PCA9535DBR I/O Expander 16 I2C SMBus Equivalent & Substitute Parts

Part Overview

The PCA9535DBR is a 16-bit I/O expander interface component manufactured by Texas Instruments, designed for I2C and SMBus communication at 400 kHz. This device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design requirements and production continuity. The component provides 16 I/O lines with push-pull output configuration, interrupt output capability, and power-on reset functionality in a 24-SSOP surface mount package.

Substiute Parts

PCA9535DBR

Texas InstrumentsIn Stock: 6320PCA9535DBR Datasheet

Current PartRFQ

TCA9535DBR

Texas InstrumentsIn Stock: 2445TCA9535DBR Datasheet

MFR RecommendedRFQ

MAX7312AAG+

Analog Devices Inc./Maxim IntegratedIn Stock: 3806MAX7312AAG+ Datasheet

MFR RecommendedRFQ

MAX7318AAG+

Analog Devices Inc./Maxim IntegratedIn Stock: 1184MAX7318AAG+ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCA9535DBR are identified based on the following critical parameters that determine functional compatibility:

Core Compatibility Criteria:

• Number of I/O: 16 (exact match required)
• Interface Protocol: I2C, SMBus (exact match required)
• Clock Frequency: 400 kHz (exact match required)
• Output Type: Push-Pull (exact match required)
• Package / Case: 24-SSOP (exact match required)
• Interrupt Output: Yes (exact match required)
• Features: POR (exact match required)

Allowable Parameter Variations:

• Voltage Supply Range: Substitute must encompass or exceed the original range
• Operating Temperature: Substitute may extend the range
• Current Output Source/Sink: Substitute may provide equal or greater capacity
• Product Status: Active status preferred for long-term availability

The substitute parts TCA9535DBR, MAX7312AAG+, and MAX7318AAG+ meet all core compatibility criteria while maintaining functional equivalence to the PCA9535DBR.

Parameter Comparison

Engineering Selection Recommendations

TCA9535DBR (Texas Instruments)

The TCA9535DBR is the primary substitute for the PCA9535DBR. Both devices are manufactured by Texas Instruments and share identical functional specifications. The TCA9535DBR maintains active product status, ensuring long-term availability and supply chain continuity. The voltage supply range extends to 1.65V, providing enhanced low-voltage operation capability. This part is recommended for direct replacement in existing designs without modification.

MAX7312AAG+ and MAX7318AAG+ (Analog Devices Inc./Maxim Integrated)

The MAX7312AAG+ and MAX7318AAG+ are functionally equivalent alternatives from Analog Devices Inc./Maxim Integrated. Both devices provide identical I/O count, interface protocol, clock frequency, and package configuration. These parts offer enhanced output current capacity (31mA, 43mA versus 10mA, 25mA) and extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C). Both maintain active product status and ROHS3 compliance. Selection between these alternatives depends on design requirements for output current and thermal operating conditions.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original PCA9535DBR specifications.

Frequently Asked Questions (FAQ)

Q: Can the TCA9535DBR be used as a direct replacement for the PCA9535DBR?

A: Yes. The TCA9535DBR is functionally equivalent to the PCA9535DBR. Both devices provide 16 I/O lines, I2C/SMBus interface at 400 kHz, push-pull output configuration, and identical package specifications. The TCA9535DBR is manufactured by the same supplier and is the recommended primary substitute.

Q: What are the key differences between the MAX7312AAG+ and MAX7318AAG+ compared to the PCA9535DBR?

A: The MAX7312AAG+ and MAX7318AAG+ maintain all core functional parameters: 16 I/O, I2C/SMBus 400 kHz interface, push-pull output, and 24-SSOP package. The primary differences are increased output current capacity (31mA, 43mA versus 10mA, 25mA) and extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C). These enhancements do not affect compatibility but provide additional design margin for high-current or high-temperature applications.

Q: Are all substitute parts available in the same package configuration?

A: Yes. All substitute parts are available in the 24-SSOP (0.209", 5.30mm Width) package, identical to the PCA9535DBR. This ensures mechanical and electrical compatibility without PCB redesign.

Q: What is the voltage supply compatibility between the original and substitute parts?

A: The PCA9535DBR operates at 2.3V ~ 5.5V. The TCA9535DBR extends the lower limit to 1.65V, while the MAX7312AAG+ and MAX7318AAG+ operate at 2V ~ 5.5V. All substitute parts support the original operating range and provide equal or enhanced low-voltage capability.

Q: Do all parts maintain the same compliance certifications?

A: Yes. The PCA9535DBR and all substitute parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. Compliance status is consistent across all alternatives.

Q: Why is the PCA9535DBR classified as obsolete?

A: The PCA9535DBR is listed as obsolete by the manufacturer. Active substitute parts are available to ensure design continuity and supply chain reliability for applications requiring 16-bit I/O expansion with I2C/SMBus interface.