PCA9535CD,118 Equivalent & Substitute Parts

Part Overview

The PCA9535CD,118 is a 16-bit I/O Expander designed for I2C and SMBus communication at 400 kHz clock frequency. This component operates across a supply voltage range of 2.3V to 5.5V and supports push-pull output configuration with interrupt capability. The device is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

PCA9535CD,118

NXP USA Inc.In Stock: 3177PCA9535CD,118 Datasheet

Current PartRFQ

PCA9535CPW,118

NXP USA Inc.In Stock: 3285PCA9535CPW,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9535CD,118 is determined by the following critical parameters:

• I/O Count: 16-bit configuration required
• Communication Protocol: I2C and SMBus compatibility at 400 kHz
• Supply Voltage: 2.3V to 5.5V operating range
• Temperature Range: -40°C to 85°C operational limits
• Output Current Capability: 10mA and 25mA source/sink specifications
• Interrupt Functionality: Interrupt output support mandatory
• Power-On Reset: POR feature required
• Compliance: ROHS3 compliance and REACH unaffected status

The PCA9535CPW,118 qualifies as a direct substitute based on matching all critical electrical parameters and maintaining identical I/O functionality, despite differences in package type and output configuration.

Parameter Comparison

Engineering Selection Recommendations

The PCA9535CPW,118 is the manufacturer-recommended substitute for the obsolete PCA9535CD,118. Both devices maintain identical electrical specifications, I/O configuration, and communication protocols. The primary differences are packaging format and output stage topology.

The substitute part carries active product status, ensuring long-term availability and supply chain continuity. Both components maintain ROHS3 compliance and REACH unaffected designation, meeting regulatory requirements for industrial and commercial applications.

Selection between these parts depends on PCB layout constraints and circuit design requirements. The 24-SOIC package of the main part accommodates wider board spacing, while the 24-TSSOP package of the substitute provides reduced footprint for space-constrained designs. The output type difference (push-pull versus open-drain) requires circuit topology verification to ensure compatibility with existing pull-up resistor configurations and load characteristics.

Frequently Asked Questions (FAQ)

Q: Can the PCA9535CPW,118 directly replace the PCA9535CD,118 in existing designs?

A: Electrical compatibility is confirmed across all functional parameters. PCB layout modification is required due to package format differences (24-SOIC to 24-TSSOP). Output stage topology differs (push-pull to open-drain), requiring verification of downstream circuit compatibility with pull-up resistor networks and load impedance.

Q: What are the key differences between these two parts?

A: The main differences are package type (24-SOIC versus 24-TSSOP), output configuration (push-pull versus open-drain), and product status (obsolete versus active). All electrical specifications, I/O count, communication protocols, and operating ranges remain identical.

Q: Are both parts compliant with current regulatory standards?

A: Both the PCA9535CD,118 and PCA9535CPW,118 are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components in industrial and commercial applications.

Q: What is the significance of the product status difference?

A: The PCA9535CD,118 is classified as obsolete, indicating discontinued manufacturing and limited availability. The PCA9535CPW,118 maintains active status, ensuring reliable supply chain access and manufacturer support for new designs and ongoing production requirements.

Q: How do the package dimensions affect circuit design?

A: The 24-SOIC package (0.295" width) provides larger pin spacing suitable for manual assembly and standard PCB layouts. The 24-TSSOP package (0.173" width) reduces board footprint by approximately 41%, enabling compact designs but requiring surface-mount assembly capabilities and adjusted trace routing.

Q: What considerations apply to the output type difference?

A: Push-pull output (main part) actively drives both high and low logic states. Open-drain output (substitute) requires external pull-up resistors for high-state operation. Circuit design must accommodate this topology difference to maintain proper signal levels and timing characteristics.