PCF8575TS/1,118 Equivalent & Substitute Parts

Part Overview

The PCF8575TS/1,118 is a 16-bit I/O expander interface circuit manufactured by NXP USA Inc., designed for I2C communication at 400 kHz. This surface-mount device in 24-SSOP packaging provides push-pull output capability with 10mA and 25mA source/sink current ratings, operating across a 2.5V to 5.5V supply range and -40°C to 85°C temperature range. The device includes power-on reset (POR) functionality and interrupt output capability. Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required for specific board layouts, or when design flexibility demands components from different manufacturers with compatible electrical and mechanical specifications.

Key Parameters

Parameter	Value
Number of I/O	16
Interface	I2C
Clock Frequency	400 kHz
Interrupt Output	Yes
Output Type	Push-Pull
Current - Output Source/Sink	10mA, 25mA
Voltage - Supply	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	24-SSOP (0.209", 5.30mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PCF8575TS/1,118 is determined by the following critical parameters: 16 I/O count, I2C interface protocol at 400 kHz clock frequency, push-pull output configuration, interrupt output capability, and compatible supply voltage range. Substitute parts must maintain these core electrical specifications. Packaging format variations (24-SSOP, 24-TSSOP, 24-WQFN, 28-SSOP, 28-SPDIP) represent mechanical alternatives suitable for different PCB design requirements. Supply voltage compatibility is evaluated based on overlap with the 2.5V to 5.5V range. Output current ratings of 10mA and 25mA establish the minimum performance threshold for source/sink capability. All substitute parts listed maintain ROHS3 compliance and operate within the -40°C to 85°C temperature specification.

Parameter Comparison

Part Number	Manufacturer	I/O Count	Interface	Clock Frequency	Output Type	Current (mA)	Supply Voltage	Package	Mounting Type	Product Status
PCF8575TS/1,118	NXP USA Inc.	16	I2C	400 kHz	Push-Pull	10, 25	2.5V ~ 5.5V	24-SSOP	Surface Mount	Active
PCF8575DBR	Texas Instruments	16	I2C, SMBus	400 kHz	Push-Pull	1, 25	2.5V ~ 5.5V	24-SSOP	Surface Mount	Active
PCF8575DB	Texas Instruments	16	I2C, SMBus	400 kHz	Push-Pull	10, 25	2.5V ~ 5.5V	24-SSOP	Surface Mount	Obsolete
MCP23016-I/SP	Microchip Technology	16	I2C	400 kHz	Push-Pull	25	2V ~ 5.5V	28-DIP	Through Hole	Active
MCP23016-I/SS	Microchip Technology	16	I2C	400 kHz	Push-Pull	25	2V ~ 5.5V	28-SSOP	Surface Mount	Active
TCA6416APWR	Texas Instruments	16	I2C, SMBus	400 kHz	Push-Pull	10, 25	1.65V ~ 5.5V	24-TSSOP	Surface Mount	Active
TCA6416ARTWR	Texas Instruments	16	I2C, SMBus	400 kHz	Push-Pull	10, 25	1.65V ~ 5.5V	24-WQFN (4x4)	Surface Mount	Active
TCA9535DBR	Texas Instruments	16	I2C, SMBus	400 kHz	Push-Pull	10, 25	1.65V ~ 5.5V	24-SSOP	Surface Mount	Active
TCA9535DBT	Texas Instruments	16	I2C, SMBus	400 kHz	Push-Pull	10, 25	1.65V ~ 5.5V	24-SSOP	Surface Mount	Active
TCA9535PWR	Texas Instruments	16	I2C, SMBus	400 kHz	Push-Pull	10, 25	1.65V ~ 5.5V	24-TSSOP	Surface Mount	Active
TCA9535RTWR	Texas Instruments	16	I2C, SMBus	400 kHz	Push-Pull	10, 25	1.65V ~ 5.5V	24-WQFN (4x4)	Surface Mount	Active

Engineering Selection Recommendations

For direct pin-compatible replacement in existing 24-SSOP surface-mount designs, PCF8575DBR and TCA9535DBR/TCA9535DBT provide equivalent functionality with active product status. PCF8575DBR maintains identical supply voltage specifications (2.5V ~ 5.5V) and output current ratings. TCA9535 series parts operate at a lower minimum supply voltage (1.65V) and are suitable for applications requiring extended low-voltage operation.

For designs requiring alternative packaging formats, TCA6416APWR and TCA9535PWR offer 24-TSSOP packages with reduced footprint dimensions (0.173" width versus 0.209"). TCA6416ARTWR and TCA9535RTWR provide 24-WQFN (4x4) packages for space-constrained applications, with TCA6416ARTWR and TCA9535RTWR rated at MSL 2 (1 Year) versus MSL 1 (Unlimited) for other variants.

For through-hole mounting requirements, MCP23016-I/SP in 28-DIP package provides an alternative, though this represents a different mounting technology. MCP23016-I/SS offers surface-mount compatibility in 28-SSOP package format with identical electrical specifications to the DIP variant.

PCF8575DB (Texas Instruments) is listed as obsolete and should not be selected for new designs despite electrical compatibility.

All listed substitute parts maintain ROHS3 compliance and operate within the -40°C to 85°C temperature range specified for the primary part.

Frequently Asked Questions (FAQ)

Q: Can PCF8575DBR directly replace PCF8575TS/1,118 in existing designs?

A: PCF8575DBR is electrically compatible as a direct substitute. Both devices feature 16 I/O, I2C 400 kHz interface, push-pull output, and identical supply voltage range (2.5V ~ 5.5V). The primary difference is the output source current specification (1mA versus 10mA minimum for PCF8575TS/1,118). Both use 24-SSOP packaging and maintain ROHS3 compliance.

Q: What is the difference between TCA6416APWR and TCA9535DBR?

A: Both devices provide 16 I/O, I2C/SMBus 400 kHz interface, and push-pull output with 10mA and 25mA current ratings. TCA6416APWR uses 24-TSSOP packaging (0.173" width), while TCA9535DBR uses 24-SSOP packaging (0.209" width). TCA6416APWR supports lower minimum supply voltage (1.65V versus 2.5V). Package selection depends on PCB layout requirements and available board space.

Q: Are MCP23016-I/SP and MCP23016-I/SS interchangeable with PCF8575TS/1,118?

A: Both MCP23016 variants provide equivalent 16 I/O, I2C 400 kHz interface, and push-pull output functionality. MCP23016-I/SP uses 28-DIP through-hole packaging, while MCP23016-I/SS uses 28-SSOP surface-mount packaging. These represent different mounting technologies and package footprints compared to the 24-SSOP format of PCF8575TS/1,118. Selection depends on board assembly method and available space.

Q: Why is PCF8575DB listed as obsolete?

A: PCF8575DB (Texas Instruments) carries obsolete product status and should not be selected for new designs. Active alternatives with identical electrical specifications include PCF8575DBR and TCA9535 series parts.

Q: What does MSL 2 (1 Year) mean for TCA6416ARTWR and TCA9535RTWR?

A: Moisture Sensitivity Level 2 (1 Year) indicates these components require storage in controlled humidity conditions and have a one-year shelf life from the date of manufacture. MSL 1 (Unlimited) parts such as PCF8575DBR and TCA9535DBR/DBT have unlimited shelf life and less stringent storage requirements. MSL rating affects component handling, storage, and reflow soldering procedures.

Q: Can I use TCA9535 series parts in applications requiring 2.5V minimum supply voltage?

A: TCA9535 series parts operate at 1.65V minimum supply voltage, which is below the 2.5V minimum of PCF8575TS/1,118. These parts are compatible with designs operating at 2.5V and above. The lower minimum voltage specification provides additional design flexibility for low-voltage applications.

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