SN74LVC373APWTE4 Equivalent & Substitute Parts

Part Overview

The SN74LVC373APWTE4 is a D-Type Transparent Latch IC manufactured by Texas Instruments, featuring an 8:8 channel configuration with tri-state output in a 20-TSSOP surface mount package. This part is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. The 74LVC373 logic family provides low-voltage transparent latch functionality suitable for bus driving and data storage applications in digital systems operating between 1.65V and 3.6V supply voltage.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74LVC373APWTE4
Manufacturer	Texas Instruments
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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74LVC373APWTE4 is determined by strict equivalence across the following critical parameters:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8 channel
Output Type: Tri-State
Package/Case: 20-TSSOP (0.173", 4.40mm Width)
Mounting Type: Surface Mount
Supply Voltage Range: Minimum 1.65V support required
Output Current Capability: 24mA minimum (both high and low)
Propagation Delay: 1.5ns nominal
Operating Temperature Range: -40°C minimum to 85°C minimum

Substitute parts are grouped into two categories: Texas Instruments 74LVC series variants (packaging differences only) and cross-manufacturer equivalents from Fairchild Semiconductor, NXP Semiconductors, Diodes Incorporated, onsemi, and Toshiba Semiconductor. All substitutes maintain identical functional specifications and package footprint compatibility.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Circuit	Output Type	Supply Voltage	Propagation Delay	Output Current (H/L)	Operating Temp	Package	Product Status
SN74LVC373APWTE4	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	1.65V ~ 3.6V	1.5ns	24mA / 24mA	-40°C ~ 85°C	20-TSSOP	Discontinued
SN74LVC373APWR	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	1.65V ~ 3.6V	1.5ns	24mA / 24mA	-40°C ~ 85°C	20-TSSOP	Active
SN74LVC373APWRG4	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	1.65V ~ 3.6V	1.5ns	24mA / 24mA	-40°C ~ 85°C	20-TSSOP	Discontinued
SN74LVC373APWT	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	1.65V ~ 3.6V	1.5ns	24mA / 24mA	-40°C ~ 85°C	20-TSSOP	Active
74LCX373MTC	Fairchild Semiconductor	D-Type Transparent Latch	8:8	Tri-State	2V ~ 3.6V	1.5ns	24mA / 24mA	-40°C ~ 85°C	20-TSSOP	Active
74LVC373APW,118	NXP Semiconductors	D-Type Transparent Latch	8:8	Tri-State	1.65V ~ 3.6V	—	24mA / 24mA	—	20-TSSOP	Active
74LVC373AT20-13	Diodes Incorporated	D-Type Transparent Latch	8:8	Tri-State	1.65V ~ 3.6V	4.4ns	24mA / 24mA	-40°C ~ 125°C	20-TSSOP	Active
MC74LCX373DTG	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 3.6V	1.5ns	24mA / 24mA	-40°C ~ 85°C	20-TSSOP	Active
MC74LCX373DTR2G	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 3.6V	1.5ns	24mA / 24mA	-40°C ~ 85°C	20-TSSOP	Active
74LCX373FT	Toshiba Semiconductor and Storage	D-Type Transparent Latch	8:8	Tri-State	1.65V ~ 3.6V	1.5ns	24mA / 24mA	-40°C ~ 85°C	20-TSSOP	Active

Engineering Selection Recommendations

For direct replacement of the discontinued SN74LVC373APWTE4, the SN74LVC373APWR (Texas Instruments, Active status) is the primary equivalent, offering identical electrical specifications and packaging with current manufacturing availability.

The SN74LVC373APWT (Texas Instruments, Active status) provides an alternative within the same manufacturer family with equivalent performance characteristics.

Cross-manufacturer substitutes maintain functional compatibility with the following considerations:

74LVC373AT20-13 (Diodes Incorporated) extends the operating temperature range to -40°C ~ 125°C and increases propagation delay to 4.4ns, with higher moisture sensitivity level (MSL 3). This part remains functionally compatible for applications within the original -40°C ~ 85°C specification.

74LCX373MTC (Fairchild Semiconductor), MC74LCX373DTG, and MC74LCX373DTR2G (onsemi) operate with a minimum supply voltage of 2V instead of 1.65V. These parts are suitable for applications where the supply voltage remains at or above 2V.

74LCX373FT (Toshiba Semiconductor) maintains full compatibility with the original supply voltage range of 1.65V ~ 3.6V and all other electrical parameters.

All substitute parts are ROHS3 compliant and maintain the 20-TSSOP package footprint for direct PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use 74LVC373AT20-13 as a direct replacement for SN74LVC373APWTE4?

A: Yes. The 74LVC373AT20-13 maintains identical logic type, circuit configuration, output type, and package. The propagation delay increases from 1.5ns to 4.4ns and operating temperature extends to 125°C. For applications operating within the original -40°C ~ 85°C range, this substitution is functionally equivalent.

Q: What is the difference between 74LCX373 and 74LVC373 series parts?

A: Both series provide D-Type Transparent Latch functionality in 8:8 configuration with tri-state output. The primary difference is minimum supply voltage: 74LVC373 supports 1.65V minimum, while 74LCX373 requires 2V minimum. Select 74LVC373 variants for applications requiring operation below 2V supply voltage.

Q: Are all substitute parts in the same package?

A: Yes. All listed substitutes use the 20-TSSOP (0.173", 4.40mm Width) surface mount package, ensuring identical PCB footprint and mounting compatibility.

Q: Which substitute has the best availability?

A: 74LVC373AT20-13 (Diodes Incorporated) shows the highest inventory at 15,400 pieces. SN74LVC373APWR (Texas Instruments) provides 2,427 pieces with Active product status.

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

A: Propagation delay differences (1.5ns vs. 4.4ns) affect timing performance. Verify that your application timing margins accommodate the slower delay specification before substituting 74LVC373AT20-13 in timing-critical circuits.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 indicates the component can be stored indefinitely without moisture bake-out requirements. Parts with MSL 3 (such as 74LVC373AT20-13) require moisture bake-out after 168 hours of exposure to ambient humidity before soldering.

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