SN74HCT08D Equivalent & Substitute Parts

Part Overview

The SN74HCT08D is a 4-channel 2-input AND Gate logic IC manufactured by Texas Instruments in 14-SOIC surface mount packaging. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers. The 74HCT08 logic family provides standard AND gate functionality across multiple semiconductor vendors, with several active substitutes available that maintain electrical and mechanical compatibility.

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	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74HCT08D is determined by the following critical parameters:

Functional Equivalence: All substitute parts must be 4-channel 2-input AND gates with identical logic type and circuit configuration.

Electrical Compatibility: Supply voltage range, input logic levels, output current ratings, and propagation delay specifications must support the original application requirements.

Package Compatibility: All substitutes use 14-SOIC surface mount packaging with identical physical dimensions (0.154", 3.90mm width), ensuring PCB footprint compatibility.

Compliance Requirements: RoHS3 compliance and MSL 1 rating are maintained across all active substitutes.

Product Status: Active substitutes are prioritized over obsolete parts for new designs and procurement.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Supply	Quiescent Current (Max)	Output Current (High/Low)	Propagation Delay @ 5V	Operating Temperature	Package
SN74HCT08D	Texas Instruments	Discontinued	4.5V ~ 5.5V	2 µA	4mA / 4mA	22ns @ 5.5V	-40°C ~ 85°C	14-SOIC
SN74HCT08DR	Texas Instruments	Active	4.5V ~ 5.5V	2 µA	4mA / 4mA	22ns @ 5.5V	-40°C ~ 85°C	14-SOIC
MC74HCT08ADR2G	onsemi	Active	2V ~ 6V	1 µA	4mA / 4mA	17ns @ 5V	-55°C ~ 125°C	14-SOIC
74HCT08D,653	Nexperia USA Inc.	Active	4.5V ~ 5.5V	2 µA	4mA / 4mA	24ns @ 4.5V	-40°C ~ 125°C	14-SOIC
74HCT08D/AUJ	Nexperia USA Inc.	Active	4.5V ~ 5.5V	2 µA	4mA / 5.2mA	24ns @ 4.5V	-40°C ~ 125°C	14-SOIC
74HCT08S14-13	Diodes Incorporated	Active	4.5V ~ 5.5V	20 µA	4mA / 4mA	24ns @ 4.5V	-40°C ~ 125°C	14-SOIC
MC74HCT08ADG	onsemi	Obsolete	2V ~ 6V	1 µA	4mA / 4mA	17ns @ 5V	-55°C ~ 125°C	14-SOIC
MM74HCT08M	Fairchild Semiconductor	Active	4.5V ~ 5.5V	2 µA	4.8mA / 4.8mA	18ns @ 5V	-40°C ~ 85°C	14-SOIC
MM74HCT08MX	Fairchild Semiconductor	Active	4.5V ~ 5.5V	2 µA	4.8mA / 4.8mA	18ns @ 5V	-40°C ~ 85°C	14-SOIC

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

SN74HCT08DR from Texas Instruments provides direct electrical and mechanical equivalence to the original SN74HCT08D, with identical specifications and active product status. This is the preferred substitute when Texas Instruments sourcing is required.

Extended Temperature Range Alternatives:

74HCT08D,653 and 74HCT08D/AUJ from Nexperia USA Inc. offer extended operating temperature ranges (-40°C ~ 125°C) compared to the original part (-40°C ~ 85°C), providing additional thermal margin for demanding applications. Both maintain electrical compatibility within the 4.5V ~ 5.5V supply range.

Enhanced Performance Options:

MC74HCT08ADR2G from onsemi provides superior propagation delay performance (17ns @ 5V) and extended supply voltage range (2V ~ 6V), with extended operating temperature (-55°C ~ 125°C). This part is suitable for applications requiring lower power consumption (1 µA quiescent current) and wider operating conditions.

MM74HCT08M and MM74HCT08MX from Fairchild Semiconductor deliver improved output current capability (4.8mA) and faster propagation delay (18ns @ 5V), maintaining the original temperature range.

Avoid: MC74HCT08ADG is obsolete and should not be selected for new designs despite functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can SN74HCT08DR directly replace SN74HCT08D?

A: Yes. SN74HCT08DR is electrically and mechanically identical to SN74HCT08D, with the same supply voltage range (4.5V ~ 5.5V), output current ratings (4mA / 4mA), propagation delay (22ns @ 5.5V), and 14-SOIC package. The primary difference is product status: SN74HCT08DR is active while SN74HCT08D is discontinued.

Q: What is the difference between 74HCT08D,653 and 74HCT08D/AUJ?

A: Both are Nexperia parts with identical electrical specifications within the 4.5V ~ 5.5V supply range. The difference is in output current low specification: 74HCT08D,653 specifies 4mA while 74HCT08D/AUJ specifies 5.2mA. Both support extended operating temperature (-40°C ~ 125°C).

Q: Why does MC74HCT08ADR2G have different voltage and temperature specifications?

A: MC74HCT08ADR2G is designed for broader application compatibility with supply voltage range 2V ~ 6V and operating temperature -55°C ~ 125°C. These extended specifications do not affect compatibility with standard 5V logic systems but provide additional design flexibility for applications requiring lower supply voltages or extreme temperature operation.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All active substitute parts listed maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original SN74HCT08D specifications.

Q: Can I use 74HCT08S14-13 as a substitute despite higher quiescent current?

A: Yes. The 74HCT08S14-13 from Diodes Incorporated is functionally equivalent with 20 µA quiescent current (higher than the original 2 µA). This higher quiescent current may impact power consumption in battery-powered or low-power applications but does not affect logic functionality or electrical compatibility in standard 5V systems.

Q: Is the 14-SOIC package identical across all substitutes?

A: Yes. All substitute parts use 14-SOIC surface mount packaging with identical physical dimensions (0.154", 3.90mm width), ensuring direct PCB footprint compatibility without layout modifications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message