PCA9535RTWR Equivalent & Substitute Parts

Part Overview

The PCA9535RTWR is a 16-bit I/O expander interface component manufactured by Texas Instruments, designed for I2C and SMBus communication at 400 kHz. This device operates across a supply voltage range of 2.3V to 5.5V and supports operating temperatures from -40°C to 85°C. The component is classified as Last Time Buy, indicating discontinued production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring 16-bit I/O expansion functionality.

Substiute Parts

PCA9535RTWR

Texas InstrumentsIn Stock: 3166PCA9535RTWR Datasheet

Current PartRFQ

TCA9535RTWR

Texas InstrumentsIn Stock: 2250TCA9535RTWR Datasheet

DirectRFQ

MAX7311ATG+

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

MFR RecommendedRFQ

MAX7311ATG+T

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

MFR RecommendedRFQ

MAX7312ATG+T

Analog Devices Inc./Maxim IntegratedIn Stock: 7051MAX7312ATG+T Datasheet

MFR RecommendedRFQ

MAX7318ATG+

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

MFR RecommendedRFQ

PCA9535AHF,128

NXP USA Inc.In Stock: 29071PCA9535AHF,128 Datasheet

MFR RecommendedRFQ

PCA9535CHF,118

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

MFR RecommendedRFQ

XRA1201IL24TR-F

MaxLinear, Inc.In Stock: 26901XRA1201IL24TR-F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCA9535RTWR are grouped based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Number of I/O: 16 bits
• Interface Protocol: I2C, SMBus 400 kHz
• Interrupt Output: Yes
• Features: POR (Power-On Reset)
• Mounting Type: Surface Mount
• Package Type: 24-pin QFN variants
• RoHS3 Compliance

Substitution Categories:

Category 1: Direct Texas Instruments Alternatives TCA9535RTWR maintains identical I/O count, interface, and clock frequency with expanded supply voltage range (1.65V ~ 5.5V) and Active product status.

Category 2: Analog Devices/Maxim Integrated Series MAX7311ATG+, MAX7311ATG+T, MAX7312ATG+T, and MAX7318ATG+ provide 16-bit I/O expansion with enhanced output current capability (31mA, 43mA) and extended operating temperature range (-40°C ~ 125°C). These devices use 24-TQFN packaging and maintain Active product status.

Category 3: NXP USA Inc. Variants PCA9535AHF,128 and PCA9535CHF,118 are NXP variants of the PCA9535 base product. PCA9535AHF,128 uses Push-Pull output with expanded supply voltage (1.65V ~ 5.5V). PCA9535CHF,118 uses Open Drain output with standard supply voltage (2.3V ~ 5.5V).

Category 4: MaxLinear Alternative XRA1201IL24TR-F provides 16-bit I/O expansion with Open Drain output and restricted supply voltage range (1.65V ~ 3.6V), suitable for lower-voltage applications.

Parameter Comparison

Engineering Selection Recommendations

Recommended Primary Substitute: TCA9535RTWR TCA9535RTWR is the preferred substitute for PCA9535RTWR. Both devices are manufactured by Texas Instruments, maintain identical I/O architecture and interface specifications, and share the same 24-WQFN package footprint. TCA9535RTWR holds Active product status, ensuring long-term availability. The expanded supply voltage range (1.65V ~ 5.5V) provides additional design flexibility while maintaining full backward compatibility with existing circuit implementations.

Secondary Substitutes: Analog Devices/Maxim Integrated Series MAX7311ATG+, MAX7311ATG+T, MAX7312ATG+T, and MAX7318ATG+ are suitable alternatives for applications requiring enhanced output current capability (31mA, 43mA versus 10mA, 25mA) or extended operating temperature range (-40°C ~ 125°C). These devices maintain Active product status and ROHS3 compliance. Package migration from 24-WQFN to 24-TQFN requires PCB layout verification.

Alternative Substitutes: NXP USA Inc. Variants PCA9535AHF,128 provides direct functional equivalence with Push-Pull output and Active product status. PCA9535CHF,128 offers Open Drain output configuration for applications requiring pull-up resistor networks. Both NXP variants use 24-HWQFN packaging and maintain ROHS3 compliance.

Limited Scope Alternative: XRA1201IL24TR-F XRA1201IL24TR-F is suitable only for applications operating within the restricted supply voltage range of 1.65V to 3.6V. This device uses Open Drain output and is appropriate for low-voltage system designs. Package migration to 24-QFN requires verification of mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can PCA9535RTWR be directly replaced with TCA9535RTWR without circuit modification? A: Yes. TCA9535RTWR maintains identical pin configuration, I/O count, interface protocol, and clock frequency. The expanded supply voltage range (1.65V ~ 5.5V) is backward compatible with designs using the original 2.3V ~ 5.5V specification. No circuit modifications are required.

Q: What are the key differences between Push-Pull and Open Drain output types? A: Push-Pull output (PCA9535RTWR, TCA9535RTWR, MAX7311/7312/7318 series, PCA9535AHF,128) actively drives both high and low logic states. Open Drain output (PCA9535CHF,118, XRA1201IL24TR-F) requires external pull-up resistors and is suitable for multi-master I2C bus configurations or applications requiring active pull-down capability.

Q: Are the Maxim Integrated MAX7311/7312/7318 devices pin-compatible with PCA9535RTWR? A: All devices maintain 16-bit I/O architecture and identical functional pin assignments. However, MAX7311/7312/7318 series use 24-TQFN packaging while PCA9535RTWR uses 24-WQFN packaging. Physical footprint differences require PCB layout redesign. Electrical compatibility is maintained.

Q: What is the significance of the supply voltage range difference between PCA9535RTWR (2.3V ~ 5.5V) and TCA9535RTWR (1.65V ~ 5.5V)? A: TCA9535RTWR supports lower minimum supply voltage, enabling operation in battery-powered or low-voltage applications. Designs currently operating at 2.3V or higher are fully compatible with TCA9535RTWR. The expanded range provides additional design flexibility without compromising existing implementations.

Q: Is XRA1201IL24TR-F suitable as a substitute for general-purpose applications? A: XRA1201IL24TR-F is restricted to applications operating within 1.65V to 3.6V supply voltage range. It is not suitable for standard 5V or 3.3V systems operating above 3.6V. Verify supply voltage requirements before selection.

Q: What packaging considerations apply when migrating from PCA9535RTWR to Maxim Integrated alternatives? A: PCA9535RTWR uses 24-WQFN (4x4) packaging. Maxim Integrated MAX7311/7312/7318 series use 24-TQFN (4x4) packaging. While both are 24-pin QFN variants with identical pin count, physical dimensions and land pattern differ. PCB layout verification and potential redesign are required.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, consistent with the original PCA9535RTWR specification.

Q: What is the impact of higher output current capability in Maxim Integrated devices? A: Maxim Integrated MAX7311/7312/7318 series provide 31mA source and 43mA sink current versus 10mA source and 25mA sink current in PCA9535RTWR. Higher output current enables direct driving of additional loads without intermediate buffer stages. Applications with standard I/O loading requirements are unaffected by this difference.