWR) requires layout modification.

Q: Are all substitute parts RoHS compliant? A: Yes. All substitute parts listed are ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).