MM74HC373WMX Equivalent & Substitute Parts

Part Overview

The MM74HC373WMX is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring 1 channel with 8:8 circuit configuration and tri-state output capability. This 20-SOIC surface mount device operates across a 2V to 6V supply voltage range with 19ns propagation delay and is actively stocked with 1561 units available. The part is ROHS3 compliant and classified as Active product status.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications allow for compatible alternatives with enhanced performance characteristics or extended operating temperature ranges.

Key Parameters

Parameter	Value
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage Supply Range	2V ~ 6V
Independent Circuits	1
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Operating Temperature Range	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HC373WMX is determined by the following critical parameters:

Logic Type and Circuit Configuration (D-Type Transparent Latch, 8:8)
Output Type (Tri-State)
Supply Voltage Range (minimum 2V ~ 6V compatibility)
Package Type (20-SOIC form factor)
Mounting Type (Surface Mount)

Parts are grouped into three categories based on substitution relationship:

Similar Parts maintain identical electrical and mechanical specifications with variations in packaging format (Tube, Cut Tape & Digi-Reel) or minor propagation delay differences within acceptable ranges.

Direct Substitutes are functionally equivalent parts from different manufacturers with identical or superior electrical performance characteristics.

Upgrade Parts offer enhanced specifications such as faster propagation delays, extended temperature ranges, or improved compliance status while maintaining core functional compatibility.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Circuit	Output Type	Voltage Supply	Propagation Delay	Operating Temp	Package	Product Status	RoHS Status
MM74HC373WMX	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	19ns	-40°C ~ 85°C	20-SOIC	Active	ROHS3
MC74HC373ADWG	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	21ns	-55°C ~ 125°C	20-SOIC	Active	ROHS3
MC74HC373ADWR2G	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	21ns	-55°C ~ 125°C	20-SOIC	Active	ROHS3
MM74HC373WM	Fairchild Semiconductor	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	19ns	-40°C ~ 85°C	20-SOIC	Active	Not specified
SN74HC373DW	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	15ns	-40°C ~ 85°C	20-SOIC	Discontinued at DiGi Electronics	ROHS3
SN74HC373DWR	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	15ns	-40°C ~ 85°C	20-SOIC	Active	ROHS3
74HC373D,653	Nexperia USA Inc.	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	12ns	-40°C ~ 125°C	20-SOIC	Active	ROHS3
CD74HC373M96	Harris Corporation	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	30ns	-55°C ~ 125°C	20-SOIC	Obsolete	RoHS non-compliant
SN74HC373NSR	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	15ns	-40°C ~ 85°C	20-SOIC	Active	ROHS3

Engineering Selection Recommendations

Preferred Direct Substitutes:

SN74HC373DWR (Texas Instruments) and SN74HC373NSR (Texas Instruments) are recommended as primary alternatives. Both parts maintain Active product status, ROHS3 compliance, and offer superior 15ns propagation delay compared to the MM74HC373WMX baseline of 19ns. SN74HC373DWR is available in Cut Tape & Digi-Reel packaging, while SN74HC373NSR is supplied in Tape & Reel format with significantly higher inventory (25200 units).

Extended Temperature Range Alternative:

MC74HC373ADWG and MC74HC373ADWR2G (both onsemi) provide extended operating temperature range of -55°C to 125°C while maintaining ROHS3 compliance and Active status. These parts are suitable for applications requiring broader thermal operating conditions. MC74HC373ADWR2G offers Tape & Reel packaging with 3300 units in stock.

Performance Upgrade Option:

74HC373D,653 (Nexperia USA Inc.) delivers the fastest propagation delay at 12ns with extended temperature range (-40°C to 125°C) and ROHS3 compliance. This part is recommended when design specifications allow for performance enhancement.

Parts to Avoid:

CD74HC373M96 (Harris Corporation) carries Obsolete product status and RoHS non-compliance. This part should not be selected for new designs or production applications.

SN74HC373DW (Texas Instruments) is marked as Discontinued at DiGi Electronics and should be avoided despite ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can I use MC74HC373ADWG as a direct replacement for MM74HC373WMX?

A: Yes. Both parts share identical logic type (D-Type Transparent Latch), circuit configuration (8:8), output type (tri-state), supply voltage range (2V ~ 6V), and 20-SOIC package. MC74HC373ADWG offers extended operating temperature range (-55°C to 125°C versus -40°C to 85°C) and maintains ROHS3 compliance. The 21ns propagation delay is marginally higher than the 19ns specification of MM74HC373WMX.

Q: What is the difference between SN74HC373DWR and SN74HC373NSR?

A: Both Texas Instruments parts provide identical electrical specifications with 15ns propagation delay and -40°C to 85°C operating range. The primary difference is packaging format: SN74HC373DWR is supplied in Cut Tape & Digi-Reel format (2800 units available), while SN74HC373NSR is supplied in Tape & Reel format (25200 units available). Package dimensions differ slightly: SN74HC373DWR uses 0.295" width while SN74HC373NSR uses 0.209" width.

Q: Why should I avoid CD74HC373M96?

A: CD74HC373M96 is classified as Obsolete and does not meet ROHS3 compliance requirements. New designs and production applications should not incorporate obsolete components due to supply chain uncertainty and regulatory non-compliance.

Q: Is 74HC373D,653 compatible with my existing PCB layout designed for MM74HC373WMX?

A: Yes. Both parts use 20-SOIC package format with identical pin configuration and electrical characteristics. The 74HC373D,653 offers superior performance with 12ns propagation delay and extended temperature range (-40°C to 125°C). No PCB layout modifications are required.

Q: What packaging options are available for 74HC373 logic latches?

A: Available packaging formats include Cut Tape & Digi-Reel (MM74HC373WMX, SN74HC373DWR, 74HC373D,653), Tube (MC74HC373ADWG, SN74HC373DW, CD74HC373M), Tape & Reel (MC74HC373ADWR2G, SN74HC373NSR), and Bulk (CD74HC373M96). Selection depends on manufacturing process requirements and order quantities.

Q: Can I use parts with different propagation delays interchangeably?

A: Propagation delay differences (ranging from 12ns to 30ns across available substitutes) may affect circuit timing characteristics. Parts with faster propagation delays (12ns to 15ns) are generally compatible with designs specified for slower parts (19ns to 30ns). Verification of timing requirements in your specific application is necessary before substitution.

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