PCA9535DW Equivalent & Substitute Parts

Part Overview

The PCA9535DW is a 16-bit I/O expander from Texas Instruments designed for I2C and SMBus communication at 400 kHz. This interface IC operates across a 2.3V to 5.5V supply range and is housed in a 24-SOIC package. The device is currently in Last Time Buy status, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

PCA9535DW

Texas InstrumentsIn Stock: 3220PCA9535DW Datasheet

Current PartRFQ

TCA9535PWR

Texas InstrumentsIn Stock: 5506TCA9535PWR Datasheet

MFR RecommendedRFQ

MAX7311AWG+

Analog Devices Inc./Maxim IntegratedIn Stock: 29967MAX7311AWG+ Datasheet

MFR RecommendedRFQ

MAX7311AWG+T

Analog Devices Inc./Maxim IntegratedIn Stock: 862MAX7311AWG+T Datasheet

MFR RecommendedRFQ

MAX7312AWG+

Analog Devices Inc./Maxim IntegratedIn Stock: 852MAX7312AWG+ Datasheet

MFR RecommendedRFQ

MAX7318AWG+

Analog Devices Inc./Maxim IntegratedIn Stock: 2784MAX7318AWG+ Datasheet

MFR RecommendedRFQ

PCA9535D,112

NXP USA Inc.In Stock: 2301PCA9535D,112 Datasheet

MFR RecommendedRFQ

PCA9555D,112

NXP USA Inc.In Stock: 2368PCA9555D,112 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the PCA9535DW is determined by the following critical parameters:

• I/O Count: 16-bit configuration
• Interface Protocol: I2C and SMBus compatibility at 400 kHz
• Supply Voltage Range: Minimum 2.3V support required
• Operating Temperature Range: -40°C to 85°C minimum
• Output Characteristics: Push-Pull output type with specified current ratings
• Package Compatibility: 24-SOIC form factor for direct PCB replacement
• Interrupt Capability: Interrupt output support
• Power-On Reset: POR feature presence

Substitute parts are grouped into two categories based on package type: 24-SOIC direct replacements and 24-TSSOP alternatives. All substitutes maintain core I2C/SMBus functionality and 16-bit I/O configuration. Parts from Analog Devices (MAX7311, MAX7312, MAX7318 series) offer enhanced current output capabilities (31mA, 43mA) and extended temperature range (-40°C to 125°C). NXP alternatives (PCA9535D,112 and PCA9555D,112) maintain identical electrical specifications to the original part.

Parameter Comparison

Engineering Selection Recommendations

Direct Package Replacement (24-SOIC): PCA9535D,112, PCA9555D,112, MAX7311AWG+, MAX7311AWG+T, MAX7312AWG+, and MAX7318AWG+ are all available in 24-SOIC packaging and provide direct PCB compatibility with the PCA9535DW. These parts maintain identical pinout and form factor.

Electrical Equivalence: PCA9535D,112 and PCA9555D,112 from NXP maintain identical electrical specifications to the original part, including supply voltage range (2.3V ~ 5.5V), operating temperature (-40°C ~ 85°C), and output current ratings (10mA, 25mA).

Enhanced Performance Alternatives: MAX7311AWG+, MAX7311AWG+T, MAX7312AWG+, and MAX7318AWG+ from Analog Devices offer higher output current capability (31mA, 43mA) and extended operating temperature range (-40°C ~ 125°C), suitable for applications requiring greater thermal margin or higher drive capability.

Alternative Package Option: TCA9535PWR from Texas Instruments provides functional equivalence in 24-TSSOP packaging. This option requires PCB layout modification but maintains identical electrical performance and supply voltage range. The TSSOP package offers reduced board footprint.

All substitute parts carry ROHS3 compliance and active product status, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can MAX7311AWG+ directly replace PCA9535DW on the PCB? A: Yes. Both parts use 24-SOIC packaging with identical pinout and form factor. The MAX7311AWG+ is a direct physical replacement. However, the higher output current capability (31mA vs 10mA source, 43mA vs 25mA sink) means the substitute can drive heavier loads.

Q: What is the key difference between PCA9535D,112 and MAX7311AWG+? A: PCA9535D,112 maintains identical electrical specifications to PCA9535DW (2.3V ~ 5.5V supply, -40°C ~ 85°C operation, 10mA/25mA output). MAX7311AWG+ offers enhanced current output (31mA/43mA) and extended temperature range (-40°C ~ 125°C). Both are 24-SOIC packages.

Q: Is TCA9535PWR compatible with existing PCB layouts? A: TCA9535PWR uses 24-TSSOP packaging instead of 24-SOIC, requiring PCB footprint modification. It is not a drop-in replacement but provides functional equivalence with identical electrical specifications and reduced board space.

Q: Do all substitutes support I2C and SMBus at 400 kHz? A: Yes. All listed substitutes maintain 16-bit I/O configuration, I2C/SMBus interface, and 400 kHz clock frequency. They are functionally compatible at the protocol level.

Q: Which substitute offers the best thermal performance? A: MAX7311AWG+, MAX7311AWG+T, MAX7312AWG+, and MAX7318AWG+ support extended operating temperature range (-40°C ~ 125°C) compared to the original part (-40°C ~ 85°C), providing 40°C additional thermal margin.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting environmental and regulatory requirements equivalent to the original PCA9535DW.

Q: What is the inventory status of these substitutes? A: All substitutes are in active product status with current inventory availability. PCA9535DW is Last Time Buy, making these alternatives necessary for production continuity.