SN74AHCT08MDREP Equivalent & Substitute Parts

Part Overview

The SN74AHCT08MDREP is a 4-channel AND gate logic IC manufactured by Texas Instruments in 14-SOIC surface mount packaging. This device is classified as an active product and is widely used in digital logic applications requiring AND gate functionality. Substitute parts are identified based on matching electrical characteristics, logic functionality, and compatible packaging options to support design flexibility and supply chain alternatives.

Key Parameters

Parameter	Value
Logic Type	AND Gate
Number of Circuits	4
Number of Inputs	2
Voltage Supply Range	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 @ 5V, 50pF	7.9ns
Operating Temperature	-55°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SN74AHCT08MDREP are qualified based on the following criteria:

Electrical Compatibility: All substitute parts maintain identical logic functionality (4-channel AND gate with 2 inputs per channel), supply voltage range (4.5V ~ 5.5V), output current ratings (8mA high/low), and input logic levels (0.8V low, 2V high).

Propagation Delay: Substitute parts meet or exceed the maximum propagation delay specification of 7.9ns at 5V with 50pF load.

Packaging Options: Substitutes are available in 14-SOIC and 14-TSSOP surface mount packages, both compatible with standard PCB assembly processes.

Compliance & Status: All substitute parts maintain active product status, ROHS3 compliance, and MSL Level 1 rating.

Temperature Range Variations: Some substitutes operate within -40°C ~ 125°C, which is narrower than the main part's -55°C ~ 125°C range. Selection depends on application temperature requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Logic Type	Circuits / Inputs	Supply Voltage	Quiescent Current (Max)	Output Current (H/L)	Propagation Delay @ 5V, 50pF	Operating Temperature	Package	Product Status
SN74AHCT08MDREP	Texas Instruments	AND Gate	4 / 2	4.5V ~ 5.5V	2 µA	8mA, 8mA	7.9ns	-55°C ~ 125°C	14-SOIC	Active
MC74VHCT08ADR2G	onsemi	AND Gate	4 / 2	4.5V ~ 5.5V	2 µA	8mA, 8mA	7.9ns	-40°C ~ 125°C	14-SOIC	Active
MC74VHCT08ADTR2G	onsemi	AND Gate	4 / 2	4.5V ~ 5.5V	2 µA	8mA, 8mA	7.9ns	-40°C ~ 125°C	14-TSSOP	Active
74AHCT08S14-13	Diodes Incorporated	AND Gate	4 / 2	4.5V ~ 5.5V	20 µA	8mA, 8mA	10ns	-40°C ~ 125°C	14-SO	Active
74AHCT08D,118	NXP Semiconductors	AND Gate	4 / 2	4.5V ~ 5.5V	—	8mA, 8mA	—	—	Bulk	Active

Engineering Selection Recommendations

MC74VHCT08ADR2G (onsemi, 14-SOIC): Direct package equivalent with identical electrical performance. Suitable for applications operating within -40°C ~ 125°C temperature range. Recommended for designs requiring onsemi component qualification or supply chain diversification.

MC74VHCT08ADTR2G (onsemi, 14-TSSOP): Functionally equivalent with alternative 14-TSSOP packaging. Provides space-saving option for PCB layouts requiring smaller footprint. Operating temperature range -40°C ~ 125°C. Recommended for compact design requirements.

74AHCT08S14-13 (Diodes Incorporated, 14-SO): Functionally equivalent AND gate with slightly elevated quiescent current (20 µA vs. 2 µA) and propagation delay (10ns vs. 7.9ns). Operating temperature range -40°C ~ 125°C. Suitable for applications where these parameter variations are acceptable and Diodes Incorporated qualification is required.

74AHCT08D,118 (NXP Semiconductors, Bulk): Functionally equivalent base product available in bulk packaging. Recommended for high-volume production environments where tape & reel packaging is not required. Complete electrical specifications align with primary application requirements.

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and active product status, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can MC74VHCT08ADR2G replace SN74AHCT08MDREP in all applications?

A: MC74VHCT08ADR2G is electrically equivalent with identical logic functionality, supply voltage, output current, and propagation delay. The operating temperature range is -40°C ~ 125°C versus -55°C ~ 125°C for the SN74AHCT08MDREP. Verify application temperature requirements before substitution.

Q: What is the difference between MC74VHCT08ADR2G and MC74VHCT08ADTR2G?

A: Both parts are functionally identical. The primary difference is packaging: MC74VHCT08ADR2G uses 14-SOIC (0.154" width), while MC74VHCT08ADTR2G uses 14-TSSOP (0.173" width). Select based on PCB layout requirements and assembly equipment compatibility.

Q: Why does 74AHCT08S14-13 have higher quiescent current and propagation delay?

A: 74AHCT08S14-13 maintains functional AND gate operation within specified parameters but exhibits 20 µA quiescent current (versus 2 µA) and 10ns propagation delay (versus 7.9ns). These variations remain within acceptable logic IC tolerances. Verify application power budget and timing margins before selection.

Q: Is 74AHCT08D,118 suitable for automated assembly?

A: 74AHCT08D,118 is supplied in bulk packaging, not tape & reel format. This part is recommended for high-volume production environments with manual or specialized bulk component handling systems. For standard SMT assembly lines, tape & reel packaged alternatives are preferred.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 rating, meeting current environmental and reliability standards.

Q: Can I use these substitutes interchangeably on the same PCB?

A: MC74VHCT08ADR2G and SN74AHCT08MDREP share identical 14-SOIC packaging and can be used interchangeably. MC74VHCT08ADTR2G requires 14-TSSOP footprint compatibility. 74AHCT08S14-13 uses 14-SO packaging. Verify PCB footprint design before substitution.

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