74LVT573WM D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74LVT573WM is a D-Type Transparent Latch IC manufactured by onsemi, featuring 1 channel with 8:8 circuit configuration and tri-state output capability. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 74LVT573 series provides a standardized logic interface suitable for data latching applications requiring low-voltage operation between 2.7V and 3.6V.

Key Parameters

Parameter	Value
Manufacturer Part Number	74LVT573WM
Manufacturer	onsemi
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage Supply Range	2.7V ~ 3.6V
Independent Circuits	1
Delay Time - Propagation	4.4ns
Current Output High/Low	32mA / 64mA
Operating Temperature Range	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74LVT573WM is determined by strict equivalence across the following critical parameters:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Voltage Supply Range: 2.7V ~ 3.6V
Independent Circuits: 1
Operating Temperature Range: -40°C ~ 85°C
Package / Case: 20-SOIC form factor
Mounting Type: Surface Mount

All identified substitute parts maintain these core electrical and mechanical specifications. Variations in propagation delay time (2.7ns to 4.4ns) and packaging options (20-SOIC vs. 20-SO) remain within acceptable substitution parameters for this component category. Product status transitions from obsolete to active availability represent the primary advantage of these alternatives.

Parameter Comparison

Parameter	74LVT573WM (onsemi)	74LVT573D,118 (NXP)	SN74LVT573DW (TI)	SN74LVTH573DW (TI)	SN74LVTH573DWR (TI)	SN74LVTH573NSR (TI)
Logic Type	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch
Circuit Configuration	8:8	8:8	8:8	8:8	8:8	8:8
Output Type	Tri-State	Tri-State	Tri-State	Tri-State	Tri-State	Tri-State
Voltage Supply Range	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V
Independent Circuits	1	1	1	1	1	1
Delay Time - Propagation	4.4ns	2.7ns	2.9ns	2.9ns	2.9ns	2.9ns
Current Output High/Low	32mA / 64mA	32mA / 64mA	32mA / 64mA	32mA / 64mA	32mA / 64mA	32mA / 64mA
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.209", 5.30mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	Not specified	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All substitute parts listed maintain full electrical and functional equivalence to the 74LVT573WM. Selection among active alternatives should prioritize the following factors:

Product Availability & Status: All substitute parts carry active product status, ensuring long-term procurement viability compared to the obsolete 74LVT573WM.

Compliance & Certifications: Texas Instruments variants (SN74LVT573DW, SN74LVTH573DW, SN74LVTH573DWR, SN74LVTH573NSR) provide ROHS3 compliance certification. The NXP 74LVT573D,118 does not specify RoHS status in provided documentation.

Propagation Delay Performance: The 74LVT573D,118 (NXP) offers the fastest propagation delay at 2.7ns, while Texas Instruments variants provide 2.9ns. Both represent performance improvements over the original 4.4ns specification.

Package Considerations: SN74LVTH573NSR features a narrower 20-SO package (0.209", 5.30mm width) compared to standard 20-SOIC (0.295", 7.50mm width) variants. This dimension difference requires PCB layout verification before substitution.

Packaging Format: Selection between tube, tape & reel, and bulk packaging depends on procurement volume and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can the 74LVT573D,118 from NXP directly replace the 74LVT573WM?

A: Yes. The 74LVT573D,118 maintains identical electrical specifications including voltage supply range (2.7V ~ 3.6V), circuit configuration (8:8), output type (tri-state), and operating temperature range (-40°C ~ 85°C). The 20-SOIC package footprint is identical. The faster propagation delay (2.7ns vs. 4.4ns) represents an improvement with no compatibility concerns.

Q: What is the difference between 74LVT573 and 74LVTH573 series?

A: Both series maintain identical core electrical specifications for this application. The 74LVTH573 variants from Texas Instruments provide ROHS3 compliance certification and active product status. Functional performance and pin compatibility remain equivalent.

Q: Does the SN74LVTH573NSR package dimension difference affect PCB compatibility?

A: The SN74LVTH573NSR uses a narrower 20-SO package (0.209", 5.30mm width) compared to standard 20-SOIC packages (0.295", 7.50mm width). PCB footprint and land pattern verification is required before substitution. Other variants maintain the standard 20-SOIC footprint.

Q: Are all substitute parts rated for the same operating temperature range?

A: Yes. All substitute parts operate across the identical temperature range of -40°C to 85°C, matching the original 74LVT573WM specification.

Q: Which substitute part offers the best long-term availability?

A: All substitute parts carry active product status. Texas Instruments variants provide additional ROHS3 compliance certification, supporting extended design lifecycle requirements.

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