PCA9557DGVR Equivalent & Substitute Parts

Part Overview

The PCA9557DGVR is an 8-bit I/O expander designed for I2C and SMBus communication at 400 kHz, packaged in a 16-TVSOP surface mount configuration. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The functional equivalence of substitute parts enables direct replacement in applications requiring 8-channel I/O expansion with open drain and push-pull output capabilities.

Substiute Parts

PCA9557DGVR

Texas InstrumentsIn Stock: 1240PCA9557DGVR Datasheet

Current PartRFQ

PCA9557PWR

Texas InstrumentsIn Stock: 30955PCA9557PWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCA9557DGVR are identified based on strict electrical and mechanical parameter equivalence within the PCA9557 product family. The substitution criteria are:

• Identical base product number (PCA9557)
• Matching number of I/O channels (8)
• Identical interface protocol (I2C, SMBus 400 kHz)
• Equivalent output type configuration (Open Drain, Push-Pull)
• Matching current specifications (10mA, 25mA source/sink)
• Identical supply voltage range (2.3V ~ 5.5V)
• Identical operating temperature range (-40°C ~ 85°C)
• Equivalent RoHS and compliance certifications

The primary distinction between the main part and its substitute lies in the package type: the PCA9557DGVR uses 16-TVSOP packaging, while the substitute PCA9557PWR uses 16-TSSOP packaging. Both packages maintain identical pin pitch and electrical connectivity, enabling functional interchangeability with appropriate PCB layout considerations.

Parameter Comparison

Engineering Selection Recommendations

The PCA9557PWR is the designated manufacturer-recommended substitute for the obsolete PCA9557DGVR. Both components maintain identical electrical specifications and are ROHS3 compliant with equivalent moisture sensitivity ratings. The PCA9557PWR carries active product status, ensuring continued availability and manufacturing support. The package transition from 16-TVSOP to 16-TSSOP requires PCB layout verification to confirm pin-to-pin compatibility, though both packages maintain the same 0.173" width and pitch specifications. Selection of the PCA9557PWR is appropriate for new designs and production continuity where the PCA9557DGVR is no longer available.

Frequently Asked Questions (FAQ)

Q: Can the PCA9557PWR directly replace the PCA9557DGVR without PCB modifications?

A: Both parts share identical electrical specifications and pin pitch. However, the package transition from 16-TVSOP to 16-TSSOP requires verification of PCB footprint compatibility. Consult the respective datasheets for precise package dimensions and land pattern specifications.

Q: What is the primary reason for substituting the PCA9557DGVR?

A: The PCA9557DGVR is classified as obsolete. The PCA9557PWR provides functional equivalence with active product status and continued manufacturer support.

Q: Are the I/O expansion capabilities identical between these parts?

A: Yes. Both components provide 8 I/O channels with identical I2C/SMBus 400 kHz interface, open drain and push-pull output configurations, and matching current source/sink specifications of 10mA and 25mA.

Q: Do both parts operate within the same voltage and temperature ranges?

A: Yes. Both the PCA9557DGVR and PCA9557PWR operate across 2.3V to 5.5V supply voltage and -40°C to 85°C temperature range.

Q: Are there any compliance or certification differences?

A: Both parts are ROHS3 compliant with MSL rating of 1 (Unlimited). No compliance differences exist between the two variants.