SN74LVC540ADBRE4 Equivalent & Substitute Parts

Part Overview

The SN74LVC540ADBRE4 is an inverting buffer logic integrated circuit manufactured by Texas Instruments, designed for 3.6V operation in 20-SSOP surface mount packaging. This part is classified as a Buffer, Inverting with 1 element and 8 bits per element, featuring 3-state output capability. The SN74LVC540ADBRE4 is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74LVC540ADBRE4
Manufacturer	Texas Instruments
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	1.65V ~ 3.6V
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	20-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitute parts for the SN74LVC540ADBRE4 are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Functional Parameters:

Logic Type: Buffer, Inverting
Number of Elements: 1
Number of Bits per Element: 8
Output Type: 3-State
Current - Output High, Low: 24mA, 24mA

Electrical Parameters:

Voltage - Supply range compatibility
Operating Temperature range

Mechanical Parameters:

Package / Case type and pin count
Mounting Type: Surface Mount

The SN74LVC540ADBR from Texas Instruments is a direct substitute with identical electrical specifications and packaging. The 74LCX540MTC and 74LCX540MTCX from Fairchild Semiconductor are qualified substitutes with compatible logic function, output characteristics, and pin configuration, though with different package designations (20-TSSOP vs. 20-SSOP) and slightly different voltage supply ranges.

Parameter Comparison

Parameter	SN74LVC540ADBRE4	SN74LVC540ADBR	74LCX540MTC	74LCX540MTCX
Manufacturer	Texas Instruments	Texas Instruments	Fairchild Semiconductor	Fairchild Semiconductor
Logic Type	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting
Number of Elements	1	1	1	1
Number of Bits per Element	8	8	8	8
Output Type	3-State	3-State	3-State	3-State
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Voltage - Supply	1.65V ~ 3.6V	1.65V ~ 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)	-40°C ~ 85°C (TA)
Package / Case	20-SSOP (0.209", 5.30mm Width)	20-SSOP (0.209", 5.30mm Width)	20-TSSOP (0.173", 4.40mm Width)	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Discontinued at DiGi Electronics	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: SN74LVC540ADBR

The SN74LVC540ADBR is the recommended substitute for the SN74LVC540ADBRE4. Both parts are manufactured by Texas Instruments and share identical electrical specifications, including voltage supply range (1.65V ~ 3.6V), operating temperature range (-40°C ~ 125°C), and output current ratings (24mA, 24mA). The SN74LVC540ADBR maintains the same 20-SSOP package configuration and is ROHS3 compliant. This part is currently active in production with higher inventory availability (3200 Pcs).

Secondary Substitutes: 74LCX540MTC and 74LCX540MTCX

The 74LCX540MTC and 74LCX540MTCX from Fairchild Semiconductor are functionally equivalent alternatives. Both maintain the same logic function, output type (3-State), and output current specifications. These parts are currently active in production. Design considerations include:

Voltage supply range: 2V ~ 3.6V (vs. 1.65V ~ 3.6V for the original part). Applications requiring operation below 2V are not compatible with these substitutes.
Operating temperature range: -40°C ~ 85°C (vs. -40°C ~ 125°C for the original part). Applications requiring operation above 85°C are not compatible with these substitutes.
Package designation: 20-TSSOP (0.173", 4.40mm Width) vs. 20-SSOP (0.209", 5.30mm Width). PCB layout modifications are required for package migration.

Frequently Asked Questions (FAQ)

Q: Can the SN74LVC540ADBR be used as a direct replacement for the SN74LVC540ADBRE4?

A: Yes. The SN74LVC540ADBR is a direct substitute with identical electrical specifications and packaging. No design modifications are required.

Q: What are the key differences between the Texas Instruments 74LVC series and the Fairchild 74LCX series substitutes?

A: The primary differences are voltage supply range and operating temperature range. The 74LVC series operates from 1.65V ~ 3.6V and -40°C ~ 125°C, while the 74LCX series operates from 2V ~ 3.6V and -40°C ~ 85°C. Both series maintain identical logic function, output type, and current specifications.

Q: Can I use the 74LCX540MTC or 74LCX540MTCX if my application requires operation below 2V?

A: No. The 74LCX series has a minimum supply voltage of 2V. Applications requiring operation below 2V require the SN74LVC540ADBR or equivalent 74LVC series parts.

Q: Are package changes required when substituting with the 74LCX540MTC or 74LCX540MTCX?

A: Yes. The 74LCX540MTC and 74LCX540MTCX use 20-TSSOP packaging (0.173", 4.40mm Width), while the original part uses 20-SSOP packaging (0.209", 5.30mm Width). PCB layout modifications are necessary for package migration, though pin count and configuration remain compatible.

Q: What is the compliance status of these substitute parts?

A: The SN74LVC540ADBR is ROHS3 compliant. The 74LCX540MTCX is ROHS3 compliant. The 74LCX540MTC compliance status is not specified in available documentation.

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