SN74F543NT Equivalent & Substitute Parts

Part Overview

The SN74F543NT is a non-inverting transceiver IC manufactured by Texas Instruments, designed for 8-bit data transmission with 3-state output capability. This component operates within a 4.5V to 5.5V supply voltage range and is housed in a 24-pin DIP package for through-hole mounting applications.

The SN74F543NT carries an obsolete product status. Locating equivalent substitute parts is necessary to support legacy system maintenance, board repairs, and continued production of equipment utilizing this component. Active alternatives with identical electrical specifications and compatible pinouts are available to ensure design continuity.

Substiute Parts

SN74F543NT

Texas InstrumentsIn Stock: 1032SN74F543NT Datasheet

Current PartRFQ

SN74F543DWR

Texas InstrumentsIn Stock: 4011SN74F543DWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74F543NT is determined by strict equivalence across the following critical parameters:

• Logic Type: Transceiver, Non-Inverting
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: 3-State
• Voltage - Supply: 4.5V ~ 5.5V
• Operating Temperature: 0°C ~ 70°C (TA)
• Current - Output High: 3mA, 24mA
• Current - Output Low: 15mA, 64mA
• Base Product Number: 74F543
• Series: 74F

The SN74F543DWR qualifies as a manufacturer-recommended substitute. Both parts share identical electrical specifications, logic functionality, and thermal operating range. The primary difference is packaging format: the SN74F543NT uses through-hole 24-DIP mounting, while the SN74F543DWR employs surface-mount 24-SOIC packaging. This distinction affects board layout and assembly methodology but does not alter electrical compatibility or functional performance.

Parameter Comparison

Engineering Selection Recommendations

The SN74F543DWR is the manufacturer-recommended substitute for the obsolete SN74F543NT. Both components maintain identical electrical specifications, ensuring functional equivalence in circuit applications.

Selection between these parts depends on board design constraints:

For through-hole PCB designs requiring the original form factor, the SN74F543NT remains available in limited inventory (1006 pieces). However, given its obsolete status, long-term availability cannot be assured.

For new designs or board revisions, the SN74F543DWR is the preferred choice. It offers active product status, ensuring continued availability and supply chain stability. The surface-mount 24-SOIC package requires PCB layout modification but provides advantages in board density and automated assembly compatibility.

Both parts carry ROHS3 compliance and unlimited moisture sensitivity rating, meeting modern environmental and reliability standards.

Frequently Asked Questions (FAQ)

Q: Can the SN74F543DWR directly replace the SN74F543NT in an existing circuit?

A: Electrical substitution is complete. Pin-to-pin compatibility exists for all signal and power connections. Physical board layout modification is required due to package format differences (DIP versus SOIC). Adapter sockets or PCB redesign may be necessary depending on the application.

Q: What is the primary difference between these two parts?

A: The SN74F543NT uses through-hole 24-DIP packaging for manual or wave soldering assembly. The SN74F543DWR uses surface-mount 24-SOIC packaging for automated pick-and-place assembly. All electrical parameters, logic functionality, and performance characteristics are identical.

Q: Why is the SN74F543NT listed as obsolete?

A: The SN74F543NT has reached end-of-life status with Texas Instruments. The manufacturer has transitioned production to the SN74F543DWR, which employs modern surface-mount technology. Existing inventory remains available but is finite.

Q: Are there any compliance or certification differences?

A: Both parts carry identical RoHS3 compliance and unlimited moisture sensitivity ratings. No compliance or certification differences exist between the two components.

Q: What supply voltage range do these parts support?

A: Both the SN74F543NT and SN74F543DWR operate within a 4.5V to 5.5V supply voltage range. Operating temperature range is 0°C to 70°C for both parts.

Q: Can I use the SN74F543DWR in a legacy system designed for the SN74F543NT?

A: Electrical compatibility is assured. Physical integration requires board modification or the use of adapter solutions to accommodate the SOIC package format. Functional performance will be identical once properly integrated.