74HCT20D,652 NAND Gate IC Equivalent & Substitute Parts

Part Overview

The 74HCT20D,652 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 74HCT series provides TTL-compatible logic functionality with CMOS technology, operating across a 4.5V to 5.5V supply voltage range.

Key Parameters

Parameter	Value
Manufacturer Part Number	74HCT20D,652
Manufacturer	Nexperia USA Inc.
Logic Type	NAND Gate
Number of Circuits	2
Number of Inputs	4
Voltage - Supply	4.5V ~ 5.5V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	4mA, 4mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	28ns @ 4.5V, 50pF
Operating Temperature	-40°C ~ 125°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74HCT20D,652 is determined by the following critical parameters:

Logic configuration: Dual 4-input NAND gate
Supply voltage range: 4.5V ~ 5.5V
Package type: 14-SOIC surface mount
Input/output logic levels: 0.8V (low), 2V (high)
Output current capability: 4mA high and low
Functional pinout compatibility within the 74HCT20 base product family

Substitute parts must maintain identical logic functionality, package footprint, and electrical interface specifications. Variations in quiescent current, propagation delay, and operating temperature range are permitted within the 74HCT20 series, provided they do not degrade system performance requirements.

Parameter Comparison

Parameter	74HCT20D,652 (Nexperia)	MC74HCT20ADR2G (onsemi)	CD74HCT20M (Harris)	CD74HCT20M96 (TI)	CD74HCT20MT (TI)
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)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
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 active product status, ensuring long-term availability and manufacturing support. It is ROHS3 compliant and carries unlimited moisture sensitivity rating. Electrical parameters are identical to the original 74HCT20D,652, with extended operating temperature range (-55°C to 125°C) providing additional margin for demanding applications.

CD74HCT20MT (Texas Instruments) serves as a secondary option with Last Time Buy status. This part is functionally equivalent to CD74HCT20M96 and maintains ROHS3 compliance. Selection of this part should account for its limited availability window.

MC74HCT20ADR2G (onsemi) is a direct functional substitute with ROHS3 compliance. The quiescent current specification of 10 µA (versus 2 µA for other options) and propagation delay of 42ns at 5V represent acceptable variations within the 74HCT20 series. This part is suitable for applications where the extended quiescent current and slightly higher propagation delay do not impact system performance.

CD74HCT20M (Harris Corporation) is not recommended for new designs due to RoHS non-compliance status, despite functional equivalence and identical electrical performance to the original part.

Frequently Asked Questions (FAQ)

Q: Can I use CD74HCT20M96 as a direct replacement for 74HCT20D,652?

A: Yes. Both parts are dual 4-input NAND gates in 14-SOIC packages with identical logic levels, output current ratings, and propagation delay specifications. The CD74HCT20M96 maintains the same supply voltage range (4.5V ~ 5.5V) and pinout compatibility.

Q: What is the difference between CD74HCT20M96 and CD74HCT20MT?

A: Both parts are manufactured by Texas Instruments with identical electrical specifications. The primary difference is product status: CD74HCT20M96 is Active, while CD74HCT20MT is Last Time Buy. For new designs, CD74HCT20M96 is preferred due to extended availability.

Q: Why does MC74HCT20ADR2G have higher quiescent current?

A: The 10 µA quiescent current specification for MC74HCT20ADR2G (versus 2 µA for other options) reflects manufacturing process variations within the 74HCT20 series. This remains within acceptable limits for most applications and does not affect logic functionality or output drive capability.

Q: Is the 14-SOIC package footprint identical across all substitute parts?

A: Yes. All substitute parts use the 14-SOIC package with 0.154" width and 3.90mm body width, ensuring PCB footprint compatibility without layout modifications.

Q: Should I consider the extended operating temperature range of substitute parts?

A: The substitute parts offer -55°C to 125°C operating range compared to the original -40°C to 125°C. This extended lower temperature limit provides additional design margin and is beneficial for applications in harsh environments. It does not restrict use in standard temperature applications.

Q: Are all substitute parts RoHS compliant?

A: CD74HCT20M96, CD74HCT20MT, and MC74HCT20ADR2G are ROHS3 compliant. CD74HCT20M is RoHS non-compliant and should not be used in applications requiring RoHS certification.

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