PCA9535EMTTXG I/O Expander Equivalent & Substitute Parts

Part Overview

The PCA9535EMTTXG is a 16-bit I/O expander with I2C and SMBus interface operating at 100 kHz, manufactured by onsemi in a 24-QFN package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility while meeting current availability and compliance standards.

Substiute Parts

PCA9535EMTTXG

onsemiIn Stock: 3224PCA9535EMTTXG Datasheet

Current PartRFQ

MAX7311ATG+

Analog Devices Inc./Maxim IntegratedIn Stock: 17419MAX7311ATG+ Datasheet

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MAX7311ATG+T

Analog Devices Inc./Maxim IntegratedIn Stock: 3984MAX7311ATG+T Datasheet

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MAX7318ATG+

Analog Devices Inc./Maxim IntegratedIn Stock: 3161MAX7318ATG+ Datasheet

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PCA9535CHF,118

NXP USA Inc.In Stock: 1585PCA9535CHF,118 Datasheet

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TCA9535RTWR

Texas InstrumentsIn Stock: 2250TCA9535RTWR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9535EMTTXG is determined by the following critical parameters:

• 16-bit I/O configuration
• I2C and SMBus protocol support
• Push-Pull output type
• 10mA/25mA output current capability
• 24-pin QFN package footprint compatibility
• ROHS3 compliance and MSL rating

Substitute parts are grouped into two categories based on clock frequency capability:

Category 1: 400 kHz Clock Frequency Substitutes – Parts with enhanced I2C/SMBus speed (MAX7311ATG+, MAX7311ATG+T, MAX7318ATG+, TCA9535RTWR) provide higher performance while maintaining backward compatibility with 100 kHz operation.

Category 2: Alternative Output Type – PCA9535CHF,118 features open-drain output instead of push-pull, requiring circuit design verification for compatibility.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Preferred):

MAX7311ATG+T and TCA9535RTWR are the primary substitutes for the PCA9535EMTTXG. Both parts maintain identical I/O configuration, interface protocol, output type, and package footprint. These parts are active products with ROHS3 compliance and full availability. The TCA9535RTWR provides the widest voltage supply range (1.65V ~ 5.5V), matching the original specification. MAX7311ATG+T is supplied in Tape & Reel packaging, suitable for automated assembly processes.

Alternative Substitutes (Conditional):

MAX7311ATG+ and MAX7318ATG+ offer equivalent functionality with higher output current capability (31mA/43mA versus 10mA/25mA) and enhanced clock frequency (400 kHz). These parts are suitable for applications requiring increased drive capability. Operating temperature range is reduced to -40°C ~ 125°C.

PCA9535CHF,118 maintains the same manufacturer base product number and current output specifications but features open-drain output instead of push-pull. This part requires circuit design verification to confirm compatibility with existing pull-up resistor configurations and load impedance requirements.

Frequently Asked Questions (FAQ)

Q: Can MAX7311ATG+ replace PCA9535EMTTXG directly?

A: Yes, with design verification. The MAX7311ATG+ maintains 16-bit I/O, I2C/SMBus interface, and 24-QFN package compatibility. The higher clock frequency (400 kHz) and output current (31mA/43mA) are backward compatible. Verify that the reduced operating temperature range (-40°C ~ 125°C versus -55°C ~ 125°C) meets application requirements.

Q: What is the difference between MAX7311ATG+ and MAX7311ATG+T?

A: Both parts are functionally identical. The primary difference is packaging: MAX7311ATG+ is supplied in Tube packaging, while MAX7311ATG+T is supplied in Tape & Reel (TR) format. Select based on assembly process requirements.

Q: Why is PCA9535CHF,118 listed as a substitute if it has open-drain output?

A: PCA9535CHF,118 maintains the same base product number and I/O configuration. Open-drain output is compatible with applications using external pull-up resistors. Verify circuit design compatibility before selection.

Q: Is TCA9535RTWR suitable for low-temperature applications?

A: TCA9535RTWR operates from -40°C to 85°C. For applications requiring -55°C operation, this part is not suitable. The original PCA9535EMTTXG specification of -55°C ~ 125°C is not fully matched by any substitute part.

Q: What is the significance of Moisture Sensitivity Level (MSL) differences?

A: PCA9535EMTTXG and all substitutes except TCA9535RTWR have MSL 1 (Unlimited shelf life). TCA9535RTWR has MSL 2 (1 Year shelf life), requiring controlled storage conditions. For long-term inventory management, MSL 1 parts are preferred.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts (MAX7311ATG+, MAX7311ATG+T, MAX7318ATG+, PCA9535CHF,118, TCA9535RTWR) are ROHS3 compliant and REACH unaffected, matching the original part's compliance status.