PCF8575CDB Equivalent & Substitute Parts

Part Overview

The PCF8575CDB is a 16-bit I/O expander with I2C and SMBus interface operating at 400 kHz, manufactured by Texas Instruments in a 24-SSOP package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The PCF8575CDB provides open-drain output configuration with 10mA source and 25mA sink current capability, operating across a 4.5V to 5.5V supply range and -40°C to 85°C temperature range.

Substiute Parts

PCF8575CDB

Texas InstrumentsIn Stock: 858PCF8575CDB 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 for the PCF8575CDB is determined by the following critical parameters:

Core Functional Requirements:

• 16-bit I/O count
• I2C and SMBus protocol support
• 400 kHz clock frequency
• 24-pin SSOP or TSSOP package

Electrical Compatibility Criteria:

• Supply voltage range must encompass or exceed the original 4.5V ~ 5.5V specification
• Output type (open-drain vs. push-pull) affects circuit design but does not prevent substitution if pull-up resistors are appropriately configured
• Current source/sink ratings must meet or exceed application requirements
• Operating temperature range must support the -40°C ~ 85°C specification

Packaging Considerations:

• 24-SSOP (0.209" width) is the primary package form
• 24-TSSOP (0.173" width) represents a narrower variant with identical pin count and compatible pinout

Substitute parts are grouped into two categories: direct replacements from Texas Instruments (PCF8575DBR) and cross-manufacturer alternatives (MAX7311AAG+, MAX7311AAG+T, NCT5655W, XRA1201IG24TR-F) that meet the functional and electrical requirements.

Parameter Comparison

Engineering Selection Recommendations

PCF8575DBR (Texas Instruments): This is the direct successor from the original manufacturer. It maintains the same 24-SSOP package and functional specifications as the PCF8575CDB. The primary difference is the output type change from open-drain to push-pull, which requires circuit design verification. Supply voltage range is expanded to 2.5V ~ 5.5V, providing greater flexibility. Product status is active with substantial inventory availability (16,840 pcs). This part is recommended for designs requiring minimal redesign effort and manufacturer continuity.

MAX7311AAG+ and MAX7311AAG+T (Analog Devices Inc./Maxim Integrated): Both variants provide identical electrical specifications with push-pull output configuration and higher current drive capability (31mA source, 43mA sink). Operating temperature range extends to 125°C. The primary difference between these parts is packaging: MAX7311AAG+ is supplied in tube format, while MAX7311AAG+T is supplied in tape and reel format. Supply voltage range is 2V ~ 5.5V. These parts are suitable for applications requiring extended temperature operation or higher output current. Both maintain ROHS3 compliance and active product status.

NCT5655W (Nuvoton Technology Corporation): This part operates with open-drain output configuration, matching the original PCF8575CDB output type. It is supplied in 24-TSSOP package (0.173" width), which is narrower than the 24-SSOP. Supply voltage range is 2.3V ~ 5.5V. The part includes LED output features and maintains active product status with ROHS3 compliance. This option is suitable for designs where open-drain output is required and package width constraints permit the TSSOP variant.

XRA1201IG24TR-F (MaxLinear, Inc.): This part operates across a lower supply voltage range (1.65V ~ 3.6V) and is packaged in 24-TSSOP format. Output type and current specifications are not provided in the available data. This part is suitable only for applications operating at supply voltages below 4.5V and where the narrower TSSOP package is acceptable. Product status is active with the highest inventory availability (3,618 pcs).

Frequently Asked Questions (FAQ)

Q: Can PCF8575DBR directly replace PCF8575CDB without circuit modifications?

A: PCF8575DBR is functionally compatible but requires circuit design review. The primary difference is output type: PCF8575CDB uses open-drain output while PCF8575DBR uses push-pull output. Open-drain outputs require external pull-up resistors; push-pull outputs do not. If the original design includes pull-up resistors, PCF8575DBR can operate without modification. If the original design relies on open-drain characteristics, pull-up resistor configuration must be verified.

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

A: Both parts are electrically identical with the same pin configuration, voltage ratings, and current specifications. The difference is packaging format: MAX7311AAG+ is supplied in tube packaging, while MAX7311AAG+T is supplied in tape and reel format. Selection depends on production volume and assembly line requirements.

Q: Why does XRA1201IG24TR-F have a lower supply voltage range than the original PCF8575CDB?

A: XRA1201IG24TR-F is designed for low-voltage applications with a 1.65V ~ 3.6V supply range. This part is not suitable for applications requiring the original 4.5V ~ 5.5V supply voltage specification. Use this part only in designs where supply voltage remains within the 1.65V ~ 3.6V range.

Q: Can I use a 24-TSSOP package part as a substitute for a 24-SSOP package part?

A: 24-TSSOP and 24-SSOP packages have identical pin counts and compatible pinouts, but differ in physical dimensions. 24-TSSOP (0.173" width) is narrower than 24-SSOP (0.209" width). Substitution is possible if the PCB layout and component placement accommodate the narrower package width. Verify footprint compatibility before design implementation.

Q: Which substitute part has the highest current output capability?

A: MAX7311AAG+ and MAX7311AAG+T both provide 31mA source and 43mA sink current, which exceeds the original PCF8575CDB specification of 10mA source and 25mA sink. These parts are suitable for applications requiring higher output current drive.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed maintain RoHS compliance. PCF8575DBR, MAX7311AAG+, MAX7311AAG+T, and NCT5655W are ROHS3 compliant. XRA1201IG24TR-F is RoHS compliant. All parts meet environmental and regulatory requirements for commercial and industrial applications.