PCA9557D Equivalent & Substitute Parts

Part Overview

The PCA9557D is an 8-bit I/O Expander designed for I2C and SMBus communication at 400 kHz, packaged in a 16-SOIC surface mount configuration. This component is classified as Obsolete, which necessitates identification of active equivalent parts for new designs and ongoing production requirements. The PCA9557D provides open drain and push-pull output options with a supply voltage range of 2.3V to 5.5V and operates across the industrial temperature range of -40°C to 85°C.

Substiute Parts

PCA9557D

Texas InstrumentsIn Stock: 4106PCA9557D Datasheet

Current PartRFQ

PCA9557DR

Texas InstrumentsIn Stock: 154594PCA9557DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9557D is determined by strict equivalence across the following critical parameters:

• Number of I/O: 8 channels
• Interface Protocol: I2C and SMBus compatibility
• Clock Frequency: 400 kHz operation
• Output Configuration: Open Drain and Push-Pull capability
• Current Ratings: 10mA and 25mA source/sink
• Supply Voltage Range: 2.3V to 5.5V
• Package Type: 16-SOIC form factor
• Operating Temperature Range: -40°C to 85°C
• Compliance Standards: ROHS3, REACH Unaffected

The PCA9557DR is identified as a direct substitute based on identical electrical specifications and mechanical compatibility. The primary distinction is product status: PCA9557D is Obsolete, while PCA9557DR is Active, making PCA9557DR the recommended selection for new designs and production continuity.

Parameter Comparison

Engineering Selection Recommendations

The PCA9557DR is the direct equivalent for the obsolete PCA9557D. Both parts maintain identical electrical and mechanical specifications, ensuring pin-for-pin and functional compatibility. The PCA9557DR is classified as Active, providing assured long-term availability and supply chain continuity. Both parts satisfy ROHS3 compliance and REACH requirements, making either suitable for regulated applications. For new designs and production transitions, PCA9557DR is the appropriate selection due to its active product status and standard packaging availability through Cut Tape and Digi-Reel formats.

Frequently Asked Questions (FAQ)

Q: Can PCA9557DR be used as a direct replacement for PCA9557D?

A: Yes. The PCA9557DR is electrically and mechanically identical to the PCA9557D across all specified parameters, including I/O count, interface protocol, clock frequency, output types, current ratings, supply voltage, temperature range, and package configuration.

Q: What is the primary reason to transition from PCA9557D to PCA9557DR?

A: The PCA9557D is classified as Obsolete, while the PCA9557DR is Active. This distinction ensures long-term component availability and supply chain reliability for ongoing production and new designs.

Q: Are there any differences in compliance or certifications between these parts?

A: No. Both the PCA9557D and PCA9557DR are ROHS3 Compliant and REACH Unaffected, with identical Moisture Sensitivity Level (MSL) ratings of 1 (Unlimited).

Q: Does the packaging format affect electrical performance?

A: No. The PCA9557D is supplied in Tube packaging, while the PCA9557DR is available in Cut Tape (CT) and Digi-Reel® formats. The 16-SOIC package configuration and all electrical specifications remain identical.

Q: Are there any pin-count or pinout differences?

A: No. Both parts use the 16-SOIC package with identical pinout and pin assignments.

Q: What supply voltage range is supported?

A: Both parts operate across a supply voltage range of 2.3V to 5.5V, supporting both 3.3V and 5V logic systems.

Q: What is the maximum operating temperature range?

A: Both parts operate across -40°C to 85°C, suitable for industrial and commercial temperature environments.