SN74AS1000AD Equivalent & Substitute Parts

Part Overview

The SN74AS1000AD is a NAND Gate IC featuring 4 channels with 2 inputs per channel in a 14-SOIC surface mount package, manufactured by Texas Instruments. This component operates within the 4.5V to 5.5V supply voltage range and is designed for logic-level switching applications requiring fast propagation delays.

The SN74AS1000AD carries a Last Time Buy product status, indicating that Texas Instruments has discontinued active production. This status necessitates identifying equivalent substitute parts to ensure design continuity and procurement availability for new builds and ongoing production requirements.

Key Parameters

Parameter	Value
Logic Type	NAND Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	4.5V ~ 5.5V
Current - Output High, Low	48mA, 48mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	4ns @ 5V, 50pF
Operating Temperature	0°C ~ 70°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN74AS1000AD is determined by strict equivalence across the following critical parameters:

Logic Type: NAND Gate configuration
Number of Circuits: 4 channels
Number of Inputs: 2 inputs per channel
Voltage - Supply: 4.5V ~ 5.5V operating range
Current - Output High, Low: 48mA, 48mA drive capability
Input Logic Level - Low: 0.8V threshold
Input Logic Level - High: 2V threshold
Max Propagation Delay @ V, Max CL: 4ns @ 5V, 50pF
Operating Temperature: 0°C ~ 70°C
Package / Case: 14-SOIC form factor
Mounting Type: Surface Mount

The SN74AS1000ADR qualifies as a direct substitute based on identical electrical specifications and mechanical compatibility. The primary distinction between these parts is packaging format: the SN74AS1000AD is supplied in Tube packaging, while the SN74AS1000ADR is supplied in Tape & Reel (TR) format. Both parts share the same base product number (74AS1000) and are manufactured by Texas Instruments.

Parameter Comparison

Parameter	SN74AS1000AD	SN74AS1000ADR
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 - Output High, Low	48mA, 48mA	48mA, 48mA
Input Logic Level - Low	0.8V	0.8V
Input Logic Level - High	2V	2V
Max Propagation Delay @ V, Max CL	4ns @ 5V, 50pF	4ns @ 5V, 50pF
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount
Product Status	Last Time Buy	Active
Packaging Format	Tube	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The SN74AS1000ADR is the recommended substitute for the SN74AS1000AD based on the following factors:

Product Status: The SN74AS1000ADR maintains Active product status with Texas Instruments, ensuring continued availability and manufacturing support. The SN74AS1000AD is designated Last Time Buy, indicating production discontinuation.

Compliance & Certifications: Both parts maintain identical ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for new designs and production environments.

Electrical & Mechanical Equivalence: All functional parameters, electrical specifications, and mechanical dimensions are identical between the two parts. Pin configuration, logic operation, and performance characteristics remain unchanged.

Packaging Consideration: The transition from Tube to Tape & Reel (TR) packaging reflects standard industry practice for active production components. Tape & Reel format is optimized for automated assembly processes and is the preferred packaging format for high-volume manufacturing.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS1000ADR be used as a direct replacement for the SN74AS1000AD in existing designs?

A: Yes. The SN74AS1000ADR is electrically and mechanically identical to the SN74AS1000AD. All functional parameters, pin assignments, and performance specifications are equivalent. The only difference is the packaging format (Tape & Reel versus Tube).

Q: What is the significance of the Last Time Buy status on the SN74AS1000AD?

A: Last Time Buy status indicates that Texas Instruments has ceased active production of this part number. Existing inventory may be available from distributors, but no new manufacturing runs are planned. The SN74AS1000ADR, with Active status, represents the current production equivalent.

Q: Are there any compatibility issues when switching from Tube to Tape & Reel packaging?

A: No compatibility issues exist at the component level. Both packaging formats contain identical parts. The difference is in handling and assembly: Tube packaging is suitable for manual assembly or small-batch operations, while Tape & Reel is optimized for automated pick-and-place assembly systems.

Q: Do both parts meet the same compliance and regulatory requirements?

A: Yes. Both the SN74AS1000AD and SN74AS1000ADR are ROHS3 compliant and REACH unaffected, meeting identical regulatory standards for environmental and hazardous substance restrictions.

Q: What are the key electrical parameters that define substitution eligibility for this NAND gate IC?

A: Substitution eligibility is determined by matching logic type (NAND Gate), circuit count (4 channels), input count (2 inputs per channel), supply voltage range (4.5V ~ 5.5V), output current capability (48mA high and low), input logic thresholds (0.8V low, 2V high), propagation delay (4ns @ 5V, 50pF), and operating temperature range (0°C ~ 70°C).

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