PCF8574APWG4 Equivalent & Substitute Parts

Part Overview

The PCF8574APWG4 is an 8-bit I/O expander with I2C interface operating at 100 kHz, manufactured by Texas Instruments in a 20-TSSOP surface mount package. This part is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The PCF8574APWG4 provides push-pull output capability with configurable source/sink current and is suitable for applications requiring remote I/O expansion over I2C bus architecture.

Substiute Parts

PCF8574APWG4

Texas InstrumentsIn Stock: 836PCF8574APWG4 Datasheet

Current PartRFQ

PCF8574APW

Texas InstrumentsIn Stock: 38355PCF8574APW Datasheet

MFR RecommendedRFQ

PCF8574APWR

Texas InstrumentsIn Stock: 38385PCF8574APWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCF8574APWG4 are qualified based on the following electrical and mechanical parameters:

• I/O Configuration: 8-bit I/O expander
• Communication Protocol: I2C interface at 100 kHz clock frequency
• Electrical Specifications: Supply voltage 2.5V ~ 6V, output type push-pull with 1mA and 25mA source/sink capability
• Thermal Range: Operating temperature -40°C ~ 85°C
• Package Compatibility: 20-TSSOP surface mount package with identical physical dimensions
• Compliance: ROHS3 compliant, REACH unaffected status

The substitute parts PCF8574APW and PCF8574APWR meet all these criteria and share the same base product number (PCF8574), ensuring functional and mechanical interchangeability.

Parameter Comparison

Engineering Selection Recommendations

Both PCF8574APW and PCF8574APWR are direct functional equivalents to the PCF8574APWG4. Selection between these substitutes should be based on product status and supply chain considerations:

PCF8574APWR is the preferred selection for new designs and long-term production applications. This part carries active product status from Texas Instruments, ensuring continued manufacturing support and availability. It is supplied in Cut Tape and Digi-Reel® packaging formats, suitable for both manual assembly and automated pick-and-place operations.

PCF8574APW is available as an alternative with tube packaging. This part maintains obsolete status, consistent with the original PCF8574APWG4, and should be evaluated based on specific inventory and supply requirements.

Both parts maintain identical electrical specifications, thermal performance, and compliance certifications (ROHS3, REACH unaffected), ensuring seamless integration into existing circuit designs without modification.

Frequently Asked Questions (FAQ)

Q: Can PCF8574APW or PCF8574APWR be used as direct replacements for PCF8574APWG4?

A: Yes. Both substitute parts share identical electrical parameters, including I/O count, I2C interface frequency, supply voltage range, operating temperature range, output type, and current specifications. The 20-TSSOP package dimensions are identical, enabling direct PCB footprint compatibility.

Q: What is the difference between PCF8574APW and PCF8574APWR?

A: The primary differences are product status and packaging format. PCF8574APWR maintains active product status with Cut Tape and Digi-Reel® packaging options, while PCF8574APW is supplied in tube packaging and carries obsolete status. Both parts are electrically and mechanically identical.

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

A: No. All three parts (PCF8574APWG4, PCF8574APW, and PCF8574APWR) are ROHS3 compliant and REACH unaffected, meeting identical environmental and regulatory requirements.

Q: Does the packaging format affect electrical performance?

A: No. Packaging format (tube, cut tape, or digi-reel) affects only handling, storage, and assembly processes. Electrical performance and specifications remain identical across all packaging options.

Q: Which part should be selected for new production designs?

A: PCF8574APWR is recommended for new designs due to its active product status, ensuring long-term availability and manufacturing support from Texas Instruments.