PCF8574DWRE4 Equivalent & Substitute Parts

Part Overview

The PCF8574DWRE4 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 component is classified as Obsolete, which necessitates identification of active equivalent parts for new designs and ongoing production requirements. The functional characteristics—8 I/O lines, I2C communication protocol, push-pull output configuration, and operating voltage range of 2.5V to 6V—define the substitution criteria for this interface component.

Substiute Parts

PCF8574DWRE4

Texas InstrumentsIn Stock: 1074PCF8574DWRE4 Datasheet

Current PartRFQ

PCF8574DWR

Texas InstrumentsIn Stock: 104771PCF8574DWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCF8574DWRE4 is determined by strict equivalence across the following critical parameters:

• I/O Configuration: 8 I/O lines (non-negotiable for pin-compatible replacement)
• Interface Protocol: I2C at 100 kHz clock frequency
• Electrical Characteristics: Push-pull output type with 1mA and 25mA source/sink current ratings
• Supply Voltage: 2.5V to 6V operating range
• Temperature Range: -40°C to 85°C
• Package Format: 16-SOIC surface mount package with identical pinout
• Compliance: ROHS3 compliance and REACH unaffected status

The PCF8574DWR meets all substitution criteria as an active product variant of the same base product number (PCF8574) with identical electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The PCF8574DWR is the direct functional equivalent for PCF8574DWRE4 replacement. Both parts share the same base product number (PCF8574) and are manufactured by Texas Instruments with identical electrical specifications and package geometry. The primary distinction is product status: PCF8574DWRE4 is obsolete while PCF8574DWR maintains active production status.

For new designs and production continuity, PCF8574DWR is the appropriate selection. Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment. The packaging difference (PCF8574DWRE4 supplied in standard packaging versus PCF8574DWR available in Cut Tape and Digi-Reel formats) does not affect electrical or mechanical compatibility—only supply chain logistics.

Frequently Asked Questions (FAQ)

Q: Can PCF8574DWR directly replace PCF8574DWRE4 in existing designs?

A: Yes. Both parts are electrically and mechanically identical with matching pinout, I/O configuration, I2C protocol, voltage range, temperature range, and output characteristics. No circuit modifications are required.

Q: What is the difference between PCF8574DWRE4 and PCF8574DWR?

A: The primary difference is product status. PCF8574DWRE4 is obsolete; PCF8574DWR is active production. Packaging format differs (standard versus Cut Tape/Digi-Reel), but electrical and mechanical specifications are identical.

Q: Are there any compliance or certification differences?

A: No. Both parts maintain ROHS3 compliance and REACH unaffected status. Regulatory requirements are equivalent.

Q: Does the 16-SOIC package remain the same?

A: Yes. Both parts use the identical 16-SOIC package with 0.295" width (7.50mm). PCB footprints and assembly processes require no modification.

Q: What inventory considerations apply to this substitution?

A: PCF8574DWR has significantly higher inventory availability (104,736 pcs) compared to PCF8574DWRE4 (1,028 pcs), making it the preferred choice for production planning and supply chain continuity.