74HCT08DR2G AND Gate IC Equivalent & Substitute Parts

Part Overview

The 74HCT08DR2G is a 4-channel 2-input AND gate logic IC manufactured by onsemi in 14-SOIC surface mount packaging. This component is classified as obsolete, which necessitates identification of functionally equivalent substitute parts for ongoing design support and procurement continuity. The 74HCT08 series maintains consistent logic functionality across multiple manufacturers and packaging variants, enabling direct substitution based on electrical and mechanical parameter alignment.

Key Parameters

Parameter	Value
Logic Type	AND Gate
Number of Circuits	4
Number of Inputs	2
Voltage Supply Range	4.5V ~ 5.5V
Package Type	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 125°C
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Current - Output High, Low	4mA, 4mA
Current - Quiescent (Max)	2 µA
Max Propagation Delay @ V, Max CL	15ns @ 4.5V, 50pF

Substitute Part Grouping Explanation

Substitution of the 74HCT08DR2G is determined by the following critical parameters:

Logic Function: All substitute parts must implement 4-channel 2-input AND gate logic
Package Compatibility: 14-SOIC surface mount package with 0.154" (3.90mm) width
Voltage Supply Range: Minimum 4.5V to 5.5V operation
Input/Output Logic Levels: 0.8V low threshold, 2V high threshold, 4mA output capability
Operating Temperature Range: Support for -55°C to 125°C or compatible subset
Propagation Delay: Maximum 25ns at specified conditions

Substitute parts are grouped into two categories: Active Status parts (recommended for new designs) and Obsolete/Discontinued parts (available for legacy system support). Parts with extended voltage supply ranges (2V ~ 6V) or relaxed temperature specifications remain functionally compatible within the 74HCT08DR2G operating envelope.

Parameter Comparison

Part Number	Manufacturer	Status	Voltage Supply	Quiescent Current (Max)	Output Current (High/Low)	Propagation Delay @ Conditions	Operating Temp	Package
74HCT08DR2G	onsemi	Obsolete	4.5V ~ 5.5V	2 µA	4mA / 4mA	15ns @ 4.5V, 50pF	-55°C ~ 125°C	14-SOIC
MC74HCT08ADR2G	onsemi	Active	2V ~ 6V	1 µA	4mA / 4mA	17ns @ 5V, 50pF	-55°C ~ 125°C	14-SOIC
MM74HCT08M	Fairchild Semiconductor	Active	4.5V ~ 5.5V	2 µA	4.8mA / 4.8mA	18ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC
MM74HCT08MX	Fairchild Semiconductor	Active	4.5V ~ 5.5V	2 µA	4.8mA / 4.8mA	18ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC
74HCT08D/AUJ	Nexperia USA Inc.	Active	4.5V ~ 5.5V	2 µA	4mA / 5.2mA	24ns @ 4.5V, 50pF	-40°C ~ 125°C	14-SOIC
CD74HCT08M	Harris Corporation	Obsolete	4.5V ~ 5.5V	2 µA	4mA / 4mA	25ns @ 4.5V, 50pF	-55°C ~ 125°C	14-SOIC
CD74HCT08M96	Texas Instruments	Active	4.5V ~ 5.5V	2 µA	4mA / 4mA	25ns @ 4.5V, 50pF	-55°C ~ 125°C	14-SOIC
CD74HCT08ME4	Texas Instruments	Discontinued at DiGi Electronics	4.5V ~ 5.5V	2 µA	4mA / 4mA	25ns @ 4.5V, 50pF	-55°C ~ 125°C	14-SOIC
SN74HCT08D	Texas Instruments	Discontinued at DiGi Electronics	4.5V ~ 5.5V	2 µA	4mA / 4mA	22ns @ 5.5V, 50pF	-40°C ~ 85°C	14-SOIC
SN74HCT08DR	Texas Instruments	Active	4.5V ~ 5.5V	2 µA	4mA / 4mA	22ns @ 5.5V, 50pF	-40°C ~ 85°C	14-SOIC

Engineering Selection Recommendations

Primary Recommendation for New Designs: MC74HCT08ADR2G (onsemi, Active status) provides the best forward compatibility with extended voltage supply range (2V ~ 6V), lower quiescent current (1 µA), and active product status with RoHS3 compliance. This part maintains full electrical equivalence within the 74HCT08DR2G operating envelope while offering improved power efficiency.

Alternative for Strict Parameter Matching: CD74HCT08M96 (Texas Instruments, Active status) matches the original 74HCT08DR2G electrical specifications precisely, including voltage supply range (4.5V ~ 5.5V), quiescent current (2 µA), and propagation delay (25ns @ 4.5V, 50pF). This part carries RoHS3 compliance and active product status with highest inventory availability (27,700 units).

For Extended Temperature Range Applications: 74HCT08D/AUJ (Nexperia USA Inc., Active status) supports the full -55°C to 125°C operating range of the original part while maintaining active product status and RoHS3 compliance. Propagation delay extends to 24ns, remaining within acceptable timing margins.

Legacy System Support: CD74HCT08M (Harris Corporation, Obsolete status) and SN74HCT08D (Texas Instruments, Discontinued) remain available in inventory but should not be selected for new designs due to discontinued status.

Frequently Asked Questions (FAQ)

Q: Can MC74HCT08ADR2G replace 74HCT08DR2G in existing designs?

A: Yes. MC74HCT08ADR2G is a direct functional substitute. The extended voltage supply range (2V ~ 6V) encompasses the original 4.5V ~ 5.5V specification. Lower quiescent current (1 µA vs. 2 µA) improves power efficiency. Propagation delay (17ns @ 5V) is faster than the original (15ns @ 4.5V). Pin configuration and package dimensions are identical.

Q: What is the difference between 14-SOIC and 14-SO packaging?

A: Both designations refer to 14-pin Small Outline IC packages with 0.154" (3.90mm) width. The terms are used interchangeably in industry documentation. All listed substitute parts are mechanically compatible with 14-SOIC footprints.

Q: Why do some parts have different operating temperature ranges?

A: Operating temperature range is a manufacturing specification that does not affect functional equivalence within overlapping ranges. The original 74HCT08DR2G supports -55°C ~ 125°C. Substitutes with -40°C ~ 85°C ranges are suitable for applications operating within this narrower window. For full -55°C ~ 125°C coverage, select CD74HCT08M96, 74HCT08D/AUJ, or CD74HCT08M.

Q: Are there compliance differences between substitute parts?

A: Yes. MC74HCT08ADR2G and CD74HCT08M96 carry RoHS3 compliance. CD74HCT08M (Harris) is RoHS non-compliant. For applications requiring RoHS compliance, select from active-status parts with documented RoHS3 certification.

Q: Which substitute offers the best propagation delay performance?

A: 74HCT08DR2G achieves 15ns @ 4.5V, 50pF. MC74HCT08ADR2G achieves 17ns @ 5V, 50pF. SN74HCT08DR achieves 22ns @ 5.5V, 50pF. For timing-critical applications, MC74HCT08ADR2G provides the closest performance match with active product status.

Q: Can I use MM74HCT08M or MM74HCT08MX if my application operates below -40°C?

A: No. MM74HCT08M and MM74HCT08MX specify -40°C ~ 85°C operating range. Applications requiring -55°C operation must use CD74HCT08M96, 74HCT08D/AUJ, or CD74HCT08M.

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