PCF8574ARGYRG4 Equivalent & Substitute Parts

Part Overview

The PCF8574ARGYRG4 is an 8-bit I/O expander interface circuit manufactured by Texas Instruments, designed for I2C communication at 100 kHz clock frequency. This component operates across a 2.5V to 6V supply voltage range and features push-pull output configuration with interrupt output capability. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Substiute Parts

PCF8574ARGYRG4

Texas InstrumentsIn Stock: 854PCF8574ARGYRG4 Datasheet

Current PartRFQ

PCF8574ARGYR

Texas InstrumentsIn Stock: 3312PCF8574ARGYR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCF8574ARGYRG4 is determined by strict equivalence across the following critical parameters:

• I/O Configuration: 8-bit I/O expander
• Communication Protocol: I2C at 100 kHz
• Electrical Specifications: 2.5V to 6V supply voltage, push-pull output, 1mA/25mA source/sink current
• Functional Features: Interrupt output capability, Power-On Reset (POR)
• Package Specification: 20-VFQFN Exposed Pad surface mount
• Operating Range: -40°C to 85°C
• Compliance: ROHS3 Compliant

The PCF8574ARGYR qualifies as a direct substitute based on identical electrical, functional, and package specifications. The primary distinction is packaging format: the substitute is supplied in Tape & Reel (TR) configuration versus the original part's packaging specification.

Parameter Comparison

Engineering Selection Recommendations

The PCF8574ARGYR is a direct functional equivalent to the PCF8574ARGYRG4 and is suitable for component replacement in all applications requiring an 8-bit I2C I/O expander. The substitute part maintains identical electrical performance, package footprint, and compliance certifications (ROHS3, REACH Unaffected, EAR99 classification).

The primary advantage of selecting PCF8574ARGYR is its active product status with higher inventory availability (3204 units in stock versus 833 units for the original part). Both parts share the same base product number (PCF8574) and are manufactured by Texas Instruments, ensuring design continuity and long-term supply chain reliability.

Frequently Asked Questions (FAQ)

Q: Can PCF8574ARGYR be used as a direct replacement for PCF8574ARGYRG4?

A: Yes. Both parts are electrically and functionally identical. They feature the same 8-bit I2C I/O expander architecture, 100 kHz clock frequency, 2.5V to 6V supply range, push-pull output configuration, and 20-VFQFN package footprint. The substitute part is pin-compatible and requires no circuit modifications.

Q: What is the difference between these two part numbers?

A: The primary difference is packaging format. PCF8574ARGYRG4 uses standard packaging, while PCF8574ARGYR is supplied in Tape & Reel (TR) configuration. This distinction affects procurement and handling but does not impact electrical performance or functionality.

Q: Are there any compliance or certification differences?

A: No. Both parts maintain identical compliance status: ROHS3 Compliant, REACH Unaffected, and EAR99 classification. They are functionally equivalent from a regulatory and environmental standpoint.

Q: Why is the original part discontinued?

A: PCF8574ARGYRG4 is discontinued at DiGi Electronics. The base product PCF8574 remains in active production through the PCF8574ARGYR variant, ensuring continued availability of this I/O expander architecture.

Q: Will PCF8574ARGYR work in my existing PCB design?

A: Yes. The substitute part uses the identical 20-VFQFN Exposed Pad surface mount package with the same pin configuration and electrical specifications. No PCB redesign is required.