PCF8574APW Equivalent & Substitute Parts

Part Overview

The PCF8574APW 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 component is classified as Obsolete, which necessitates identification of active equivalent parts for new designs and ongoing production requirements. The PCF8574APW provides push-pull output capability with interrupt functionality and operates across a 2.5V to 6V supply voltage range, making it suitable for embedded systems requiring expanded I/O capabilities with minimal pin count.

Substiute Parts

PCF8574APW

Texas InstrumentsIn Stock: 38355PCF8574APW Datasheet

Current PartRFQ

PCF8574APWR

Texas InstrumentsIn Stock: 38385PCF8574APWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCF8574APW is determined by strict equivalence across the following critical parameters:

• I/O Configuration: 8-bit I/O expander
• Communication Protocol: I2C at 100 kHz clock frequency
• Electrical Specifications: 2.5V to 6V supply voltage, push-pull output with 1mA/25mA source/sink capability
• Physical Package: 20-TSSOP surface mount package with identical pinout
• Functional Features: Interrupt output capability and Power-On Reset (POR)
• Temperature Range: -40°C to 85°C operating specification

The PCF8574APWR meets all these criteria as a direct functional equivalent, with the primary distinction being packaging format (Cut Tape & Digi-Reel versus Tube) and product status (Active versus Obsolete).

Parameter Comparison

Engineering Selection Recommendations

The PCF8574APWR is the direct substitute for the obsolete PCF8574APW. Both components share identical electrical specifications, pinout, and functional capabilities. The PCF8574APWR maintains Active product status, ensuring continued availability and manufacturing support. Both parts comply with ROHS3 and REACH requirements, with equivalent moisture sensitivity ratings. The substitution involves no functional or electrical trade-offs; the difference is limited to packaging format and product lifecycle status. For new designs and production continuity, the PCF8574APWR is the appropriate selection.

Frequently Asked Questions (FAQ)

Q: Are PCF8574APW and PCF8574APWR pin-compatible?

A: Yes. Both components use the 20-TSSOP package with identical pinout and electrical characteristics. No circuit modifications are required for substitution.

Q: What is the difference between Tube and Cut Tape packaging?

A: Tube packaging (PCF8574APW) is used for lower-volume applications, while Cut Tape & Digi-Reel packaging (PCF8574APWR) is standard for higher-volume production. The components are electrically and functionally identical.

Q: Can I use PCF8574APWR in existing designs specified for PCF8574APW?

A: Yes. The PCF8574APWR is a direct functional equivalent with no design changes required. Verify packaging compatibility with your assembly process.

Q: Why is PCF8574APW marked as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The PCF8574APWR remains in active production and is the recommended replacement.

Q: Are there any compliance differences between these parts?

A: No. Both parts are ROHS3 Compliant and REACH Unaffected with identical moisture sensitivity levels (MSL 1).

Q: What is the I2C clock frequency specification?

A: Both parts operate at 100 kHz I2C clock frequency, suitable for standard I2C bus applications.

Q: Can these parts operate at different supply voltages?

A: Both parts operate across the 2.5V to 6V supply range. Ensure your application supply voltage falls within this specification.