PCA9555DGVR Equivalent & Substitute Parts

Part Overview

The PCA9555DGVR is a 16-bit I/O expander with I2C and SMBus interface operating at 400 kHz, manufactured by Texas Instruments in a 24-TVSOP surface mount package. This device is designated as Last Time Buy, indicating end-of-life status. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring 16-bit parallel I/O expansion with I2C/SMBus communication.

Substiute Parts

PCA9555DGVR

Texas InstrumentsIn Stock: 1114PCA9555DGVR Datasheet

Current PartRFQ

TCA9555DBR

Texas InstrumentsIn Stock: 2447TCA9555DBR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9555DGVR is determined by the following critical parameters:

• I/O Count: Must be 16 bits
• Interface Protocol: Must support I2C and SMBus at 400 kHz
• Interrupt Capability: Must include interrupt output functionality
• Output Configuration: Must be Push-Pull type
• Current Ratings: Must support 10mA and 25mA source/sink capability
• Supply Voltage Range: Must encompass or be compatible with 2.3V ~ 5.5V operation
• Operating Temperature: Must support -40°C ~ 85°C range
• Compliance: Must maintain ROHS3 compliance and MSL 1 rating

The TCA9555DBR meets all functional and electrical requirements for substitution. The primary difference is packaging format (24-SSOP versus 24-TVSOP) and supply voltage range extension (1.65V minimum versus 2.3V minimum), with the substitute offering broader voltage compatibility.

Parameter Comparison

Engineering Selection Recommendations

The TCA9555DBR is the manufacturer-recommended substitute for the PCA9555DGVR. Selection between these parts should be based on the following criteria:

Use PCA9555DGVR when:

• Existing inventory is available and cost is the primary consideration
• PCB layout is already optimized for the 24-TFSOP package footprint
• Supply chain has confirmed availability through Last Time Buy period

Use TCA9555DBR when:

• New designs are being developed or redesigned
• Active production status and long-term availability are required
• Extended supply voltage range (1.65V minimum) provides design flexibility
• PCB layout can accommodate the 24-SSOP package footprint

Both parts maintain ROHS3 compliance and identical functional specifications for I/O expansion, interface protocol, and thermal operating range. The substitute offers superior supply chain continuity through active production status.

Frequently Asked Questions (FAQ)

Q: Can TCA9555DBR be used as a direct replacement for PCA9555DGVR?

A: Functional substitution is possible with PCB layout modification. Both devices provide identical I/O count, interface protocol, interrupt capability, and electrical performance. The primary constraint is package footprint difference: 24-TFSOP (0.173" width) versus 24-SSOP (0.209" width). PCB redesign is required if the original layout was optimized for the narrower TFSOP package.

Q: What is the impact of the different supply voltage ranges?

A: The TCA9555DBR supports operation down to 1.65V, while the PCA9555DGVR minimum is 2.3V. For applications operating at 2.3V or higher, both parts are functionally equivalent. For designs requiring operation below 2.3V, only the TCA9555DBR is suitable.

Q: Are there any differences in I2C/SMBus protocol implementation?

A: Both parts implement identical I2C and SMBus protocols at 400 kHz clock frequency. No firmware or software modifications are required for protocol compatibility.

Q: What packaging considerations apply to substitution?

A: The 24-SSOP package (TCA9555DBR) is slightly wider than the 24-TFSOP package (PCA9555DGVR). PCB layout verification is mandatory before substitution to confirm adequate spacing and clearance around the component footprint.

Q: Is the TCA9555DBR available in tape and reel packaging?

A: The TCA9555DBR is supplied in Cut Tape and Digi-Reel packaging formats. Verify packaging format availability with your supplier if reel specifications are critical for automated assembly processes.