SN74AHC08D Equivalent & Substitute Parts

Part Overview

The SN74AHC08D 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, making equivalent substitutes necessary for ongoing production and maintenance applications. The SN74AHC08D serves as a fundamental building block in digital logic circuits requiring AND gate functionality across multiple channels with low power consumption and wide supply voltage tolerance.

Key Parameters

Parameter	Value
Logic Type	AND Gate
Number of Circuits	4
Number of Inputs	2
Voltage Supply Range	2V ~ 5.5V
Current - Quiescent (Max)	2 µA
Current - Output High/Low	8mA / 8mA
Input Logic Level - Low	0.5V ~ 1.65V
Input Logic Level - High	1.5V ~ 3.85V
Max Propagation Delay	7.9ns @ 5V, 50pF
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package	14-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN74AHC08D is determined by strict equivalence across the following critical parameters:

Logic type: AND Gate with 4 channels and 2 inputs per channel
Supply voltage range: 2V ~ 5.5V minimum requirement
Output current capability: 8mA minimum for both high and low states
Propagation delay: 7.9ns maximum @ 5V, 50pF load
Package type: 14-SOIC surface mount form factor
Operating temperature range: -40°C ~ 125°C minimum coverage
RoHS3 compliance and MSL Level 1 rating

Substitute parts are grouped into three categories based on their relationship to the original specification:

Direct Substitutes (Identical Electrical & Mechanical Specifications): Parts that match all key parameters without deviation, differing only in packaging format or manufacturer.

Upgrade Substitutes (Enhanced or Equivalent Performance): Parts that meet or exceed the original specifications, offering additional features such as automotive qualification or alternative packaging options while maintaining full functional compatibility.

Manufacturer Recommended Alternatives: Parts recommended by component manufacturers as functional equivalents with minor parameter variations within acceptable engineering tolerances.

Parameter Comparison

Part Number	Manufacturer	Series	Logic Type	Circuits/Inputs	Supply Voltage	Quiescent Current (Max)	Output Current	Propagation Delay	Operating Temp	Package	Status
SN74AHC08D	Texas Instruments	74AHC	AND Gate	4 / 2	2V ~ 5.5V	2 µA	8mA / 8mA	7.9ns @ 5V, 50pF	-40°C ~ 125°C	14-SOIC	Discontinued
SN74AHC08DR	Texas Instruments	74AHC	AND Gate	4 / 2	2V ~ 5.5V	2 µA	8mA / 8mA	7.9ns @ 5V, 50pF	-40°C ~ 125°C	14-SOIC	Active
74VHC08M	Fairchild Semiconductor	74VHC	AND Gate	4 / 2	2V ~ 5.5V	2 µA	8mA / 8mA	7.9ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC	Active
74VHC08MX	onsemi	74VHC	AND Gate	4 / 2	2V ~ 5.5V	2 µA	8mA / 8mA	7.9ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC	Active
MC74VHC08DR2G	onsemi	74VHC	AND Gate	4 / 2	2V ~ 5.5V	2 µA	8mA / 8mA	7.9ns @ 5V, 50pF	-55°C ~ 125°C	14-SOIC	Active
74AHC08D,118	NXP Semiconductors	74AHC	AND Gate	4 / 2	2V ~ 5.5V	2 µA	8mA / 8mA	7.9ns @ 5V, 50pF	-40°C ~ 125°C	14-SOIC	Active
74AHC08D-Q100J	Nexperia USA Inc.	74AHC	AND Gate	4 / 2	2V ~ 5.5V	2 µA	8mA / 8mA	7.9ns @ 5V, 50pF	-40°C ~ 125°C	14-SOIC	Active
74VHC08D,118	Nexperia USA Inc.	74VHC	AND Gate	4 / 2	2V ~ 5.5V	2 µA	8mA / 8mA	7.9ns @ 5V, 50pF	-40°C ~ 125°C	14-SOIC	Active
74AHC08S14-13	Diodes Incorporated	74AHC	AND Gate	4 / 2	2V ~ 5.5V	20 µA	8mA / 8mA	7.5ns @ 5V, 50pF	-40°C ~ 125°C	14-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation: SN74AHC08DR

The SN74AHC08DR from Texas Instruments is the direct substitute for the discontinued SN74AHC08D. It maintains identical electrical specifications and operates across the full -40°C ~ 125°C temperature range. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube), which does not affect circuit performance. This part is currently active in production with 3118 units in stock.

Secondary Recommendation: 74AHC08D,118 (NXP Semiconductors)

The 74AHC08D,118 from NXP Semiconductors provides full functional equivalence with identical electrical parameters and the same -40°C ~ 125°C operating temperature range. This part is actively produced with high inventory availability (49,873 units), making it suitable for high-volume applications.

Alternative for Extended Temperature Range: MC74VHC08DR2G (onsemi)

The MC74VHC08DR2G extends the operating temperature range to -55°C ~ 125°C, providing enhanced performance for applications requiring lower temperature operation. All other electrical parameters remain equivalent to the original specification. This part is active with 3933 units available.

Consideration for Temperature-Limited Applications: 74VHC08M or 74VHC08MX

The 74VHC08M (Fairchild Semiconductor) and 74VHC08MX (onsemi) are suitable substitutes for applications operating within -40°C ~ 85°C. Both maintain identical electrical specifications and 14-SOIC packaging. These options are appropriate only when the upper temperature limit of 85°C is acceptable for the application.

Automotive-Grade Option: 74AHC08D-Q100J (Nexperia USA Inc.)

The 74AHC08D-Q100J carries AEC-Q100 automotive qualification and is suitable for automotive and high-reliability applications. It maintains full electrical equivalence with the original part across the -40°C ~ 125°C range.

Note on 74AHC08S14-13 (Diodes Incorporated)

The 74AHC08S14-13 exhibits a higher quiescent current specification (20 µA versus 2 µA) and slightly faster propagation delay (7.5ns versus 7.9ns). While functionally compatible, the elevated quiescent current may impact power consumption in battery-powered or low-power applications. Selection should be based on specific power budget requirements.

Frequently Asked Questions (FAQ)

Q: Can I use 74VHC08 series parts as direct replacements for the SN74AHC08D?

A: The 74VHC08 series (74VHC08M, 74VHC08MX, 74VHC08D,118) are functionally compatible with identical logic operation and electrical performance. However, most 74VHC08 variants operate only to 85°C maximum, compared to the SN74AHC08D's 125°C upper limit. The MC74VHC08DR2G from onsemi extends to 125°C and is fully equivalent. Selection depends on your application's temperature requirements.

Q: What is the difference between the 74AHC and 74VHC series?

A: Both series implement the same AND gate logic with identical electrical specifications for supply voltage, output current, and propagation delay. The primary difference is manufacturer and product line designation. The 74AHC series is produced by Texas Instruments and Nexperia, while 74VHC is produced by Fairchild Semiconductor and onsemi. Functionally, they are interchangeable within the specified operating parameters.

Q: Does packaging format affect circuit performance?

A: No. The SN74AHC08D (Tube packaging) and SN74AHC08DR (Cut Tape & Digi-Reel) are electrically identical. Packaging format affects only handling, storage, and supply chain logistics. The 14-SOIC form factor remains constant across all listed substitutes.

Q: Is the 74AHC08S14-13 a suitable replacement despite higher quiescent current?

A: The 74AHC08S14-13 is functionally compatible and suitable for most applications. The 20 µA quiescent current (versus 2 µA in the original) represents a 10x increase in standby power consumption. For applications with strict power budgets or extended idle periods, this may be significant. For standard logic applications with continuous operation, the impact is typically negligible.

Q: Can I use the automotive-grade 74AHC08D-Q100J in non-automotive applications?

A: Yes. The 74AHC08D-Q100J meets or exceeds all specifications of the original SN74AHC08D and carries additional AEC-Q100 qualification. It is fully compatible with any application designed for the original part and offers enhanced reliability documentation.

Q: What is the significance of RoHS3 compliance and MSL Level 1?

A: RoHS3 compliance indicates the part meets European Union restrictions on hazardous substances. MSL Level 1 (Unlimited) means the component has no moisture sensitivity limitations and requires no special storage or handling conditions. All listed substitutes carry these same certifications, ensuring regulatory and environmental compatibility.

Q: Are there any pin-to-pin differences between substitute parts?

A: No. All listed substitutes maintain the 14-SOIC package with identical pin assignments and functionality. Pin-to-pin compatibility is guaranteed across all substitutes listed in this reference.

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