PCA8574PW,112 Equivalent & Substitute Parts

Part Overview

The PCA8574PW,112 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 component is classified as Obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The part provides 8 I/O lines with push-pull output capability, interrupt output, and power-on reset (POR) functionality, suitable for applications requiring I2C-based port expansion with supply voltage range of 2.3V to 5.5V and operating temperature range of -40°C to 85°C.

Key Parameters

Parameter	Value
Manufacturer Part Number	PCA8574PW,112
Manufacturer	NXP USA Inc.
Category	Interface
Number of I/O	8
Interface	I2C
Clock Frequency	400 kHz
Voltage - Supply	2.3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	16-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Output Type	Push-Pull
Interrupt Output	Yes
Features	POR
Current - Output Source/Sink	100µA, 25mA
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the PCA8574PW,112 are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Number of I/O: Must be 8 (all substitutes maintain this requirement)
Interface: Must be I2C (all substitutes use I2C protocol)
Clock Frequency: 400 kHz operation (primary criterion; one substitute operates at 100 kHz)
Package Compatibility: 16-TSSOP package preferred for direct pin-compatible replacement; alternative packages acceptable for new designs
Voltage Supply Range: Must support minimum 2.3V operation
Operating Temperature: Must support -40°C to 85°C minimum range
Output Type: Push-Pull configuration
Interrupt Output: Must be present
RoHS Compliance: ROHS3 Compliant

Substitutes are grouped into two categories: direct package replacements (16-TSSOP) and functional equivalents with alternative packages (SOIC, QSOP, TQFN, VQFN).

Parameter Comparison

Part Number	Manufacturer	I/O Count	Interface	Clock Frequency	Package	Voltage Supply	Temp Range	Output Type	Interrupt	Status
PCA8574PW,112	NXP USA Inc.	8	I2C	400 kHz	16-TSSOP	2.3V ~ 5.5V	-40°C ~ 85°C	Push-Pull	Yes	Obsolete
PI4IOE5V9554LEX	Diodes Incorporated	8	I2C	400 kHz	16-TSSOP	2.3V ~ 5.5V	-40°C ~ 85°C	-	Yes	Active
PI4IOE5V9554ALEX	Diodes Incorporated	8	I2C	400 kHz	16-TSSOP	2.3V ~ 5.5V	-40°C ~ 85°C	-	Yes	Active
TCA9534DWT	Texas Instruments	8	I2C	400 kHz	16-SOIC	1.65V ~ 5.5V	-40°C ~ 85°C	Push-Pull	Yes	Active
TCA9534DWR	Texas Instruments	8	I2C	400 kHz	16-SOIC	1.65V ~ 5.5V	-40°C ~ 85°C	Push-Pull	Yes	Active
TCA6408ARGTR	Texas Instruments	8	I2C, SMBus	400 kHz	16-VQFN (3x3)	1.65V ~ 5.5V	-40°C ~ 85°C	Push-Pull	Yes	Active
MAX7324AEG+T	Analog Devices Inc./Maxim Integrated	8	I2C	400 kHz	24-QSOP	1.71V ~ 5.5V	-40°C ~ 125°C	Push-Pull	Yes	Active
MAX7324ATG+T	Analog Devices Inc./Maxim Integrated	8	I2C	400 kHz	24-TQFN (4x4)	1.71V ~ 5.5V	-40°C ~ 125°C	Push-Pull	Yes	Active
PCA9654EDTR2G	onsemi	8	I2C	100 kHz	16-TSSOP	1.65V ~ 5.5V	-55°C ~ 125°C	-	Yes	Obsolete

Engineering Selection Recommendations

Direct Package Replacement (16-TSSOP):

PI4IOE5V9554LEX and PI4IOE5V9554ALEX from Diodes Incorporated are the primary substitutes for direct 16-TSSOP package replacement. Both maintain identical electrical specifications (400 kHz I2C, 2.3V to 5.5V supply, -40°C to 85°C operating range) and pinout compatibility. PI4IOE5V9554LEX is available in Tape & Reel packaging with significantly higher inventory (142,600 pcs), making it the preferred choice for production volumes. Both parts are Active status with ROHS3 compliance.

Alternative Package Options (Active Status):

For new designs where package flexibility exists, the following Active status alternatives provide enhanced specifications:

TCA9534DWT / TCA9534DWR (Texas Instruments, 16-SOIC): Maintain 400 kHz I2C operation with extended supply range (1.65V minimum) and identical temperature range. SOIC package offers different thermal and layout characteristics.
TCA6408ARGTR (Texas Instruments, 16-VQFN): Adds SMBus compatibility alongside I2C, operates at 400 kHz with 1.65V to 5.5V supply range. VQFN package (3x3) provides smaller footprint.
MAX7324 Series (Analog Devices Inc./Maxim Integrated): Available in 24-QSOP and 24-TQFN packages with extended operating temperature (-40°C to 125°C) and lower minimum supply voltage (1.71V). These parts offer superior thermal performance and wider temperature range.

Obsolete Status Consideration:

PCA9654EDTR2G (onsemi, 16-TSSOP) shares package compatibility but operates at reduced clock frequency (100 kHz) and carries Obsolete status, making it unsuitable for new designs despite extended temperature range.

Frequently Asked Questions (FAQ)

Q: Can PI4IOE5V9554LEX directly replace PCA8574PW,112 without PCB modifications?

A: Yes. Both parts use 16-TSSOP package with identical pinout, 400 kHz I2C operation, 2.3V to 5.5V supply range, and -40°C to 85°C operating temperature. No PCB layout changes are required.

Q: What is the key difference between PI4IOE5V9554LEX and PI4IOE5V9554ALEX?

A: Both are functionally identical with 16-TSSOP package and 400 kHz I2C operation. The primary difference is packaging format: LEX is supplied in Tape & Reel (TR) with 142,600 pcs inventory, while ALEX is supplied in Cut Tape (CT) & Digi-Reel with 11,489 pcs inventory. LEX is recommended for production quantities.

Q: Why do TCA9534DWT and TCA9534DWR use 16-SOIC instead of 16-TSSOP?

A: Both are functionally equivalent I2C expanders at 400 kHz but use different package technologies. SOIC (0.295" width) offers different thermal characteristics and board layout spacing compared to TSSOP (0.173" width). SOIC packages are suitable for new designs where package footprint flexibility exists.

Q: Can MAX7324 series parts substitute for PCA8574PW,112 in existing designs?

A: MAX7324 parts provide functional I2C expansion at 400 kHz with superior specifications (1.71V to 5.5V supply, -40°C to 125°C temperature range). However, they use 24-pin packages (QSOP or TQFN) versus the original 16-TSSOP, requiring PCB redesign. These are suitable for new designs requiring extended temperature or lower voltage operation.

Q: Is PCA9654EDTR2G a viable substitute?

A: No. Although PCA9654EDTR2G maintains 16-TSSOP package compatibility, it operates at 100 kHz clock frequency versus the required 400 kHz, and carries Obsolete status. This part is unsuitable for applications requiring 400 kHz I2C operation.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts listed are ROHS3 Compliant and REACH Unaffected, matching the original PCA8574PW,112 compliance status. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts except TCA6408ARGTR, which is MSL 2 (1 Year).

Q: Which substitute offers the best inventory availability?

A: PI4IOE5V9554LEX from Diodes Incorporated has the highest inventory at 142,600 pcs in Tape & Reel format, providing immediate availability for production requirements while maintaining full electrical and package compatibility with the original part.

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