SN74HC373DW Equivalent & Substitute Parts

Part Overview

The SN74HC373DW is a D-Type Transparent Latch logic IC manufactured by Texas Instruments, featuring an 8:8 circuit configuration with tri-state output in a 20-SOIC surface mount package. This part is currently discontinued at DiGi Electronics, with 4118 pieces available in new original stock. The SN74HC373DW operates across a 2V to 6V supply voltage range and is ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Due to the discontinued status of the SN74HC373DW, equivalent and substitute parts are necessary for ongoing design support, production continuity, and long-term component availability. Substitute options include direct manufacturer alternatives, upgraded variants with enhanced specifications, and parametric equivalents that maintain functional compatibility.

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
Delay Time - Propagation	15ns
Current Output High/Low	7.8mA / 7.8mA
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HC373DW is determined by the following critical parameters: Logic Type (D-Type Transparent Latch), Circuit Configuration (8:8), Output Type (Tri-State), Package Type (20-SOIC), and Voltage Supply Range (2V ~ 6V). All substitute parts maintain these core electrical and mechanical specifications.

Substitute parts are grouped into four categories:

Direct Manufacturer Substitutes maintain identical specifications across all critical parameters, including propagation delay (15ns or compatible), operating temperature range, and packaging. These parts are pin-compatible and functionally interchangeable without design modification.

Upgrade Variants offer enhanced performance characteristics such as faster propagation delay (12ns) or extended operating temperature ranges (-40°C ~ 125°C) while maintaining the same package footprint and core functionality. These parts provide performance improvements with full backward compatibility.

Manufacturer Recommended Alternatives include automotive-grade variants with AEC-Q100 qualification, suitable for applications requiring automotive reliability standards while maintaining electrical and mechanical compatibility.

Parametric Equivalents share the same base product family (74HC series) and functional characteristics but may have different base product numbers (such as 74HC573 versus 74HC373). These parts are functionally equivalent for latch applications but require verification of specific circuit requirements.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Circuit	Output Type	Voltage Supply	Propagation Delay	Operating Temp	Package	Product Status	Inventory
SN74HC373DW	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	15ns	-40°C ~ 85°C	20-SOIC	Discontinued	4118 Pcs
SN74HC373DWR	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	15ns	-40°C ~ 85°C	20-SOIC	Active	2800 Pcs
MC74HC373ADWR2G	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	21ns	-55°C ~ 125°C	20-SOIC	Active	3300 Pcs
MM74HC373WM	Fairchild Semiconductor	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	19ns	-40°C ~ 85°C	20-SOIC	Active	1572 Pcs
MM74HC373WMX	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	19ns	-40°C ~ 85°C	20-SOIC	Active	1561 Pcs
74HC373D,653	Nexperia USA Inc.	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	12ns	-40°C ~ 125°C	20-SOIC	Active	2000 Pcs
74HC373D-Q100,118	Nexperia USA Inc.	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	12ns	-40°C ~ 125°C	20-SOIC	Active	2910 Pcs
MC74HC373ADWG	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	21ns	-55°C ~ 125°C	20-SOIC	Active	2720 Pcs
MM74HC573WM	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	15ns	-40°C ~ 85°C	20-SOIC	Active	1350 Pcs

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): SN74HC373DWR is the primary direct substitute, manufactured by Texas Instruments with active product status. This part maintains identical electrical characteristics and packaging, requiring no design modification. Inventory availability is 2800 pieces.

For Extended Temperature Range Applications: MC74HC373ADWR2G and MC74HC373ADWG, both from onsemi, extend the operating temperature range to -55°C ~ 125°C while maintaining the 2V ~ 6V supply voltage specification. These parts are suitable for applications requiring broader thermal performance. Propagation delay increases to 21ns, which remains within acceptable timing margins for most latch applications.

For Performance Enhancement: 74HC373D,653 and 74HC373D-Q100,118 from Nexperia USA Inc. offer improved propagation delay of 12ns (compared to 15ns in the original) and extended operating temperature to -40°C ~ 125°C. The 74HC373D-Q100,118 variant includes AEC-Q100 automotive qualification, suitable for automotive-grade applications.

For Parametric Equivalence: MM74HC573WM from onsemi provides functional equivalence with matching propagation delay (15ns) and operating temperature range (-40°C ~ 85°C). This part uses the 74HC573 base product number rather than 74HC373, requiring verification of circuit-specific requirements before selection.

All substitute parts maintain ROHS3 compliance and are available in active production status, ensuring long-term supply continuity.

Frequently Asked Questions (FAQ)

Q: Can SN74HC373DWR be used as a direct replacement for SN74HC373DW?

A: Yes. SN74HC373DWR is manufactured by Texas Instruments and maintains identical electrical specifications, including 15ns propagation delay, 2V ~ 6V supply voltage, -40°C ~ 85°C operating temperature, and 20-SOIC packaging. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube). No design modification is required.

Q: What is the difference between the 74HC373 and 74HC573 base product numbers?

A: Both are D-Type Transparent Latch ICs with 8:8 circuit configuration and tri-state output. The MM74HC573WM is a parametric equivalent that shares the same functional characteristics and electrical specifications as the SN74HC373DW. Verification of specific circuit requirements is necessary before substitution.

Q: Are the onsemi MC74HC373ADWR2G and MC74HC373ADWG parts suitable for all applications?

A: These parts are suitable for applications requiring extended operating temperature range (-55°C ~ 125°C). However, propagation delay increases to 21ns compared to 15ns in the original part. Applications with tight timing constraints must verify that this 6ns increase does not impact system performance.

Q: What is the significance of the AEC-Q100 qualification on 74HC373D-Q100,118?

A: AEC-Q100 qualification indicates the part meets automotive reliability standards. This variant is suitable for automotive applications requiring formal qualification documentation. The part maintains identical electrical specifications to other Nexperia variants while providing automotive-grade assurance.

Q: Can I use the Nexperia 74HC373D,653 in place of the discontinued SN74HC373DW?

A: Yes. The 74HC373D,653 is functionally compatible with improved specifications: 12ns propagation delay (faster than the original 15ns) and extended operating temperature range (-40°C ~ 125°C). The faster propagation delay provides performance margin and is backward compatible with designs using the original part.

Q: What packaging formats are available for these substitute parts?

A: Substitute parts are available in multiple packaging formats: Cut Tape & Digi-Reel (CT), Tape & Reel (TR), and Tube. All maintain the same 20-SOIC physical package footprint (0.295", 7.50mm Width) and are compatible with standard surface mount assembly processes. Packaging format selection depends on production volume and handling requirements.

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