PCA8574APW,118 Equivalent & Substitute Parts

Part Overview

The PCA8574APW,118 is an 8-bit I/O Expander with I2C interface operating at 400 kHz, manufactured by NXP USA Inc. in a 16-TSSOP surface mount package. This device provides general-purpose input/output expansion for microcontroller-based systems requiring additional I/O lines with I2C communication capability. The part is currently in active production status with 2,613 units in stock. Equivalent and substitute parts are necessary when the original part is unavailable, when alternative packaging is required for design optimization, or when extended operating temperature ranges or enhanced electrical specifications are needed for specific applications.

Key Parameters

Parameter	Value
Number of I/O	8
Interface	I2C
Clock Frequency	400 kHz
Voltage Supply Range	2.3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	16-TSSOP
Interrupt Output	Yes
Output Type	Push-Pull
Current Output Source/Sink	100µA, 25mA
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the PCA8574APW,118 is determined by the following critical parameters: 8-bit I/O count, I2C interface protocol, 400 kHz clock frequency operation, supply voltage compatibility within 2.3V to 5.5V range, push-pull output configuration, and interrupt output capability. Substitute parts are grouped into three categories based on package type and electrical specifications:

Category 1: Same Package (16-TSSOP) with Equivalent Specifications Parts maintaining the 16-TSSOP package format with 400 kHz I2C operation and compatible voltage ranges allow direct board-level substitution without layout modification.

Category 2: Alternative Packages (16-SOIC, 16-UQFN) with Equivalent Specifications Parts with different surface mount packages but identical electrical functionality require PCB layout redesign but maintain full functional compatibility.

Category 3: Enhanced Specifications (24-pin packages) Parts offering extended temperature ranges, lower minimum supply voltage, or additional features in larger packages provide enhanced capability for demanding applications.

Parameter Comparison

Part Number	Manufacturer	I/O Count	Interface	Clock Frequency	Supply Voltage	Operating Temperature	Package	Interrupt Output	Output Type	Product Status
PCA8574APW,118	NXP USA Inc.	8	I2C	400 kHz	2.3V ~ 5.5V	-40°C ~ 85°C	16-TSSOP	Yes	Push-Pull	Active
TCA9534PWR	Texas Instruments	8	I2C	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	16-TSSOP	Yes	Push-Pull	Active
PI4IOE5V9554LE	Diodes Incorporated	8	I2C	400 kHz	2.3V ~ 5.5V	-40°C ~ 85°C	16-TSSOP	Yes	-	Active
TCA9534DWT	Texas Instruments	8	I2C	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	16-SOIC	Yes	Push-Pull	Active
TCA9534ADWT	Texas Instruments	8	I2C	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	16-SOIC	Yes	Push-Pull	Active
TCA9534ADWR	Texas Instruments	8	I2C	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	16-SOIC	Yes	Push-Pull	Active
TCA6408ARSVR	Texas Instruments	8	I2C, SMBus	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	16-UQFN	Yes	Push-Pull	Active
PCA9654EDTR2G	onsemi	8	I2C	100 kHz	1.65V ~ 5.5V	-55°C ~ 125°C	16-TSSOP	Yes	-	Obsolete
MAX7324AEG+	Analog Devices Inc./Maxim Integrated	8	I2C	400 kHz	1.71V ~ 5.5V	-40°C ~ 125°C	24-QSOP	Yes	Push-Pull	Active
MAX7324ATG+	Analog Devices Inc./Maxim Integrated	8	I2C	400 kHz	1.71V ~ 5.5V	-40°C ~ 125°C	24-TQFN	Yes	Push-Pull	Active
MAX7324ATG+T	Analog Devices Inc./Maxim Integrated	8	I2C	400 kHz	1.71V ~ 5.5V	-40°C ~ 125°C	24-TQFN	Yes	Push-Pull	Active

Engineering Selection Recommendations

Direct Substitutes (Same Package, 16-TSSOP)

TCA9534PWR from Texas Instruments is the primary direct substitute, offering identical 16-TSSOP packaging with 400 kHz I2C operation. This part extends the minimum supply voltage to 1.65V, providing enhanced low-voltage capability while maintaining the same operating temperature range. With 165,200 units in stock, availability is superior to the original part.

PI4IOE5V9554LE from Diodes Incorporated maintains the original supply voltage range (2.3V ~ 5.5V) and 16-TSSOP package, offering a functionally equivalent alternative with 10,994 units available.

Alternative Package Substitutes (16-SOIC)

TCA9534DWT, TCA9534ADWT, and TCA9534ADWR from Texas Instruments provide 400 kHz I2C operation in 16-SOIC packaging. These parts require PCB layout modification but offer extended supply voltage range (1.65V ~ 5.5V). TCA9534DWT has the highest inventory at 45,300 units.

Compact Package Substitute (16-UQFN)

TCA6408ARSVR from Texas Instruments combines I2C and SMBus protocol support in a compact 16-UQFN package (2.6x1.8mm), enabling space-constrained designs. This part supports both I2C and SMBus protocols with 35,300 units in stock and extended supply voltage range (1.65V ~ 5.5V).

Enhanced Specification Alternatives (24-pin Packages)

MAX7324AEG+, MAX7324ATG+, and MAX7324ATG+T from Analog Devices Inc./Maxim Integrated offer extended operating temperature range (-40°C ~ 125°C) compared to the original part's -40°C ~ 85°C specification. These parts are suitable for industrial and automotive applications requiring wider temperature operation. The 24-pin packages provide additional functionality or integration options.

Obsolete Part Note

PCA9654EDTR2G from onsemi is marked as obsolete and operates at 100 kHz clock frequency, which is below the 400 kHz specification of the original part. This part is not recommended for new designs.

Frequently Asked Questions (FAQ)

Q: Can TCA9534PWR be used as a direct replacement for PCA8574APW,118 without any design changes?

A: Yes. TCA9534PWR maintains the identical 16-TSSOP package, 400 kHz I2C clock frequency, 8-bit I/O configuration, and interrupt output capability. The extended minimum supply voltage (1.65V vs. 2.3V) is backward compatible. No PCB layout modifications are required.

Q: What is the primary difference between the 16-TSSOP and 16-SOIC package options?

A: Package footprint and board space requirements differ. 16-TSSOP (0.173" width, 4.40mm) is narrower than 16-SOIC (0.295" width, 7.50mm). Selecting 16-SOIC requires PCB redesign but may offer improved thermal characteristics in some applications. Both packages maintain identical electrical functionality.

Q: Why would I choose a 24-pin package substitute like MAX7324ATG+ over the 16-pin alternatives?

A: The MAX7324 series offers extended operating temperature range (-40°C ~ 125°C) suitable for industrial, automotive, and harsh environment applications. The wider temperature specification comes at the cost of larger package size and potential design layout changes. Select this option only if your application requires the extended temperature range.

Q: Is the PCA9654EDTR2G a suitable substitute?

A: No. Although PCA9654EDTR2G maintains the 16-TSSOP package and 8-bit I/O configuration, it operates at 100 kHz clock frequency, which is below the 400 kHz specification of the original part. Additionally, this part is marked as obsolete. It is not recommended for new designs or as a substitute.

Q: Can I use TCA6408ARSVR in applications requiring only I2C protocol?

A: Yes. TCA6408ARSVR supports both I2C and SMBus protocols, making it fully compatible with I2C-only applications. The SMBus capability is a superset of I2C functionality. The 16-UQFN package is significantly smaller than 16-TSSOP, requiring PCB layout redesign for space-constrained applications.

Q: What supply voltage range should I verify when selecting a substitute?

A: The original PCA8574APW,118 operates from 2.3V to 5.5V. Most substitutes extend the minimum voltage to 1.65V or 1.71V, which is backward compatible. Verify that your application's supply voltage falls within the selected substitute's specified range. The MAX7324 series specifies 1.71V minimum, while TCA9534 variants specify 1.65V minimum.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, matching the compliance status of the original PCA8574APW,118.

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