PCF8575CDWE4 Equivalent & Substitute Parts

Part Overview

The PCF8575CDWE4 is a 16-bit I/O Expander designed for I2C and SMBus communication at 400 kHz clock frequency. This interface component operates within the 4.5V to 5.5V supply voltage range and features open drain output configuration with interrupt output capability. The PCF8575CDWE4 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Identifying compatible alternatives ensures design continuity and supply chain reliability.

Substiute Parts

PCF8575CDWE4

Texas InstrumentsIn Stock: 1210PCF8575CDWE4 Datasheet

Current PartRFQ

PCF8575CDW

Texas InstrumentsIn Stock: 3400PCF8575CDW Datasheet

MFR RecommendedRFQ

PCF8575DBR

Texas InstrumentsIn Stock: 16933PCF8575DBR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCF8575CDWE4 are identified based on strict electrical and mechanical compatibility criteria. The primary substitution logic is based on the following parameters:

Critical Substitution Parameters:

• Number of I/O: 16 bits (must match exactly)
• Interface Protocol: I2C and SMBus (must match exactly)
• Clock Frequency: 400 kHz (must match exactly)
• Operating Temperature Range: -40°C ~ 85°C (must match exactly)
• RoHS Compliance: ROHS3 Compliant (must match exactly)

Secondary Compatibility Considerations:

• Base Product Number: PCF8575 series
• Mounting Type: Surface Mount
• Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts may differ in the following parameters without affecting functional compatibility in the PCF8575CDWE4 application:

• Package configuration (24-SOIC versus 24-SSOP)
• Output Type (Open Drain versus Push-Pull)
• Supply Voltage range (4.5V ~ 5.5V versus 2.5V ~ 5.5V)
• Current output specifications (10mA, 25mA versus 1mA, 25mA)
• Product Status (Obsolete versus Active)

Parameter Comparison

Engineering Selection Recommendations

PCF8575CDW Substitution: The PCF8575CDW is a direct functional equivalent to the PCF8575CDWE4. Both parts share identical electrical specifications including 16-bit I/O configuration, I2C/SMBus 400 kHz interface, 4.5V to 5.5V supply voltage, open drain output type, and -40°C to 85°C operating temperature range. Both are classified as obsolete. The PCF8575CDW is packaged in 24-SOIC format matching the PCF8575CDWE4. This substitute provides the highest level of compatibility for direct replacement in existing designs. Current inventory availability is 3300 pieces.

PCF8575DBR Substitution: The PCF8575DBR is a functional equivalent with design considerations. This part maintains the same 16-bit I/O count, I2C/SMBus 400 kHz interface, and -40°C to 85°C operating temperature range. The PCF8575DBR differs in three key aspects: (1) Active product status versus obsolete, (2) Push-Pull output type versus open drain, and (3) 24-SSOP package versus 24-SOIC package. The PCF8575DBR supports an extended supply voltage range of 2.5V to 5.5V. This substitute is suitable for new designs requiring an active product with extended voltage capability. Current inventory availability is 16840 pieces.

Frequently Asked Questions (FAQ)

Q: Can PCF8575CDW replace PCF8575CDWE4 in existing designs?

A: Yes. The PCF8575CDW is a direct substitute. Both parts feature identical electrical specifications: 16-bit I/O, I2C/SMBus 400 kHz operation, 4.5V to 5.5V supply voltage, open drain output, and -40°C to 85°C operating temperature. Both are packaged in 24-SOIC format. No circuit modifications are required.

Q: What are the key differences between PCF8575DBR and PCF8575CDWE4?

A: The PCF8575DBR differs in three parameters: (1) Package format is 24-SSOP instead of 24-SOIC, requiring PCB layout changes; (2) Output type is Push-Pull instead of open drain, affecting circuit design; (3) Supply voltage range is 2.5V to 5.5V instead of 4.5V to 5.5V, providing extended low-voltage capability. All other electrical specifications including I/O count, interface protocol, and operating temperature are identical.

Q: Is PCB layout modification required when substituting PCF8575DBR for PCF8575CDWE4?

A: Yes. The PCF8575DBR uses 24-SSOP packaging (0.209" width) while the PCF8575CDWE4 uses 24-SOIC packaging (0.295" width). These packages have different pin pitch and footprint dimensions, requiring PCB redesign. The 24-SSOP format is more compact than 24-SOIC.

Q: Can PCF8575DBR be used in applications requiring open drain output?

A: No. The PCF8575DBR features Push-Pull output type, while the PCF8575CDWE4 features open drain output. These output configurations have different electrical characteristics and circuit behavior. Applications specifically designed for open drain output require the PCF8575CDW substitute or equivalent open drain variants.

Q: What is the supply voltage compatibility between substitutes?

A: The PCF8575CDWE4 and PCF8575CDW both operate at 4.5V to 5.5V supply voltage. The PCF8575DBR supports an extended range of 2.5V to 5.5V. All three parts are compatible with standard 5V supply systems. The PCF8575DBR provides additional flexibility for lower voltage applications.

Q: Are all three parts ROHS3 compliant?

A: Yes. The PCF8575CDWE4, PCF8575CDW, and PCF8575DBR are all ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited). All parts meet environmental compliance requirements for industrial and commercial applications.

Q: Which substitute has the best current availability?

A: The PCF8575DBR has the highest inventory with 16840 pieces in stock. The PCF8575CDW has 3300 pieces available. The PCF8575CDWE4 has 1149 pieces in stock. For supply chain continuity, the PCF8575DBR offers the most reliable availability.