PCA9554DGVR Equivalent & Substitute Parts

Part Overview

The PCA9554DGVR is an 8-bit I/O expander with I2C and SMBus interface operating at 400 kHz, manufactured by Texas Instruments in a 16-TVSOP surface mount package. This device is designated as Last Time Buy, indicating end-of-life status. Alternative equivalent parts are necessary for new designs, ongoing production, or inventory replenishment when the primary part becomes unavailable.

Substiute Parts

PCA9554DGVR

Texas InstrumentsIn Stock: 2898PCA9554DGVR Datasheet

Current PartRFQ

TCA9554DBR

Texas InstrumentsIn Stock: 64463TCA9554DBR Datasheet

MFR RecommendedRFQ

TCA9554PWR

Texas InstrumentsIn Stock: 42237TCA9554PWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the PCA9554DGVR is determined by the following critical parameters:

• Functional equivalence: 8-bit I/O expander with I2C/SMBus interface at 400 kHz
• Electrical compatibility: Supply voltage range, output current capability, and operating temperature range
• Package compatibility: Surface mount technology with compatible pin count and footprint
• Interface protocol: I2C and SMBus support with interrupt output capability
• Compliance: RoHS3 and REACH compliance status

The substitute parts TCA9554DBR and TCA9554PWR maintain functional equivalence through identical I/O count, interface protocol, clock frequency, and interrupt output features. Both are manufactured by Texas Instruments and share the same base product number (TCA9554), ensuring design compatibility. Differences in package type (SSOP vs. TSSOP vs. TVSOP) and supply voltage minimum threshold do not affect functional substitution when PCB layout accommodates the alternative package.

Parameter Comparison

Engineering Selection Recommendations

TCA9554PWR is the primary substitute for PCA9554DGVR. Both devices share identical package dimensions (16-TSSOP, 0.173" width, 4.40mm), enabling direct PCB footprint compatibility without layout modification. Both support I2C and SMBus protocols with 400 kHz operation. TCA9554PWR is in Active product status with higher inventory availability (42,131 units), ensuring supply chain continuity. The extended supply voltage range (1.65V ~ 5.5V) provides additional design flexibility compared to the PCA9554DGVR minimum of 2.3V.

TCA9554DBR is a secondary substitute suitable when package footprint modification is acceptable. The 16-SSOP package (0.209" width, 5.30mm) requires PCB layout adjustment but maintains all functional and electrical parameters. TCA9554DBR operates with I2C interface only (SMBus support not specified), which may affect compatibility in systems requiring explicit SMBus protocol compliance. TCA9554DBR offers the highest inventory availability (64,405 units) and lowest supply voltage minimum (1.65V).

Both substitute parts maintain ROHS3 compliance, unlimited MSL rating, and identical operating temperature range (-40°C ~ 85°C), ensuring regulatory and environmental compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can TCA9554PWR replace PCA9554DGVR without PCB modification?

A: Yes. Both devices use the 16-TSSOP package with identical 0.173" width and 4.40mm dimensions, allowing direct footprint substitution without PCB layout changes.

Q: What is the functional difference between TCA9554DBR and TCA9554PWR?

A: Both provide 8-bit I/O expansion with I2C interface at 400 kHz. TCA9554PWR explicitly supports SMBus protocol; TCA9554DBR specifies I2C only. The primary difference is package type: TCA9554DBR uses 16-SSOP (0.209" width), while TCA9554PWR uses 16-TSSOP (0.173" width).

Q: Does the lower supply voltage minimum of TCA9554DBR and TCA9554PWR affect compatibility?

A: No. Both substitute parts operate across 1.65V ~ 5.5V, which encompasses the original PCA9554DGVR range of 2.3V ~ 5.5V. Systems designed for the original part will function with either substitute.

Q: Why is PCA9554DGVR designated Last Time Buy?

A: Last Time Buy status indicates the manufacturer has discontinued this specific part number variant. Substitute parts with identical functionality and active product status are recommended for new designs and ongoing production.

Q: Are all three parts RoHS3 compliant?

A: Yes. PCA9554DGVR, TCA9554DBR, and TCA9554PWR are all ROHS3 Compliant with unlimited MSL rating (1), meeting current environmental and reliability standards.

Q: Which substitute should be selected for maximum inventory availability?

A: TCA9554DBR offers the highest inventory (64,405 units). However, if PCB footprint compatibility is required without modification, TCA9554PWR (42,131 units) is the appropriate choice.