CD74HCT373M Equivalent & Substitute Parts

Part Overview

The CD74HCT373M is a D-Type Transparent Latch logic IC manufactured by Texas Instruments, featuring an 8:8 circuit configuration with tri-state output capability. This component operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC surface mount package. The part is currently in Last Time Buy status, indicating limited availability from the original manufacturer. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term production requirements.

Key Parameters

Parameter	Value
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage Supply Range	4.5V ~ 5.5V
Independent Circuits	1
Propagation Delay	35ns
Output Current (High/Low)	6mA / 6mA
Operating Temperature Range	-55°C ~ 125°C
Package Type	20-SOIC (0.295", 7.50mm Width)
RoHS Compliance	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the CD74HCT373M are classified based on the following critical parameters that determine functional and mechanical compatibility:

Primary Substitution Criteria:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Voltage Supply Range: 4.5V ~ 5.5V
Package Type: 20-SOIC form factor
Mounting Type: Surface Mount

Substitution Categories:

Category 1: Direct Functional Equivalents (Identical Logic Type and Circuit) Parts maintaining the same D-Type Transparent Latch 8:8 configuration with tri-state output in 20-SOIC packaging. These parts satisfy all primary substitution criteria and differ only in propagation delay, output current specifications, or packaging format (Tube vs. Tape & Reel).

Category 2: Parametric Equivalents (Same Base Function, Different Specifications) Parts with the same logic type and circuit configuration but with variations in propagation delay or operating temperature range. These remain functionally compatible within the 20-SOIC package constraint.

Category 3: Functional Alternatives (Different Logic Type) Parts with different logic types (such as Multiplexer configurations) that do not meet the primary substitution criteria and are listed for reference only.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Logic Type	Circuit	Output Type	Voltage Supply	Propagation Delay	Output Current (H/L)	Operating Temp	Package	Product Status	RoHS Status	Packaging Format
CD74HCT373M	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	35ns	6mA / 6mA	-55°C ~ 125°C	20-SOIC	Last Time Buy	ROHS3 Compliant	Tube
CD74HCT373M96	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	35ns	6mA / 6mA	-55°C ~ 125°C	20-SOIC	Active	ROHS3 Compliant	Tape & Reel
CD74HCT573M	Harris Corporation	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	35ns	6mA / 6mA	-55°C ~ 125°C	20-SOIC	Obsolete	RoHS Non-Compliant	Tube
74HCT373D,653	Nexperia USA Inc.	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	14ns	6mA / 6mA	-40°C ~ 125°C	20-SOIC	Active	ROHS3 Compliant	Tape & Reel
74HCT373D-Q100,118	NXP USA Inc.	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	14ns	6mA / 6mA	-40°C ~ 125°C	20-SOIC	Active	Not Specified	Bulk
MC74HCT373ADWR2G	onsemi	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	28ns	6mA / 6mA	-55°C ~ 125°C	20-SOIC	Active	ROHS3 Compliant	Tape & Reel
MM74HCT373WMX	Fairchild Semiconductor	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	25ns	7.2mA / 7.2mA	-40°C ~ 85°C	20-SOIC	Active	Not Specified	Bulk
CD74HCT373MG4	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	35ns	6mA / 6mA	-55°C ~ 125°C	20-SOIC	Discontinued at DiGi Electronics	ROHS3 Compliant	Not Specified
MC74HCT373ADWG	onsemi	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	28ns	6mA / 6mA	-55°C ~ 125°C	20-SOIC	Active	ROHS3 Compliant	Tube

Engineering Selection Recommendations

Tier 1: Recommended Direct Substitutes

CD74HCT373M96 (Texas Instruments) is the primary recommended substitute. It maintains identical electrical specifications to the original part, including 35ns propagation delay and 6mA output current. The only difference is packaging format (Tape & Reel vs. Tube), which does not affect functional compatibility. Product status is Active, ensuring continued availability.

MC74HCT373ADWR2G (onsemi) and MC74HCT373ADWG (onsemi) are functionally compatible alternatives with improved propagation delay (28ns vs. 35ns) and identical output current specifications. Both maintain the full -55°C to 125°C operating temperature range and ROHS3 compliance. These parts are in Active status with established supply chains.

Tier 2: Compatible Alternatives with Performance Improvements

74HCT373D,653 (Nexperia USA Inc.) offers superior propagation delay performance (14ns) while maintaining all critical electrical parameters. This part is in Active status and ROHS3 compliant. The operating temperature range is -40°C to 125°C, which is acceptable for most applications but does not extend to -55°C. Tape & Reel packaging is standard for high-volume production.

74HCT373D-Q100,118 (NXP USA Inc.) provides the same performance characteristics as the Nexperia part with automotive-grade qualification (AEC-Q100). This variant is suitable for automotive and mission-critical applications requiring enhanced reliability documentation.

Tier 3: Alternative Sources with Specification Variations

MM74HCT373WMX (Fairchild Semiconductor) provides functional compatibility with improved propagation delay (25ns) but operates within a narrower temperature range (-40°C to 85°C). Output current is slightly elevated (7.2mA vs. 6mA). This part is suitable for commercial-grade applications within the specified temperature limits.

Parts Not Recommended for New Designs

CD74HCT573M (Harris Corporation) is obsolete and RoHS non-compliant, making it unsuitable for new production or long-term supply assurance.

CD74HCT373MG4 (Texas Instruments) is discontinued at DiGi Electronics and should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can I use CD74HCT373M96 as a direct replacement for CD74HCT373M?

A: Yes. CD74HCT373M96 is electrically and mechanically identical to CD74HCT373M. The only difference is packaging format (Tape & Reel vs. Tube). Both parts have identical propagation delay (35ns), output current (6mA), operating temperature range (-55°C to 125°C), and RoHS compliance status. The change in packaging format does not affect circuit performance.

Q: What is the difference between the onsemi MC74HCT373ADWR2G and MC74HCT373ADWG variants?

A: Both onsemi parts are functionally identical with 28ns propagation delay and identical output current specifications. The primary difference is packaging format: MC74HCT373ADWR2G is supplied in Tape & Reel format, while MC74HCT373ADWG is supplied in Tube format. Both maintain -55°C to 125°C operating temperature range and ROHS3 compliance. Selection depends on production volume and assembly equipment compatibility.

Q: Why do some substitute parts have faster propagation delays (14ns vs. 35ns)?

A: Propagation delay variation is a normal characteristic across different manufacturers' implementations of the same logic function. Faster propagation delays (such as 14ns from Nexperia) indicate improved performance but do not affect functional compatibility. The original CD74HCT373M specification of 35ns is conservative and suitable for most timing-non-critical applications. Faster alternatives can be used without circuit modification, provided the application does not depend on the original delay characteristics.

Q: Is the Nexperia 74HCT373D,653 suitable for applications requiring -55°C operation?

A: The Nexperia part operates from -40°C to 125°C, which does not extend to -55°C. If your application requires -55°C operation, select CD74HCT373M96, MC74HCT373ADWR2G, MC74HCT373ADWG, or CD74HCT373MG4 instead. These parts maintain the full -55°C to 125°C temperature range.

Q: What does ROHS3 compliance mean for this component?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All recommended Tier 1 and Tier 2 substitutes are ROHS3 compliant, ensuring compatibility with modern manufacturing standards and environmental regulations.

Q: Can I use MM74HCT373WMX in a -55°C environment?

A: No. The MM74HCT373WMX operates from -40°C to 85°C and is not rated for -55°C operation. This part is suitable only for commercial-grade applications within the specified temperature range. For extended temperature operation, select alternatives with -55°C minimum ratings.

Q: Are there any output current differences I should consider?

A: Most substitute parts maintain 6mA output current (high and low) matching the original CD74HCT373M specification. The exception is MM74HCT373WMX, which provides 7.2mA output current. This higher current capability does not create compatibility issues and may improve drive capability for certain load conditions. Verify your circuit design does not depend on the original 6mA specification before selecting this alternative.

Q: What is the significance of the AEC-Q100 qualification on the 74HCT373D-Q100,118?

A: AEC-Q100 is an automotive industry qualification standard indicating the part has undergone enhanced reliability testing and documentation. This variant is suitable for automotive applications and mission-critical systems requiring formal qualification documentation. For non-automotive applications, the standard 74HCT373D,653 variant is functionally equivalent and more readily available.

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