PCA9534DB Equivalent & Substitute Parts

Part Overview

The PCA9534DB is an 8-bit I/O expander manufactured by Texas Instruments, designed for I2C and SMBus communication at 400 kHz. This device provides 8 programmable I/O pins with push-pull output capability, supporting a supply voltage range of 2.3V to 5.5V and operating temperatures from -40°C to 85°C. The PCA9534DB is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent substitute parts is necessary to ensure continued component availability and design continuity for new production runs and system updates.

Substiute Parts

PCA9534DB

Texas InstrumentsIn Stock: 886PCA9534DB Datasheet

Current PartRFQ

TCA9534PWR

Texas InstrumentsIn Stock: 165243TCA9534PWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9534DB is determined by the following critical parameters:

• I/O Count: Must be 8 bits
• Interface Protocol: Must support I2C at 400 kHz minimum
• Output Configuration: Must be push-pull type
• Output Current Capability: Must support 10mA and 25mA source/sink
• Supply Voltage Range: Must encompass or be compatible with 2.3V ~ 5.5V
• Operating Temperature Range: Must support -40°C ~ 85°C
• Package Type: Surface mount only; physical dimensions may vary
• Compliance: Must maintain ROHS3 compliance and MSL 1 rating

The TCA9534PWR meets all substitution criteria as a functionally equivalent alternative, with the primary distinction being package form factor and supply voltage range specification.

Parameter Comparison

Engineering Selection Recommendations

The TCA9534PWR is the manufacturer-recommended substitute for the PCA9534DB. Both devices are manufactured by Texas Instruments and maintain identical functional specifications for I/O count, interface protocol, clock frequency, output type, and current capability. Both devices are ROHS3 compliant with MSL 1 rating, ensuring equivalent environmental and regulatory compliance.

The primary design consideration is package form factor: the PCA9534DB uses 16-SSOP packaging (5.30mm width), while the TCA9534PWR uses 16-TSSOP packaging (4.40mm width). This difference requires PCB layout modification if direct footprint substitution is intended. The TCA9534PWR offers extended lower supply voltage capability (1.65V minimum versus 2.3V minimum), providing additional operational flexibility in low-voltage applications.

The TCA9534PWR is in Active product status with significantly higher inventory availability (165,200 units), ensuring long-term supply continuity compared to the Last Time Buy status of the PCA9534DB.

Frequently Asked Questions (FAQ)

Q: Can the TCA9534PWR directly replace the PCA9534DB without PCB modification?

A: Functional replacement is possible; however, the different package types (16-SSOP versus 16-TSSOP) require PCB footprint redesign. Pin count and signal assignments are identical, but physical dimensions differ.

Q: What is the significance of the supply voltage range difference?

A: The TCA9534PWR supports 1.65V ~ 5.5V, while the PCA9534DB supports 2.3V ~ 5.5V. The TCA9534PWR is compatible with all PCA9534DB applications and additionally supports lower voltage systems. No design changes are required for existing 2.3V ~ 5.5V applications.

Q: Are both devices suitable for industrial temperature applications?

A: Both devices operate across -40°C to 85°C, meeting industrial temperature requirements. Compliance certifications (ROHS3, MSL 1) are identical.

Q: What packaging considerations should be evaluated?

A: The 16-TSSOP package (TCA9534PWR) is narrower than 16-SSOP (PCA9534DB), which may provide space advantages in compact designs. PCB layout and assembly process compatibility must be verified for your manufacturing environment.

Q: Is SMBus protocol support critical for substitution?

A: The PCA9534DB explicitly supports both I2C and SMBus protocols. The TCA9534PWR supports I2C protocol. If SMBus-specific features are required, verify that your application uses only standard I2C communication, which both devices support identically.