74HC20D,652 NAND Gate IC Equivalent & Substitute Parts

Part Overview

The 74HC20D,652 is a dual 4-input NAND gate logic IC manufactured by Nexperia USA Inc. in 14-SOIC surface mount packaging. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The 74HC series represents a standard logic family with widespread cross-manufacturer availability, enabling direct functional replacement with compatible alternatives that meet identical electrical specifications.

Key Parameters

Parameter	Value
Logic Type	NAND Gate
Number of Circuits	2
Number of Inputs	4
Supply Voltage Range	2V to 6V
Quiescent Current (Max)	2 µA
Output Current (High/Low)	5.2 mA / 5.2 mA
Input Logic Level Low	0.5V to 1.8V
Input Logic Level High	1.5V to 4.2V
Max Propagation Delay	15 ns @ 6V, 50pF
Operating Temperature	-40°C to 125°C
Package Type	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 74HC20D,652 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Criteria:

Logic type: Dual 4-input NAND gate configuration
Supply voltage range: 2V to 6V minimum
Output current capability: 5.2 mA minimum (both high and low)
Input logic thresholds: 0.5V to 1.8V (low), 1.5V to 4.2V (high)
Package: 14-SOIC surface mount form factor
Mounting type: Surface mount

Acceptable Parameter Variations:

Propagation delay: Up to 19 ns @ 6V, 50pF (original specification: 15 ns)
Quiescent current: Up to 2 µA (original specification: 2 µA)
Operating temperature range: -55°C to 125°C or -40°C to 85°C (both encompass or match original -40°C to 125°C)
RoHS compliance: ROHS3 compliant preferred; non-compliant parts acceptable for legacy applications
Packaging format: Tube, Tape & Reel, or Cut Tape acceptable

All substitute parts listed maintain identical logic functionality, electrical performance within specified tolerances, and physical compatibility with the original 14-SOIC footprint.

Parameter Comparison

Part Number	Manufacturer	Status	Supply Voltage	Quiescent Current (Max)	Propagation Delay @ 6V, 50pF	Operating Temp	RoHS Status	Package
74HC20D,652	Nexperia USA Inc.	Obsolete	2V - 6V	2 µA	15 ns	-40°C to 125°C	ROHS3 Compliant	14-SOIC
CD74HC20M	Harris Corporation	Obsolete	2V - 6V	2 µA	17 ns	-55°C to 125°C	Non-compliant	14-SOIC
CD74HC20M96	Texas Instruments	Active	2V - 6V	2 µA	17 ns	-55°C to 125°C	ROHS3 Compliant	14-SOIC
CD74HC20MT	Texas Instruments	Discontinued at DiGi Electronics	2V - 6V	2 µA	17 ns	-55°C to 125°C	ROHS3 Compliant	14-SOIC
MC74HC20ADG	onsemi	Active	2V - 6V	1 µA	15 ns	-55°C to 125°C	ROHS3 Compliant	14-SOIC
MC74HC20ADR2G	onsemi	Active	2V - 6V	1 µA	15 ns	-55°C to 125°C	ROHS3 Compliant	14-SOIC
SN74HC20D	Texas Instruments	Discontinued at DiGi Electronics	2V - 6V	2 µA	19 ns	-40°C to 85°C	ROHS3 Compliant	14-SOIC
SN74HC20DR	Texas Instruments	Active	2V - 6V	2 µA	19 ns	-40°C to 85°C	ROHS3 Compliant	14-SOIC
SN74HC20DT	Texas Instruments	Discontinued at DiGi Electronics	2V - 6V	2 µA	19 ns	-40°C to 85°C	ROHS3 Compliant	14-SOIC
SN74HC20NSR	Texas Instruments	Active	2V - 6V	2 µA	19 ns	-40°C to 85°C	ROHS3 Compliant	14-SO (5.30mm)

Engineering Selection Recommendations

Primary Recommendation - Active Status Parts:

MC74HC20ADG and MC74HC20ADR2G (onsemi) are the preferred substitutes. Both parts are currently active in production, ROHS3 compliant, and feature superior quiescent current performance (1 µA vs. 2 µA). Propagation delay matches the original specification at 15 ns. The extended operating temperature range (-55°C to 125°C) provides additional thermal margin. MC74HC20ADR2G is supplied in Tape & Reel format suitable for automated assembly; MC74HC20ADG is supplied in Tube format.

Secondary Recommendation - Active Status Parts:

CD74HC20M96 (Texas Instruments) and SN74HC20DR (Texas Instruments) are active alternatives. CD74HC20M96 offers ROHS3 compliance and extended temperature range with 17 ns propagation delay. SN74HC20DR maintains the original temperature specification (-40°C to 85°C) with 19 ns propagation delay. Both are electrically compatible with the original part.

Legacy/Discontinued Alternatives:

SN74HC20D, SN74HC20DT, and CD74HC20MT are discontinued at DiGi Electronics but remain available in inventory. These parts maintain full electrical compatibility and ROHS3 compliance. SN74HC20NSR differs in package width (5.30mm vs. 3.90mm) and should be selected only if PCB layout accommodates the larger footprint.

Non-Compliant Alternative:

CD74HC20M (Harris Corporation) is RoHS non-compliant and obsolete. Selection is appropriate only for legacy applications where RoHS compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can I use SN74HC20NSR as a direct replacement for 74HC20D,652?

A: SN74HC20NSR is electrically equivalent but differs in package dimensions. The original part uses 14-SOIC with 3.90mm width; SN74HC20NSR uses 14-SO with 5.30mm width. Direct PCB substitution is not possible without layout modification. Use only if your PCB footprint accommodates the larger package.

Q: What is the difference between MC74HC20ADG and MC74HC20ADR2G?

A: Both parts are electrically identical with matching specifications. The primary difference is packaging format: MC74HC20ADG is supplied in Tube format for manual handling; MC74HC20ADR2G is supplied in Tape & Reel format optimized for automated pick-and-place assembly. Select based on your assembly process requirements.

Q: Why do some substitute parts have 19 ns propagation delay instead of 15 ns?

A: Propagation delay variation within the 74HC family is a normal manufacturing tolerance. The 19 ns specification (SN74HC20D, SN74HC20DR, SN74HC20DT) remains within acceptable limits for standard logic applications. If your circuit requires the tighter 15 ns specification, select MC74HC20ADG, MC74HC20ADR2G, or CD74HC20M96.

Q: Is the CD74HC20M (Harris) still usable despite RoHS non-compliance?

A: CD74HC20M is functionally equivalent and electrically compatible. RoHS non-compliance means it contains restricted substances. Use only in applications where RoHS compliance is not mandated by design standards, customer requirements, or regulatory frameworks.

Q: Do all substitute parts fit the same PCB footprint?

A: All listed substitutes except SN74HC20NSR use the 14-SOIC package with 3.90mm width and are footprint-compatible. SN74HC20NSR uses 14-SO with 5.30mm width and requires a different footprint. Verify your PCB layout before selection.

Q: Which substitute offers the best long-term availability?

A: MC74HC20ADG and MC74HC20ADR2G (onsemi) and SN74HC20DR (Texas Instruments) are currently active in production. These parts offer the best long-term procurement stability. Discontinued parts (SN74HC20D, SN74HC20DT, CD74HC20MT) have limited remaining inventory.

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