74LVC543ADB,112 Equivalent & Substitute Parts

Part Overview

The 74LVC543ADB,112 is a non-inverting transceiver logic integrated circuit manufactured by NXP USA Inc. in the 74LVC series. This device functions as a 1-element, 8-bit transceiver with 3-state output capability, designed for low-voltage CMOS applications operating between 1.2V and 3.6V. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. Substitute parts maintain functional equivalence while offering active product status and improved availability.

Substiute Parts

74LVC543ADB,112

NXP USA Inc.In Stock: 95374LVC543ADB,112 Datasheet

Current PartRFQ

74LCX543MTCX

Fairchild SemiconductorIn Stock: 295474LCX543MTCX Datasheet

MFR RecommendedRFQ

SN74LVC543ADBR

Texas InstrumentsIn Stock: 3328SN74LVC543ADBR Datasheet

MFR RecommendedRFQ

SN74LVC543APW

Texas InstrumentsIn Stock: 908SN74LVC543APW Datasheet

MFR RecommendedRFQ

SN74LVC543APWR

Texas InstrumentsIn Stock: 4108SN74LVC543APWR Datasheet

MFR RecommendedRFQ

SN74LVC543APWT

Texas InstrumentsIn Stock: 1508SN74LVC543APWT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74LVC543ADB,112 is determined by the following critical parameters:

Functional Parameters (Must Match):

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

Electrical Parameters (Must Be Compatible):

• Voltage - Supply: Substitute must support the 1.2V ~ 3.6V range or a subset thereof
• Operating Temperature: Substitute must support -40°C ~ 125°C or a subset thereof

Physical Parameters (Package Compatibility):

• Mounting Type: Surface Mount (required)
• Package / Case: 24-SSOP or 24-TSSOP (both acceptable for pin-compatible substitution)

Compliance Parameters:

• RoHS Status: ROHS3 Compliant (required)

All substitute parts listed maintain identical functional specifications, output drive capability, and logic configuration. Variations in supply voltage range and operating temperature represent acceptable substitutions when the substitute range encompasses the application's operating conditions.

Parameter Comparison

Engineering Selection Recommendations

Same Package Substitutes (24-SSOP): The SN74LVC543ADBR from Texas Instruments maintains identical package geometry (24-SSOP, 0.209" width) to the original 74LVC543ADB,112. This substitute offers active product status, ROHS3 compliance, and operates within a supply voltage range of 1.65V ~ 3.6V. The operating temperature range is -40°C ~ 85°C. Selection of this part eliminates PCB layout modifications and is suitable for applications where the reduced temperature upper limit (85°C vs. 125°C) is acceptable.

Alternative Package Substitutes (24-TSSOP): The SN74LVC543APW, SN74LVC543APWR, and SN74LVC543APWT from Texas Instruments, along with the 74LCX543MTCX from Fairchild Semiconductor, utilize the 24-TSSOP package (0.173" width). These parts are functionally equivalent and offer active product status with ROHS3 compliance. The narrower package footprint may require PCB layout revision. All Texas Instruments variants operate at 1.65V ~ 3.6V supply voltage and -40°C ~ 85°C temperature range. The Fairchild part operates at 2V ~ 3.6V supply voltage with the same temperature range.

Compliance and Availability: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory requirements. Texas Instruments parts demonstrate higher current inventory levels (863 to 4080 units), providing superior procurement reliability compared to the obsolete original part (869 units).

Frequently Asked Questions (FAQ)

Q: Can the 74LCX543MTCX from Fairchild substitute for the 74LVC543ADB,112? A: The 74LCX543MTCX is functionally equivalent with identical logic configuration, output drive capability, and 3-state output characteristics. The primary difference is the supply voltage range: the Fairchild part operates at 2V ~ 3.6V versus the original 1.2V ~ 3.6V. Substitution is valid if your application operates above 2V. The package is 24-TSSOP, requiring PCB layout modification from the original 24-SSOP.

Q: What is the difference between 24-SSOP and 24-TSSOP packages? A: Both are surface-mount packages with 24 pins and identical pin configurations. The primary difference is width: 24-SSOP measures 0.209" (5.30mm) while 24-TSSOP measures 0.173" (4.40mm). The narrower TSSOP package requires PCB footprint redesign. Pin pitch and electrical characteristics remain compatible.

Q: Are the Texas Instruments SN74LVC543 variants interchangeable? A: The SN74LVC543ADBR, SN74LVC543APW, SN74LVC543APWR, and SN74LVC543APWT are functionally identical. Differences exist only in packaging format (Tape & Reel vs. Tube) and physical package type (24-SSOP vs. 24-TSSOP). Selection depends on PCB layout requirements and procurement packaging preferences.

Q: Why does the original part list an operating temperature of -40°C ~ 125°C while substitutes are -40°C ~ 85°C? A: The operating temperature range is a specified parameter that varies by manufacturer and product line. The substitute parts from Texas Instruments and Fairchild are rated to -40°C ~ 85°C. If your application requires operation above 85°C, these substitutes are not suitable. Verify your application's maximum operating temperature requirement before selection.

Q: Is the reduced supply voltage range of the Fairchild 74LCX543MTCX (2V ~ 3.6V) a limitation? A: The reduced range is a limitation only if your application requires operation below 2V. If your design operates within 2V ~ 3.6V, the Fairchild part is fully compatible. The Texas Instruments variants support 1.65V ~ 3.6V, providing broader voltage compatibility.

Q: Do all substitute parts maintain ROHS3 compliance? A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original 74LVC543ADB,112.