CD74HC21M Equivalent & Substitute Parts

Part Overview

The CD74HC21M is a 2-channel AND gate logic IC manufactured by Texas Instruments in a 14-SOIC surface mount package. This device implements dual 4-input AND gate functions and operates across a 2V to 6V supply voltage range. The CD74HC21M is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement. Substitute parts must maintain identical logic functionality, electrical performance, and mechanical compatibility within the 74HC21 series.

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	-55°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

Substitute parts for the CD74HC21M are qualified based on the following criteria:

Core Electrical Parameters (Must Match):

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
Base Product Number: 74HC21

Mechanical Parameters (Must Match):

Mounting Type: Surface Mount
Package / Case: 14-SOIC (0.154", 3.90mm Width)

Compliance Parameters (Must Match):

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitutes may differ in packaging format (Tube vs. Tape & Reel), supplier device package designation (14-SOIC vs. 14-SO), manufacturer identity, and operating temperature range, provided all electrical and mechanical parameters remain equivalent.

Parameter Comparison

Parameter	CD74HC21M (Main)	CD74HC21M96 (Substitute)	74HC21D,653 (Substitute)
Manufacturer	Texas Instruments	Texas Instruments	Nexperia USA Inc.
Logic Type	AND Gate	AND Gate	AND Gate
Number of Circuits	2	2	2
Number of Inputs	4	4	4
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V
Current - Quiescent (Max)	2 µA	2 µA	2 µA
Current - Output High, Low	5.2mA, 5.2mA	5.2mA, 5.2mA	5.2mA, 5.2mA
Input Logic Level - Low	0.5V ~ 1.8V	0.5V ~ 1.8V	0.5V ~ 1.8V
Input Logic Level - High	1.5V ~ 4.2V	1.5V ~ 4.2V	1.5V ~ 4.2V
Max Propagation Delay @ 6V, 50pF	19ns	19ns	19ns
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)
Packaging Format	Tube	Tape & Reel (TR)	Tape & Reel (TR)
Product Status	Discontinued at DiGi Electronics	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

CD74HC21M96 (Texas Instruments, Tape & Reel)

This substitute maintains identical electrical specifications and operating temperature range (-55°C ~ 125°C) as the main part. The primary difference is packaging format: Tape & Reel instead of Tube. Both are ROHS3 compliant with MSL 1 rating. Product status is Active, ensuring continued availability. This substitute is recommended for applications requiring the full temperature range and Texas Instruments sourcing continuity.

74HC21D,653 (Nexperia USA Inc., Tape & Reel)

This substitute meets all core electrical parameters and maintains ROHS3 compliance with MSL 1 rating. The operating temperature range is -40°C ~ 125°C, which is narrower than the main part by 15°C at the lower end. Product status is Active. This substitute is suitable for applications operating within the -40°C ~ 125°C range and where Nexperia sourcing is acceptable. The Tape & Reel packaging format differs from the original Tube format.

Frequently Asked Questions (FAQ)

Q: Can CD74HC21M96 be used as a direct replacement for CD74HC21M?

A: Yes. Both parts are manufactured by Texas Instruments and share identical electrical specifications, operating temperature range, and package dimensions. The difference is packaging format: CD74HC21M96 is supplied in Tape & Reel format while CD74HC21M is supplied in Tube format. Electrical and mechanical compatibility is complete.

Q: What is the difference between 14-SOIC and 14-SO package designations?

A: Both designations refer to the same physical package: 14-pin Small Outline Integrated Circuit with 0.154" (3.90mm) width. The designations are manufacturer-specific nomenclature but represent identical mechanical and electrical interfaces.

Q: Is 74HC21D,653 compatible with applications requiring -55°C operation?

A: No. The 74HC21D,653 operating temperature range is -40°C ~ 125°C. Applications requiring operation at -55°C must use CD74HC21M or CD74HC21M96, both rated to -55°C ~ 125°C.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. CD74HC21M96 and 74HC21D,653 are both ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the compliance profile of the main part.

Q: What is the impact of Tape & Reel packaging on circuit board assembly?

A: Tape & Reel packaging is standard for automated pick-and-place assembly equipment. It provides no functional or electrical difference compared to Tube packaging. The choice between formats depends on assembly process requirements and volume considerations.

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

A: Yes, within the specified operating temperature ranges. All three parts implement identical 2-channel 4-input AND gate logic with matching electrical performance, propagation delay, and power consumption characteristics. Pin configuration and package footprint are identical.

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