SN74LVC373APWRG4 Equivalent & Substitute Parts

Part Overview

The SN74LVC373APWRG4 is a D-Type Transparent Latch logic IC manufactured by Texas Instruments, featuring an 8:8 circuit configuration with tri-state output capability in a 20-TSSOP surface mount package. This part is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain functional and electrical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Supply Voltage Range	1.65V ~ 3.6V
Propagation Delay	1.5ns
Output Current (High/Low)	24mA / 24mA
Operating Temperature	-40°C ~ 85°C
Package Type	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Independent Circuits	1

Substitute Part Grouping Explanation

Substitution of the SN74LVC373APWRG4 is determined by strict equivalence across the following critical parameters:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Package/Case: 20-TSSOP (0.173", 4.40mm Width)
Mounting Type: Surface Mount
Supply Voltage Range: Minimum 1.65V ~ 3.6V (substitute must support this range or higher minimum)
Propagation Delay: 1.5ns (substitute must meet or exceed this specification)
Output Current: 24mA minimum for both high and low states

Substitute parts are grouped into two categories:

Parametric Equivalents (Full Specification Match): Parts that match all critical electrical and mechanical parameters with identical or superior performance characteristics.

Manufacturer Recommended Alternatives: Parts from alternative manufacturers that maintain functional compatibility within the specified parameter envelope, though may originate from different product series (74LVC vs. 74LCX).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Supply Voltage	Propagation Delay	Output Current (mA)	Operating Temp (°C)	Package	Product Status
SN74LVC373APWRG4	Texas Instruments	74LVC	1.65V ~ 3.6V	1.5ns	24 / 24	-40 ~ 85	20-TSSOP	Discontinued
SN74LVC373APWR	Texas Instruments	74LVC	1.65V ~ 3.6V	1.5ns	24 / 24	-40 ~ 85	20-TSSOP	Active
SN74LVC373APWT	Texas Instruments	74LVC	1.65V ~ 3.6V	1.5ns	24 / 24	-40 ~ 85	20-TSSOP	Active
74LVC373APW,118	NXP Semiconductors	74LVC	Not specified	Not specified	Not specified	Not specified	Not specified	Active
74LVC373AT20-13	Diodes Incorporated	74LVC	1.65V ~ 3.6V	4.4ns	24 / 24	-40 ~ 125	20-TSSOP	Active
MC74LCX373DTG	onsemi	74LCX	2V ~ 3.6V	1.5ns	24 / 24	-40 ~ 85	20-TSSOP	Active
MC74LCX373DTR2G	onsemi	74LCX	2V ~ 3.6V	1.5ns	24 / 24	-40 ~ 85	20-TSSOP	Active
74LCX373MTC	Fairchild Semiconductor	74LCX	2V ~ 3.6V	1.5ns	24 / 24	-40 ~ 85	20-TSSOP	Active
74LCX373FT	Toshiba Semiconductor and Storage	TC74LCX	1.65V ~ 3.6V	1.5ns	24 / 24	-40 ~ 85	20-TSSOP	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

SN74LVC373APWR and SN74LVC373APWT from Texas Instruments are direct parametric equivalents with identical electrical specifications and active product status. These represent the most straightforward replacement path for the discontinued SN74LVC373APWRG4, requiring no design modifications.

Secondary Substitutes (Series Variants):

MC74LCX373DTG, MC74LCX373DTR2G, 74LCX373MTC, and 74LCX373FT maintain functional compatibility with matching propagation delay (1.5ns) and output current specifications. These parts operate within a minimum supply voltage of 2V (versus 1.65V for the original), which is acceptable for most applications operating at standard logic levels. All maintain the 20-TSSOP package requirement and active product status.

Extended Temperature Range Option:

74LVC373AT20-13 from Diodes Incorporated extends the operating temperature range to -40°C ~ 125°C, providing enhanced thermal performance. Propagation delay increases to 4.4ns, which remains within acceptable timing margins for most latch applications. This part is suitable for applications requiring extended temperature operation.

Compliance Considerations:

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status where specified. Moisture sensitivity levels are consistent (MSL 1 or MSL 3) across all active alternatives, supporting standard PCB assembly and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SN74LVC373APWRG4 with SN74LVC373APWR?

A: Yes. Both parts are Texas Instruments 74LVC series components with identical electrical specifications, package type, and pin configuration. The only difference is packaging format (Cut Tape vs. Tape & Reel), which does not affect functional compatibility.

Q: What is the difference between 74LVC and 74LCX series substitutes?

A: The 74LVC series supports a supply voltage range of 1.65V ~ 3.6V, while 74LCX series supports 2V ~ 3.6V. Both maintain identical propagation delay (1.5ns) and output current specifications. The 74LCX minimum voltage constraint is acceptable for standard logic applications operating at 3.3V or 5V levels.

Q: Why does 74LVC373AT20-13 have a longer propagation delay (4.4ns vs. 1.5ns)?

A: This is a specification difference from Diodes Incorporated. The extended propagation delay remains within acceptable timing margins for transparent latch applications. This part offers the advantage of extended operating temperature range (-40°C ~ 125°C) for thermal-demanding environments.

Q: Are all substitute parts available in the same 20-TSSOP package?

A: Yes. All listed substitute parts are specified for the 20-TSSOP (0.173", 4.40mm Width) surface mount package, ensuring mechanical and electrical compatibility with existing PCB layouts.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in multiple packaging formats: Tape & Reel (TR) for automated assembly, Cut Tape (CT) for manual assembly, Tube for smaller quantities, and Bulk for large-volume procurement. Packaging format does not affect electrical performance.

Q: Is the NXP 74LVC373APW,118 a suitable substitute?

A: The NXP part is listed as an active alternative; however, complete electrical specifications are not provided in the available data. Verification of supply voltage range, propagation delay, and output current specifications against your application requirements is necessary before selection.

Q: Can I use these substitutes in new designs, or only for replacement?

A: All listed active substitutes are suitable for both new designs and replacement applications. Texas Instruments SN74LVC373APWR and SN74LVC373APWT are recommended for new designs due to full specification transparency and established supply chain availability.

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