SN74ACT08D Equivalent & Substitute Parts

Part Overview

The SN74ACT08D 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 74ACT08 logic family provides standard AND gate functionality suitable for digital logic circuits requiring 4.5V to 5.5V supply operation.

Key Parameters

Parameter	Value
Logic Type	AND Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	4.5V ~ 5.5V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	24mA, 24mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	9ns @ 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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74ACT08D is determined by strict equivalence across the following critical parameters:

Logic Type: AND Gate (4 channels, 2 inputs per channel)
Package: 14-SOIC form factor with identical pin configuration
Voltage Supply Range: 4.5V ~ 5.5V
Operating Temperature Range: -40°C ~ 85°C
Propagation Delay: 9ns @ 5V, 50pF
Output Drive Capability: 24mA high and low
Input Logic Levels: 0.8V low, 2V high
RoHS3 Compliance and MSL Level 1

All identified substitute parts maintain these electrical and mechanical specifications. Variations in quiescent current (2 µA vs. 4 µA) and packaging format (tube, cut tape, tape & reel) do not affect functional equivalence for circuit operation.

Parameter Comparison

Part Number	Manufacturer	Product Status	Packaging	Quiescent Current (Max)	Voltage Supply	Propagation Delay	Operating Temp	Inventory
SN74ACT08D	Texas Instruments	Discontinued	Tube	2 µA	4.5V ~ 5.5V	9ns @ 5V, 50pF	-40°C ~ 85°C	3400 Pcs
SN74ACT08DR	Texas Instruments	Active	Cut Tape (CT) & Digi-Reel®	2 µA	4.5V ~ 5.5V	9ns @ 5V, 50pF	-40°C ~ 85°C	2179 Pcs
74ACT08SC	onsemi	Active	Tube	4 µA	4.5V ~ 5.5V	9ns @ 5V, 50pF	-40°C ~ 85°C	1505 Pcs
74ACT08SCX	onsemi	Active	Cut Tape (CT) & Digi-Reel®	4 µA	4.5V ~ 5.5V	9ns @ 5V, 50pF	-40°C ~ 85°C	15691 Pcs
MC74ACT08DR2G	onsemi	Active	Tape & Reel (TR)	4 µA	4.5V ~ 5.5V	9ns @ 5V, 50pF	-40°C ~ 85°C	40300 Pcs
MC74ACT08DG	onsemi	Active	Tube	4 µA	4.5V ~ 5.5V	9ns @ 5V, 50pF	-40°C ~ 85°C	3620 Pcs

Engineering Selection Recommendations

For applications currently using the discontinued SN74ACT08D, the following selection criteria apply:

Active Texas Instruments Source: SN74ACT08DR maintains identical quiescent current specification (2 µA) and active product status from the original manufacturer. This part differs only in packaging format (cut tape and digi-reel versus tube). Pin configuration and electrical performance are fully equivalent.

onsemi Alternatives: The 74ACT08SC, 74ACT08SCX, MC74ACT08DR2G, and MC74ACT08DG parts are all active onsemi products meeting all functional and electrical requirements. These parts specify 4 µA maximum quiescent current, which remains within acceptable operating parameters for the 74ACT logic family. All onsemi variants maintain ROHS3 compliance and MSL Level 1 rating.

Packaging Considerations: Selection between tube, cut tape, and tape & reel formats depends on assembly process requirements and volume needs. All packaging options provide the same 14-SOIC form factor and pin compatibility.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SN74ACT08D with SN74ACT08DR in my circuit?

A: Yes. Both parts are Texas Instruments products with identical electrical specifications, including 2 µA quiescent current, 9ns propagation delay, and 14-SOIC package. The only difference is packaging format (tube versus cut tape/digi-reel).

Q: What is the difference between the Texas Instruments and onsemi versions?

A: Both manufacturers produce 74ACT08 logic gates meeting the same functional specifications. The primary difference is quiescent current: Texas Instruments SN74ACT08DR specifies 2 µA maximum, while onsemi parts specify 4 µA maximum. Both values are within acceptable operating ranges for the 74ACT logic family. All parts share identical propagation delay, voltage supply range, and package configuration.

Q: Does the 4 µA quiescent current in onsemi parts affect circuit performance?

A: No. Quiescent current represents standby power consumption when outputs are not switching. The 4 µA specification in onsemi parts remains negligible for most applications and does not affect logic operation, propagation delay, or output drive capability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 rating, matching the original SN74ACT08D specifications.

Q: Which substitute part has the best availability?

A: MC74ACT08DR2G (onsemi) offers the highest inventory at 40,300 pieces in tape & reel packaging. 74ACT08SCX (onsemi) provides 15,691 pieces in cut tape format. Both are suitable for high-volume production requirements.

Q: Can I mix different manufacturers in the same circuit board?

A: Yes. All substitute parts meet identical electrical and mechanical specifications for the 14-SOIC AND gate function. Mixing Texas Instruments and onsemi parts on the same board presents no functional compatibility issues.

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