PCF8574ADWE4 Equivalent & Substitute Parts

Part Overview

The PCF8574ADWE4 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 PCF8574ADWE4 provides 8 programmable I/O lines with push-pull output configuration, interrupt capability, and power-on reset functionality, suitable for applications requiring I2C-based port expansion in embedded systems.

Substiute Parts

PCF8574ADWE4

Texas InstrumentsIn Stock: 802PCF8574ADWE4 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

Substitution for the PCF8574ADWE4 is determined by strict equivalence across the following critical parameters: base product number (PCF8574), number of I/O (8), I2C interface at 100 kHz clock frequency, voltage supply range (2.5V ~ 6V), operating temperature range (-40°C ~ 85°C), output type (push-pull), interrupt output capability, and 16-SOIC package configuration. All substitute parts maintain identical electrical and mechanical specifications, ensuring direct functional replacement without circuit modification. Packaging format (tube, cut tape, or reel) represents the only variable among qualified substitutes and does not affect electrical performance or compatibility.

Parameter Comparison

Engineering Selection Recommendations

The PCF8574ADWR is the primary substitute for new designs and production applications. This part maintains active product status with Texas Instruments, ensuring long-term availability and supply chain stability. The PCF8574ADWR is supplied in Cut Tape and Digi-Reel format, optimizing automated assembly processes and inventory management.

The PCF8574ADW provides an alternative substitute with identical electrical specifications and ROHS3 compliance. This part is supplied in tube packaging and carries obsolete product status, making it suitable for legacy system maintenance or applications where existing inventory must be depleted.

Both substitute parts are fully compatible with the PCF8574ADWE4 at the circuit level, requiring no design modifications or firmware changes. Selection between PCF8574ADWR and PCF8574ADW should be based on packaging requirements, supply availability, and production volume considerations.

Frequently Asked Questions (FAQ)

Q: Can PCF8574ADW or PCF8574ADWR be used as direct replacements for PCF8574ADWE4 without circuit modification?

A: Yes. All three parts share identical electrical specifications, including I2C interface, 100 kHz clock frequency, 8 I/O configuration, voltage supply range (2.5V ~ 6V), operating temperature range (-40°C ~ 85°C), and 16-SOIC package dimensions. Direct pin-for-pin substitution is supported without design changes.

Q: What is the difference between PCF8574ADWE4, PCF8574ADW, and PCF8574ADWR?

A: The primary differences are packaging format and product status. PCF8574ADWE4 uses standard packaging and is obsolete. PCF8574ADW is supplied in tube format and is obsolete. PCF8574ADWR is supplied in Cut Tape and Digi-Reel format and maintains active product status. Electrical performance is identical across all three variants.

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

A: PCF8574ADWR is recommended for new designs due to its active product status, ensuring continued availability and supply chain support from Texas Instruments.

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

A: No. All three parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity level (MSL 1 - Unlimited) and regulatory classifications (ECCN: EAR99, HTSUS: 8542.39.0001).

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. The 16-SOIC package dimensions (0.295", 7.50mm width) are identical across all variants, supporting direct PCB footprint compatibility without layout modifications.