PCA9554DBR Equivalent & Substitute Parts

Part Overview

The PCA9554DBR 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 PCA9554DBR is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Active alternatives from both Texas Instruments and NXP USA Inc. provide functional equivalence with maintained electrical and mechanical compatibility.

Substiute Parts

PCA9554DBR

Texas InstrumentsIn Stock: 3872PCA9554DBR Datasheet

Current PartRFQ

TCA9554DBR

Texas InstrumentsIn Stock: 64463TCA9554DBR Datasheet

MFR RecommendedRFQ

TCA9554PWR

Texas InstrumentsIn Stock: 42237TCA9554PWR Datasheet

MFR RecommendedRFQ

PCA9554ADB,118

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

DirectRFQ

PCA9554DB,118

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9554DBR is determined by strict alignment of the following parameters: 8 I/O count, I2C/SMBus interface support, 400 kHz clock frequency, push-pull output configuration, interrupt output capability, and surface mount packaging in 16-pin SSOP or compatible form factor. All substitute parts maintain these core electrical specifications and compliance certifications.

Substitute parts are grouped into two categories:

Texas Instruments Active Alternatives: TCA9554DBR and TCA9554PWR represent active product line continuations with enhanced voltage supply range (1.65V ~ 5.5V versus 2.3V ~ 5.5V). TCA9554DBR maintains 16-SSOP packaging identical to the main part. TCA9554PWR uses 16-TSSOP packaging (0.173", 4.40mm Width), which is mechanically compatible for surface mount applications but requires PCB footprint adjustment.

NXP USA Inc. Direct Equivalents: PCA9554DB,118 and PCA9554ADB,118 are manufactured by NXP USA Inc. and maintain identical electrical specifications and 16-SSOP packaging to the original PCA9554DBR. These parts preserve the 2.3V ~ 5.5V voltage supply range and are direct functional replacements.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (No Design Changes Required): PCA9554DB,118 and PCA9554ADB,118 from NXP USA Inc. are direct functional equivalents with identical packaging (16-SSOP), voltage supply range (2.3V ~ 5.5V), and electrical specifications. Both parts are active products with full compliance certifications. Selection between these two NXP variants depends on procurement availability and inventory levels.

Texas Instruments Active Alternatives: TCA9554DBR maintains identical 16-SSOP packaging and is a direct pin-compatible replacement. The expanded voltage supply range (1.65V ~ 5.5V) provides additional design flexibility for low-voltage applications. TCA9554PWR offers the same electrical functionality but requires PCB footprint modification due to 16-TSSOP packaging (0.173", 4.40mm Width versus 0.209", 5.30mm Width). Selection of TCA9554PWR is appropriate only when PCB redesign is feasible or when the narrower package footprint provides layout advantages.

Compliance and Availability: All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and REACH unaffected status, ensuring regulatory continuity. Texas Instruments alternatives (TCA9554DBR: 64,405 units; TCA9554PWR: 42,131 units) demonstrate higher inventory availability compared to NXP variants (PCA9554DB,118: 2,744 units; PCA9554ADB,118: 6,913 units).

Frequently Asked Questions (FAQ)

Q: Can TCA9554DBR replace PCA9554DBR without PCB modifications? A: Yes. TCA9554DBR is pin-compatible with identical 16-SSOP packaging dimensions (0.209", 5.30mm Width). No PCB footprint changes are required. The expanded voltage supply range (1.65V ~ 5.5V) is backward compatible with designs specified for 2.3V ~ 5.5V operation.

Q: What is the difference between TCA9554DBR and TCA9554PWR? A: Both parts are functionally equivalent with identical electrical specifications and 400 kHz I2C/SMBus interface. The primary difference is packaging: TCA9554DBR uses 16-SSOP (0.209", 5.30mm Width) while TCA9554PWR uses 16-TSSOP (0.173", 4.40mm Width). TCA9554PWR requires PCB footprint redesign and is not a direct drop-in replacement.

Q: Are NXP PCA9554 variants compatible with the Texas Instruments PCA9554DBR? A: Yes. PCA9554DB,118 and PCA9554ADB,118 from NXP USA Inc. maintain identical electrical specifications, 8 I/O configuration, 400 kHz clock frequency, push-pull output, and 16-SSOP packaging. Both are active products suitable for direct substitution.

Q: Why is the PCA9554DBR classified as obsolete? A: The PCA9554DBR is an older product line designation. Active alternatives from both Texas Instruments (TCA9554 series) and NXP USA Inc. (PCA9554 variants) provide continued functional support with enhanced specifications and improved availability.

Q: What are the key parameters that determine substitution eligibility? A: Substitution requires matching: 8 I/O count, I2C/SMBus interface support, 400 kHz clock frequency, push-pull output configuration, interrupt output capability, surface mount packaging in 16-pin SSOP or compatible form factor, and identical operating temperature range (-40°C ~ 85°C).

Q: Can I use TCA9554PWR if my PCB is designed for 16-SSOP packaging? A: No, without PCB modification. TCA9554PWR uses 16-TSSOP packaging with different pin spacing (0.173", 4.40mm Width versus 0.209", 5.30mm Width). PCB footprint redesign is required for this substitution.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All substitute parts (TCA9554DBR, TCA9554PWR, PCA9554DB,118, PCA9554ADB,118) are ROHS3 compliant with MSL Level 1 rating and REACH unaffected status.