PCF8574NG4 Equivalent & Substitute Parts

Part Overview

The PCF8574NG4 is an 8-bit I/O expander with I2C interface operating at 100 kHz, designed for applications requiring remote I/O expansion over a two-wire serial bus. This component features push-pull output configuration with programmable interrupt output and power-on reset functionality. The PCF8574NG4 is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

PCF8574NG4

Texas InstrumentsIn Stock: 779PCF8574NG4 Datasheet

Current PartRFQ

PCF8574N

Texas InstrumentsIn Stock: 2056PCF8574N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCF8574NG4 is determined by strict equivalence across the following critical parameters:

• I/O Configuration: 8-bit I/O expander
• Serial Interface: I2C protocol at 100 kHz clock frequency
• Output Architecture: Push-pull output with interrupt capability
• Electrical Specifications: 1mA/25mA source/sink current, 2.5V–6V supply voltage range
• Temperature Range: -40°C to 85°C operating window
• Physical Form Factor: 16-DIP through-hole package (0.300" pitch, 7.62mm)
• Regulatory Compliance: ROHS3 compliant, REACH unaffected

The PCF8574N meets all substitution criteria as a direct functional equivalent with identical electrical and mechanical specifications. The primary distinction is product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The PCF8574N is the direct substitute for the PCF8574NG4. Both components are manufactured by Texas Instruments and share identical electrical and mechanical specifications across all critical parameters. The PCF8574N maintains active product status with confirmed inventory availability (2000 pcs), whereas the PCF8574NG4 is discontinued. Both components meet ROHS3 compliance and REACH regulatory requirements. Selection of the PCF8574N eliminates obsolescence risk while preserving full functional compatibility with existing circuit designs and PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the PCF8574N directly replace the PCF8574NG4 in existing designs?

A: Yes. The PCF8574N is a direct functional equivalent with identical I/O count, I2C interface specifications, output characteristics, supply voltage range, operating temperature range, and 16-DIP through-hole package dimensions. No circuit modifications are required.

Q: Are there differences in pin configuration between these parts?

A: No. Both components use the same 16-DIP package with identical pin assignments and functionality.

Q: What is the primary reason for substitution?

A: The PCF8574NG4 is discontinued at DiGi Electronics. The PCF8574N maintains active product status with available inventory, ensuring supply chain continuity.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both the PCF8574NG4 and PCF8574N are ROHS3 compliant and REACH unaffected.

Q: Is there a difference in packaging between these parts?

A: The PCF8574N is supplied in tube packaging, while the PCF8574NG4 packaging format is not specified. This distinction does not affect functional compatibility or performance.

Q: What are the key electrical parameters that define substitution eligibility?

A: Substitution is determined by matching I/O count (8-bit), I2C interface at 100 kHz, push-pull output configuration, 1mA/25mA source/sink current, 2.5V–6V supply voltage, -40°C to 85°C operating temperature, and 16-DIP through-hole package form factor.