PCA9554DW I/O Expander Equivalent & Substitute Parts

Part Overview

The PCA9554DW is an 8-bit I/O expander IC designed for I2C and SMBus communication at 400 kHz, manufactured by Texas Instruments in a 16-SOIC package. This device provides push-pull output capability with interrupt functionality and power-on reset features, operating across a 2.3V to 5.5V supply range and -40°C to 85°C temperature range. The part is currently in Last Time Buy status, making equivalent and substitute parts essential for ongoing design support and production continuity.

Substiute Parts

PCA9554DW

Texas InstrumentsIn Stock: 3478PCA9554DW Datasheet

Current PartRFQ

TCA9554DWR

Texas InstrumentsIn Stock: 770TCA9554DWR Datasheet

MFR RecommendedRFQ

TCA9554PWR

Texas InstrumentsIn Stock: 42237TCA9554PWR 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 PCA9554DW is determined by the following critical parameters: 8 I/O count, I2C/SMBus interface support, 400 kHz clock frequency, push-pull output configuration, interrupt output capability, and POR feature. Voltage supply range compatibility and operating temperature range must meet or exceed the original specification. Package type and form factor are secondary considerations; parts in different packages (16-SOIC vs. 16-TSSOP) are functionally equivalent but require PCB layout modifications.

The substitute parts are grouped into two categories:

Category 1: Texas Instruments TCA9554 Series – Direct functional equivalents with identical I/O architecture and interface specifications. TCA9554DWR and TCA9554PWR differ primarily in packaging format (Tape & Reel vs. Cut Tape & Digi-Reel) and supply voltage range (1.65V minimum vs. 2.3V minimum).

Category 2: NXP PCA9554 Series – Direct manufacturer alternatives from NXP USA Inc., maintaining identical electrical specifications and package compatibility with the original PCA9554DW. PCA9554D,118 and PCA9554AD,118 are functionally interchangeable, differing only in packaging format.

Parameter Comparison

Engineering Selection Recommendations

For direct pin-compatible replacement in 16-SOIC package: PCA9554D,118 or PCA9554AD,118 from NXP USA Inc. are the primary alternatives, maintaining identical package geometry and electrical specifications. Both parts are in Active product status with substantial inventory availability.

For Texas Instruments continuity: TCA9554DWR provides equivalent functionality in 16-SOIC packaging with extended lower voltage support (1.65V minimum). TCA9554PWR offers the same electrical performance in 16-TSSOP packaging, suitable for designs where package footprint optimization is required.

Compliance and certification: All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and REACH unaffected status, matching the original PCA9554DW specifications. All parts carry EAR99 ECCN classification and identical HTSUS codes.

Inventory considerations: PCA9554D,118 offers the highest stock availability (100,200 units), followed by TCA9554PWR (42,131 units), making these options preferable for high-volume production requirements.

Frequently Asked Questions (FAQ)

Q: Can TCA9554PWR replace PCA9554DW in existing designs? A: TCA9554PWR is functionally equivalent but uses 16-TSSOP packaging instead of 16-SOIC. PCB layout modifications are required. Electrical specifications and I/O functionality are identical.

Q: What is the difference between PCA9554D,118 and PCA9554AD,118? A: Both parts are from NXP USA Inc. with identical electrical specifications and 16-SOIC packaging. The primary difference is packaging format: PCA9554D,118 is supplied in Cut Tape & Digi-Reel format, while PCA9554AD,118 is supplied in Tape & Reel format.

Q: Are TCA9554DWR and TCA9554PWR interchangeable? A: Both are Texas Instruments TCA9554 variants with identical electrical performance. TCA9554DWR uses 16-SOIC packaging (direct footprint match to PCA9554DW), while TCA9554PWR uses 16-TSSOP packaging. Selection depends on PCB layout requirements.

Q: Does the extended voltage range of TCA9554 series (1.65V minimum) provide any advantage? A: The TCA9554 series supports lower minimum supply voltage (1.65V vs. 2.3V), offering design flexibility for low-power applications. For designs operating at 2.3V or higher, this difference is not a functional consideration.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and REACH unaffected status, matching the original PCA9554DW environmental certifications.

Q: Which substitute part has the best inventory availability? A: PCA9554D,118 from NXP USA Inc. has the highest stock level at 100,200 units, followed by TCA9554PWR at 42,131 units.