PCF8574APWRG4 Equivalent & Substitute Parts

Part Overview

The PCF8574APWRG4 is an 8-bit I/O expander with I2C interface operating at 100 kHz, designed for applications requiring remote I/O expansion in embedded systems. Manufactured by Texas Instruments in a 20-TSSOP surface mount package, this component provides push-pull output capability with integrated power-on reset (POR) functionality.

The PCF8574APWRG4 is currently discontinued at DiGi Electronics. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for new production runs and legacy system maintenance.

Substiute Parts

PCF8574APWRG4

Texas InstrumentsIn Stock: 937PCF8574APWRG4 Datasheet

Current PartRFQ

PCF8574APWR

Texas InstrumentsIn Stock: 38385PCF8574APWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCF8574APWRG4 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 Characteristics: Push-pull output, 1mA/25mA source/sink capability, 2.5V–6V supply range
• Interrupt Capability: Integrated interrupt output with POR feature
• Physical Form Factor: 20-TSSOP surface mount package with identical pin configuration
• Environmental Compliance: ROHS3 compliance and MSL Level 1 rating

The PCF8574APWR meets all substitution criteria as it shares identical electrical specifications, package geometry, and functional characteristics with the discontinued PCF8574APWRG4.

Parameter Comparison

Engineering Selection Recommendations

The PCF8574APWR is the direct substitute for the discontinued PCF8574APWRG4. Both parts are manufactured by Texas Instruments and maintain identical electrical, mechanical, and environmental specifications. The PCF8574APWR is currently in active production with substantial inventory availability (38,350 pcs), ensuring supply chain continuity.

Both parts comply with ROHS3 standards and carry MSL Level 1 rating, meeting regulatory and environmental requirements for industrial and commercial applications. The packaging format (20-TSSOP) and pin configuration are identical, enabling direct board-level replacement without design modification.

Frequently Asked Questions (FAQ)

Q: Can the PCF8574APWR be used as a direct replacement for the PCF8574APWRG4?

A: Yes. Both parts are electrically and mechanically identical. The PCF8574APWR shares the same I/O count (8), interface protocol (I2C 100 kHz), output characteristics (push-pull, 1mA/25mA), supply voltage range (2.5V–6V), operating temperature range (–40°C to 85°C), and 20-TSSOP package geometry. No circuit modifications are required.

Q: What is the difference between the PCF8574APWRG4 and PCF8574APWR part numbers?

A: The suffix designations reflect packaging and distribution formats. The PCF8574APWRG4 was supplied in a specific packaging configuration now discontinued. The PCF8574APWR is the active equivalent available in Cut Tape (CT) and Digi-Reel® formats, ensuring continued availability for production environments.

Q: Are there any compliance or certification differences between these parts?

A: No. Both parts maintain identical ROHS3 compliance status, MSL Level 1 rating, REACH unaffected status, and ECCN/HTSUS classifications. Environmental and regulatory requirements are fully equivalent.

Q: What is the inventory status of the substitute part?

A: The PCF8574APWR is in active production with 38,350 pcs currently in stock, compared to the discontinued PCF8574APWRG4. This ensures reliable supply availability for immediate procurement.

Q: Are pin configurations identical between the two parts?

A: Yes. Both parts use the 20-TSSOP package with identical pin assignments, electrical characteristics per pin, and functional behavior. PCB layouts and firmware implementations require no modification.