PCA9538DWR Equivalent & Substitute Parts

Part Overview

The PCA9538DWR is an 8-bit I/O expander designed for I2C and SMBus communication at 400 kHz, manufactured by Texas Instruments in a 16-SOIC surface mount package. This device provides push-pull output capability with interrupt output functionality and power-on reset (POR) features. The PCA9538DWR is currently in Last Time Buy status, making identification of functionally equivalent alternatives essential for ongoing design support and procurement planning.

Substiute Parts

PCA9538DWR

Texas InstrumentsIn Stock: 3118PCA9538DWR Datasheet

Current PartRFQ

TCA9538PWR

Texas InstrumentsIn Stock: 2342TCA9538PWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9538DWR is determined by the following core parameters:

• I/O Count: 8 bits (fixed requirement)
• Interface Protocol: I2C at 400 kHz minimum (SMBus compatibility optional)
• Output Configuration: Push-Pull topology
• Interrupt Capability: Required
• Supply Voltage Range: Minimum 2.3V support
• Operating Temperature Range: -40°C ~ 85°C
• Package Compatibility: Surface mount packages acceptable with PCB layout considerations
• Regulatory Compliance: ROHS3 and REACH status alignment

The TCA9538PWR meets these core substitution criteria while operating in an Active product status, providing long-term availability assurance compared to the Last Time Buy status of the PCA9538DWR.

Parameter Comparison

Engineering Selection Recommendations

The TCA9538PWR is a functionally equivalent substitute for the PCA9538DWR based on matching I/O count, interface protocol, clock frequency, output topology, interrupt capability, and operating temperature range. Both devices maintain ROHS3 compliance and unlimited moisture sensitivity rating.

The primary consideration for substitution is package transition from 16-SOIC to 16-TSSOP, which requires PCB layout modification. The TCA9538PWR offers superior long-term availability through Active product status, whereas the PCA9538DWR is in Last Time Buy status. The TCA9538PWR additionally supports a lower minimum supply voltage (1.65V versus 2.3V), providing expanded operational flexibility in low-voltage applications.

Frequently Asked Questions (FAQ)

Q: Can the TCA9538PWR directly replace the PCA9538DWR without PCB modifications?

A: No. The PCA9538DWR uses a 16-SOIC package (0.295" width) while the TCA9538PWR uses a 16-TSSOP package (0.173" width). PCB footprint redesign is required for physical mounting.

Q: Are the I2C communication protocols identical between these parts?

A: Both devices operate at 400 kHz I2C. The PCA9538DWR explicitly supports SMBus; the TCA9538PWR specification lists I2C support. Verify SMBus compatibility requirements for your application before substitution.

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

A: The PCA9538DWR operates from 2.3V to 5.5V, while the TCA9538PWR operates from 1.65V to 5.5V. If your design operates below 2.3V, only the TCA9538PWR is suitable. Both support standard 3.3V and 5V logic levels.

Q: Why is the PCA9538DWR in Last Time Buy status?

A: Last Time Buy status indicates the manufacturer is discontinuing this product. Existing inventory is available for final orders, but long-term supply is not guaranteed. The TCA9538PWR Active status ensures continued availability.

Q: Are there any output current differences between these parts?

A: The PCA9538DWR specifies 10mA and 25mA output source/sink current. The TCA9538PWR output current specification is not provided in the available data. Consult detailed datasheets to confirm current capability requirements for your application.

Q: Do both parts have identical interrupt output functionality?

A: Yes. Both the PCA9538DWR and TCA9538PWR include interrupt output capability, enabling interrupt-driven I/O monitoring in host systems.