SN74AHCT08DBR Equivalent & Substitute Parts

Part Overview

The SN74AHCT08DBR is a 4-channel AND gate logic IC manufactured by Texas Instruments, packaged in 14-SSOP surface mount configuration. This device is classified as an active product and is widely used in digital logic applications requiring AND gate functionality. Substitute parts are identified when equivalent electrical performance and functional characteristics are required due to inventory constraints, supply chain considerations, or design flexibility needs.

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	8mA, 8mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	7.9ns @ 5V, 50pF
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SN74AHCT08DBR are qualified based on the following criteria:

Electrical Equivalence: All substitute parts maintain identical logic functionality (4-channel AND gate with 2 inputs per channel), supply voltage range (4.5V ~ 5.5V), quiescent current (2 µA max), output current capability (8mA), input logic levels (0.8V low, 2V high), and propagation delay (7.9ns @ 5V, 50pF).

Mechanical Compatibility: Substitute parts are surface mount devices in 14-pin TSSOP or SSOP packages, maintaining compatible footprint dimensions and pin configurations.

Compliance & Certification: All substitute parts maintain ROHS3 compliance and EAR99 ECCN classification, ensuring regulatory alignment with the original part.

Series Variations: The 74AHCT series (Texas Instruments, Nexperia) and 74VHCT series (Fairchild Semiconductor) are functionally equivalent logic families with identical electrical specifications for this gate configuration.

Parameter Comparison

Parameter	SN74AHCT08DBR (Main)	74AHCT08PW,118 (Nexperia)	74VHCT08AMTCX (Fairchild)
Manufacturer	Texas Instruments	Nexperia USA Inc.	Fairchild Semiconductor
Logic Type	AND Gate	AND Gate	AND Gate
Number of Circuits	4	4	4
Number of Inputs	2	2	2
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Max)	2 µA	2 µA	2 µA
Current - Output High, Low	8mA, 8mA	8mA, 8mA	8mA, 8mA
Input Logic Level - Low	0.8V	0.8V	0.8V
Input Logic Level - High	2V	2V	2V
Max Propagation Delay @ V, Max CL	7.9ns @ 5V, 50pF	7.9ns @ 5V, 50pF	7.9ns @ 5V, 50pF
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	14-SSOP (0.209", 5.30mm Width)	14-TSSOP (0.173", 4.40mm Width)	14-TSSOP (0.173", 4.40mm Width)
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Not specified

Engineering Selection Recommendations

74AHCT08PW,118 (Nexperia USA Inc.): This substitute maintains full electrical equivalence with the SN74AHCT08DBR across all specified parameters, including operating temperature range (-40°C ~ 125°C), supply voltage, logic levels, and propagation delay. Both devices are ROHS3 compliant and carry MSL 1 rating. The primary difference is packaging: 14-TSSOP (0.173", 4.40mm width) versus 14-SSOP (0.209", 5.30mm width). PCB layout compatibility must be verified for package footprint differences. This part is suitable for direct substitution in applications where the TSSOP footprint is accommodated.

74VHCT08AMTCX (Fairchild Semiconductor): This substitute provides electrical equivalence in logic function, supply voltage, quiescent current, output current, input logic levels, and propagation delay. The operating temperature range is limited to -40°C ~ 85°C, which is narrower than the main part's -40°C ~ 125°C specification. This part is suitable for substitution only in applications where the maximum operating temperature does not exceed 85°C. Packaging is 14-TSSOP (0.173", 4.40mm width), requiring PCB layout verification. Product status is active and ECCN classification matches the main part.

Frequently Asked Questions (FAQ)

Q: Can 74AHCT08PW,118 be used as a direct replacement for SN74AHCT08DBR?

A: Electrical substitution is valid. Both parts are 4-channel AND gates with identical logic specifications, supply voltage (4.5V ~ 5.5V), quiescent current (2 µA), output current (8mA), input logic levels, and propagation delay (7.9ns @ 5V, 50pF). Operating temperature ranges are identical (-40°C ~ 125°C). The primary consideration is package footprint: 14-TSSOP versus 14-SSOP. PCB layout must accommodate the different package dimensions (0.173" vs 0.209" width).

Q: What is the key difference between 74VHCT08AMTCX and the main part?

A: The 74VHCT08AMTCX operates within a narrower temperature range (-40°C ~ 85°C) compared to the SN74AHCT08DBR (-40°C ~ 125°C). All other electrical parameters are equivalent. This part is suitable only for applications where maximum operating temperature does not exceed 85°C.

Q: Are all substitute parts ROHS3 compliant?

A: The 74AHCT08PW,118 is explicitly ROHS3 compliant. The 74VHCT08AMTCX RoHS status is not specified in the provided data. Compliance verification is required before selection for applications with RoHS requirements.

Q: What packaging options are available?

A: The SN74AHCT08DBR is supplied in 14-SSOP (0.209", 5.30mm width). Substitute parts are available in 14-TSSOP (0.173", 4.40mm width). Both are surface mount packages. PCB footprint compatibility must be confirmed during design review.

Q: Can these parts be used interchangeably in high-temperature applications?

A: The SN74AHCT08DBR and 74AHCT08PW,118 both support -40°C ~ 125°C operation and are suitable for high-temperature applications. The 74VHCT08AMTCX is limited to -40°C ~ 85°C and is not suitable for applications requiring operation above 85°C.

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