74HCT20D,653 NAND Gate IC Equivalent & Substitute Parts

Part Overview

The 74HCT20D,653 is a dual 4-input NAND gate logic IC manufactured by Nexperia USA Inc. in a 14-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The 74HCT20 series provides standard TTL-compatible logic functionality suitable for digital circuit applications requiring NAND gate operations.

Key Parameters

Parameter	Value
Logic Type	NAND Gate
Number of Circuits	2
Number of Inputs	4
Voltage Supply Range	4.5V ~ 5.5V
Package Type	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Operating Temperature Range	-40°C ~ 125°C
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Current - Output High, Low	4mA, 4mA

Substitute Part Grouping Explanation

Substitution for the 74HCT20D,653 is determined by the following critical parameters:

Logic Function: Dual 4-input NAND gate configuration
Package Compatibility: 14-SOIC surface mount package with identical pinout
Voltage Supply: 4.5V ~ 5.5V operating range
Input/Output Electrical Characteristics: Input logic levels (0.8V low, 2V high) and output current ratings (4mA)
Mounting Type: Surface mount technology

All substitute parts listed maintain these core electrical and mechanical specifications, ensuring functional and physical compatibility. Differences in quiescent current, propagation delay, and temperature range are noted but do not prevent substitution within the defined parameter envelope.

Parameter Comparison

Parameter	74HCT20D,653 (Nexperia)	MC74HCT20ADR2G (onsemi)	CD74HCT20M (Harris)	CD74HCT20M96 (TI)	CD74HCT20MT (TI)
Manufacturer	Nexperia USA Inc.	onsemi	Harris Corporation	Texas Instruments	Texas Instruments
Logic Type	NAND Gate	NAND Gate	NAND Gate	NAND Gate	NAND Gate
Number of Circuits	2	2	2	2	2
Number of Inputs	4	4	4	4	4
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Max)	2 µA	10 µA	2 µA	2 µA	2 µA
Current - Output High, Low	4mA, 4mA	4mA, 4mA	4mA, 4mA	4mA, 4mA	4mA, 4mA
Input Logic Level - Low	0.8V	0.8V	0.8V	0.8V	0.8V
Input Logic Level - High	2V	2V	2V	2V	2V
Max Propagation Delay @ V, Max CL	28ns @ 4.5V, 50pF	42ns @ 5V, 50pF	28ns @ 4.5V, 50pF	28ns @ 4.5V, 50pF	28ns @ 4.5V, 50pF
Operating Temperature	-40°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete	Obsolete	Obsolete	Active	Last Time Buy
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

CD74HCT20M96 (Texas Instruments) is the primary recommended substitute. This part maintains identical electrical specifications to the original 74HCT20D,653, including quiescent current (2 µA) and propagation delay (28ns @ 4.5V, 50pF). The part carries Active product status, ensuring long-term availability and supply chain stability. It is ROHS3 compliant and available in Tape & Reel packaging with 2810 units in stock.

CD74HCT20MT (Texas Instruments) serves as a secondary option with equivalent electrical performance. This part is designated Last Time Buy status, indicating limited future availability. It maintains the same electrical characteristics as the original part and is ROHS3 compliant.

CD74HCT20M (Harris Corporation) provides functional equivalence but carries RoHS non-compliance status. This part is suitable only for applications where RoHS compliance is not required. It is packaged in Tube format with 2144 units available.

MC74HCT20ADR2G (onsemi) is functionally compatible but exhibits higher quiescent current (10 µA versus 2 µA) and longer propagation delay (42ns @ 5V versus 28ns @ 4.5V). This part is suitable for applications where these performance differences are acceptable. It is ROHS3 compliant with 810 units in stock.

Frequently Asked Questions (FAQ)

Q: Can I use MC74HCT20ADR2G as a direct replacement for 74HCT20D,653?

A: Yes, MC74HCT20ADR2G is electrically and mechanically compatible. However, it exhibits higher quiescent current (10 µA) and longer propagation delay (42ns) compared to the original part (2 µA, 28ns). Applications sensitive to power consumption or timing margins should account for these differences.

Q: What is the difference between CD74HCT20M96 and CD74HCT20MT?

A: Both parts are manufactured by Texas Instruments and maintain identical electrical specifications. CD74HCT20M96 is Active status with Tape & Reel packaging, while CD74HCT20MT is Last Time Buy status with Tape & Reel packaging. CD74HCT20M96 is recommended for new designs requiring long-term supply assurance.

Q: Is CD74HCT20M suitable for RoHS-compliant applications?

A: No. CD74HCT20M is RoHS non-compliant. For RoHS-compliant designs, use CD74HCT20M96, CD74HCT20MT, or MC74HCT20ADR2G.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts are available in 14-SOIC (0.154", 3.90mm Width) surface mount packages with identical pinout, ensuring direct PCB compatibility.

Q: What is the operating temperature range difference between the original part and substitutes?

A: The original 74HCT20D,653 operates from -40°C to 125°C. All substitute parts extend the lower temperature limit to -55°C, providing broader environmental operating capability.

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