MC74ACT08DR2GH Equivalent & Substitute Parts

Part Overview

The MC74ACT08DR2GH is a 4-channel 2-input AND gate logic integrated circuit manufactured by onsemi in a 14-SOIC surface mount package. This device implements four independent AND logic gates with 2 inputs per gate, operating across a 4.5V to 5.5V supply voltage range. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued system support and new design implementations.

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)	4 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

Substitute Part Grouping Explanation

Substitution of the MC74ACT08DR2GH is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Logic Type: AND Gate (4 channels, 2 inputs per channel)
Voltage - Supply: 4.5V ~ 5.5V
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

Mechanical Equivalence Criteria:

Package / Case: 14-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Compliance Criteria:

RoHS Status: ROHS3 Compliant
REACH Status: REACH Unaffected

All identified substitute parts meet these parameters. Variations in Current - Quiescent (Max) between 2 µA and 4 µA remain within acceptable operational margins for this logic gate category and do not preclude substitution. Packaging format differences (Cut Tape & Digi-Reel versus Tape & Reel) represent procurement variations only and do not affect electrical or mechanical compatibility.

Parameter Comparison

Parameter	MC74ACT08DR2GH (Main)	74ACT08SCX	MC74ACT08DR2G	SN74ACT08DR	SN74ACT08DRG3	SN74ACT08IDREP
Manufacturer	onsemi	onsemi	onsemi	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active	Active
Logic Type	AND Gate	AND Gate	AND Gate	AND Gate	AND Gate	AND Gate
Number of Circuits	4	4	4	4	4	4
Number of Inputs	2	2	2	2	2	2
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Max)	4 µA	4 µA	4 µA	2 µA	2 µA	2 µA
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Input Logic Level - Low	0.8V	0.8V	0.8V	0.8V	0.8V	0.8V
Input Logic Level - High	2V	2V	2V	2V	2V	2V
Max Propagation Delay @ V, Max CL	9ns @ 5V, 50pF	9ns @ 5V, 50pF	9ns @ 5V, 50pF	9ns @ 5V, 50pF	9ns @ 5V, 50pF	9ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (onsemi Manufacturer):

The 74ACT08SCX and MC74ACT08DR2G are direct onsemi equivalents maintaining identical quiescent current specifications (4 µA) to the obsolete MC74ACT08DR2GH. Both parts are active products with ROHS3 compliance and REACH unaffected status. The MC74ACT08DR2G offers higher inventory availability (40,300 units) in Tape & Reel packaging, suitable for high-volume production environments. The 74ACT08SCX provides 15,691 units in Cut Tape & Digi-Reel format, appropriate for mixed-volume or prototype applications.

Secondary Substitutes (Texas Instruments Manufacturer):

The SN74ACT08DR, SN74ACT08DRG3, and SN74ACT08IDREP are Texas Instruments equivalents with identical electrical and mechanical specifications. These parts feature lower quiescent current (2 µA), representing improved power efficiency while maintaining full functional compatibility. All three are active products with ROHS3 compliance and REACH unaffected status. The SN74ACT08DRG3 provides the highest inventory level among Texas Instruments options (8,463 units) in Cut Tape & Digi-Reel packaging.

Compliance Status:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original MC74ACT08DR2GH specification.

Frequently Asked Questions (FAQ)

Q: Can the MC74ACT08DR2GH be directly replaced with any of the listed substitutes?

A: Yes. All listed substitute parts meet the electrical and mechanical specifications of the MC74ACT08DR2GH. The 14-SOIC package dimensions, logic function, voltage supply range, input/output levels, propagation delay, and operating temperature range are identical across all alternatives.

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

A: The primary difference is quiescent current specification. onsemi parts (74ACT08SCX, MC74ACT08DR2G) maintain 4 µA maximum quiescent current matching the original part. Texas Instruments parts (SN74ACT08DR, SN74ACT08DRG3, SN74ACT08IDREP) specify 2 µA maximum quiescent current, offering lower power consumption. All other electrical parameters are identical.

Q: Does packaging format affect compatibility?

A: Packaging format (Cut Tape & Digi-Reel versus Tape & Reel) represents procurement and handling differences only. The physical component package (14-SOIC) and electrical specifications remain unchanged. Selection should be based on production volume requirements and supply chain preferences.

Q: Are all substitutes suitable for new designs?

A: Yes. All substitute parts carry active product status with ROHS3 compliance and REACH unaffected certification, making them appropriate for new design implementations and long-term production support.

Q: What inventory levels are available for each substitute?

A: MC74ACT08DR2G offers the highest availability at 40,300 units. 74ACT08SCX provides 15,691 units. Among Texas Instruments options, SN74ACT08DRG3 offers 8,463 units, SN74ACT08DR provides 2,179 units, and SN74ACT08IDREP offers 646 units.

Q: Can the lower quiescent current of Texas Instruments parts affect circuit operation?

A: No. The 2 µA quiescent current specification of Texas Instruments parts is a subset of the 4 µA maximum specification. Lower quiescent current represents improved efficiency and does not impact functional operation or compatibility.

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