SN74AC08D Equivalent & Substitute Parts

Part Overview

The SN74AC08D is a 4-channel 2-input AND gate logic IC manufactured by Texas Instruments in a 14-SOIC surface mount package. This part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing production and maintenance applications. The 74AC08 logic family provides standard AND gate functionality across multiple manufacturers, with several active alternatives available that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Logic Type	AND Gate
Number of Circuits	4
Number of Inputs	2
Voltage Supply Range	2V ~ 6V
Current Output High/Low	24mA / 24mA
Max Propagation Delay	7.5ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C
Package Type	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SN74AC08D is determined by strict equivalence across the following criteria:

Logic Function: All substitutes must be 4-channel 2-input AND gates
Electrical Specifications: Supply voltage range (2V ~ 6V), output current (24mA), propagation delay (7.5ns @ 5V, 50pF), and input logic levels must match
Package Compatibility: All substitutes use the 14-SOIC package with identical physical dimensions
Operating Temperature Range: -40°C ~ 85°C maintained across all alternatives
Compliance: RoHS3 compliance and REACH unaffected status required

The substitute parts are grouped by manufacturer recommendation status and packaging format, but all maintain identical electrical performance and pinout compatibility with the original SN74AC08D.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Supply	Quiescent Current (Max)	Output Current H/L	Propagation Delay	Package	Packaging Format	Inventory
SN74AC08D	Texas Instruments	Discontinued	2V ~ 6V	2 µA	24mA / 24mA	7.5ns @ 5V, 50pF	14-SOIC	SOIC	1940 Pcs
SN74AC08DR	Texas Instruments	Active	2V ~ 6V	2 µA	24mA / 24mA	7.5ns @ 5V, 50pF	14-SOIC	Cut Tape & Digi-Reel	4875 Pcs
74AC08SCX	Fairchild Semiconductor	Active	2V ~ 6V	2 µA	24mA / 24mA	7.5ns @ 5V, 50pF	14-SOIC	Standard	300100 Pcs
MC74AC08DR2G	onsemi	Active	2V ~ 6V	4 µA	24mA / 24mA	7.5ns @ 5V, 50pF	14-SOIC	Tape & Reel	1130 Pcs
MC74AC08DG	onsemi	Active	2V ~ 6V	4 µA	24mA / 24mA	7.5ns @ 5V, 50pF	14-SOIC	Tube	3991 Pcs

Engineering Selection Recommendations

Primary Recommendation: SN74AC08DR (Texas Instruments)

The SN74AC08DR is the direct manufacturer recommended substitute from Texas Instruments. It maintains identical electrical specifications to the original SN74AC08D, including the 2 µA quiescent current specification, and is currently in active production status. This part is available in Cut Tape and Digi-Reel packaging formats suitable for automated assembly processes.

Secondary Recommendations: 74AC08SCX (Fairchild Semiconductor) and MC74AC08DR2G / MC74AC08DG (onsemi)

All three alternatives are electrically equivalent and maintain the required 14-SOIC package format. The 74AC08SCX offers the highest inventory availability (300,100 pcs). The onsemi parts (MC74AC08DR2G and MC74AC08DG) are parametric equivalents with a maximum quiescent current specification of 4 µA, which remains within acceptable operating parameters for the 74AC logic family. Selection between these alternatives should be based on packaging format requirements (Tape & Reel vs. Tube) and supply chain availability.

All substitute parts maintain RoHS3 compliance and REACH unaffected status, ensuring regulatory compliance for new designs and production runs.

Frequently Asked Questions (FAQ)

Q: Can I use MC74AC08DR2G or MC74AC08DG as direct replacements for SN74AC08D?

A: Yes. Both onsemi parts are parametric equivalents with identical logic function, package type (14-SOIC), and critical electrical specifications including supply voltage range (2V ~ 6V), output current (24mA), and propagation delay (7.5ns @ 5V, 50pF). The quiescent current specification of 4 µA (versus 2 µA for the original) remains within acceptable limits for the 74AC logic family.

Q: What is the difference between SN74AC08DR and SN74AC08D?

A: Both parts are manufactured by Texas Instruments with identical electrical specifications. The primary difference is packaging format: SN74AC08D uses standard SOIC packaging, while SN74AC08DR is supplied in Cut Tape and Digi-Reel formats optimized for automated assembly. The SN74AC08DR is the active production part, while SN74AC08D is discontinued.

Q: Are all substitute parts in the same 14-SOIC package?

A: Yes. All substitute parts use the 14-SOIC package with identical physical dimensions (0.154" width, 3.90mm). This ensures direct compatibility with existing PCB layouts and assembly processes.

Q: Which substitute has the best availability?

A: The 74AC08SCX from Fairchild Semiconductor has the highest inventory level at 300,100 pcs. However, availability should be verified with your component supplier, as inventory levels change over time.

Q: Do all substitutes meet RoHS and REACH compliance requirements?

A: Yes. All substitute parts listed maintain RoHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component manufacturing and use.

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

A: These are supply format variations for the same component. Cut Tape and Digi-Reel are optimized for automated pick-and-place assembly. Tape & Reel provides components on continuous tape for high-volume production. Tube packaging is used for lower-volume applications and manual assembly. All formats contain electrically identical parts in the same 14-SOIC package.

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