PCA9554APW I/O Expander Equivalent & Substitute Parts

Part Overview

The PCA9554APW is an 8-bit I/O expander with I2C and SMBus interface operating at 400 kHz, manufactured by Texas Instruments in a 16-TSSOP surface mount package. This device provides push-pull output capability with 10mA/25mA source/sink current and operates across a 2.3V to 5.5V supply range with -40°C to 85°C temperature rating. The part is currently in Last Time Buy status, making equivalent and substitute parts necessary for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Number of I/O	8
Interface	I2C, SMBus
Clock Frequency	400 kHz
Voltage Supply Range	2.3V ~ 5.5V
Output Type	Push-Pull
Current Output Source/Sink	10mA, 25mA
Operating Temperature	-40°C ~ 85°C
Package	16-TSSOP (0.173", 4.40mm Width)
Interrupt Output	Yes
Features	POR
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the PCA9554APW is determined by strict alignment of electrical and mechanical parameters. The critical substitution criteria are:

Number of I/O: 8 channels required
Interface Protocol: I2C and/or SMBus support
Clock Frequency: 400 kHz operation
Package: 16-TSSOP form factor
Voltage Supply Range: Minimum 2.3V support
Output Type: Push-Pull configuration
Current Capability: 10mA/25mA source/sink
Operating Temperature: -40°C to 85°C range
Interrupt Output: Present
RoHS3 Compliance: Required

Substitute parts are grouped into two categories:

Direct Equivalents (Same Base Product Number): PCA9554APW,118, PCA9554PW,112, and PCA9554PW,118 from NXP USA Inc. These parts share the identical PCA9554 base product number and meet all electrical specifications of the original part.

Functional Equivalents (Different Manufacturer/Series): TCA9554APWR (Texas Instruments), PCAL9554BPWJ (NXP, Agile series), PCA8574APW,118 (NXP), and PI4IOE5V9554ALEX (Diodes Incorporated) provide equivalent I/O expansion functionality with compatible electrical parameters and 16-TSSOP packaging.

Limited Compatibility: PCA9654EDTR2G (onsemi) operates at 100 kHz clock frequency instead of 400 kHz and is marked Obsolete, limiting its suitability for new designs requiring full 400 kHz performance.

Parameter Comparison

Part Number	Manufacturer	I/O Count	Interface	Clock Frequency	Voltage Supply	Output Type	Current Source/Sink	Temperature Range	Package	Product Status
PCA9554APW	Texas Instruments	8	I2C, SMBus	400 kHz	2.3V ~ 5.5V	Push-Pull	10mA, 25mA	-40°C ~ 85°C	16-TSSOP	Last Time Buy
TCA9554APWR	Texas Instruments	8	I2C, SMBus	400 kHz	1.65V ~ 5.5V	Push-Pull	10mA, 25mA	-40°C ~ 85°C	16-TSSOP	Active
PCA9554APW,118	NXP Semiconductors	8	I2C, SMBus	400 kHz	2.3V ~ 5.5V	Push-Pull	10mA, 25mA	-40°C ~ 85°C	16-TSSOP	Active
PCA9554PW,112	NXP USA Inc.	8	I2C, SMBus	400 kHz	2.3V ~ 5.5V	Push-Pull	10mA, 25mA	-40°C ~ 85°C	16-TSSOP	Active
PCA9554PW,118	NXP USA Inc.	8	I2C, SMBus	400 kHz	2.3V ~ 5.5V	Push-Pull	10mA, 25mA	-40°C ~ 85°C	16-TSSOP	Active
PCA8574APW,118	NXP USA Inc.	8	I2C	400 kHz	2.3V ~ 5.5V	Push-Pull	100µA, 25mA	-40°C ~ 85°C	16-TSSOP	Active
PCA9554BPWJ	NXP USA Inc.	8	I2C, SMBus	400 kHz	1.65V ~ 5.5V	Push-Pull	10mA, 25mA	-40°C ~ 85°C	16-TSSOP	Active
PCA9554CPWJ	NXP USA Inc.	8	I2C, SMBus	400 kHz	1.65V ~ 5.5V	Push-Pull	10mA, 25mA	-40°C ~ 85°C	16-TSSOP	Active
PCAL9554BPWJ	NXP USA Inc.	8	I2C, SMBus	400 kHz	1.65V ~ 5.5V	Open Drain, Push-Pull	10mA, 25mA	-40°C ~ 85°C	16-TSSOP	Active
PI4IOE5V9554ALEX	Diodes Incorporated	8	I2C	400 kHz	2.3V ~ 5.5V	-	-	-40°C ~ 85°C	16-TSSOP	Active
PCA9654EDTR2G	onsemi	8	I2C	100 kHz	1.65V ~ 5.5V	-	-	-55°C ~ 125°C	16-TSSOP	Obsolete

Engineering Selection Recommendations

Recommended Primary Substitutes:

TCA9554APWR from Texas Instruments is the preferred substitute. It maintains the same manufacturer as the original part, operates at 400 kHz with I2C and SMBus support, and extends the minimum supply voltage to 1.65V. Product status is Active with full RoHS3 compliance and unlimited moisture sensitivity rating.

PCA9554APW,118 and PCA9554PW,118 from NXP USA Inc. are direct functional equivalents with identical electrical specifications to the original part. Both are Active status with full compliance certifications and adequate inventory availability.

Secondary Substitutes:

PCA9554BPWJ and PCA9554CPWJ from NXP USA Inc. provide equivalent functionality with extended lower voltage support (1.65V minimum). Both are Active status with full compliance.

PCAL9554BPWJ from NXP USA Inc. (Agile series) offers dual output type capability (Open Drain and Push-Pull) with extended voltage range and Active product status.

Limited Compatibility:

PCA8574APW,118 operates with reduced source current (100µA vs. 10mA) and lacks SMBus interface support, limiting compatibility to I2C-only applications.

PI4IOE5V9554ALEX from Diodes Incorporated lacks documented output type and current specifications, requiring detailed datasheet verification for specific application requirements.

PCA9654EDTR2G from onsemi operates at 100 kHz clock frequency and is marked Obsolete, making it unsuitable for new designs requiring 400 kHz performance.

Frequently Asked Questions (FAQ)

Q: Can PCA9554APW be directly replaced with TCA9554APWR?

A: Yes. Both devices provide 8-bit I/O expansion with I2C and SMBus interface at 400 kHz, identical output type and current capability, and compatible temperature range. TCA9554APWR extends the minimum supply voltage to 1.65V, making it suitable for lower voltage applications. Both use 16-TSSOP packaging with identical pinout compatibility.

Q: What is the difference between PCA9554PW,112 and PCA9554PW,118?

A: Both are NXP USA Inc. PCA9554 variants with identical electrical specifications. The suffix designates packaging format: ,112 indicates Tube packaging while ,118 indicates Cut Tape and Digi-Reel packaging. Electrical performance and pinout are identical.

Q: Why is PCA9654EDTR2G listed as a substitute if it operates at 100 kHz?

A: PCA9654EDTR2G is included in the substitute list based on the provided input data, but operates at 100 kHz instead of the required 400 kHz. This part is marked Obsolete and is not recommended for new designs requiring full 400 kHz I2C performance.

Q: Can PCAL9554BPWJ replace PCA9554APW in all applications?

A: PCAL9554BPWJ provides equivalent I/O expansion functionality with identical 400 kHz clock frequency and I2C/SMBus support. The key difference is dual output type capability (Open Drain and Push-Pull) and extended lower voltage support (1.65V minimum). Verify application requirements for output type compatibility before substitution.

Q: What is the impact of using PI4IOE5V9554ALEX as a substitute?

A: PI4IOE5V9554ALEX from Diodes Incorporated provides 8-bit I/O expansion at 400 kHz with I2C interface in 16-TSSOP packaging. However, output type and current specifications are not documented in the provided data. Detailed datasheet review is required to confirm compatibility with specific application current requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification and unlimited moisture sensitivity rating (MSL 1), matching the original PCA9554APW compliance status.

Q: Which substitute offers the widest voltage operating range?

A: TCA9554APWR, PCA9554BPWJ, PCA9554CPWJ, PCAL9554BPWJ, and PCA9654EDTR2G all support 1.65V minimum supply voltage compared to the original part's 2.3V minimum. For applications requiring extended lower voltage operation, these parts provide the widest supply range.

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