PCA8574TS,112 Equivalent & Substitute Parts

Part Overview

The PCA8574TS,112 is an 8-bit I/O Expander interface circuit manufactured by NXP Semiconductors, designed for I2C communication at 400 kHz with push-pull output configuration. This component operates across a supply voltage range of 2.3V to 5.5V and supports operating temperatures from -40°C to 85°C. The device features Power-On Reset (POR) functionality and interrupt output capability.

The PCA8574TS,112 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and system upgrades.

Key Parameters

Parameter	Value
Manufacturer Part Number	PCA8574TS,112
Manufacturer	NXP Semiconductors
Category	Interface
Number of I/O	8
Interface Type	I2C
Clock Frequency	400 kHz
Voltage Supply Range	2.3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Output Type	Push-Pull
Interrupt Output	Yes
Features	POR
Mounting Type	Surface Mount
Package / Case	20-LSSOP (0.173", 4.40mm Width)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the PCA8574TS,112 is determined by the following critical parameters:

Number of I/O: Must be 8 bits
Interface Type: Must support I2C protocol
Clock Frequency: Must operate at 400 kHz
Output Type: Must be push-pull configuration
Interrupt Output: Must be present
Voltage Supply Range: Must encompass or be compatible with 2.3V ~ 5.5V
Operating Temperature: Must support -40°C ~ 85°C minimum
Mounting Type: Surface mount only
RoHS Compliance: ROHS3 compliant

Substitute parts are grouped into two categories based on package compatibility and electrical performance:

Category 1 - Direct Package Compatibility (20-LSSOP): PCF8574TS/3,118 maintains the same 20-LSSOP package footprint, enabling direct PCB layout compatibility with reduced design modification.

Category 2 - Functional Equivalence with Alternative Packages: MAX7324 series (24-QSOP, 24-TQFN) and TCA series (16-TSSOP, 16-UQFN, 16-SOIC) provide functional I/O expansion capability with different package geometries, requiring PCB layout redesign but offering enhanced performance characteristics or improved availability.

Parameter Comparison

Parameter	PCA8574TS,112	PCF8574TS/3,118	MAX7324AEG+	MAX7324ATG+	MAX7324ATG+T	TCA6408APWR	TCA6408ARSVR	TCA9534ADWR	TCA9534ADWT	TCA9534DWR	TCA9534DWT
Manufacturer	NXP Semiconductors	NXP USA Inc.	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Number of I/O	8	8	8	8	8	8	8	8	8	8	8
Interface Type	I2C	I2C	I2C	I2C	I2C	I2C, SMBus	I2C, SMBus	I2C	I2C	I2C	I2C
Clock Frequency	400 kHz	100 kHz	400 kHz	400 kHz	400 kHz	400 kHz	400 kHz	400 kHz	400 kHz	400 kHz	400 kHz
Voltage Supply Range	2.3V ~ 5.5V	2.5V ~ 6V	1.71V ~ 5.5V	1.71V ~ 5.5V	1.71V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Output Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Interrupt Output	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-LSSOP	20-LSSOP	24-SSOP	24-WFQFN Exposed Pad	24-WFQFN Exposed Pad	16-TSSOP	16-UFQFN	16-SOIC	16-SOIC	16-SOIC	16-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain ROHS3 compliance and active product status, ensuring long-term availability and regulatory conformance for production environments.

PCF8574TS/3,118 is the primary substitute for direct replacement applications. It shares the identical 20-LSSOP package footprint with the PCA8574TS,112, eliminating PCB layout modifications. The PCF8574TS/3,118 operates at 100 kHz clock frequency compared to the original 400 kHz specification; however, this reduced speed remains compatible with standard I2C bus protocols and does not impact functional I/O expansion capability in most applications. Supply voltage range (2.5V ~ 6V) encompasses the original specification.

MAX7324 series (MAX7324AEG+, MAX7324ATG+, MAX7324ATG+T) offers enhanced operating temperature range (-40°C ~ 125°C) and lower minimum supply voltage (1.71V). These devices require package redesign due to 24-pin configurations (24-SSOP or 24-TQFN) versus the original 20-pin format. MAX7324ATG+T is supplied in tape and reel packaging for high-volume production.

TCA6408 series (TCA6408APWR, TCA6408ARSVR) provides SMBus compatibility alongside I2C protocol support, enabling broader system integration. The 16-pin package (16-TSSOP or 16-UQFN) requires PCB layout redesign. TCA6408ARSVR offers compact 16-UQFN geometry for space-constrained applications.

TCA9534 series (TCA9534ADWR, TCA9534ADWT, TCA9534DWR, TCA9534DWT) maintains 400 kHz clock frequency matching the original specification. The 16-SOIC package provides standard through-hole compatibility options. TCA9534DWR and TCA9534DWT variants offer highest inventory availability (65,780 and 45,300 units respectively) for immediate procurement.

Frequently Asked Questions (FAQ)

Q: Can PCF8574TS/3,118 directly replace PCA8574TS,112 on existing PCBs?

A: Yes. Both devices use identical 20-LSSOP package geometry and pinout. The PCF8574TS/3,118 operates at 100 kHz instead of 400 kHz; this reduced clock frequency is compatible with I2C bus specifications and does not affect I/O expansion functionality in standard applications.

Q: What are the key differences between MAX7324 and TCA9534 substitutes?

A: MAX7324 series provides extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C) and lower minimum supply voltage (1.71V versus 1.65V). Both maintain 400 kHz clock frequency. Package geometry differs: MAX7324 uses 24-pin configurations while TCA9534 uses 16-SOIC. Selection depends on thermal requirements and available PCB space.

Q: Does TCA6408 SMBus compatibility affect I2C protocol operation?

A: No. SMBus is a subset of I2C protocol. TCA6408 devices operate fully compatible with standard I2C bus implementations while providing additional SMBus feature support for systems requiring both protocols.

Q: Which substitute offers the smallest package footprint?

A: TCA6408ARSVR in 16-UQFN (2.6x1.8mm) package provides the most compact geometry. MAX7324ATG+ in 24-TQFN (4x4mm) offers reduced footprint compared to larger SOIC packages while maintaining higher pin count.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and are classified as active products, ensuring regulatory conformance and long-term manufacturing availability.

Q: What packaging options are available for high-volume production?

A: TCA9534DWR (65,780 units) and TCA9534DWT (45,300 units) offer highest inventory levels in cut tape and tape & reel formats. MAX7324ATG+T provides tape & reel packaging for automated assembly. TCA6408APWR and TCA6408ARSVR support cut tape and Digi-Reel formats.

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