PCF8574ADWG4 Equivalent & Substitute Parts

Part Overview

The PCF8574ADWG4 is an 8-bit I/O expander with I2C interface operating at 100 kHz, manufactured by Texas Instruments in a 16-SOIC surface mount package. This part is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The device provides 8 programmable I/O lines with push-pull output configuration, suitable for applications requiring I2C-based port expansion with interrupt capability.

Substiute Parts

PCF8574ADWG4

Texas InstrumentsIn Stock: 1202PCF8574ADWG4 Datasheet

Current PartRFQ

PCF8574ADW

Texas InstrumentsIn Stock: 1715PCF8574ADW Datasheet

MFR RecommendedRFQ

PCF8574ADWR

Texas InstrumentsIn Stock: 5469PCF8574ADWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCF8574ADWG4 are qualified based on matching the following critical parameters:

• Number of I/O: 8 channels
• Interface Protocol: I2C at 100 kHz
• Voltage Supply Range: 2.5V ~ 6V
• Operating Temperature Range: -40°C ~ 85°C
• Output Configuration: Push-Pull
• Current Specifications: 1mA, 25mA source/sink
• Package Type: 16-SOIC surface mount
• Interrupt Output: Present
• Power-On Reset Feature: Included

The identified substitute parts maintain identical electrical and mechanical specifications, ensuring functional compatibility in applications currently using the PCF8574ADWG4.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using PCF8574ADWG4, the PCF8574ADWR is the preferred substitute due to its active product status. This part maintains full electrical and mechanical compatibility while ensuring long-term availability and supply chain continuity.

The PCF8574ADW remains a valid substitute with identical specifications but carries obsolete product status, similar to the original part. Selection of this variant should be limited to applications where existing inventory is available or where supply constraints necessitate its use.

All substitute parts maintain ROHS3 compliance and identical moisture sensitivity ratings, ensuring compatibility with current manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can PCF8574ADW or PCF8574ADWR be used as direct replacements for PCF8574ADWG4?

A: Yes. Both parts are direct functional equivalents with identical electrical specifications, I/O configuration, I2C interface parameters, voltage supply range, operating temperature range, and 16-SOIC package dimensions. No circuit modifications are required.

Q: What is the difference between the three parts?

A: The primary difference is product status. PCF8574ADWR is active and recommended for new designs. PCF8574ADW and PCF8574ADWG4 are both obsolete. All three share identical electrical and mechanical parameters.

Q: Are there packaging differences between these parts?

A: The parts differ in packaging format. PCF8574ADWG4 uses standard packaging, PCF8574ADW is supplied in Tube packaging, and PCF8574ADWR is supplied in Cut Tape (CT) & Digi-Reel format. The physical component package remains 16-SOIC in all cases.

Q: Do these parts require different PCB layouts or footprints?

A: No. All three parts use the 16-SOIC (0.295", 7.50mm Width) package, requiring identical PCB footprints and layout considerations.

Q: Are compliance certifications identical across all three parts?

A: Yes. All parts are ROHS3 compliant, REACH unaffected, carry ECCN EAR99 classification, and have MSL rating of 1 (Unlimited).