PCA9554D,112 Equivalent & Substitute Parts

Part Overview

The PCA9554D,112 is an 8-bit I/O Expander interface circuit manufactured by NXP USA Inc., designed for I2C and SMBus communication at 400 kHz. This component operates across a supply voltage range of 2.3V to 5.5V and features push-pull output configuration with interrupt capability. The part is currently classified as Obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity.

Substiute Parts

PCA9554D,112

NXP USA Inc.In Stock: 866PCA9554D,112 Datasheet

Current PartRFQ

PCA9554D,118

NXP USA Inc.In Stock: 100226PCA9554D,118 Datasheet

DirectRFQ

PCA9554ADW

Texas InstrumentsIn Stock: 2681PCA9554ADW Datasheet

DirectRFQ

PCA9554ADWR

Texas InstrumentsIn Stock: 2168PCA9554ADWR Datasheet

DirectRFQ

PCA9554DW

Texas InstrumentsIn Stock: 3478PCA9554DW Datasheet

DirectRFQ

PCA9554DWR

Texas InstrumentsIn Stock: 2756PCA9554DWR Datasheet

DirectRFQ

PCF8574DW

Texas InstrumentsIn Stock: 68173PCF8574DW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9554D,112 is determined by strict equivalence across the following critical parameters:

• Number of I/O Ports: 8 ports (mandatory match)
• Interface Protocol: I2C and/or SMBus compatibility
• Clock Frequency: 400 kHz operation (or compatible lower frequency for backward compatibility)
• Output Configuration: Push-pull output type
• Supply Voltage Range: Minimum 2.3V to 5.5V coverage
• Current Capability: Output source/sink of 10mA and 25mA
• Package Type: 16-SOIC form factor
• Compliance: ROHS3 compliance and EAR99 classification

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (PCA9554 Series): Parts maintaining identical electrical specifications, clock frequency, and voltage range. These include PCA9554D,118, PCA9554ADW, PCA9554ADWR, PCA9554DW, and PCA9554DWR.

Category B - Functional Alternatives (PCF8574 Series): Parts meeting core I/O expansion requirements with reduced clock frequency (100 kHz) and modified current specifications (1mA source, 25mA sink). PCF8574DW operates on I2C only without SMBus support.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: PCA9554D,118 (NXP USA Inc.) is the preferred substitute. This part maintains identical electrical specifications to the PCA9554D,112 while offering Active product status, ensuring long-term availability and supply chain stability. Both parts are manufactured by NXP USA Inc. and share the same base product number (PCA9554), guaranteeing full functional compatibility.

Secondary Recommendations: PCA9554ADW and PCA9554ADWR (Texas Instruments) provide equivalent electrical performance with 400 kHz I2C/SMBus operation and identical current specifications. Both parts carry Last Time Buy status, indicating limited future availability. PCA9554DW and PCA9554DWR offer the same electrical characteristics but with reduced long-term procurement viability.

Alternative Selection: PCF8574DW (Texas Instruments) functions as a reduced-performance alternative for applications where 100 kHz clock frequency is acceptable. This part operates on I2C protocol only, without SMBus support, and provides reduced source current capability (1mA versus 10mA). PCF8574DW is classified as Obsolete and should be selected only when 400 kHz operation is not required.

All recommended substitutes maintain ROHS3 compliance and EAR99 classification, ensuring regulatory consistency with the original PCA9554D,112 specification.

Frequently Asked Questions (FAQ)

Q: Can PCA9554D,118 directly replace PCA9554D,112 in existing designs?

A: Yes. PCA9554D,118 maintains identical electrical specifications, including 8 I/O ports, 400 kHz I2C/SMBus operation, 2.3V to 5.5V supply range, and 16-SOIC packaging. The parts are functionally interchangeable at the circuit level.

Q: What is the difference between PCA9554 variants (ADW, ADWR, DW, DWR)?

A: Variants differ in packaging format and product status. ADW and DW are supplied in Tube packaging; ADWR and DWR are supplied in Cut Tape (CT) or Digi-Reel format. Product status varies: ADW and ADWR are Last Time Buy; DW is Last Time Buy; DWR is Obsolete. Electrical specifications remain identical across all variants.

Q: Why is PCF8574DW listed as an alternative if it has different specifications?

A: PCF8574DW provides functional I/O expansion capability but operates at reduced clock frequency (100 kHz versus 400 kHz) and reduced source current (1mA versus 10mA). It is suitable only for applications where these reduced specifications are acceptable and SMBus protocol is not required.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (PCA9554D,118, PCA9554ADW, PCA9554ADWR, PCA9554DW, PCA9554DWR, and PCF8574DW) are ROHS3 compliant and maintain EAR99 classification, matching the regulatory status of the original PCA9554D,112.

Q: What packaging options are available for PCA9554 substitutes?

A: PCA9554 substitutes are available in two packaging formats: Tube (standard reel packaging for bulk quantities) and Cut Tape (CT) or Digi-Reel format (for component-level distribution). Both formats use identical 16-SOIC (0.295", 7.50mm Width) package geometry.

Q: Should I prioritize product status when selecting a substitute?

A: Yes. PCA9554D,118 with Active status is the optimal choice for new designs and long-term production. Parts with Last Time Buy status (PCA9554ADW, ADWR, DW) have limited availability windows. Obsolete parts (PCA9554DWR, PCF8574DW) should be selected only when Active or Last Time Buy alternatives are unavailable.