PCA9554N,112 Equivalent & Substitute Parts

Part Overview

The PCA9554N,112 is an 8-bit I/O expander designed for I2C and SMBus communication at 400 kHz, manufactured by NXP USA Inc. in a 16-DIP through-hole package. This device features push-pull output configuration with 10mA/25mA source/sink capability and power-on reset functionality, operating across a 2.3V to 5.5V supply range and -40°C to 85°C temperature range.

The PCA9554N,112 is classified as obsolete. Identifying suitable substitute components is necessary to maintain system functionality in new designs or when original inventory becomes unavailable.

Substiute Parts

PCA9554N,112

NXP USA Inc.In Stock: 1210PCA9554N,112 Datasheet

Current PartRFQ

PCF8574AN

Texas InstrumentsIn Stock: 3941PCF8574AN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9554N,112 is determined by the following critical parameters:

• I/O Count: Must provide 8 I/O lines
• Interface Protocol: Must support I2C communication
• Interrupt Capability: Must include interrupt output functionality
• Output Configuration: Must use push-pull output topology
• Package Compatibility: Must be available in 16-DIP through-hole form factor
• Voltage Range: Supply voltage must accommodate the system's operating range
• Temperature Range: Must support -40°C to 85°C operation
• Compliance: Must maintain ROHS3 compliance

The PCF8574AN from Texas Instruments meets these core substitution criteria, though with differences in clock frequency and current specifications that must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The PCF8574AN is a functionally compatible substitute for the PCA9554N,112 based on matching I/O count, interrupt capability, push-pull output configuration, and identical 16-DIP package footprint. Both devices maintain ROHS3 compliance and support the required -40°C to 85°C operating temperature range.

Key differences exist in clock frequency (100 kHz vs. 400 kHz) and minimum source current (1mA vs. 10mA). The PCF8574AN's lower clock frequency may impact I2C bus timing in applications requiring higher data rates. The reduced source current specification requires verification against load requirements in the target application.

The PCF8574AN's active product status and current availability (3900 pcs in stock) provide supply chain advantages over the obsolete PCA9554N,112.

Frequently Asked Questions (FAQ)

Q: Can the PCF8574AN directly replace the PCA9554N,112 in existing designs?

A: Physical and functional compatibility exists due to identical 16-DIP packaging, matching I/O count, and equivalent interrupt output capability. However, the 100 kHz clock frequency of the PCF8574AN versus the 400 kHz specification of the PCA9554N,112 must be evaluated against system I2C bus timing requirements. The reduced source current (1mA minimum) requires verification against connected load specifications.

Q: What are the voltage supply differences between these parts?

A: The PCA9554N,112 operates from 2.3V to 5.5V, while the PCF8574AN operates from 2.5V to 6V. The PCF8574AN has a higher minimum voltage threshold (2.5V vs. 2.3V) and higher maximum rating (6V vs. 5.5V). System supply voltage must fall within both ranges for compatibility.

Q: Are both devices RoHS compliant?

A: Yes, both the PCA9554N,112 and PCF8574AN are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the significance of the different clock frequencies?

A: The PCA9554N,112 supports I2C/SMBus communication at 400 kHz, while the PCF8574AN supports I2C at 100 kHz. Applications requiring high-speed I2C bus operation may experience reduced data throughput with the PCF8574AN. Existing I2C bus configurations operating at 100 kHz or lower are compatible with the PCF8574AN.

Q: How do the output current specifications differ?

A: The PCA9554N,112 provides 10mA source and 25mA sink current, while the PCF8574AN provides 1mA source and 25mA sink current. The PCF8574AN's reduced source current may limit driving capability for certain load types. Applications requiring 10mA source current must use external buffers or verify compatibility with the PCF8574AN's 1mA specification.