PCA9554PWR I/O Expander Equivalent & Substitute Parts

Part Overview

The PCA9554PWR is an 8-bit I/O expander with I2C and SMBus interface operating at 400 kHz, housed in a 16-TSSOP surface mount package. Manufactured by Texas Instruments, this component is classified as not for new designs, indicating its legacy status in the product lifecycle. The part operates across a 2.3V to 5.5V supply range with push-pull output configuration and includes power-on reset functionality. Finding equivalent and substitute parts is necessary due to the product's discontinued status for new designs and potential inventory constraints.

Substiute Parts

PCA9554PWR

Texas InstrumentsIn Stock: 7319PCA9554PWR Datasheet

Current PartRFQ

TCA9554PWR

Texas InstrumentsIn Stock: 42237TCA9554PWR Datasheet

MFR RecommendedRFQ

PCA8574PW,118

NXP USA Inc.In Stock: 3667PCA8574PW,118 Datasheet

MFR RecommendedRFQ

PCA9554BPWJ

NXP USA Inc.In Stock: 2493PCA9554BPWJ Datasheet

MFR RecommendedRFQ

PCA9554CPWJ

NXP USA Inc.In Stock: 3892PCA9554CPWJ Datasheet

MFR RecommendedRFQ

PCA9554PW,112

NXP USA Inc.In Stock: 3383PCA9554PW,112 Datasheet

MFR RecommendedRFQ

PCA9554PW/Q900,118

NXP USA Inc.In Stock: 3405PCA9554PW/Q900,118 Datasheet

MFR RecommendedRFQ

PCA9654EDTR2G

onsemiIn Stock: 10226PCA9654EDTR2G Datasheet

MFR RecommendedRFQ

PCAL9554CPWJ

NXP USA Inc.In Stock: 732PCAL9554CPWJ Datasheet

MFR RecommendedRFQ

PI4IOE5V9554LEX

Diodes IncorporatedIn Stock: 142674PI4IOE5V9554LEX Datasheet

MFR RecommendedRFQ

XRA1200PIG16TR-F

MaxLinear, Inc.In Stock: 3010XRA1200PIG16TR-F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9554PWR is determined by the following critical parameters:

Primary Substitution Criteria:

• Number of I/O: 8 bits (mandatory match)
• Package / Case: 16-TSSOP form factor (mandatory match for PCB compatibility)
• Mounting Type: Surface Mount (mandatory match)
• Interface: I2C or I2C/SMBus (I2C is the minimum requirement)
• Clock Frequency: 400 kHz minimum (higher frequencies are acceptable)
• Output Type: Push-Pull or Open Drain (both are functionally compatible)
• Voltage Supply Range: Must encompass or overlap with 2.3V ~ 5.5V
• Operating Temperature: Must support -40°C ~ 85°C minimum
• RoHS Compliance: ROHS3 Compliant (regulatory requirement)

Secondary Considerations:

• Current Output Source/Sink ratings may vary within acceptable limits for the application
• Product Status: Active parts are preferred over obsolete parts for new inventory sourcing
• Packaging format (Cut Tape, Tape & Reel, Tube) affects procurement but not electrical compatibility

Substitutes are grouped into two categories: direct replacements with identical or superior electrical specifications, and functional equivalents with minor parameter variations that remain within acceptable operating margins.

Parameter Comparison

Engineering Selection Recommendations

Tier 1 - Direct Replacements (Recommended for New Designs):

TCA9554PWR (Texas Instruments) and PCA9554BPWJ (NXP USA Inc.) are the primary substitutes. Both maintain identical I/O count, package form factor, and clock frequency specifications. TCA9554PWR extends the voltage supply range to 1.65V minimum, providing broader compatibility. Both parts carry Active product status and ROHS3 compliance, making them suitable for ongoing production and new design implementations.

Tier 2 - Functional Equivalents (Compatible with Application Review):

PCA9554CPWJ, PCA9554PW,112, and PCA9554PW/Q900,118 are NXP variants with identical electrical specifications to the main part. These differ only in packaging format (Tape & Reel or Tube) and maintain Active product status. PI4IOE5V9554LEX (Diodes Incorporated) offers 400 kHz operation with identical voltage supply range and is available in high inventory quantities.

Tier 3 - Limited Substitutes (Conditional Use):

PCA8574PW,118 (NXP USA Inc.) operates at 400 kHz with I2C interface but lacks SMBus support. Current output source specification differs (100µA minimum versus 10mA). This part remains functionally compatible for I2C-only applications.

PCA9654EDTR2G (onsemi) operates at reduced clock frequency (100 kHz) and carries Obsolete product status. This part is not recommended for new inventory sourcing despite extended temperature range (-55°C ~ 125°C).

PCAL9554CPWJ (NXP USA Inc., Agile series) provides dual output type capability (Open Drain and Push-Pull) with extended voltage range (1.65V ~ 5.5V) but has limited inventory (703 Pcs).

XRA1200PIG16TR-F (MaxLinear, Inc.) operates with restricted voltage supply range (1.65V ~ 3.6V), limiting compatibility with 5V systems. Open Drain output type requires application-level pull-up resistor configuration.

Selection Criteria by Application Context:

For 5V-only systems: PCA9554PWR, TCA9554PWR, PCA9554BPWJ, PCA9554PW,112, PCA9554PW/Q900,118, or PI4IOE5V9554LEX.

For mixed-voltage systems (1.65V to 5.5V): TCA9554PWR, PCA9554BPWJ, PCA9554CPWJ, PCA9654EDTR2G, or PCAL9554CPWJ.

For I2C-only applications without SMBus requirement: PCA8574PW,118 or PI4IOE5V9554LEX.

For low-voltage applications (1.65V to 3.6V): XRA1200PIG16TR-F with application-level verification of Open Drain output compatibility.

Frequently Asked Questions (FAQ)

Q: Can TCA9554PWR directly replace PCA9554PWR without PCB modifications?

A: Yes. Both parts use identical 16-TSSOP package geometry and pinout. The extended voltage range of TCA9554PWR (1.65V ~ 5.5V versus 2.3V ~ 5.5V) provides backward compatibility. No PCB layout changes are required.

Q: What is the functional difference between I2C and I2C/SMBus interface variants?

A: SMBus is a subset protocol built on I2C with additional timing and electrical specifications. Parts supporting both I2C and SMBus can operate in either mode. Parts supporting I2C only cannot execute SMBus-specific commands. For applications using only I2C protocol, both types are functionally equivalent.

Q: Why does PCA9654EDTR2G operate at 100 kHz instead of 400 kHz?

A: PCA9654EDTR2G is a different product line with reduced clock frequency specification. While electrically compatible for I2C communication, the lower frequency may impact system throughput. This part carries Obsolete status and is not recommended for new inventory acquisition.

Q: Is XRA1200PIG16TR-F suitable for 5V applications?

A: No. XRA1200PIG16TR-F maximum supply voltage is 3.6V, making it incompatible with standard 5V systems. Additionally, its Open Drain output type requires external pull-up resistors, adding circuit complexity. This part is suitable only for dedicated 3.3V or lower voltage domains.

Q: What packaging format differences exist among the PCA9554 variants?

A: Packaging format refers to supply method: Cut Tape (CT) for individual component pickup, Tape & Reel (TR) for automated assembly, and Tube for manual handling. All variants use identical 16-TSSOP component package. Format selection depends on manufacturing process requirements, not electrical compatibility.

Q: Can PCAL9554CPWJ replace PCA9554PWR in existing designs?

A: Yes, with application verification. PCAL9554CPWJ offers dual output type capability (Open Drain and Push-Pull) and extended voltage range (1.65V ~ 5.5V). However, inventory is limited (703 Pcs). Verify that the Agile series designation does not impose additional qualification requirements for your application.

Q: Why does PCA8574PW,118 show lower source current (100µA) than other variants?

A: PCA8574PW,118 is a different product line with different output stage design. The 100µA specification represents minimum source current; 25mA sink current remains standard. For applications requiring higher source current, this part may not be suitable.

Q: Are all listed substitutes ROHS3 compliant?

A: All substitutes except XRA1200PIG16TR-F carry ROHS3 Compliant status. XRA1200PIG16TR-F carries RoHS Compliant status without the "3" designation. Both meet regulatory requirements; the designation difference reflects compliance standard version.

Q: What inventory considerations apply when selecting a substitute?

A: PI4IOE5V9554LEX offers the highest inventory (142,600 Pcs), providing supply chain security. TCA9554PWR (42,131 Pcs) and PCA9654EDTR2G (10,214 Pcs) also maintain substantial stock. PCAL9554CPWJ has limited availability (703 Pcs). For long-term production, prioritize parts with higher inventory levels.