SN74AC08MDREP Equivalent & Substitute Parts

Part Overview

The SN74AC08MDREP is a 4-channel 2-input AND gate logic IC manufactured by Texas Instruments, housed in a 14-SOIC surface mount package. This component operates across a 2V to 6V supply voltage range with a maximum propagation delay of 7.5ns at 5V with 50pF load. The part is currently in Last Time Buy status, indicating limited availability and the need to identify equivalent alternatives for ongoing design requirements and production planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74AC08MDREP
Manufacturer	Texas Instruments
Logic Type	AND Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	2V ~ 6V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	24mA, 24mA
Max Propagation Delay @ 5V, 50pF	7.5ns
Operating Temperature	-55°C ~ 125°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution for the SN74AC08MDREP is determined by the following critical parameters: logic function (4-channel 2-input AND gate), supply voltage range compatibility, output drive capability, propagation delay performance, and operating temperature range. Parts are grouped into three categories based on their relationship to the main part:

Parametric Equivalent: Parts that maintain identical electrical specifications and the same package type, ensuring direct functional replacement without design modification.

Upgrade Alternative: Parts that maintain core electrical specifications but may have different product status or availability, suitable for new designs or when the main part reaches end-of-life.

Manufacturer Recommended Alternative: Parts from alternative manufacturers that meet or exceed the electrical requirements, offering different packaging or supply options while maintaining functional compatibility.

Parameter Comparison

Parameter	SN74AC08MDREP (Main)	MC74AC08DR2G	74AC08SCX	MC74AC08DG	SN74LV4T08PWREP
Manufacturer	Texas Instruments	onsemi	Fairchild Semiconductor	onsemi	Texas Instruments
Logic Type	AND Gate	AND Gate	AND Gate	AND Gate	AND Gate
Number of Circuits	4	4	4	4	4
Number of Inputs	2	2	2	2	2
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	1.6V ~ 5.5V
Current - Quiescent (Max)	2 µA	4 µA	2 µA	4 µA	2 µA
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	8mA, 8mA
Max Propagation Delay @ 5V, 50pF	7.5ns	7.5ns	7.5ns	7.5ns	13ns
Operating Temperature	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-TSSOP
Packaging Type	Tape & Reel (TR)	Tape & Reel (TR)	-	Tube	Tape & Reel (TR)
Product Status	Last Time Buy	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	-	ROHS3 Compliant	-

Engineering Selection Recommendations

For Direct Replacement (Same Package, Same Performance): MC74AC08DR2G and MC74AC08DG from onsemi are active products that maintain the 14-SOIC package and identical electrical specifications (7.5ns propagation delay, 24mA output drive). MC74AC08DR2G in Tape & Reel packaging is preferred for automated assembly. Both parts are ROHS3 compliant and suitable for production environments where the SN74AC08MDREP is no longer available.

74AC08SCX from Fairchild Semiconductor provides the same 14-SOIC package and electrical performance with active product status and high inventory availability. Operating temperature range is reduced to -40°C ~ 85°C, which is acceptable for most commercial and industrial applications.

For Lower Power or Extended Temperature Requirements: SN74LV4T08PWREP from Texas Instruments offers extended upper operating temperature to 125°C and lower supply voltage floor of 1.6V. However, this part uses a 14-TSSOP package (different footprint) and has reduced output drive capability (8mA vs 24mA) and slower propagation delay (13ns vs 7.5ns). This substitution requires PCB layout modification and is suitable only when lower power consumption or extended temperature range is a design priority.

Product Status Consideration: The SN74AC08MDREP is in Last Time Buy status. For new designs or long-term production, select from the active alternatives: MC74AC08DR2G, MC74AC08DG, or 74AC08SCX to ensure continued supply availability.

Frequently Asked Questions (FAQ)

Q: Can MC74AC08DR2G directly replace SN74AC08MDREP without PCB changes? A: Yes. Both parts use the 14-SOIC package with identical pinout, supply voltage range (2V ~ 6V), propagation delay (7.5ns @ 5V, 50pF), and output drive capability (24mA). No PCB layout modifications are required.

Q: What is the difference between MC74AC08DR2G and MC74AC08DG? A: Both are onsemi 74AC08 AND gate ICs with identical electrical specifications. MC74AC08DR2G is supplied in Tape & Reel packaging for automated assembly, while MC74AC08DG is supplied in Tube packaging for manual handling. Select based on assembly process requirements.

Q: Why does SN74LV4T08PWREP have different electrical specifications? A: SN74LV4T08PWREP is from the 74LV logic family, which operates at lower voltage and power levels compared to the 74AC family. It features reduced output drive (8mA vs 24mA) and slower propagation delay (13ns vs 7.5ns). This part is suitable only when lower power consumption is required and the application can tolerate slower switching speeds.

Q: Can I use SN74LV4T08PWREP as a drop-in replacement? A: No. SN74LV4T08PWREP uses a 14-TSSOP package instead of 14-SOIC, requiring PCB redesign. Additionally, reduced output drive and slower propagation delay may affect circuit performance. Use only if design specifications explicitly allow these trade-offs.

Q: What is the operating temperature difference between substitutes? A: SN74AC08MDREP and SN74LV4T08PWREP operate to 125°C. MC74AC08DR2G, MC74AC08DG, and 74AC08SCX operate to 85°C. For applications requiring -55°C lower temperature limit, only SN74AC08MDREP and SN74LV4T08PWREP qualify; however, SN74LV4T08PWREP requires package change.

Q: Are all substitutes RoHS compliant? A: MC74AC08DR2G, MC74AC08DG, and SN74AC08MDREP are ROHS3 compliant. Compliance status for 74AC08SCX and SN74LV4T08PWREP is not specified in the provided data.

Q: Which substitute has the best inventory availability? A: 74AC08SCX from Fairchild Semiconductor has 300,100 pieces in stock, significantly higher than other alternatives. MC74AC08DG has 3,991 pieces, MC74AC08DR2G has 1,130 pieces, and SN74LV4T08PWREP has 1,006 pieces.

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