SN74AS04NS Equivalent & Substitute Parts

Part Overview

The SN74AS04NS is a 6-channel inverter logic integrated circuit manufactured by Texas Instruments in the 74AS series. This component functions as a hex inverter, converting logic signals across six independent channels. The SN74AS04NS is classified as Last Time Buy, indicating discontinued production status. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently utilizing this component.

Substiute Parts

SN74AS04NS

Texas InstrumentsIn Stock: 2581SN74AS04NS Datasheet

Current PartRFQ

SN74AS04NSR

Texas InstrumentsIn Stock: 2534SN74AS04NSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74AS04NS is determined by strict equivalence across the following critical parameters:

Functional Parameters:

• Logic type (Inverter)
• Number of circuits (6 channels)
• Voltage supply range (4.5V ~ 5.5V)
• Output current specifications (2mA high, 20mA low)
• Input logic levels (0.8V low, 2V high)
• Propagation delay (5ns @ 5V, 50pF)
• Operating temperature range (0°C ~ 70°C)

Physical Parameters:

• Package type (14-SOIC)
• Mounting type (Surface Mount)
• Pin configuration compatibility

Compliance Parameters:

• RoHS3 compliance
• Moisture sensitivity level (MSL 1)

The SN74AS04NSR qualifies as a direct substitute based on matching all functional and physical parameters. Packaging format differs (Tape & Reel versus tube), but this represents a supply chain variation rather than a functional difference.

Parameter Comparison

Engineering Selection Recommendations

The SN74AS04NSR is a direct functional equivalent to the SN74AS04NS. Selection between these parts should be based on the following criteria:

For New Designs or Restocking: Use SN74AS04NSR. This part carries Active product status from Texas Instruments, ensuring continued availability and manufacturing support. It maintains identical electrical and mechanical specifications while offering superior supply chain reliability.

For Existing Inventory Management: The SN74AS04NS remains suitable for current applications until stock depletion. The Last Time Buy status indicates no further production; transition to SN74AS04NSR should occur during the next procurement cycle.

Compliance Considerations: Both parts meet ROHS3 compliance requirements and carry identical moisture sensitivity ratings (MSL 1). No additional qualification is required when transitioning between these parts in compliant applications.

Packaging and Logistics: The primary difference between these parts is packaging format. SN74AS04NSR is supplied in Tape & Reel format, which is standard for automated assembly processes. If tube packaging is required for specific handling or storage procedures, this represents a supply chain decision rather than a technical incompatibility.

Frequently Asked Questions (FAQ)

Q: Can SN74AS04NSR be used as a direct replacement for SN74AS04NS in existing designs?

A: Yes. The SN74AS04NSR is electrically and mechanically identical to the SN74AS04NS. All functional parameters, including logic operation, timing, voltage specifications, and output characteristics, are equivalent. Pin configuration and package dimensions are identical. No design modifications are required.

Q: What is the difference between SN74AS04NS and SN74AS04NSR?

A: The primary difference is product status and packaging format. SN74AS04NS is Last Time Buy (discontinued), while SN74AS04NSR is Active (current production). SN74AS04NS is typically supplied in tube packaging, while SN74AS04NSR is supplied in Tape & Reel format. All electrical specifications are identical.

Q: Why is SN74AS04NS marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this specific part number. Existing inventory may be available from distributors, but no new manufacturing runs are scheduled. The SN74AS04NSR provides continuity for applications requiring this functionality.

Q: Are there any temperature or voltage derating considerations when substituting these parts?

A: No. Both parts operate across the identical temperature range (0°C ~ 70°C) and voltage supply range (4.5V ~ 5.5V). Derating curves and thermal characteristics are equivalent.

Q: Does the Tape & Reel packaging of SN74AS04NSR affect circuit performance?

A: No. Tape & Reel packaging is a supply and handling format only. It does not affect electrical performance, reliability, or functional characteristics. The die and internal circuitry are identical to tube-packaged versions.

Q: Are both parts RoHS compliant?

A: Yes. Both SN74AS04NS and SN74AS04NSR are ROHS3 compliant. No additional environmental qualification is required when using either part in compliant applications.

Q: What is the moisture sensitivity level for these parts?

A: Both parts carry MSL 1 (Unlimited) rating. This indicates unlimited shelf life under normal storage conditions without special moisture control requirements.