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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

Texas Instruments SN74ABT543ADW

Name: SN74ABT543ADW
Brand: Texas Instruments
SKU: SN74ABT543ADW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ABT543ADW

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 24-SOIC (0.295", 7.50mm Width)

Datasheet:: SN74ABT543ADW.pdf

Description:: IC TXRX NON-INVERT 5.5V 24SOIC

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Product details

Overview

SN74ABT543ADW from Texas Instruments is an octal registered transceiver with 3-state outputs, designed for bidirectional data flow control between two 8-bit buses. It features dual independent latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) controls, high-drive outputs (–32 mA IOH, 64 mA IOL), and operates over –40°C to 85°C at 4.5–5.5 V supply. It is used in bus interface logic for industrial control backplanes and memory expansion subsystems.

For engineers reviewing the SN74ABT543ADW datasheet, SN74ABT543ADW pinout, SN74ABT543ADW application, or SN74ABT543ADW equivalent, key selection criteria include its 24-pin SOIC (DW) package, EPIC-II^B BiCMOS process enabling low power dissipation and high noise immunity, and precise timing parameters including t_PLH/t_PHL ≤ 6.9 ns at 5 V.

Technical Context

The SN74ABT543ADW implements two independent 8-bit D-type latch registers-one for A-to-B and one for B-to-A data flow-each with dedicated CE, LE, and OE inputs. Its EPIC-II^B BiCMOS architecture delivers TTL-compatible input thresholds (V_IL = 0.8 V, V_IH = 2 V) and rail-to-rail output swing under load.

It supports hot-insertion-safe operation via controlled 3-state enable sequencing and includes robust ESD protection (>2000 V HBM, >200 V MM). Output ground bounce (V_OLP) is specified <1 V at V_CC = 5 V, TA = 25°C, ensuring signal integrity in dense PCB layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and CMOS systems without level-shifting.
Output Drive	–32 mA IOH / 64 mA IOL - Sustains clean logic levels driving multiple TTL loads or long traces.
Propagation Delay	t_PLH/t_PHL ≤ 6.9 ns (CL = 50 pF) - Enables reliable operation in high-speed bus applications up to ~100 MHz effective throughput.
Operating Temperature	–40°C to +85°C - Qualified for commercial and industrial ambient environments without derating.
ESD Protection	>2000 V HBM, >200 V MM - Reduces risk of handling damage and improves field reliability in uncontrolled assembly environments.
Input Clamp Current	–18 mA - Limits voltage excursion during transient overvoltage, protecting internal circuitry without external diodes.
Thermal Impedance θ_JA	81°C/W (DW package) - Supports continuous operation at full drive strength with minimal heatsinking on standard FR-4.

Pinout & Package

SN74ABT543ADW is housed in a 24-pin SOIC (DW) package per JEDEC MS-013, 7.5 mm body width, 2.35 mm height, 0.65 mm lead pitch. Pin 1 index is marked by a beveled corner or notch.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8	A1–A8 Inputs	Primary 8-bit data inputs for A-to-B register path; TTL-compatible thresholds ensure direct interfacing with legacy logic.
9–16	B1–B8 Outputs/Inputs	Bi-directional 8-bit bus terminals; configured as outputs when OEAB active, inputs when OEBA active.
17	CEAB	A-to-B chip enable - must be low to allow A-latch transparency or B-output activation.
18	GND	Power return reference for all logic and output stages; requires low-inductance connection to minimize ground bounce.
19	V_CC	+5 V supply for core logic and output drivers; decoupling capacitor (0.1 µF) required within 10 mm of this pin.
20	CEBA	B-to-A chip enable - enables B-latch transparency or A-output activation when low.
21–24	LEBA, OEBA, LEAB, OEAB	Independent latch and output enables per direction - allows asynchronous, non-overlapping bus arbitration and glitch-free handshaking.

Key Features

Feature	Design Value
Dual independent 8-bit latched paths	Enables simultaneous A→B and B→A data staging without contention, critical for full-duplex bus bridges.
High-current 3-state outputs	–32 mA source / 64 mA sink capability drives 10+ TTL loads or 50-Ω transmission lines directly.
EPIC-II^B BiCMOS process	Reduces static power to <350 µA (typ.) while maintaining TTL speed, lowering system thermal load.
Controlled output disable sequencing	OE tied to V_CC via pull-up ensures high-Z state at power-up/down, preventing bus contention during reset.
Low ground bounce (V_OLP < 1 V)	Maintains signal integrity across all 8 outputs switching simultaneously, verified at V_CC = 5 V, TA = 25°C.

Applications

Industrial Backplane Interface	Memory Expansion Subsystem
Use Scenario: Bidirectional data transfer between CPU bus and peripheral module slots in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Acts as a registered bus transceiver synchronizing data flow between asynchronous modules using LEAB/LEBA strobes. Use Value: Eliminates need for external clock-domain crossing logic; latch-enable timing (t_su = 3.5 ns) supports 100-MHz bus cycles.	Use Scenario: Interfacing a microcontroller's address/data bus to external SRAM or Flash memory arrays with separate read/write control. IC Role / Device Role / Timing Role: Provides registered, direction-controlled data path with independent OEAB/OEBA for read/write isolation. Use Value: Prevents bus contention during memory access transitions; 64-mA IOL drives heavy capacitive loads of multi-chip memory banks.
Test Equipment Data Acquisition	Legacy System Bus Bridge
Use Scenario: Capturing parallel sensor data streams (e.g., 8-channel ADC outputs) into a controller with precise timing alignment. IC Role / Device Role / Timing Role: Latches incoming A-port data on LEAB edge, then presents stable byte to B-port for controller read. Use Value: Input setup/hold times (t_su = 3.5 ns, t_h = 0.5 ns) guarantee reliable capture at 100+ MSPS sampling rates.	Use Scenario: Connecting ISA-bus peripherals to modern microcontroller-based host systems requiring protocol translation. IC Role / Device Role / Timing Role: Buffers and registers legacy 8-bit data/control signals while isolating timing domains via CEAB/CEBA gating. Use Value: Tolerates ISA's variable strobe timing; 3-state outputs prevent conflicts during bus grant arbitration.

Industrial Backplane Interface

Memory Expansion Subsystem

Use Scenario: Bidirectional data transfer between CPU bus and peripheral module slots in programmable logic controllers (PLCs).

IC Role / Device Role / Timing Role: Acts as a registered bus transceiver synchronizing data flow between asynchronous modules using LEAB/LEBA strobes.

Use Value: Eliminates need for external clock-domain crossing logic; latch-enable timing (t_su = 3.5 ns) supports 100-MHz bus cycles.

Use Scenario: Interfacing a microcontroller's address/data bus to external SRAM or Flash memory arrays with separate read/write control.

IC Role / Device Role / Timing Role: Provides registered, direction-controlled data path with independent OEAB/OEBA for read/write isolation.

Use Value: Prevents bus contention during memory access transitions; 64-mA IOL drives heavy capacitive loads of multi-chip memory banks.

Test Equipment Data Acquisition

Legacy System Bus Bridge

Use Scenario: Capturing parallel sensor data streams (e.g., 8-channel ADC outputs) into a controller with precise timing alignment.

IC Role / Device Role / Timing Role: Latches incoming A-port data on LEAB edge, then presents stable byte to B-port for controller read.

Use Value: Input setup/hold times (t_su = 3.5 ns, t_h = 0.5 ns) guarantee reliable capture at 100+ MSPS sampling rates.

Use Scenario: Connecting ISA-bus peripherals to modern microcontroller-based host systems requiring protocol translation.

IC Role / Device Role / Timing Role: Buffers and registers legacy 8-bit data/control signals while isolating timing domains via CEAB/CEBA gating.

Use Value: Tolerates ISA's variable strobe timing; 3-state outputs prevent conflicts during bus grant arbitration.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal registered transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ABT245DW	Octal non-latched transceiver; no internal registers; only OE-controlled 3-state, no LE function.	Suitable for simple bus buffering but lacks data staging capability for handshake protocols.	Select SN74ABT245DW only if latch functionality is unnecessary and lower propagation delay (≤5.5 ns) is prioritized.
SN74LVC8T245PW	3.3-V tolerant, dual-supply (1.65–5.5 V), lower drive (±24 mA), no EPIC-II^B process.	Designed for mixed-voltage systems; lacks 5-V bus drive strength and military-grade ESD robustness.	Choose SN74LVC8T245PW for 3.3-V-centric designs requiring level translation, not for legacy 5-V industrial backplanes.

Compared with SN74ABT245DW and SN74LVC8T245PW, the SN74ABT543ADW uniquely provides registered data flow control essential for synchronous bus arbitration, while delivering higher drive strength and proven 5-V system compatibility in harsh industrial environments.

Availability

SN74ABT543ADW is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion subsystems, and test equipment data acquisition requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SN74ABT543ADW includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74ABT543ADW belongs to TI's ABT logic family, engineered for high-speed, low-noise 5-V bus interfacing in mission-critical industrial control and instrumentation systems.

FAQ

What is the maximum operating frequency supported by SN74ABT543ADW?

The SN74ABT543ADW does not specify a maximum clock frequency, but its worst-case propagation delay (t_PLH/t_PHL ≤ 6.9 ns at V_CC = 5 V, CL = 50 pF) supports reliable operation in bus systems with cycle times ≥14 ns - effectively enabling use in 70+ MHz synchronous bus applications when combined with appropriate setup/hold margins. The SN74ABT543ADW timing is validated across –40°C to 85°C.

Can SN74ABT543ADW operate with a 3.3-V supply?

No. The SN74ABT543ADW is specified only for 4.5 V to 5.5 V operation per its recommended conditions. Applying 3.3 V violates the minimum V_CC requirement and will result in undefined logic states, excessive ICC, or functional failure. For 3.3-V systems, consider TI's SN74LVC8T245 instead. The SN74ABT543ADW requires strict adherence to its 5-V supply range.

How should unused inputs be handled on SN74ABT543ADW?

Per the datasheet (Note 3), all unused control inputs (CEAB, CEBA, LEAB, LEBA, OEAB, OEBA) must be held static-either tied to V_CC or GND-to prevent floating nodes that cause increased ICC, oscillation, or ESD susceptibility. Unused A/B port pins may be left open only if not connected to external traces; otherwise, terminate to V_CC or GND. This applies to every instance of SN74ABT543ADW in the design.

Does SN74ABT543ADW support hot-swap insertion?

The SN74ABT543ADW incorporates design features supporting controlled hot-swap behavior: its 3-state outputs enter high-impedance when OE is inactive, and the recommendation to tie OE to V_CC via a pull-up resistor ensures default high-Z at power-up. However, it lacks integrated hot-swap controllers or slew-rate limiting; external current-limiting and sequencing circuitry is required for full hot-swap compliance. This behavior is inherent to the SN74ABT543ADW architecture.

What is the thermal resistance (θ_JA) of SN74ABT543ADW in its DW package?

The SN74ABT543ADW in the SOIC (DW) package has a specified junction-to-ambient thermal resistance (θ_JA) of 81°C/W under standard JEDEC test conditions (single-layer copper, 1-in² pad). This value assumes no additional copper pour or airflow; actual board-level θ_JA will improve with thermal vias and ground-plane coupling. The SN74ABT543ADW's 81°C/W rating enables full-output operation without forced cooling in typical industrial PCB layouts.

SN74ABT543ADW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ABT

Package/Case:: 24-SOIC (0.295", 7.50mm Width)

Packaging:: Bulk

Product Status:: Active

Logic Type:: Transceiver, Non-Inverting

Number of Elements:: 1

Number of Bits per Element:: 8

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 32mA, 64mA

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-SOIC

SN74ABT543ADW FAQ

1.How can I place an order for SN74ABT543ADW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ABT543ADW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SN74ABT543ADW reliable?

The price and inventory of SN74ABT543ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT543ADW is usually 5 days.

3.What payment methods are accepted for SN74ABT543ADW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT543ADW transactions.

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SN74ABT543ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ABT543ADW order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SN74ABT543ADW?

For technical support, including SN74ABT543ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT543ADW requirements.

6.How does Aetrix verify that SN74ABT543ADW is sourced from the original manufacturer or authorized distributors?

All SN74ABT543ADW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74ABT543ADW meets industry standards.

7.What is the process for return or replacement of SN74ABT543ADW?

All SN74ABT543ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT543ADW, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SN74ABT543ADW part is unused and in its original packaging.

Return procedure for SN74ABT543ADW:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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