74LVC540ADTR2G Equivalent & Substitute Parts

Part Overview

The 74LVC540ADTR2G is an inverting buffer logic IC manufactured by onsemi, designed for 3-state output applications in low-voltage digital circuits. This device features 1 element with 8 bits per element, operating across a supply voltage range of 1.2V to 3.6V and a temperature range of -40°C to 125°C. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. Substitute parts maintain functional equivalence while offering active product status and improved availability.

Substiute Parts

74LVC540ADTR2G

onsemiIn Stock: 82774LVC540ADTR2G Datasheet

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MC74LCX540DTR2G

onsemiIn Stock: 5598MC74LCX540DTR2G Datasheet

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SN74LVC540ADBR

Texas InstrumentsIn Stock: 3254SN74LVC540ADBR Datasheet

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SN74LVC540APW

Texas InstrumentsIn Stock: 2391SN74LVC540APW Datasheet

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SN74LVC540APWT

Texas InstrumentsIn Stock: 5591SN74LVC540APWT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74LVC540ADTR2G is determined by the following critical parameters:

• Logic Type: Buffer, Inverting (must match exactly)
• Number of Elements: 1 (must match exactly)
• Number of Bits per Element: 8 (must match exactly)
• Output Type: 3-State (must match exactly)
• Current - Output High, Low: 24mA, 24mA (must match exactly)
• Mounting Type: Surface Mount (must match exactly)
• RoHS Status: ROHS3 Compliant (must match exactly)
• Moisture Sensitivity Level: 1 (Unlimited) (must match exactly)

Substitute parts are grouped into two categories based on package compatibility and voltage supply range:

Group 1 (20-TSSOP Package, Extended Voltage Range): SN74LVC540APWT and SN74LVC540APW from Texas Instruments maintain the original 20-TSSOP package footprint with supply voltage range of 1.65V ~ 3.6V and operating temperature of -40°C ~ 125°C.

Group 2 (20-TSSOP Package, Reduced Voltage Range): MC74LCX540DTR2G from onsemi uses the 20-TSSOP package with supply voltage range of 2V ~ 3.6V and operating temperature of -40°C ~ 85°C.

Group 3 (20-SSOP Package, Extended Voltage Range): SN74LVC540ADBR from Texas Instruments features a 20-SSOP package (0.209", 5.30mm Width) with supply voltage range of 1.65V ~ 3.6V and operating temperature of -40°C ~ 125°C.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain active product status, ensuring long-term availability and supply chain reliability compared to the obsolete 74LVC540ADTR2G. All substitutes are ROHS3 compliant and carry MSL rating of 1 (Unlimited), matching the original part's environmental compliance profile.

For applications requiring the original 20-TSSOP package footprint with extended operating temperature range (-40°C ~ 125°C), select SN74LVC540APWT or SN74LVC540APW from Texas Instruments. These parts provide supply voltage compatibility down to 1.65V, which is higher than the original 1.2V minimum but suitable for standard 3.3V and lower voltage logic applications.

For applications with reduced temperature requirements (-40°C ~ 85°C) and preference for onsemi sourcing, MC74LCX540DTR2G maintains the 20-TSSOP package with supply voltage range of 2V ~ 3.6V.

For applications where package footprint flexibility exists, SN74LVC540ADBR offers the 20-SSOP package variant with extended operating temperature range (-40°C ~ 125°C) and supply voltage range of 1.65V ~ 3.6V from Texas Instruments.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC540APWT directly replace 74LVC540ADTR2G in existing PCB designs?

A: Yes, SN74LVC540APWT is a direct footprint replacement. Both use the 20-TSSOP package with identical pin configuration and electrical characteristics (24mA output current, 3-state output, 8-bit inverting buffer). The supply voltage range of 1.65V ~ 3.6V covers standard 3.3V and lower voltage applications. Verify your circuit's minimum supply voltage requirement does not fall below 1.65V.

Q: What is the difference between 20-TSSOP and 20-SSOP packages?

A: Both are surface-mount packages with 20 pins, but differ in physical dimensions. The 20-TSSOP (0.173", 4.40mm width) is narrower than the 20-SSOP (0.209", 5.30mm width). PCB layout and footprint compatibility must be verified before selecting SN74LVC540ADBR, which uses the 20-SSOP package.

Q: Why does MC74LCX540DTR2G have a lower maximum operating temperature than the original part?

A: MC74LCX540DTR2G operates to 85°C maximum, compared to 125°C for the original 74LVC540ADTR2G. This is a design characteristic of the 74LCX series. Select this part only if your application's maximum ambient temperature does not exceed 85°C.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts (MC74LCX540DTR2G, SN74LVC540ADBR, SN74LVC540APW, SN74LVC540APWT) are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the original part's environmental compliance.

Q: Which substitute part offers the widest supply voltage range?

A: The original 74LVC540ADTR2G operates from 1.2V ~ 3.6V. Among active substitutes, SN74LVC540ADBR, SN74LVC540APW, and SN74LVC540APWT all operate from 1.65V ~ 3.6V. MC74LCX540DTR2G operates from 2V ~ 3.6V. If your circuit requires operation below 1.65V, none of the active substitutes are suitable.