PCF8575CTS/1,118 Equivalent & Substitute Parts

Part Overview

The PCF8575CTS/1,118 is a 16-bit I/O Expander with I2C interface operating at 400 kHz, manufactured by NXP USA Inc. in a 24-SSOP package. This part is classified as Obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The device provides 16 programmable I/O lines with push-pull output configuration, interrupt output capability, and power-on reset (POR) feature, suitable for applications requiring expanded digital I/O capabilities via I2C bus communication.

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	25mA
Voltage - Supply	4.5V ~ 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	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the PCF8575CTS/1,118 is determined by the following critical parameters: 16 I/O lines, I2C interface at 400 kHz, push-pull output configuration, 25mA source/sink capability, and 24-pin surface mount packaging. Substitute parts are grouped into two categories based on compatibility:

Category 1: Direct Package Compatibility (24-SSOP) Parts maintaining the identical 24-SSOP package footprint with matching electrical specifications enable direct board-level substitution without layout modifications.

Category 2: Functional Equivalence with Package Variation (28-pin packages) Parts providing 16 I/O expansion via I2C at 400 kHz with compatible electrical parameters but different package geometries (28-SOIC, 28-SSOP, 28-QFN, 28-SPDIP) require PCB redesign but offer superior active product status and extended supply availability.

Parameter Comparison

Part Number	Manufacturer	I/O Count	Interface	Clock Freq	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Status
PCF8575CTS/1,118	NXP USA Inc.	16	I2C	400 kHz	Push-Pull	25	4.5V ~ 5.5V	-40°C ~ 85°C	24-SSOP	Obsolete
PCA9535CPW,118	NXP USA Inc.	16	I2C, SMBus	400 kHz	Open Drain	10, 25	2.3V ~ 5.5V	-40°C ~ 85°C	24-TSSOP	Active
PCF8575CDBR	Texas Instruments	16	I2C, SMBus	400 kHz	Open Drain	10, 25	4.5V ~ 5.5V	-40°C ~ 85°C	24-SSOP	Obsolete
MAX7326AEG+T	Analog Devices Inc./Maxim Integrated	16	I2C	400 kHz	Push-Pull	20	1.71V ~ 5.5V	-40°C ~ 125°C	24-QSOP	Active
MCP23016T-I/SO	Microchip Technology	16	I2C	400 kHz	Push-Pull	25	2V ~ 5.5V	-40°C ~ 85°C	28-SOIC	Active
MCP23016T-I/SS	Microchip Technology	16	I2C	400 kHz	Push-Pull	25	2V ~ 5.5V	-40°C ~ 85°C	28-SSOP	Active
MCP23016-I/ML	Microchip Technology	16	I2C	400 kHz	Push-Pull	25	2V ~ 5.5V	-40°C ~ 85°C	28-QFN (6x6)	Active
MCP23016-I/SP	Microchip Technology	16	I2C	400 kHz	Push-Pull	25	2V ~ 5.5V	-40°C ~ 85°C	28-SPDIP	Active
MCP23016-I/SS	Microchip Technology	16	I2C	400 kHz	Push-Pull	25	2V ~ 5.5V	-40°C ~ 85°C	28-SSOP	Active
PCF8575CDB	Texas Instruments	16	I2C, SMBus	400 kHz	Push-Pull	10, 25	2.5V ~ 5.5V	-40°C ~ 85°C	24-SSOP	Obsolete
PCF8575DB	Texas Instruments	16	I2C, SMBus	400 kHz	Push-Pull	10, 25	2.5V ~ 5.5V	-40°C ~ 85°C	24-SSOP	Obsolete

Engineering Selection Recommendations

For Direct Board-Level Substitution (No Layout Changes): PCA9535CPW,118 is the primary recommendation. It maintains NXP manufacturing lineage, is Active product status, operates within the required 4.5V ~ 5.5V supply range when configured appropriately, and uses a compatible 24-pin surface mount package (24-TSSOP). The open-drain output configuration is compatible with I2C bus pull-up resistor networks. This part is ROHS3 compliant and carries unlimited moisture sensitivity rating.

For New Designs with Layout Flexibility: MCP23016T-I/SO or MCP23016T-I/SS (Microchip Technology) provide Active product status with extended supply voltage range (2V ~ 5.5V), identical 25mA output capability, and push-pull output matching the original specification. These parts are available in 28-pin surface mount packages with superior inventory levels (3400 and 825 units respectively). Both are ROHS3 compliant with unlimited MSL rating.

For Extended Temperature Applications: MAX7326AEG+T (Analog Devices Inc./Maxim Integrated) offers Active status with extended operating temperature range (-40°C ~ 125°C) and wider supply voltage tolerance (1.71V ~ 5.5V). Output current is rated at 20mA, which is acceptable for most I2C expansion applications. Package is 24-QSOP, requiring minor PCB footprint adjustment.

Compliance Considerations: All recommended substitutes maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and EAR99 export classification matching the original part. REACH status is unaffected across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can PCA9535CPW,118 replace PCF8575CTS/1,118 directly on the PCB? A: PCA9535CPW,118 uses 24-TSSOP packaging versus the original 24-SSOP. While both are 24-pin surface mount packages, the TSSOP variant has a narrower body (4.40mm vs 5.30mm width). Direct footprint compatibility requires verification against your PCB layout. The electrical interface (I2C, 400 kHz, 16 I/O) is fully compatible.

Q: What is the difference between push-pull and open-drain output configurations? A: Push-pull outputs actively drive both high and low logic states, providing stronger drive capability. Open-drain outputs pull to ground but require external pull-up resistors for high state. The original PCF8575CTS/1,118 uses push-pull; PCA9535CPW,118 uses open-drain. Both configurations work with I2C bus architecture, though open-drain is standard for I2C multi-master systems.

Q: Why do MCP23016 variants have 28 pins instead of 24? A: MCP23016 devices include additional ground and power pins for improved thermal and electrical performance. The extra pins do not add functional I/O; all variants provide 16 I/O lines. The 28-pin configuration requires PCB redesign but offers superior current handling and thermal characteristics.

Q: Is the supply voltage range difference between 4.5V ~ 5.5V and 2V ~ 5.5V significant? A: For applications operating at 5V logic levels, both ranges are compatible. The wider 2V ~ 5.5V range of MCP23016 variants provides flexibility for lower-voltage systems (3.3V, 2.5V) without requiring level translation. If your system operates strictly at 5V, this difference is not a constraint.

Q: Can I use a 28-pin substitute in a 24-pin socket? A: No. 28-pin packages (SOIC, SSOP, QFN, SPDIP) require different PCB footprints and cannot be used in 24-pin sockets. Substitution with 28-pin variants requires PCB redesign and re-layout.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance certification matching the original PCF8575CTS/1,118, ensuring compatibility with environmental and regulatory requirements.

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