MC74HC04AF Equivalent & Substitute Parts

Part Overview

The MC74HC04AF is a 6-channel inverter logic IC manufactured by onsemi in SOEIAJ-14 surface mount packaging. This component performs basic logic inversion across six independent channels with a single input per channel. The part is currently listed as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. Substitute parts must maintain identical logic functionality, electrical performance within acceptable tolerances, and compatible packaging specifications.

Substiute Parts

MC74HC04AF

onsemiIn Stock: 3125MC74HC04AF Datasheet

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SN74HC04NSR

Texas InstrumentsIn Stock: 74417SN74HC04NSR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MC74HC04AF is determined by the following critical parameters:

• Logic Function: Both parts must be 6-channel inverters with single input configuration
• Supply Voltage Range: Minimum 2V to 6V compatibility required
• Package Type: 14-SOIC (0.209", 5.30mm Width) surface mount package
• Base Product Series: 74HC logic family designation
• Pin Configuration: Identical 14-pin SOIC pinout

The SN74HC04NSR from Texas Instruments satisfies all substitution criteria. Both parts share the same base product number (74HC04), identical logic architecture, compatible voltage specifications, and equivalent package dimensions. The substitute maintains functional and electrical compatibility for direct replacement applications.

Parameter Comparison

Engineering Selection Recommendations

The SN74HC04NSR is the qualified substitute for the MC74HC04AF based on the following factors:

Functional Equivalence: Both parts implement identical 6-channel inverter logic with matching input/output specifications and electrical characteristics within acceptable engineering tolerances.

Supply Voltage Compatibility: The 2V to 6V supply range is identical across both parts, ensuring direct compatibility in existing circuit designs.

Package Compatibility: Both components use 14-SOIC (0.209", 5.30mm Width) surface mount packaging with identical pinout, enabling direct PCB replacement without layout modifications.

Compliance Status: The SN74HC04NSR holds active product status with ROHS3 compliance and MSL-1 rating, providing superior long-term availability and environmental compliance compared to the obsolete MC74HC04AF.

Performance Considerations: The SN74HC04NSR exhibits slightly higher quiescent current (2 µA vs. 1 µA) and propagation delay (16ns vs. 13ns), both within acceptable margins for standard logic applications. Operating temperature range differs (-40°C to 85°C vs. -55°C to 125°C); verify application requirements if extreme temperature operation is required.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC04NSR directly replace the MC74HC04AF without PCB modifications?

A: Yes. Both parts use identical 14-SOIC (0.209", 5.30mm Width) packaging with matching pinout. Direct PCB replacement is possible without layout changes.

Q: What are the key electrical differences between these parts?

A: Quiescent current differs by 1 µA (SN74HC04NSR: 2 µA maximum vs. MC74HC04AF: 1 µA maximum). Propagation delay differs by 3ns at 6V with 50pF load (SN74HC04NSR: 16ns vs. MC74HC04AF: 13ns). Both differences are within acceptable tolerances for standard logic applications.

Q: Does the operating temperature range difference affect substitution?

A: The SN74HC04NSR operates from -40°C to 85°C, while the MC74HC04AF operates from -55°C to 125°C. Verify your application's temperature requirements. If operation below -40°C or above 85°C is required, the SN74HC04NSR is not suitable.

Q: What is the significance of the RoHS and MSL rating differences?

A: The SN74HC04NSR is ROHS3 compliant with MSL-1 (unlimited moisture exposure), compared to the non-compliant MC74HC04AF with MSL-3 (168-hour limit). The SN74HC04NSR offers superior environmental compliance and handling flexibility for manufacturing and storage.

Q: Are there any supply voltage or logic level incompatibilities?

A: No. Both parts share identical supply voltage range (2V ~ 6V) and input logic level thresholds (Low: 0.5V ~ 1.8V; High: 1.5V ~ 4.2V). Logic compatibility is complete.

Q: Why is the MC74HC04AF listed as obsolete?

A: The MC74HC04AF is no longer in active production by onsemi. The SN74HC04NSR from Texas Instruments remains in active production and is the recommended substitute for new designs and ongoing system support.