PCF8574DGVR Equivalent & Substitute Parts

Part Overview

The PCF8574DGVR is an 8-bit I/O expander with I2C interface operating at 100 kHz, manufactured by Texas Instruments in a 20-TFSOP surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The PCF8574DGVR provides push-pull output capability with interrupt functionality and operates across a 2.5V to 6V supply voltage range, suitable for embedded systems requiring expanded I/O capabilities through I2C communication.

Substiute Parts

PCF8574DGVR

Texas InstrumentsIn Stock: 3218PCF8574DGVR Datasheet

Current PartRFQ

PCF8574RGYR

Texas InstrumentsIn Stock: 2515PCF8574RGYR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCF8574DGVR is determined by functional and electrical equivalence within the PCF8574 base product family. The critical parameters governing substitution are:

• Base product number (PCF8574) ensuring identical I/O expansion functionality
• Number of I/O channels (8 bits)
• I2C interface protocol and clock frequency (100 kHz)
• Supply voltage range (2.5V ~ 6V)
• Operating temperature range (-40°C ~ 85°C)
• Output type (Push-Pull) and current specifications (1mA, 25mA)
• Interrupt output capability

The PCF8574RGYR qualifies as a direct functional substitute, sharing all electrical and operational parameters with the PCF8574DGVR. The primary difference lies in packaging format and product status, with the substitute available in active production status.

Parameter Comparison

Engineering Selection Recommendations

The PCF8574RGYR is the recommended substitute for the obsolete PCF8574DGVR based on the following criteria:

Electrical and functional equivalence is complete across all specified parameters. Both components share identical I/O count, interface protocol, clock frequency, supply voltage range, operating temperature range, output characteristics, and interrupt functionality.

Product status favors the PCF8574RGYR, which maintains active production status with current inventory availability, ensuring long-term supply chain reliability compared to the obsolete PCF8574DGVR.

Compliance certifications are equivalent, with both parts meeting ROHS3 requirements and REACH unaffected status. The substitute maintains the same ECCN and HTSUS classifications.

Package format differs between the two parts. The PCF8574DGVR uses 20-TFSOP packaging while the PCF8574RGYR uses 20-VFQFN with exposed pad. PCB layout and footprint modifications are required when transitioning between these packages.

Moisture sensitivity level increases from MSL 1 (unlimited) to MSL 2 (1 year) with the substitute, requiring appropriate handling and storage protocols during manufacturing.

Frequently Asked Questions (FAQ)

Q: Are the PCF8574DGVR and PCF8574RGYR electrically interchangeable?

A: Yes. Both components share identical electrical specifications including I/O count, I2C interface, clock frequency, supply voltage range, operating temperature, output type, and current ratings. Functional compatibility is complete at the circuit level.

Q: What is the primary reason for substitution?

A: The PCF8574DGVR is classified as obsolete. The PCF8574RGYR provides equivalent functionality with active production status and current inventory availability.

Q: Do I need to modify my PCB design to use the substitute?

A: Yes. The PCF8574DGVR uses 20-TFSOP packaging while the PCF8574RGYR uses 20-VFQFN with exposed pad. These packages have different footprints and pin configurations, requiring PCB layout redesign and new footprint implementation.

Q: Are there compliance differences between these parts?

A: No. Both parts are ROHS3 compliant and REACH unaffected. ECCN and HTSUS classifications are identical.

Q: What is the difference in moisture sensitivity?

A: The PCF8574DGVR has MSL 1 (unlimited moisture sensitivity level), while the PCF8574RGYR has MSL 2 (1 year). The substitute requires stricter moisture control during storage and manufacturing, with a one-year shelf life limit under specified humidity conditions.

Q: Can I use the PCF8574RGYR as a drop-in replacement?

A: No. While electrically equivalent, the different package types prevent direct drop-in replacement. PCB redesign with new footprint implementation is required.