PCA9534ADB Equivalent & Substitute Parts

Part Overview

The PCA9534ADB is an 8-bit I/O expander manufactured by Texas Instruments, designed for I2C and SMBus communication at 400 kHz. This device is classified as Last Time Buy, indicating discontinued production with limited remaining inventory. The PCA9534ADB operates across a supply voltage range of 2.3V to 5.5V and supports push-pull output configuration with interrupt capability. Finding equivalent substitute parts is necessary due to the Last Time Buy status, which restricts long-term availability for new designs and production runs.

Substiute Parts

PCA9534ADB

Texas InstrumentsIn Stock: 1606PCA9534ADB Datasheet

Current PartRFQ

TCA9534APWR

Texas InstrumentsIn Stock: 2376TCA9534APWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9534ADB is determined by the following critical parameters:

• I/O Count: 8 I/O lines (non-negotiable for functional equivalence)
• Interface Protocol: I2C communication at 400 kHz minimum
• Output Configuration: Push-pull output type
• Interrupt Capability: Interrupt output support required
• Supply Voltage Compatibility: Overlapping voltage operating ranges
• Package Compatibility: Surface mount packages with compatible pinouts
• Compliance Standards: ROHS3 compliance and EAR99 classification

The TCA9534APWR qualifies as a direct substitute based on matching I/O count, I2C interface at 400 kHz, push-pull output, interrupt support, and surface mount configuration. Both devices share the same base product number (PCA9534 vs. TCA9534) and are manufactured by Texas Instruments, ensuring functional and electrical compatibility within the specified parameter constraints.

Parameter Comparison

Engineering Selection Recommendations

The TCA9534APWR is the manufacturer-recommended substitute for the PCA9534ADB. Selection of this substitute is supported by the following factors:

• Product Status: The TCA9534APWR maintains Active product status, ensuring continued availability and long-term supply chain reliability compared to the Last Time Buy status of the PCA9534ADB.
• Compliance Alignment: Both devices maintain ROHS3 compliance and EAR99 classification, ensuring regulatory consistency in design transitions.
• Functional Equivalence: Matching I/O count, interface protocol, clock frequency, output type, and interrupt capability provide direct functional replacement without design modification.
• Supply Voltage Enhancement: The TCA9534APWR extends the lower supply voltage limit to 1.65V, providing additional operational flexibility in low-power applications while maintaining full compatibility at the PCA9534ADB operating range of 2.3V to 5.5V.
• Package Consideration: Both devices use 16-pin SSOP/TSSOP surface mount packages with compatible pinouts, though physical package dimensions differ slightly (5.30mm vs. 4.40mm width). PCB layout verification is required for package transition.

Frequently Asked Questions (FAQ)

Q: Can the TCA9534APWR directly replace the PCA9534ADB without firmware changes?

A: Yes. Both devices implement identical I2C register architecture and command protocols for 8-bit I/O expansion at 400 kHz. No firmware modification is required for functional substitution.

Q: What is the difference between 16-SSOP and 16-TSSOP packages?

A: Both are 16-pin surface mount packages with compatible pinouts. The primary difference is physical width: 16-SSOP measures 5.30mm while 16-TSSOP measures 4.40mm. PCB footprint and solder pad layouts must be verified for compatibility with your specific board design.

Q: Is the TCA9534APWR compatible with SMBus applications designed for the PCA9534ADB?

A: The TCA9534APWR supports I2C protocol at 400 kHz. SMBus is a subset of I2C, so SMBus-compliant applications will function correctly. However, verify that your application does not rely on SMBus-specific features beyond standard I2C communication.

Q: What is the voltage supply advantage of the TCA9534APWR?

A: The TCA9534APWR operates from 1.65V to 5.5V, extending the lower voltage limit by 0.65V compared to the PCA9534ADB (2.3V to 5.5V). This enables use in ultra-low-power applications while maintaining full compatibility at standard operating voltages.

Q: Are there any thermal or current output differences between these devices?

A: The provided specifications do not include thermal characteristics or detailed current output ratings for the TCA9534APWR. Both devices specify push-pull output configuration. Consult the respective Texas Instruments datasheets for complete electrical specifications if current output requirements exceed standard I/O expander ratings.

Q: What inventory status should I consider for production planning?

A: The PCA9534ADB has 1558 units in stock with Last Time Buy status, indicating no future production. The TCA9534APWR has 2272 units in stock with Active product status, ensuring continued availability for ongoing production and future orders.