PCA9554AD,112 Equivalent & Substitute Parts

Part Overview

The PCA9554AD,112 is an 8-bit I/O Expander with I2C and SMBus interface operating at 400 kHz, manufactured by NXP Semiconductors in a 16-SOIC package. This component is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part provides 8 I/O lines with push-pull output configuration, interrupt output capability, and power-on reset (POR) feature, suitable for applications requiring expanded digital I/O control via I2C communication.

Substiute Parts

PCA9554AD,112

NXP SemiconductorsIn Stock: 2148PCA9554AD,112 Datasheet

Current PartRFQ

PCA9554ADW

Texas InstrumentsIn Stock: 2681PCA9554ADW Datasheet

DirectRFQ

PCA9554DW

Texas InstrumentsIn Stock: 3478PCA9554DW Datasheet

DirectRFQ

PCA9554DWR

Texas InstrumentsIn Stock: 2756PCA9554DWR Datasheet

DirectRFQ

PCA9534ADW

Texas InstrumentsIn Stock: 877PCA9534ADW Datasheet

MFR RecommendedRFQ

PCA9534ADWR

Texas InstrumentsIn Stock: 3323PCA9534ADWR Datasheet

MFR RecommendedRFQ

PCA9534DW

Texas InstrumentsIn Stock: 782PCA9534DW Datasheet

MFR RecommendedRFQ

PCA9534DWR

Texas InstrumentsIn Stock: 2205PCA9534DWR Datasheet

MFR RecommendedRFQ

PCA9554ADWR

Texas InstrumentsIn Stock: 2168PCA9554ADWR Datasheet

MFR RecommendedRFQ

PCF8574ADW

Texas InstrumentsIn Stock: 1715PCF8574ADW Datasheet

MFR RecommendedRFQ

PCF8574ADWR

Texas InstrumentsIn Stock: 5469PCF8574ADWR Datasheet

MFR RecommendedRFQ

PCF8574DW

Texas InstrumentsIn Stock: 68173PCF8574DW Datasheet

MFR RecommendedRFQ

PCF8574DWR

Texas InstrumentsIn Stock: 104771PCF8574DWR Datasheet

MFR RecommendedRFQ

TCA9554ADWR

Texas InstrumentsIn Stock: 2611TCA9554ADWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the PCA9554AD,112 is determined by strict equivalence across the following critical parameters:

• 8 I/O lines with identical electrical characteristics
• I2C and SMBus interface support at 400 kHz operation
• Push-pull output configuration with 10mA/25mA source/sink capability
• Supply voltage range 2.3V ~ 5.5V
• Operating temperature range -40°C ~ 85°C
• 16-SOIC package form factor
• Interrupt output and POR functionality
• ROHS3 compliance and MSL Level 1 rating

Substitute parts are grouped into two categories:

Direct Equivalents (PCA9554 Series): Parts maintaining identical electrical specifications and package configuration, differing only in packaging format (Tube, Cut Tape, Tape & Reel).

Manufacturer-Recommended Alternatives (PCA9534 Series): Parts with identical I/O count, interface, frequency, voltage, temperature, and package specifications, representing the recommended upgrade path from the obsolete PCA9554AD,112.

Limited Compatibility (PCF8574 Series): Parts with 8 I/O and I2C interface but operating at 100 kHz (not 400 kHz) and with reduced output source current (1mA vs. 10mA), suitable only for applications not requiring 400 kHz SMBus operation or higher output current.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Full Electrical Equivalence):

PCA9534DWR is the recommended primary substitute. This part maintains complete electrical and functional equivalence to the PCA9554AD,112 while offering Active product status, ensuring long-term availability and manufacturing support. The PCA9534 series represents the manufacturer-recommended upgrade path from the obsolete PCA9554 series.

For applications requiring immediate availability with identical specifications, PCA9554ADW, PCA9554DW, and PCA9554ADWR provide full electrical equivalence with Last Time Buy status, indicating limited future availability.

Secondary Substitutes (Conditional Compatibility):

PCF8574ADWR is suitable only for applications where 100 kHz I2C operation is acceptable and output source current of 1mA meets design requirements. This part does not support SMBus operation at 400 kHz. PCF8574ADWR offers Active status, providing long-term supply continuity for compatible applications.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and MSL Level 1 rating, matching the original part's environmental and regulatory certifications. No additional qualification is required from a compliance perspective.

Frequently Asked Questions (FAQ)

Q: Can PCA9534DWR be used as a direct replacement for PCA9554AD,112?

A: Yes. PCA9534DWR provides complete electrical and functional equivalence across all critical parameters: 8 I/O lines, I2C/SMBus 400 kHz operation, identical supply voltage and temperature ranges, push-pull output with 10mA/25mA capability, and 16-SOIC package. The part is pin-compatible and requires no circuit modifications.

Q: What is the difference between PCA9554 and PCA9534 series?

A: Both series are electrically identical in the parameters specified. The PCA9534 represents the manufacturer-recommended successor to the PCA9554 series. The primary distinction is product lifecycle status: PCA9534 parts are in Active or Last Time Buy status, while PCA9554 parts are Obsolete or Last Time Buy.

Q: Can PCF8574ADWR replace PCA9554AD,112?

A: PCF8574ADWR is not a direct replacement. While both parts provide 8 I/O lines in a 16-SOIC package, the PCF8574 operates at 100 kHz (not 400 kHz) and lacks SMBus support. Additionally, PCF8574 output source current is 1mA compared to 10mA for PCA9554. Use PCF8574ADWR only if your application does not require 400 kHz operation or higher output current.

Q: What packaging formats are available for substitutes?

A: Substitute parts are available in three packaging formats: Tube (standard reel packaging), Cut Tape & Digi-Reel (for automated pick-and-place assembly), and Tape & Reel (for high-volume production). Select based on your assembly process requirements. Electrical specifications remain identical across all packaging formats.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL Level 1 rating, matching the original PCA9554AD,112 specifications. No additional environmental qualification is required.

Q: Which substitute offers the longest supply availability?

A: PCA9534DWR and PCF8574ADWR both carry Active product status, indicating ongoing manufacturing and supply support. PCA9534DWR is recommended for new designs requiring 400 kHz SMBus operation. PCF8574ADWR is suitable only for applications compatible with 100 kHz I2C operation.