SN74AS00NS NAND Gate IC Equivalent & Substitute Parts

Part Overview

The SN74AS00NS is a 4-channel 2-input NAND gate logic integrated circuit manufactured by Texas Instruments in the 74AS series. This component is classified as Last Time Buy, indicating discontinued production with limited remaining inventory (757 pieces). The SN74AS00NS is housed in a 14-SO surface mount package and operates within the 4.5V to 5.5V supply voltage range, making it suitable for standard TTL logic applications requiring fast propagation delay characteristics.

Due to Last Time Buy status, identifying functionally equivalent substitute parts with active production status is essential for design continuity and long-term supply chain reliability.

Substiute Parts

SN74AS00NS

Texas InstrumentsIn Stock: 823SN74AS00NS Datasheet

Current PartRFQ

SN74AS00NSR

Texas InstrumentsIn Stock: 3840SN74AS00NSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74AS00NS is determined by strict equivalence across the following critical parameters:

Logic Function Equivalence: Both the main part and substitute must implement identical 4-channel 2-input NAND gate logic with no functional deviation.

Electrical Specifications: Supply voltage range (4.5V ~ 5.5V), input logic levels (Low: 0.8V, High: 2V), output current characteristics (2mA high, 20mA low), and propagation delay (4.5ns @ 5V, 50pF) must remain unchanged.

Package Compatibility: The 14-SOIC (0.209", 5.30mm Width) surface mount package must be identical to ensure PCB layout compatibility without redesign.

Environmental & Compliance Standards: RoHS3 compliance and MSL Level 1 rating must be maintained.

Series Designation: Both parts belong to the Texas Instruments 74AS logic family, ensuring consistent timing and electrical behavior within the same product line.

The substitute part SN74AS00NSR meets all these criteria while offering active production status and improved supply availability.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74AS00NSR

The SN74AS00NSR is the direct functional equivalent of the SN74AS00NS and is the manufacturer-recommended substitute. Selection of the SN74AS00NSR is justified on the following engineering grounds:

Product Status: The SN74AS00NSR maintains Active production status, ensuring long-term supply chain continuity and availability. The SN74AS00NS is designated Last Time Buy, indicating imminent discontinuation.

Electrical Equivalence: All critical electrical parameters—supply voltage, input/output logic levels, propagation delay, and current characteristics—are identical between the two parts. No circuit redesign or timing analysis revision is required.

Package Compatibility: Both parts use the identical 14-SOIC (0.209", 5.30mm Width) surface mount package, enabling direct PCB layout compatibility without modification.

Compliance & Certification: Both parts maintain ROHS3 compliance and MSL Level 1 rating, satisfying environmental and reliability requirements.

Packaging Consideration: The SN74AS00NSR is supplied in Tape & Reel (TR) format, which is standard for automated assembly processes. The SN74AS00NS is supplied in tube format. For high-volume production, the TR format of the substitute part offers manufacturing efficiency advantages.

Supply Availability: The SN74AS00NSR has significantly higher current inventory (3759 pieces) compared to the SN74AS00NS (757 pieces), providing superior supply security for ongoing production requirements.

Frequently Asked Questions (FAQ)

Q1: Can the SN74AS00NSR be used as a direct replacement for the SN74AS00NS without circuit modification?

A: Yes. The SN74AS00NSR is electrically and functionally identical to the SN74AS00NS across all specified parameters. The 14-SOIC package dimensions are identical, enabling direct PCB substitution without design changes.

Q2: What is the difference between the SN74AS00NS and SN74AS00NSR?

A: The primary differences are product status and packaging format. The SN74AS00NS is Last Time Buy with tube packaging; the SN74AS00NSR is Active production with Tape & Reel packaging. All electrical and functional specifications are identical.

Q3: Why is the SN74AS00NS designated Last Time Buy?

A: Last Time Buy designation indicates that Texas Instruments has discontinued this product variant and will not accept new orders after a specified cutoff date. Existing inventory will be sold until depletion. The SN74AS00NSR remains in active production as the current product offering.

Q4: Are there any timing or performance differences between these parts?

A: No. Both parts specify identical propagation delay (4.5ns @ 5V, 50pF), input/output logic levels, and current characteristics. Timing-critical applications can use either part without performance impact.

Q5: Does the Tape & Reel packaging of the SN74AS00NSR affect compatibility?

A: No. Tape & Reel is a packaging format for automated assembly and does not affect electrical performance or PCB compatibility. The component itself and its 14-SOIC package remain identical.

Q6: Are both parts RoHS compliant?

A: Yes. Both the SN74AS00NS and SN74AS00NSR are ROHS3 compliant and carry MSL Level 1 rating, meeting environmental and reliability standards.

Q7: Which part should be selected for new designs?

A: The SN74AS00NSR should be selected for new designs due to its Active production status and superior supply availability. The SN74AS00NS should be reserved for existing inventory management only.