MM74HCT373WM Equivalent & Substitute Parts

Part Overview

The MM74HCT373WM is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring 1 channel with 8:8 circuit configuration and tri-state output capability in a 20-SOIC package. This component operates within the 4.5V to 5.5V supply voltage range and is classified as obsolete. Due to its obsolete status, identifying functionally equivalent substitute parts is essential for design continuity, system maintenance, and procurement flexibility. Substitute parts must maintain electrical compatibility across supply voltage, logic type, circuit configuration, and output characteristics while accommodating variations in propagation delay, output current ratings, and operating temperature ranges.

Key Parameters

Parameter	Value
Manufacturer Part Number	MM74HCT373WM
Manufacturer	onsemi
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage - Supply	4.5V ~ 5.5V
Independent Circuits	1
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the MM74HCT373WM are classified based on strict adherence to core electrical and mechanical parameters. All substitute candidates maintain the following mandatory compatibility criteria:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Supply Voltage Range: 4.5V ~ 5.5V
Independent Circuits: 1
Package / Case: 20-SOIC or 20-SO (0.295" or 0.209" width variants)
Mounting Type: Surface Mount
Base Product Number: 74HCT373

Substitutes are grouped by product status (Active, Discontinued, Obsolete) and compliance certifications (RoHS3, REACH). Variations in propagation delay (14ns to 35ns), output current ratings (6mA to 7.2mA), operating temperature ranges (-40°C to -55°C minimum; 85°C to 125°C maximum), and moisture sensitivity levels are permissible within the scope of functional equivalence, provided the substitute part meets or exceeds the electrical performance requirements of the application.

Parameter Comparison

Part Number	Manufacturer	Product Status	Logic Type	Circuit	Output Type	Supply Voltage	Propagation Delay	Output Current (High/Low)	Operating Temperature	Package	RoHS Status
MM74HCT373WM	onsemi	Obsolete	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	25ns	7.2mA / 7.2mA	-40°C ~ 85°C	20-SOIC	ROHS3 Compliant
MC74HCT373ADWG	onsemi	Active	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	28ns	6mA / 6mA	-55°C ~ 125°C	20-SOIC	ROHS3 Compliant
MC74HCT373ADWR2G	onsemi	Active	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	28ns	6mA / 6mA	-55°C ~ 125°C	20-SOIC	ROHS3 Compliant
CD74HCT373M	Harris Corporation	Obsolete	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	35ns	6mA / 6mA	-55°C ~ 125°C	20-SOIC	RoHS non-compliant
SN74HCT373DW	Texas Instruments	Discontinued at DiGi Electronics	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	25ns	6mA / 6mA	-40°C ~ 85°C	20-SOIC	ROHS3 Compliant
74HCT373D,653	Nexperia USA Inc.	Active	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	14ns	6mA / 6mA	-40°C ~ 125°C	20-SO	ROHS3 Compliant
CD74HCT373M96	Texas Instruments	Active	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	35ns	6mA / 6mA	-55°C ~ 125°C	20-SOIC	ROHS3 Compliant
CD74HCT373MG4	Texas Instruments	Discontinued at DiGi Electronics	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	35ns	6mA / 6mA	-55°C ~ 125°C	20-SOIC	ROHS3 Compliant
SN74HCT373DWR	Texas Instruments	Active	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	25ns	6mA / 6mA	-40°C ~ 85°C	20-SOIC	ROHS3 Compliant
SN74HCT373NSR	Texas Instruments	Active	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	25ns	6mA / 6mA	-40°C ~ 85°C	20-SO	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring direct replacement of the MM74HCT373WM, the following selection criteria apply:

Primary Substitutes (Active Product Status, ROHS3 Compliant):

MC74HCT373ADWG and MC74HCT373ADWR2G (onsemi) provide extended operating temperature range (-55°C to 125°C) with marginally increased propagation delay (28ns). Both maintain ROHS3 compliance and are currently in active production.
SN74HCT373DWR and SN74HCT373NSR (Texas Instruments) match the original propagation delay specification (25ns) and operating temperature range (-40°C to 85°C) with ROHS3 compliance and active availability.
74HCT373D,653 (Nexperia USA Inc.) offers superior propagation delay performance (14ns) with extended operating temperature range (-40°C to 125°C) and ROHS3 compliance in active production status.

Secondary Substitutes (Active or Discontinued Status, ROHS3 Compliant):

CD74HCT373M96 (Texas Instruments) is active with ROHS3 compliance but exhibits slower propagation delay (35ns) and extended operating temperature range (-55°C to 125°C).

Non-Recommended Substitutes:

CD74HCT373M (Harris Corporation) is obsolete and RoHS non-compliant, unsuitable for new designs or compliance-driven applications.

Selection should prioritize active product status and ROHS3 compliance for long-term supply chain stability and regulatory adherence.

Frequently Asked Questions (FAQ)

Q: Can the MM74HCT373WM be directly replaced with any of the listed substitutes? A: Yes, all listed substitutes maintain the core electrical parameters: D-Type Transparent Latch logic type, 8:8 circuit configuration, tri-state output, and 4.5V to 5.5V supply voltage operation. Physical package compatibility (20-SOIC or 20-SO) must be verified for PCB layout considerations.

Q: What is the significance of propagation delay variations among substitutes? A: Propagation delay ranges from 14ns to 35ns across substitute parts. The original MM74HCT373WM specifies 25ns. Substitutes with equal or lower propagation delay (14ns, 25ns) are directly compatible. Substitutes with higher propagation delay (28ns, 35ns) may require timing analysis in applications with strict timing constraints.

Q: Are there package differences between substitutes? A: Yes. Most substitutes use the 20-SOIC package (0.295" width), matching the original. However, 74HCT373D,653 and SN74HCT373NSR use the 20-SO package (0.209" width). While functionally equivalent, the 20-SO variant has a narrower physical footprint and requires PCB layout verification before substitution.

Q: Which substitutes offer the widest operating temperature range? A: MC74HCT373ADWG, MC74HCT373ADWR2G, CD74HCT373M96, and CD74HCT373MG4 all support -55°C to 125°C operating temperature, compared to the original -40°C to 85°C range. The 74HCT373D,653 supports -40°C to 125°C.

Q: What is the difference between active and discontinued product status? A: Active products are in current production with guaranteed long-term availability. Discontinued products may have limited stock and no future manufacturing. For new designs or long-term applications, active substitutes (MC74HCT373ADWG, MC74HCT373ADWR2G, SN74HCT373DWR, SN74HCT373NSR, 74HCT373D,653, CD74HCT373M96) are recommended.

Q: Why is RoHS compliance important for substitute selection? A: ROHS3 compliance indicates the part meets European Union Restriction of Hazardous Substances regulations. All recommended substitutes are ROHS3 compliant. The CD74HCT373M is RoHS non-compliant and unsuitable for applications requiring regulatory compliance.

Q: Can output current differences affect circuit performance? A: The original MM74HCT373WM specifies 7.2mA output current (high and low). Most substitutes specify 6mA. This 1.2mA reduction is within typical logic circuit operating margins but should be verified if the application drives heavy loads or operates near current limits.

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