PCA6107DW Equivalent & Substitute Parts

Part Overview

The PCA6107DW is an 8-bit I/O Expander interface component manufactured by Texas Instruments, designed for I2C and SMBus communication at 400 kHz. The device is packaged in an 18-SOIC form factor and operates across a supply voltage range of 2.3V to 5.5V with an operating temperature range of -40°C to 85°C. The PCA6107DW is classified as obsolete, making identification of functionally equivalent substitute components necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	PCA6107DW
Manufacturer	Texas Instruments
Category	Interface
Number of I/O	8
Interface Protocol	I2C, SMBus
Clock Frequency	400 kHz
Voltage Supply Range	2.3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	18-SOIC (0.295", 7.50mm Width)
Output Type	Open Drain, Push-Pull
Interrupt Output	Yes
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the PCA6107DW is determined by the following core electrical and mechanical parameters:

Critical Matching Parameters:

Number of I/O: 8 channels (all substitutes maintain this specification)
Interface Protocol: I2C at 400 kHz (all substitutes support I2C 400 kHz operation)
Interrupt Output: Yes (all substitutes include interrupt capability)
RoHS Compliance: ROHS3 (all substitutes maintain compliance)
Operating Temperature: -40°C minimum and 85°C or higher maximum
Voltage Supply Range: Minimum 2.3V or lower; maximum 5.5V or higher

Package Consideration: The PCA6107DW uses an 18-SOIC package. Substitute parts employ different package types (16-SSOP, 16-QSOP, 16-TQFN), requiring PCB layout redesign. Package selection depends on available board space and manufacturing capabilities.

All substitute parts listed meet or exceed the electrical specifications of the PCA6107DW while offering active product status and improved availability.

Parameter Comparison

Parameter	PCA6107DW	TCA9538DBR	MAX7321AEE+	MAX7321ATE+	MAX7321ATE+T
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Number of I/O	8	8	8	8	8
Interface	I2C, SMBus	I2C	I2C	I2C	I2C
Clock Frequency	400 kHz	400 kHz	400 kHz	400 kHz	400 kHz
Voltage Supply Range	2.3V ~ 5.5V	1.65V ~ 5.5V	1.71V ~ 5.5V	1.71V ~ 5.5V	1.71V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Output Type	Open Drain, Push-Pull	Push-Pull	Open Drain, Push-Pull	Open Drain, Push-Pull	Open Drain, Push-Pull
Interrupt Output	Yes	Yes	Yes	Yes	Yes
Package Type	18-SOIC	16-SSOP	16-QSOP	16-TQFN (3x3)	16-TQFN (3x3)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

TCA9538DBR is the direct Texas Instruments substitute, maintaining the same manufacturer ecosystem. This part operates at the same temperature range (-40°C to 85°C) as the PCA6107DW and provides equivalent electrical performance. The 16-SSOP package offers a compact footprint suitable for space-constrained applications. Active product status ensures long-term availability and supply chain stability.

MAX7321AEE+, MAX7321ATE+, and MAX7321ATE+T are Analog Devices/Maxim Integrated alternatives offering extended operating temperature range (-40°C to 125°C), providing thermal margin for high-temperature environments. All three variants maintain identical electrical specifications with differences limited to packaging and delivery format. The MAX7321 series supports both open-drain and push-pull output configurations, matching the PCA6107DW output flexibility. Active product status and ROHS3 compliance ensure regulatory compliance and procurement reliability.

Selection between substitute options depends on package availability, PCB layout constraints, and thermal requirements. All listed substitutes meet the core functional and compliance requirements of the PCA6107DW.

Frequently Asked Questions (FAQ)

Q: Can the TCA9538DBR directly replace the PCA6107DW without firmware changes?

A: The TCA9538DBR maintains I2C 400 kHz protocol compatibility and 8-bit I/O functionality. However, the package change from 18-SOIC to 16-SSOP requires PCB layout modification. Verify I2C address configuration and interrupt pin mapping in your application schematic before implementation.

Q: What is the primary difference between the MAX7321 variants?

A: MAX7321AEE+, MAX7321ATE+, and MAX7321ATE+T are electrically identical. Differences are packaging format (16-QSOP versus 16-TQFN) and delivery method (Tube versus Cut Tape & Digi-Reel). Select based on your assembly process and available board space.

Q: Does the TCA9538DBR support SMBus protocol like the PCA6107DW?

A: The TCA9538DBR supports I2C protocol at 400 kHz. SMBus compatibility depends on your system implementation. Verify SMBus-specific requirements in your application before selecting this substitute.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (TCA9538DBR, MAX7321AEE+, MAX7321ATE+, MAX7321ATE+T) are ROHS3 compliant, matching the compliance status of the PCA6107DW.

Q: Which substitute offers the widest operating temperature range?

A: The MAX7321 series (MAX7321AEE+, MAX7321ATE+, MAX7321ATE+T) operates from -40°C to 125°C, providing 40°C additional thermal margin compared to the PCA6107DW and TCA9538DBR, which operate to 85°C.

Q: Can I use the MAX7321 variants in applications requiring the full 2.3V minimum supply voltage?

A: The MAX7321 series minimum supply voltage is 1.71V, which is lower than the PCA6107DW specification of 2.3V. This provides additional voltage margin for low-power applications. Verify your system's minimum supply voltage requirement before selection.

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