MM74HCT08N AND Gate IC Equivalent & Substitute Parts

Part Overview

The MM74HCT08N is a 4-channel 2-input AND gate logic IC manufactured by onsemi in a 14-MDIP package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The 74HCT series provides TTL-compatible logic functionality suitable for digital circuit applications requiring AND gate operations across multiple channels.

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
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	14-DIP (0.300", 7.62mm)
Base Product Number	74HCT08

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HCT08N is determined by the following critical parameters:

Logic function: 4-channel 2-input AND gate configuration
Supply voltage range: 4.5V ~ 5.5V
Input logic thresholds: Low 0.8V, High 2V
Quiescent current: 2 µA maximum
Package type: 14-DIP through-hole mounting
Base series: 74HCT

All substitute parts must maintain identical logic configuration, voltage specifications, and input/output electrical characteristics. Package compatibility requires 14-DIP form factor with 0.300" (7.62mm) pitch. Propagation delay variations are acceptable within the 74HCT series specification range.

Parameter Comparison

Parameter	MM74HCT08N (onsemi)	CD74HCT08E (Harris)	SN74HCT08N (TI)
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	4.8mA, 4.8mA	4mA, 4mA	4mA, 4mA
Input Logic Level - Low	0.8V	0.8V	0.8V
Input Logic Level - High	2V	2V	2V
Max Propagation Delay @ V, Max CL	18ns @ 5V, 50pF	25ns @ 4.5V, 50pF	22ns @ 5.5V, 50pF
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)
Base Product Number	74HCT08	74HCT08	74HCT08
Product Status	Obsolete	Obsolete	Active

Engineering Selection Recommendations

SN74HCT08N (Texas Instruments) is the preferred substitute for new designs and ongoing procurement. This part maintains active product status, ensuring long-term availability and supply chain stability. The SN74HCT08N is ROHS3 compliant, meeting current environmental and regulatory requirements. Electrical performance is equivalent to the MM74HCT08N across all critical parameters, with propagation delay of 22ns at 5.5V within acceptable operating margins.

CD74HCT08E (Harris Corporation) is functionally equivalent but carries obsolete status. This part offers extended operating temperature range (-55°C ~ 125°C) compared to the MM74HCT08N, making it suitable for applications requiring wider temperature performance. However, RoHS non-compliance status limits its use in regulated applications. The CD74HCT08E is available in tube packaging.

Both substitute parts are pin-compatible with the MM74HCT08N and require no circuit modifications for direct replacement in 14-DIP through-hole applications.

Frequently Asked Questions (FAQ)

Q: Can SN74HCT08N directly replace MM74HCT08N without circuit modifications?

A: Yes. Both parts share identical pin configuration, logic function (4-channel 2-input AND gate), supply voltage range (4.5V ~ 5.5V), and input/output electrical specifications. Direct socket substitution is possible in 14-DIP through-hole designs.

Q: What is the difference in propagation delay between these parts?

A: MM74HCT08N specifies 18ns at 5V with 50pF load. SN74HCT08N specifies 22ns at 5.5V with 50pF load. CD74HCT08E specifies 25ns at 4.5V with 50pF load. These variations remain within the 74HCT series performance envelope and do not affect functional compatibility in standard logic applications.

Q: Why is SN74HCT08N recommended over CD74HCT08E?

A: SN74HCT08N maintains active product status with ROHS3 compliance, ensuring regulatory alignment and supply continuity. CD74HCT08E is obsolete and RoHS non-compliant, limiting suitability for new designs and regulated applications.

Q: Are there package differences between these parts?

A: All three parts use 14-DIP (0.300", 7.62mm) through-hole packaging. CD74HCT08E is supplied in tube packaging, while MM74HCT08N and SN74HCT08N may vary by supplier. Package form factor is identical for PCB mounting.

Q: What is the operating temperature range for each part?

A: MM74HCT08N and SN74HCT08N operate from -40°C to 85°C. CD74HCT08E operates from -55°C to 125°C, providing extended temperature capability for demanding thermal environments.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, within the specified electrical and thermal operating ranges. All three parts meet the 74HCT08 base product specification for 4-channel 2-input AND gate logic with TTL-compatible input/output levels.

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