PCA9554PW/DG,118 Equivalent & Substitute Parts

Part Overview

The PCA9554PW/DG,118 is an 8-bit I/O Expander with I2C and SMBus interface operating at 400 kHz, manufactured by NXP USA Inc. in a 16-TSSOP surface mount package. This part is classified as Obsolete, necessitating identification of equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across I/O count, interface protocol, and electrical operating parameters while accommodating modern product status and availability.

Substiute Parts

PCA9554PW/DG,118

NXP USA Inc.In Stock: 1125PCA9554PW/DG,118 Datasheet

Current PartRFQ

PCA9554PW,118

NXP USA Inc.In Stock: 2765PCA9554PW,118 Datasheet

DirectRFQ

PCA9654EDTR2G

onsemiIn Stock: 10226PCA9654EDTR2G Datasheet

MFR RecommendedRFQ

PI4IOE5V9554LEX

Diodes IncorporatedIn Stock: 142674PI4IOE5V9554LEX Datasheet

MFR RecommendedRFQ

TCA9534APWR

Texas InstrumentsIn Stock: 2376TCA9534APWR Datasheet

MFR RecommendedRFQ

TCA9534PWR

Texas InstrumentsIn Stock: 165243TCA9534PWR Datasheet

MFR RecommendedRFQ

TCA9554APWR

Texas InstrumentsIn Stock: 164732TCA9554APWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9554PW/DG,118 is determined by the following critical parameters:

Primary Compatibility Criteria:

• 8 I/O lines (non-negotiable for pin-compatible replacement)
• I2C interface support (required for protocol compatibility)
• 400 kHz clock frequency (matches original specification)
• 16-TSSOP package (maintains PCB layout compatibility)
• Push-Pull output type (ensures electrical behavior equivalence)
• 10mA, 25mA output current capability (functional requirement)

Secondary Compatibility Criteria:

• Voltage supply range (minimum 2.3V ~ 5.5V overlap required)
• Operating temperature range (-40°C ~ 85°C minimum)
• Interrupt output capability (functional feature)
• RoHS3 compliance and MSL rating (regulatory and handling requirements)

Substitute parts are grouped based on adherence to these parameters. Parts meeting all primary criteria are direct functional equivalents. Parts with extended voltage or temperature ranges provide enhanced operational flexibility while maintaining core functionality.

Parameter Comparison

Engineering Selection Recommendations

Tier 1 - Direct Functional Equivalents (Recommended for New Designs):

PCA9554PW,118 (NXP USA Inc.) and TCA9554APWR (Texas Instruments) are the primary substitutes. Both maintain identical I/O configuration, interface protocol (I2C/SMBus), 400 kHz clock frequency, Push-Pull output type, and specified output current. PCA9554PW,118 is the direct NXP equivalent with Active product status and higher inventory availability (2752 pcs). TCA9554APWR provides an alternative from Texas Instruments with Active status, extended voltage range (1.65V minimum), and substantial inventory (164,662 pcs).

Tier 2 - Functional Alternatives (Conditional Substitution):

TCA9534PWR (Texas Instruments) and TCA9534APWR (Texas Instruments) provide 8-bit I/O expansion at 400 kHz with Push-Pull output and Active product status. These parts omit SMBus support, limiting substitution to I2C-only applications. Both offer extended voltage range (1.65V minimum) and are available in quantity.

PI4IOE5V9554LEX (Diodes Incorporated) maintains 8-bit I/O, I2C interface, 400 kHz operation, and matching voltage range (2.3V ~ 5.5V). Output type and current specifications are not provided in available data. Active product status and high inventory (142,600 pcs) support production continuity.

Tier 3 - Limited Compatibility (Not Recommended):

PCA9654EDTR2G (onsemi) operates at reduced clock frequency (100 kHz) and is classified as Obsolete. While it provides 8-bit I/O and I2C interface, the lower clock frequency and obsolete status make it unsuitable for direct replacement in applications requiring 400 kHz operation.

All recommended substitutes maintain RoHS3 compliance, MSL Level 1 rating, and 16-TSSOP packaging for PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can PCA9554PW,118 directly replace PCA9554PW/DG,118?

A: Yes. Both parts are NXP I/O expanders with identical electrical specifications: 8 I/O lines, I2C/SMBus interface, 400 kHz clock frequency, 2.3V ~ 5.5V supply range, -40°C ~ 85°C operating temperature, Push-Pull output, and 10mA/25mA output current. The primary difference is product status (Active vs. Obsolete) and packaging format. Functional compatibility is complete.

Q: What is the difference between TCA9554APWR and TCA9534PWR?

A: Both are Texas Instruments 8-bit I/O expanders in 16-TSSOP packages with 400 kHz I2C operation and Push-Pull output. TCA9554APWR supports both I2C and SMBus protocols with specified 10mA/25mA output current. TCA9534PWR supports I2C only and does not specify output current capability. Selection depends on whether SMBus protocol support is required in the application.

Q: Why is clock frequency critical for substitution?

A: Clock frequency determines I2C bus speed and data transfer rate. The original PCA9554PW/DG,118 operates at 400 kHz (Fast-mode I2C). Substitutes must match this frequency to maintain timing compatibility with the I2C bus and host controller. PCA9654EDTR2G operates at 100 kHz (Standard-mode), making it unsuitable for applications designed around 400 kHz operation.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts listed are available in 16-TSSOP (0.173", 4.40mm Width) surface mount package, ensuring PCB layout and footprint compatibility without design modification.

Q: What does "Push-Pull output type" mean for substitution?

A: Push-Pull output means the I/O pins actively drive both high and low logic states through internal transistor pairs. This is the standard output configuration for I/O expanders and ensures predictable electrical behavior. All recommended Tier 1 and Tier 2 substitutes specify Push-Pull output, maintaining electrical equivalence.

Q: Can I use PI4IOE5V9554LEX if output specifications are not provided?

A: PI4IOE5V9554LEX matches the core functional parameters (8 I/O, I2C, 400 kHz, 2.3V ~ 5.5V, -40°C ~ 85°C, 16-TSSOP) and maintains Active product status with high availability. However, unspecified output type and current capability introduce uncertainty in electrical behavior. Verification against application requirements is necessary before selection.

Q: Why is product status important?

A: Product status indicates manufacturer support and long-term availability. Obsolete parts (PCA9554PW/DG,118, PCA9654EDTR2G) have limited or discontinued production, creating supply risk. Active parts (PCA9554PW,118, TCA9554APWR, TCA9534PWR, PI4IOE5V9554LEX) have ongoing production and support, ensuring availability for current and future production runs.