SN74AC08DRE4 Equivalent & Substitute Parts

Part Overview

The SN74AC08DRE4 is a 4-channel 2-input AND Gate logic IC manufactured by Texas Instruments in 14-SOIC surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74AC08 series provides standard AND gate functionality across the 2V to 6V supply voltage range with consistent propagation delay characteristics suitable for general-purpose digital logic applications.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the SN74AC08DRE4 is determined by strict equivalence across the following parameters:

Logic Type: AND Gate with 4 circuits and 2 inputs per circuit
Voltage Supply Range: 2V ~ 6V
Output Current Capability: 24mA high and low
Propagation Delay: 7.5ns maximum at 5V with 50pF load
Operating Temperature Range: -40°C ~ 85°C
Package: 14-SOIC surface mount form factor
Compliance: ROHS3 and REACH requirements

All substitute parts listed maintain these electrical and mechanical specifications. Packaging format (Cut Tape, Tube, or Tape & Reel) and product status (Active vs. Obsolete) are secondary considerations that do not affect functional equivalence.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Supply	Quiescent Current (Max)	Output Current (High/Low)	Propagation Delay	Package	Packaging Format	Inventory
SN74AC08DRE4	Texas Instruments	Obsolete	2V ~ 6V	2 µA	24mA / 24mA	7.5ns @ 5V, 50pF	14-SOIC	Cut Tape & Digi-Reel	720 Pcs
SN74AC08DR	Texas Instruments	Active	2V ~ 6V	2 µA	24mA / 24mA	7.5ns @ 5V, 50pF	14-SOIC	Cut Tape & Digi-Reel	4875 Pcs
MC74AC08DG	onsemi	Active	2V ~ 6V	4 µA	24mA / 24mA	7.5ns @ 5V, 50pF	14-SOIC	Tube	3991 Pcs
74AC08SCX	Fairchild Semiconductor	Active	2V ~ 6V	2 µA	24mA / 24mA	7.5ns @ 5V, 50pF	14-SOIC	Not specified	300100 Pcs
MC74AC08DR2G	onsemi	Active	2V ~ 6V	4 µA	24mA / 24mA	7.5ns @ 5V, 50pF	14-SOIC	Tape & Reel	1130 Pcs

Engineering Selection Recommendations

Primary Recommendation: SN74AC08DR

The SN74AC08DR from Texas Instruments is the direct active-status equivalent to the obsolete SN74AC08DRE4. It maintains identical electrical specifications including 2 µA quiescent current and is available in higher inventory (4875 units). Both parts are ROHS3 compliant and REACH unaffected. This part is the preferred choice for direct replacement in existing designs.

Secondary Recommendations: MC74AC08DR2G and MC74AC08DG

Both onsemi variants (MC74AC08DR2G and MC74AC08DG) are functionally equivalent with the exception of quiescent current specification (4 µA vs. 2 µA). This difference is within acceptable tolerance for most applications and does not affect logic operation or timing. MC74AC08DR2G is supplied in Tape & Reel format, while MC74AC08DG is supplied in Tube format. Selection between these depends on packaging and procurement requirements.

Alternative: 74AC08SCX

The Fairchild Semiconductor 74AC08SCX provides full electrical equivalence with 2 µA quiescent current matching the original part. Highest inventory availability (300100 units) makes this suitable for high-volume applications. Packaging format is not specified in available data.

Compliance Verification

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status. Parts are suitable for applications requiring these regulatory certifications.

Frequently Asked Questions (FAQ)

Q: Can I use MC74AC08DG or MC74AC08DR2G as direct replacements for SN74AC08DRE4?

A: Yes. Both onsemi parts are functionally equivalent. The quiescent current specification is 4 µA compared to 2 µA in the original part. This difference does not affect logic operation, timing characteristics, or output drive capability. All other electrical parameters are identical.

Q: What is the difference between the packaging formats listed?

A: Packaging format refers to how the parts are supplied: Cut Tape & Digi-Reel (individual parts on tape), Tube (bulk container), and Tape & Reel (continuous reel for automated assembly). These formats do not affect the component itself, only procurement and assembly processes.

Q: Why is SN74AC08DRE4 listed as obsolete?

A: The SN74AC08DRE4 has been discontinued by Texas Instruments. The active equivalent SN74AC08DR should be used for new designs and ongoing procurement.

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

A: Yes. All listed substitutes use the 14-SOIC (0.154", 3.90mm Width) surface mount package, ensuring mechanical and electrical compatibility with existing PCB layouts.

Q: Which substitute has the best inventory availability?

A: The 74AC08SCX from Fairchild Semiconductor has the highest inventory at 300,100 units. The SN74AC08DR from Texas Instruments has 4,875 units available.

Q: Do all substitutes meet the same compliance requirements?

A: All listed substitutes are ROHS3 compliant and REACH unaffected, matching the original part's regulatory status.

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