PCF8575DBQR Equivalent & Substitute Parts

Part Overview

The PCF8575DBQR is a 16-bit I/O Expander interface component manufactured by Texas Instruments, designed for I2C and SMBus communication at 400 kHz clock frequency. This device operates across a supply voltage range of 2.5V to 5.5V and is housed in a 24-SSOP surface mount package. The component features push-pull output configuration with interrupt output capability and Power-On Reset (POR) functionality.

The PCF8575DBQR maintains Active product status with full RoHS3 compliance and REACH unaffected designation. Substitute parts are identified when equivalent electrical and mechanical parameters are required for design flexibility, inventory management, or packaging format changes while maintaining functional compatibility within the I/O expander interface category.

Substiute Parts

PCF8575DBQR

Texas InstrumentsIn Stock: 2180PCF8575DBQR Datasheet

Current PartRFQ

PCF8575PWR

Texas InstrumentsIn Stock: 19433PCF8575PWR Datasheet

MFR RecommendedRFQ

MAX7313AEG+

Analog Devices Inc./Maxim IntegratedIn Stock: 2060MAX7313AEG+ Datasheet

MFR RecommendedRFQ

MAX7313AEG+T

Analog Devices Inc./Maxim IntegratedIn Stock: 8167MAX7313AEG+T Datasheet

MFR RecommendedRFQ

MCP23016-I/SP

Microchip TechnologyIn Stock: 1000417MCP23016-I/SP Datasheet

MFR RecommendedRFQ

MCP23016T-I/ML

Microchip TechnologyIn Stock: 3798MCP23016T-I/ML Datasheet

MFR RecommendedRFQ

MCP23016T-I/SO

Microchip TechnologyIn Stock: 3494MCP23016T-I/SO Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCF8575DBQR are classified based on the following critical parameters that determine functional and mechanical compatibility:

Primary Substitution Criteria:

• Number of I/O: 16 (mandatory match)
• Clock Frequency: 400 kHz (mandatory match)
• Interface Protocol: I2C or I2C/SMBus (I2C is baseline requirement)
• Interrupt Output: Yes (mandatory match)
• Product Status: Active (mandatory match)
• RoHS3 Compliance: Required

Secondary Compatibility Factors:

• Voltage Supply Range: Overlap required within operating conditions
• Operating Temperature Range: Minimum -40°C to 85°C coverage
• Output Type: Push-Pull or Open Drain (functional equivalence)
• Current Output Capability: Minimum 25mA sink/source
• Mounting Type: Surface Mount or Through Hole (application dependent)
• Package Format: Varies by application requirements

Substitutes are organized by manufacturer and package type. All listed substitutes maintain the 16-bit I/O configuration and 400 kHz I2C communication standard required for direct functional replacement.

Parameter Comparison

Engineering Selection Recommendations

Texas Instruments PCF8575 Series (Same Manufacturer)

The PCF8575PWR represents a direct manufacturer alternative within the same product family. Both PCF8575DBQR and PCF8575PWR share identical electrical specifications including 16-bit I/O configuration, 400 kHz I2C/SMBus interface, push-pull output, and -40°C to 85°C operating range. The primary difference is packaging format: PCF8575DBQR uses 24-SSOP (0.154" width) while PCF8575PWR uses 24-TSSOP (0.173" width). Both maintain RoHS3 compliance and Active product status. Selection between these variants depends on PCB layout constraints and available board space for the specific package footprint.

Analog Devices Inc./Maxim Integrated MAX7313 Series

The MAX7313AEG+ and MAX7313AEG+T provide functional I/O expansion with 16-bit configuration and 400 kHz I2C/SMBus operation. These devices feature open-drain output configuration and higher current capability (50mA) compared to the PCF8575DBQR. The MAX7313 series operates across a narrower supply voltage range (2V to 3.6V) and supports extended operating temperature to 125°C. Both variants maintain RoHS3 compliance and Active status. MAX7313AEG+ is supplied in tube packaging, while MAX7313AEG+T is supplied in cut tape format. Selection requires verification that the 2V to 3.6V supply range and open-drain output topology are compatible with the target application.

Microchip Technology MCP23016 Series

The MCP23016 family offers three package variants: MCP23016-I/SP (28-DIP through-hole), MCP23016T-I/ML (28-QFN surface mount), and MCP23016T-I/SO (28-SOIC surface mount). All variants provide 16-bit I/O expansion with 400 kHz I2C interface, push-pull output, and POR functionality. The MCP23016 series operates across 2V to 5.5V supply range and -40°C to 85°C temperature range, matching the PCF8575DBQR electrical envelope. The 28-pin package format accommodates additional functionality compared to the 24-pin PCF8575. All MCP23016 variants maintain RoHS3 compliance and Active product status. Selection among MCP23016 variants depends on mounting requirements: through-hole for legacy designs (MCP23016-I/SP), compact surface mount for space-constrained applications (MCP23016T-I/ML), or standard SOIC for conventional PCB assembly (MCP23016T-I/SO).

Frequently Asked Questions (FAQ)

Q: Can the PCF8575PWR directly replace the PCF8575DBQR on an existing PCB?

A: Direct PCB replacement requires package compatibility verification. The PCF8575DBQR uses 24-SSOP (0.154" width) while PCF8575PWR uses 24-TSSOP (0.173" width). Both packages have different footprints and pin spacing. PCB layout modification is necessary for physical substitution. Electrical functionality is identical between these variants.

Q: What is the primary difference between push-pull and open-drain output configurations?

A: Push-pull output (PCF8575DBQR, MCP23016 series) actively drives the output line high or low through internal transistor pairs. Open-drain output (MAX7313 series) can only pull the line low; the line floats high through an external pull-up resistor. Open-drain configuration requires external pull-up resistors on I/O lines and is suitable for multi-master I2C bus applications. Push-pull output does not require external pull-up resistors for standard operation.

Q: Are the MAX7313AEG+ and MAX7313AEG+T electrically identical?

A: Yes, MAX7313AEG+ and MAX7313AEG+T are electrically identical. The difference is packaging format: MAX7313AEG+ is supplied in tube packaging, while MAX7313AEG+T is supplied in cut tape and digi-reel format. Both maintain identical electrical specifications, RoHS3 compliance, and Active product status.

Q: Can I use the MCP23016-I/SP (through-hole DIP) in place of the PCF8575DBQR (surface mount SSOP)?

A: The MCP23016-I/SP and PCF8575DBQR are not mechanically interchangeable due to different mounting types and package formats. MCP23016-I/SP is a 28-pin through-hole DIP package, while PCF8575DBQR is a 24-pin surface mount SSOP package. However, both provide equivalent 16-bit I/O expansion functionality with 400 kHz I2C interface and can be used as functional alternatives in different PCB designs.

Q: What supply voltage range is compatible with all substitute parts?

A: No single voltage range covers all substitutes. The PCF8575DBQR and MCP23016 series operate at 2.5V to 5.5V (or 2V to 5.5V for MCP23016). The MAX7313 series operates at a narrower range of 2V to 3.6V. For applications requiring 5V operation, the PCF8575DBQR, PCF8575PWR, and MCP23016 series are suitable. For 3.3V or lower supply voltages, all listed parts are compatible.

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

A: The MAX7313AEG+ and MAX7313AEG+T provide 50mA output current capability, which is higher than the PCF8575DBQR (25mA maximum) and MCP23016 series (25mA maximum). Selection of MAX7313 variants is appropriate for applications requiring higher drive current on I/O lines.

Q: Are all listed substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts including PCF8575DBQR, PCF8575PWR, MAX7313AEG+, MAX7313AEG+T, MCP23016-I/SP, MCP23016T-I/ML, and MCP23016T-I/SO maintain RoHS3 compliance and REACH unaffected status.

Q: What is the difference between the MCP23016T-I/ML and MCP23016T-I/SO packages?

A: MCP23016T-I/ML uses a 28-QFN (6x6) package with exposed pad, providing compact surface mount footprint suitable for space-constrained applications. MCP23016T-I/SO uses a 28-SOIC package, which is a larger but more conventional surface mount format. Both provide identical electrical functionality and are supplied in cut tape format. Package selection depends on available PCB space and assembly equipment compatibility.