74HC21D,652 Equivalent & Substitute Parts

Part Overview

The 74HC21D,652 is a dual 4-input AND 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 procurement.

The 74HC21 series provides two independent AND gate circuits, each with four inputs, operating across a 2V to 6V supply voltage range. The part is RoHS3 compliant and suitable for general-purpose logic applications requiring AND gate functionality in compact form factors.

Key Parameters

Parameter	Value
Logic Type	AND Gate
Number of Circuits	2
Number of Inputs	4
Voltage - Supply	2V ~ 6V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	5.2mA, 5.2mA
Input Logic Level - Low	0.5V ~ 1.8V
Input Logic Level - High	1.5V ~ 4.2V
Max Propagation Delay @ 6V, 50pF	19ns
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74HC21D,652 is determined by the following critical parameters:

Logic Function: Dual 4-input AND gate configuration
Electrical Specifications: Supply voltage (2V ~ 6V), quiescent current (2 µA max), output current (5.2mA), propagation delay (19ns @ 6V, 50pF), and input logic levels
Package Compatibility: 14-SOIC surface mount package with 0.154" width
Operating Temperature Range: Minimum -40°C support required
Compliance: RoHS3 compliance and MSL Level 1

Substitute parts are grouped into three categories based on product status and operational temperature range:

Direct Substitutes (Active Status): Parts maintaining identical electrical specifications and -40°C minimum operating temperature with current availability.

Upgrade Substitutes (Extended Temperature): Parts offering extended operating temperature range (-55°C minimum) with identical electrical performance, suitable for enhanced reliability in demanding environments.

Similar Substitutes (Limited Temperature): Parts with restricted operating temperature range (-40°C to 85°C) or discontinued status, applicable only when temperature constraints permit.

Parameter Comparison

Part Number	Manufacturer	Product Status	Logic Type	Circuits / Inputs	Supply Voltage	Quiescent Current	Output Current	Propagation Delay	Operating Temp	Package	Packaging Type
74HC21D,652	Nexperia USA Inc.	Obsolete	AND Gate	2 / 4	2V ~ 6V	2 µA	5.2mA, 5.2mA	19ns @ 6V, 50pF	-40°C ~ 125°C	14-SOIC (0.154")	-
SN74HC21QDRQ1	Texas Instruments	Active	AND Gate	2 / 4	2V ~ 6V	2 µA	5.2mA, 5.2mA	19ns @ 6V, 50pF	-40°C ~ 125°C	14-SOIC (0.154")	Cut Tape (CT) & Digi-Reel®
CD74HC21M96	Texas Instruments	Active	AND Gate	2 / 4	2V ~ 6V	2 µA	5.2mA, 5.2mA	19ns @ 6V, 50pF	-55°C ~ 125°C	14-SOIC (0.154")	Tape & Reel (TR)
CD74HC21M	Texas Instruments	Discontinued at DiGi Electronics	AND Gate	2 / 4	2V ~ 6V	2 µA	5.2mA, 5.2mA	19ns @ 6V, 50pF	-55°C ~ 125°C	14-SOIC (0.154")	Tube
CD74HC21MT	Texas Instruments	Discontinued at DiGi Electronics	AND Gate	2 / 4	2V ~ 6V	2 µA	5.2mA, 5.2mA	19ns @ 6V, 50pF	-55°C ~ 125°C	14-SOIC (0.154")	Tape & Reel (TR)
SN74HC21DR	Texas Instruments	Active	AND Gate	2 / 4	2V ~ 6V	2 µA	5.2mA, 5.2mA	19ns @ 6V, 50pF	-40°C ~ 85°C	14-SOIC (0.154")	Cut Tape (CT) & Digi-Reel®
SN74HC21D	Texas Instruments	Discontinued at DiGi Electronics	AND Gate	2 / 4	2V ~ 6V	2 µA	5.2mA, 5.2mA	19ns @ 6V, 50pF	-40°C ~ 85°C	14-SOIC (0.154")	Tube
SN74HC21DT	Texas Instruments	Discontinued at DiGi Electronics	AND Gate	2 / 4	2V ~ 6V	2 µA	5.2mA, 5.2mA	19ns @ 6V, 50pF	-40°C ~ 85°C	14-SOIC (0.154")	Tape & Reel (TR)
SN74HC21NSR	Texas Instruments	Active	AND Gate	2 / 4	2V ~ 6V	2 µA	5.2mA, 5.2mA	19ns @ 6V, 50pF	-40°C ~ 85°C	14-SOIC (0.209")	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Selection: SN74HC21QDRQ1 is the recommended direct substitute. It maintains identical electrical specifications and operating temperature range (-40°C ~ 125°C) as the original 74HC21D,652, with active product status and automotive-grade qualification (AEC-Q100). This part is currently in stock with 4914 units available.

Extended Temperature Applications: CD74HC21M96 is suitable for applications requiring extended low-temperature operation (-55°C minimum). This part is active and available in Tape & Reel packaging with 9067 units in stock. The expanded temperature range provides enhanced reliability margin for demanding environments.

Alternative Active Sources: SN74HC21DR provides active availability with identical electrical performance but operates within a narrower temperature range (-40°C ~ 85°C). This part is suitable for applications not requiring the full -40°C to 125°C range and is available in Cut Tape & Digi-Reel packaging.

Discontinued Parts: CD74HC21M, CD74HC21MT, SN74HC21D, SN74HC21DT, and SN74HC21NSR are discontinued at DiGi Electronics. These parts should be used only when existing inventory is available and no active alternatives meet design requirements. SN74HC21NSR features a wider package body (0.209" vs. 0.154"), which may affect PCB layout compatibility.

All substitute parts maintain RoHS3 compliance and MSL Level 1 rating, ensuring environmental and moisture sensitivity consistency with the original component.

Frequently Asked Questions (FAQ)

Q: Can SN74HC21DR replace 74HC21D,652 in all applications?

A: SN74HC21DR is electrically equivalent but operates within -40°C to 85°C. It is suitable only for applications not requiring operation above 85°C or below -40°C. If your design requires the full -40°C to 125°C range, use SN74HC21QDRQ1 or CD74HC21M96 instead.

Q: What is the difference between CD74HC21M96 and CD74HC21M?

A: Both parts are electrically identical with -55°C to 125°C operating range. CD74HC21M96 is supplied in Tape & Reel packaging and is active. CD74HC21M is supplied in Tube packaging and is discontinued at DiGi Electronics. CD74HC21M96 is the preferred choice for new designs.

Q: Is SN74HC21NSR compatible with the original 74HC21D,652?

A: SN74HC21NSR is electrically compatible but features a different package body width (0.209" vs. 0.154"). This wider package may not fit existing PCB layouts designed for the original 0.154" width. Verify PCB footprint compatibility before substitution.

Q: Why is the 74HC21D,652 marked as obsolete?

A: The original Nexperia part is obsolete, but the 74HC21 logic function remains in active production by Texas Instruments under equivalent part numbers. Multiple active alternatives ensure continued design support and component availability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and MSL Level 1 rating, matching the environmental and moisture sensitivity specifications of the original 74HC21D,652.

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

A: SN74HC21QDRQ1 and CD74HC21M96 are both active products with the highest inventory levels (4914 and 9067 units respectively). Both are suitable for long-term production use. SN74HC21QDRQ1 is recommended for standard temperature range applications, while CD74HC21M96 is preferred for extended temperature requirements.

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