SN74AHCT00NS Equivalent & Substitute Parts

Part Overview

The SN74AHCT00NS is a NAND Gate IC manufactured by Texas Instruments, featuring 4 channels with 2 inputs per channel in a 14-SO surface mount package. This device is classified as Last Time Buy, indicating discontinued production with limited availability. The SN74AHCT00NS operates within the 74AHCT logic series and is designed for applications requiring standard NAND gate functionality in compact form factors.

Identification of substitute parts is necessary due to the Last Time Buy status of the SN74AHCT00NS. Alternative equivalent parts ensure design continuity and supply chain reliability for new production runs and ongoing system support.

Key Parameters

Parameter	Value
Logic Type	NAND Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	4.5V ~ 5.5V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	8mA, 8mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	7.9ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.209", 5.30mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74AHCT00NS is determined by strict equivalence across the following critical parameters:

Logic Function & Circuit Configuration: Both the main part and substitute must implement identical NAND gate logic with 4 channels and 2 inputs per channel.

Electrical Specifications: Supply voltage range (4.5V ~ 5.5V), quiescent current (2 µA maximum), output current capability (8mA high and low), input logic thresholds (0.8V low, 2V high), and propagation delay (7.9ns @ 5V, 50pF) must be identical.

Package & Mounting: Surface mount configuration in 14-SOIC package with 0.209" width and 5.30mm physical dimensions ensures mechanical and electrical compatibility.

Environmental & Compliance: Operating temperature range (-40°C ~ 85°C), RoHS3 compliance, and MSL rating (1 - Unlimited) must be maintained.

Series Classification: Both parts belong to the 74AHCT logic series, ensuring functional and timing compatibility within existing designs.

Parameter Comparison

Parameter	SN74AHCT00NS	SN74AHCT00NSR
Manufacturer	Texas Instruments	Texas Instruments
Logic Type	NAND Gate	NAND Gate
Number of Circuits	4	4
Number of Inputs	2	2
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Max)	2 µA	2 µA
Current - Output High, Low	8mA, 8mA	8mA, 8mA
Input Logic Level - Low	0.8V	0.8V
Input Logic Level - High	2V	2V
Max Propagation Delay @ V, Max CL	7.9ns @ 5V, 50pF	7.9ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	14-SOIC (0.209", 5.30mm Width)	14-SOIC (0.209", 5.30mm Width)
Packaging Format	Tube	Tape & Reel (TR)
Product Status	Last Time Buy	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SN74AHCT00NSR is the primary substitute for SN74AHCT00NS. Both parts are manufactured by Texas Instruments and share identical electrical and functional specifications. The SN74AHCT00NSR maintains Active product status, ensuring continued availability and supply chain support compared to the Last Time Buy status of the original part.

The distinction between these parts is packaging format: SN74AHCT00NS is supplied in tube packaging, while SN74AHCT00NSR is supplied in Tape & Reel format. Both formats are compatible with standard assembly processes; selection depends on production volume and handling requirements.

Both parts maintain ROHS3 compliance and MSL rating of 1 (Unlimited), confirming environmental and moisture handling compatibility. No additional qualification or testing is required for direct substitution in existing designs.

Frequently Asked Questions (FAQ)

Q: Can SN74AHCT00NSR directly replace SN74AHCT00NS in existing designs?

A: Yes. Both parts are electrically and functionally identical across all specified parameters, including logic function, electrical characteristics, timing, operating temperature range, and package dimensions. Direct substitution is valid without design modification.

Q: What is the difference between tube and Tape & Reel packaging?

A: Tube packaging (SN74AHCT00NS) is suitable for lower-volume applications and manual handling. Tape & Reel packaging (SN74AHCT00NSR) is optimized for automated assembly processes and higher production volumes. Both formats contain identical components; packaging selection depends on manufacturing process requirements.

Q: Why is SN74AHCT00NS marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part number. Existing inventory is available for a limited time. SN74AHCT00NSR, with Active status, is the recommended alternative for new designs and ongoing production.

Q: Are there any compliance or certification differences between these parts?

A: No. Both parts maintain identical RoHS3 compliance and MSL rating (1 - Unlimited). No additional certifications or compliance documentation is required for substitution.

Q: What are the critical parameters for NAND gate substitution?

A: Logic function (4-channel, 2-input NAND), supply voltage (4.5V ~ 5.5V), output current (8mA), propagation delay (7.9ns @ 5V, 50pF), and package type (14-SOIC) must remain constant. All specified parameters are identical between the main part and substitute.

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