74AC08SC Equivalent & Substitute Parts

Part Overview

The 74AC08SC is a 4-channel 2-input AND gate logic IC manufactured by onsemi 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 represents a standard logic gate function across multiple manufacturers and packaging variants, with several active alternatives available in the market.

Key Parameters

Parameter	Value
Logic Type	AND Gate
Number of Circuits	4
Number of Inputs	2
Voltage Supply Range	2V ~ 6V
Current - Quiescent (Max)	2 µA
Current - Output High/Low	24mA / 24mA
Input Logic Level - Low	0.9V ~ 1.65V
Input Logic Level - High	2.1V ~ 3.85V
Max Propagation Delay	7.5ns @ 5V, 50pF
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 74AC08SC is determined by the following critical parameters: logic function (AND gate), circuit count (4 channels), input count (2 inputs per gate), supply voltage range (2V ~ 6V minimum), output drive capability (24mA minimum), propagation delay (7.5ns maximum @ 5V, 50pF), and package compatibility (14-SOIC form factor). Parts are grouped into three categories based on substitution relationship type:

Direct Manufacturer Substitutes maintain identical electrical specifications and 14-SOIC packaging, differing only in packaging format (tape & reel, cut tape, or tube) or product status. These parts are pin-compatible and functionally equivalent with no design changes required.

Parametric Equivalents meet or exceed all critical electrical specifications within the same 14-SOIC package but may have minor variations in quiescent current or propagation delay that remain within acceptable design margins.

Similar Parts share the same logic function and package family but may have extended operating temperature ranges, automotive qualification, or slightly different electrical characteristics that require design verification before substitution.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Supply	Quiescent Current (Max)	Propagation Delay	Operating Temp	Packaging	Package / Case
74AC08SC	onsemi	Obsolete	2V ~ 6V	2 µA	7.5ns @ 5V, 50pF	-40°C ~ 85°C	-	14-SOIC (0.154", 3.90mm)
MC74AC08DR2G	onsemi	Active	2V ~ 6V	4 µA	7.5ns @ 5V, 50pF	-40°C ~ 85°C	Tape & Reel (TR)	14-SOIC (0.154", 3.90mm)
MC74AC08DG	onsemi	Active	2V ~ 6V	4 µA	7.5ns @ 5V, 50pF	-40°C ~ 85°C	Tube	14-SOIC (0.154", 3.90mm)
SN74AC08D	Texas Instruments	Discontinued at DiGi Electronics	2V ~ 6V	2 µA	7.5ns @ 5V, 50pF	-40°C ~ 85°C	-	14-SOIC (0.154", 3.90mm)
SN74AC08DR	Texas Instruments	Active	2V ~ 6V	2 µA	7.5ns @ 5V, 50pF	-40°C ~ 85°C	Cut Tape (CT) & Digi-Reel®	14-SOIC (0.154", 3.90mm)
SN74AC08QDRG4Q1	Texas Instruments	Active	2V ~ 6V	2 µA	7.5ns @ 5V, 50pF	-40°C ~ 125°C	Tape & Reel (TR)	14-SOIC (0.154", 3.90mm)
CD74AC08M96	Texas Instruments	Active	1.5V ~ 5.5V	4 µA	8.7ns @ 5V, 50pF	-55°C ~ 125°C	Cut Tape (CT) & Digi-Reel®	14-SOIC (0.154", 3.90mm)
SN74AC08MDREP	Texas Instruments	Last Time Buy	2V ~ 6V	2 µA	7.5ns @ 5V, 50pF	-55°C ~ 125°C	Tape & Reel (TR)	14-SOIC (0.154", 3.90mm)
SN74AC08NSR	Texas Instruments	Active	2V ~ 6V	2 µA	7.5ns @ 5V, 50pF	-40°C ~ 85°C	Tape & Reel (TR)	14-SO (0.209", 5.30mm)

Engineering Selection Recommendations

Primary Recommendation: SN74AC08DR (Texas Instruments)

The SN74AC08DR is the preferred direct substitute for the obsolete 74AC08SC. It maintains identical electrical specifications (2 µA quiescent current, 7.5ns propagation delay, -40°C to 85°C operating range) and 14-SOIC package form factor. The part is currently active in production with high inventory availability (4,875 pcs), ensuring long-term supply continuity. Cut tape and Digi-Reel packaging supports both prototype and production workflows.

Secondary Recommendation: MC74AC08DR2G (onsemi)

For designs requiring continued onsemi sourcing, MC74AC08DR2G provides an active alternative with identical package and functional specifications. The 4 µA quiescent current specification remains within acceptable design margins for most applications. Tape & reel packaging is optimized for automated assembly.

Extended Temperature Option: SN74AC08QDRG4Q1 (Texas Instruments)

This automotive-qualified variant (AEC-Q100) extends the operating temperature range to -40°C to 125°C and is suitable for applications requiring enhanced thermal performance or automotive compliance. Electrical specifications remain identical to the base 74AC08 series.

Wide Supply Voltage Option: CD74AC08M96 (Texas Instruments)

For applications requiring extended supply voltage range (1.5V ~ 5.5V) or wider operating temperature (-55°C ~ 125°C), CD74AC08M96 provides parametric equivalence with acceptable propagation delay variance (8.7ns vs. 7.5ns). This part is suitable for battery-powered or industrial temperature environments.

Package Variant: SN74AC08NSR (Texas Instruments)

This part maintains identical electrical specifications but uses a 14-SO package (0.209" width) instead of 14-SOIC (0.154" width). PCB layout modifications are required for this substitution.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74AC08SC with SN74AC08DR without design changes?

A: Yes. SN74AC08DR is a direct pin-compatible substitute with identical electrical specifications and 14-SOIC package. No circuit modifications are required.

Q: What is the difference between MC74AC08DR2G and MC74AC08DG?

A: Both parts are onsemi 74AC08 variants with identical electrical specifications and 14-SOIC packaging. MC74AC08DR2G is supplied in tape & reel format for automated assembly, while MC74AC08DG is supplied in tube format for manual handling.

Q: Why does CD74AC08M96 have a longer propagation delay (8.7ns vs. 7.5ns)?

A: CD74AC08M96 supports an extended supply voltage range (1.5V ~ 5.5V) and wider operating temperature (-55°C ~ 125°C). The slightly longer propagation delay is a trade-off for this extended operating envelope. Verify timing margins in your application before substitution.

Q: Is SN74AC08QDRG4Q1 suitable for non-automotive applications?

A: Yes. SN74AC08QDRG4Q1 is automotive-qualified but functionally equivalent to standard 74AC08 parts. The extended temperature range (-40°C ~ 125°C) and AEC-Q100 qualification make it suitable for industrial and high-reliability applications.

Q: Can I use SN74AC08NSR as a substitute if my PCB is designed for 14-SOIC?

A: No. SN74AC08NSR uses a 14-SO package with different physical dimensions (0.209" width vs. 0.154" width). PCB footprint and layout modifications are required.

Q: What is the inventory status for these substitute parts?

A: SN74AC08DR has the highest availability (4,875 pcs), followed by SN74AC08QDRG4Q1 (5,729 pcs) and CD74AC08M96 (31,294 pcs). MC74AC08DR2G and MC74AC08DG are available from onsemi with 1,130 and 3,991 pcs respectively.

Q: Are all these parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

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