PCF8575CDBR Equivalent & Substitute Parts

Part Overview

The PCF8575CDBR is a 16-bit I/O expander interface circuit designed for I2C and SMBus communication at 400 kHz. Manufactured by Texas Instruments, this component operates within a 4.5V to 5.5V supply range and features open-drain output configuration with 10mA/25mA source/sink capability. The device is currently classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements.

Substiute Parts

PCF8575CDBR

Texas InstrumentsIn Stock: 2099PCF8575CDBR Datasheet

Current PartRFQ

PCF8575DBR

Texas InstrumentsIn Stock: 16933PCF8575DBR Datasheet

MFR RecommendedRFQ

MAX7311AAG+

Analog Devices Inc./Maxim IntegratedIn Stock: 2315MAX7311AAG+ Datasheet

MFR RecommendedRFQ

MAX7311AAG+T

Analog Devices Inc./Maxim IntegratedIn Stock: 735MAX7311AAG+T Datasheet

MFR RecommendedRFQ

NCT5655W

Nuvoton Technology CorporationIn Stock: 846NCT5655W Datasheet

MFR RecommendedRFQ

XRA1201IG24TR-F

MaxLinear, Inc.In Stock: 3673XRA1201IG24TR-F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCF8575CDBR is determined by the following critical parameters:

Primary Compatibility Criteria:

• 16-bit I/O configuration
• I2C/SMBus interface protocol
• 400 kHz clock frequency operation
• 24-pin SSOP or TSSOP package footprint
• ROHS3 compliance

Secondary Consideration Parameters:

• Supply voltage range (minimum 4.5V operation required for direct replacement)
• Output type (open-drain vs. push-pull affects circuit design)
• Current drive capability (10mA/25mA baseline)
• Operating temperature range (-40°C ~ 85°C minimum)

Substitute parts are grouped into two categories: direct pin-compatible replacements from Texas Instruments and functionally equivalent alternatives from other manufacturers that maintain core I/O expansion and communication specifications.

Parameter Comparison

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Same Manufacturer):

PCF8575DBR is the primary substitute from Texas Instruments. This part maintains identical I/O count, interface protocol, clock frequency, and package footprint. The PCF8575DBR extends supply voltage compatibility to 2.5V minimum and features push-pull output configuration instead of open-drain. Both devices are ROHS3 compliant and active products. The output type difference requires circuit evaluation if the original design depends on open-drain characteristics.

Tier 2 - Functional Equivalents (Extended Temperature Range):

MAX7311AAG+T and MAX7311AAG+ from Analog Devices/Maxim Integrated provide 16-bit I/O expansion with I2C/SMBus 400 kHz operation in 24-SSOP packages. These devices support extended operating temperature to 125°C and offer higher current drive capability (31mA/43mA). Supply voltage range extends to 2V minimum. Both are active products with ROHS3 compliance. The push-pull output configuration differs from the original open-drain design. Packaging differs between tape & reel (MAX7311AAG+T) and tube (MAX7311AAG+).

Tier 3 - Alternative Package Options:

NCT5655W from Nuvoton Technology and XRA1201IG24TR-F from MaxLinear provide 16-bit I/O expansion in 24-TSSOP packages with reduced footprint width (4.40mm vs. 5.30mm). Both maintain 400 kHz I2C/SMBus operation and -40°C to 85°C temperature range. NCT5655W features open-drain output and ROHS3 compliance. XRA1201IG24TR-F operates at reduced voltage range (1.65V ~ 3.6V) and is not suitable for 4.5V ~ 5.5V applications. Both are active products.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and REACH unaffected status. Selection should prioritize active product status over obsolete classification for long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can PCF8575DBR directly replace PCF8575CDBR in existing designs?

A: PCF8575DBR is pin-compatible and functionally equivalent with one critical difference: output configuration changes from open-drain to push-pull. If the circuit design relies on open-drain characteristics (such as wired-OR configurations), circuit modification may be required. Supply voltage compatibility extends to 2.5V minimum, providing broader operational range than the original 4.5V minimum.

Q: What is the primary difference between MAX7311AAG+T and MAX7311AAG+?

A: Both parts are electrically identical 16-bit I/O expanders with identical electrical specifications. The difference is packaging format: MAX7311AAG+T is supplied in tape & reel format for automated assembly, while MAX7311AAG+ is supplied in tube format for manual handling. Selection depends on assembly process requirements.

Q: Why does XRA1201IG24TR-F have a different voltage range?

A: XRA1201IG24TR-F operates at 1.65V ~ 3.6V supply voltage, which is incompatible with the original PCF8575CDBR specification of 4.5V ~ 5.5V. This part is not suitable as a direct substitute for applications requiring 5V operation.

Q: What are the package differences between SSOP and TSSOP?

A: Both 24-SSOP and 24-TSSOP are 24-pin surface-mount packages with identical pin count and pitch. The primary difference is package width: 24-SSOP measures 5.30mm width while 24-TSSOP measures 4.40mm width. TSSOP provides reduced footprint for space-constrained applications. PCB layout modifications are required when switching between these packages.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts maintain ROHS3 compliance except XRA1201IG24TR-F, which carries RoHS Compliant designation without specific ROHS3 classification. Verify specific RoHS revision requirements for your application before final selection.

Q: Which substitute offers the highest current drive capability?

A: MAX7311AAG+ and MAX7311AAG+T provide the highest current output capability at 31mA source and 43mA sink, compared to the original PCF8575CDBR specification of 10mA source and 25mA sink. This increased capability may benefit applications requiring higher I/O drive current.