SN74LVC540AQDWREP Equivalent & Substitute Parts

Part Overview

The SN74LVC540AQDWREP is an inverting buffer logic integrated circuit manufactured by Texas Instruments, designed for 3.6V operation in 20-SOIC surface mount packaging. This active product functions as a Buffer, Inverting with 1 element and 8 bits per element, featuring 3-state output capability. The device is suitable for applications requiring signal inversion and buffering in low-voltage digital systems. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and functional equivalence to support component availability and supply chain flexibility.

Key Parameters

Parameter	Value
Logic Type	Buffer, Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	24mA, 24mA
Voltage - Supply	2V ~ 3.6V
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the SN74LVC540AQDWREP are identified based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Logic type and function (Buffer, Inverting)
Element and bit configuration (1 element, 8 bits per element)
Output type (3-State)
Output current capability (24mA, 24mA)
Supply voltage range (2V ~ 3.6V)
Package type and dimensions (20-SOIC)
Surface mount compatibility
RoHS3 compliance

Two substitute parts meet these core requirements: CLVC540AQDWRG4Q1 (Texas Instruments, automotive-qualified) and MC74LCX540DWR2G (onsemi). Both maintain functional equivalence and package compatibility with the main part number.

Parameter Comparison

Parameter	SN74LVC540AQDWREP	CLVC540AQDWRG4Q1	MC74LCX540DWR2G
Manufacturer	Texas Instruments	Texas Instruments	onsemi
Logic Type	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting
Number of Elements	1	1	1
Number of Bits per Element	8	8	8
Output Type	3-State	3-State	3-State
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA
Voltage - Supply	2V ~ 3.6V	2V ~ 3.6V	2V ~ 3.6V
Operating Temperature	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TA)	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

All three parts maintain active product status and ROHS3 compliance. The SN74LVC540AQDWREP and CLVC540AQDWRG4Q1 are both Texas Instruments products with identical electrical specifications and operating temperature ranges (-40°C ~ 125°C). The CLVC540AQDWRG4Q1 carries AEC-Q100 automotive qualification, making it suitable for automotive applications requiring enhanced reliability standards.

The MC74LCX540DWR2G from onsemi provides functional equivalence with identical electrical parameters and package compatibility. The operating temperature range is limited to -40°C ~ 85°C, which is a narrower specification than the main part. Additionally, the MC74LCX540DWR2G has a Moisture Sensitivity Level (MSL) of 3 (168 Hours) compared to MSL 1 (Unlimited) for the other two parts, requiring stricter moisture control during storage and handling.

Selection between these parts depends on application requirements: use CLVC540AQDWRG4Q1 for automotive applications, use MC74LCX540DWR2G where temperature range and moisture sensitivity constraints are acceptable, or use SN74LVC540AQDWREP as the primary specification.

Frequently Asked Questions (FAQ)

Q: Can CLVC540AQDWRG4Q1 be used as a direct replacement for SN74LVC540AQDWREP?

A: Yes. Both parts are manufactured by Texas Instruments with identical electrical specifications, output current ratings, supply voltage range, operating temperature range, and 20-SOIC package dimensions. The CLVC540AQDWRG4Q1 includes AEC-Q100 automotive qualification, making it suitable for both general and automotive applications.

Q: What are the limitations of using MC74LCX540DWR2G as a substitute?

A: The MC74LCX540DWR2G has two parameter differences: the operating temperature range is -40°C ~ 85°C (versus -40°C ~ 125°C for the main part), and the Moisture Sensitivity Level is 3 (168 Hours) instead of 1 (Unlimited). These differences require evaluation against specific application temperature requirements and storage/handling procedures.

Q: Are all substitute parts in the same package?

A: Yes. All three parts use the 20-SOIC (0.295", 7.50mm Width) surface mount package with identical pin configurations, enabling direct PCB layout compatibility.

Q: Do all parts meet RoHS compliance requirements?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements.

Q: What is the significance of the Moisture Sensitivity Level (MSL) difference?

A: MSL 1 (Unlimited) indicates no moisture sensitivity restrictions during storage. MSL 3 (168 Hours) requires that the component be used within 168 hours of opening the moisture barrier bag. This affects supply chain handling, storage procedures, and component shelf life management.

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