PCA9539DBR Equivalent & Substitute Parts

Part Overview

The PCA9539DBR is a 16-bit I/O Expander designed for I2C and SMBus communication at 400 kHz, packaged in a 24-SSOP surface mount configuration. This component is classified as Obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production requirements. The part operates across a supply voltage range of 2.3V to 5.5V and supports interrupt output with push-pull output configuration, making it suitable for applications requiring expanded digital I/O capabilities in embedded systems.

Substiute Parts

PCA9539DBR

Texas InstrumentsIn Stock: 154114PCA9539DBR Datasheet

Current PartRFQ

TCA9539PWR

Texas InstrumentsIn Stock: 61089TCA9539PWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9539DBR is determined by strict equivalence across the following critical parameters:

• I/O Count: 16-bit configuration required
• Communication Protocol: I2C and SMBus compatibility at 400 kHz
• Output Configuration: Push-pull output type with interrupt capability
• Current Specifications: 10mA and 25mA source/sink capability
• Operating Temperature Range: -40°C to 85°C minimum
• Compliance: ROHS3 compliance and REACH unaffected status

The TCA9539PWR qualifies as a direct substitute based on matching all functional and electrical parameters. The primary distinction lies in package geometry and supply voltage range, which do not preclude substitution in applications designed for the original part.

Parameter Comparison

Engineering Selection Recommendations

The TCA9539PWR is the manufacturer-recommended substitute for the obsolete PCA9539DBR. Selection of the TCA9539PWR is supported by the following factors:

• Active Product Status: The TCA9539PWR maintains active production status, ensuring long-term availability and supply chain continuity.
• Functional Equivalence: All electrical specifications, I/O configuration, communication protocols, and output characteristics match the original part.
• Compliance Alignment: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements.
• Enhanced Supply Voltage Range: The TCA9539PWR supports operation down to 1.65V, providing greater flexibility in low-voltage applications compared to the 2.3V minimum of the PCA9539DBR.
• Package Consideration: The 24-TSSOP package is narrower (4.40mm vs. 5.30mm) than the 24-SSOP, requiring PCB layout verification to confirm footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can the TCA9539PWR be used as a direct replacement for the PCA9539DBR?

A: Yes, the TCA9539PWR is functionally equivalent across all electrical and operational parameters. However, the package geometry differs (24-TSSOP vs. 24-SSOP), requiring PCB footprint verification before implementation.

Q: What is the primary reason for substitution?

A: The PCA9539DBR is classified as Obsolete. The TCA9539PWR is the active equivalent from the same manufacturer, ensuring continued availability and support.

Q: Are there any voltage supply differences between these parts?

A: The TCA9539PWR supports a lower minimum supply voltage (1.65V vs. 2.3V). Both parts support the same maximum of 5.5V. This difference does not prevent substitution in applications designed for the original part.

Q: What are the package differences?

A: The PCA9539DBR uses 24-SSOP packaging (0.209" width, 5.30mm), while the TCA9539PWR uses 24-TSSOP packaging (0.173" width, 4.40mm). The TSSOP package is narrower and requires PCB layout confirmation for compatibility.

Q: Do both parts support the same I/O and communication specifications?

A: Yes. Both parts provide 16 I/O lines, support I2C and SMBus protocols at 400 kHz, feature push-pull output configuration, and deliver equivalent current source/sink capabilities of 10mA and 25mA.

Q: Are compliance certifications equivalent?

A: Yes. Both parts are ROHS3 compliant and REACH unaffected, meeting the same regulatory standards.