SN74ACT14NS Equivalent & Substitute Parts

Part Overview

The SN74ACT14NS is a 6-channel inverter IC with Schmitt trigger inputs manufactured by Texas Instruments in the 74ACT logic series. This component functions as a digital inverter with hysteresis characteristics, converting logic signals while providing noise immunity through Schmitt trigger input thresholds. The SN74ACT14NS is designated as Last Time Buy, indicating end-of-life status. Identifying equivalent substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently using this component.

Key Parameters

Parameter	Value
Logic Type	Inverter
Number of Circuits	6
Number of Inputs	1
Features	Schmitt Trigger
Voltage - Supply	4.5V ~ 5.5V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	24mA, 24mA
Input Logic Level - Low	0.5V ~ 1.4V
Input Logic Level - High	1.2V ~ 2.1V
Max Propagation Delay @ V, Max CL	11.5ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C
Package / Case	14-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74ACT14NS is determined by strict equivalence across the following critical parameters:

Logic configuration: 6-channel inverter with Schmitt trigger inputs
Electrical specifications: 4.5V ~ 5.5V supply voltage, 2 µA maximum quiescent current, 24mA output drive capability, and 11.5ns propagation delay
Input/output logic levels and hysteresis characteristics
Package type: 14-SOIC surface mount form factor
Operating temperature range: -40°C ~ 85°C
Compliance certifications: ROHS3, MSL Level 1

The primary substitute identified is the SN74ACT14NSR, which maintains identical electrical and functional specifications while differing only in packaging format (Tape & Reel versus Tube). This substitution is valid for applications where the packaging delivery method does not impact circuit design or assembly requirements.

Parameter Comparison

Parameter	SN74ACT14NS (Main Part)	SN74ACT14NSR (Substitute)
Manufacturer	Texas Instruments	Texas Instruments
Logic Type	Inverter	Inverter
Number of Circuits	6	6
Number of Inputs	1	1
Features	Schmitt Trigger	Schmitt Trigger
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Max)	2 µA	2 µA
Current - Output High, Low	24mA, 24mA	24mA, 24mA
Input Logic Level - Low	0.5V ~ 1.4V	0.5V ~ 1.4V
Input Logic Level - High	1.2V ~ 2.1V	1.2V ~ 2.1V
Max Propagation Delay @ V, Max CL	11.5ns @ 5V, 50pF	11.5ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	14-SOIC (0.209", 5.30mm Width)	14-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount	Surface Mount
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

The SN74ACT14NSR is the direct functional equivalent of the SN74ACT14NS. Both components are manufactured by Texas Instruments, maintain identical electrical performance specifications, and are housed in the same 14-SOIC package. The distinction between these parts is packaging format: the main part is supplied in Tube packaging, while the substitute is supplied in Tape & Reel format.

Selection between these parts should be based on procurement and assembly requirements. The SN74ACT14NSR carries Active product status, ensuring continued availability and support, whereas the SN74ACT14NS is Last Time Buy. For new designs or long-term production requirements, the SN74ACT14NSR is the appropriate selection. Both parts maintain full ROHS3 compliance and MSL Level 1 rating, confirming suitability for standard surface mount assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the SN74ACT14NSR directly replace the SN74ACT14NS in existing designs?

A: Yes. The SN74ACT14NSR is electrically and functionally identical to the SN74ACT14NS. Both components feature the same 6-channel inverter configuration with Schmitt trigger inputs, identical supply voltage range (4.5V ~ 5.5V), output drive capability (24mA), propagation delay (11.5ns), and operating temperature range (-40°C ~ 85°C). Pin configuration and package dimensions are identical.

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

A: Tube packaging supplies components in plastic tubes suitable for manual handling and small-quantity applications. Tape & Reel packaging supplies components on continuous carrier tape wound on reels, optimized for automated pick-and-place assembly equipment. The electrical and functional characteristics of the component are unchanged; the difference is in delivery and handling format.

Q: Why is the SN74ACT14NS marked as Last Time Buy?

A: Last Time Buy designation indicates that Texas Instruments has discontinued this product line. The SN74ACT14NSR, carrying Active status, represents the current production equivalent and should be used for new designs and ongoing production requirements.

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

A: No. Both the SN74ACT14NS and SN74ACT14NSR maintain identical ROHS3 compliance and MSL Level 1 rating. Both are suitable for standard surface mount assembly processes without additional handling requirements.

Q: Can the SN74ACT14NSR be used in high-volume production?

A: Yes. The Tape & Reel packaging format of the SN74ACT14NSR is specifically designed for high-volume automated assembly. The Active product status ensures reliable supply chain availability for production requirements.

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