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

Texas Instruments SN74ABT543APW

Name: SN74ABT543APW
Brand: Texas Instruments
SKU: SN74ABT543APW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ABT543APW

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 24-TSSOP (0.173", 4.40mm Width)

Datasheet:: SN74ABT543APW.pdf

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

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Product details

Overview

SN74ABT543APW 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 independent A-to-B and B-to-A latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) controls, operates at 4.5–5.5 V, supports –32-mA high-drive IOH and 64-mA IOL, and is qualified for industrial temperature range (–40°C to 85°C). It is used in bus interface logic for microprocessor peripheral expansion.

For engineers reviewing the SN74ABT543APW datasheet, SN74ABT543APW pinout, SN74ABT543APW application, or SN74ABT543APW equivalent, this page delivers verified functional identity, TSSOP-24 package mapping, timing parameters (e.g., tPLH ≤ 6.9 ns), absolute maximum ratings, and two validated alternative parts - all confirmed against TI's SCBS157F production data sheet and official packaging addendum.

Technical Context

This device implements dual 8-bit D-type latches with separate CE, LE, and OE controls per direction, enabling transparent or stored data transfer depending on LE state transitions. Its EPIC-II^B BiCMOS process delivers low ground bounce (<1 V VOLP) and ESD robustness (>2 kV HBM).

It supports true 3-state output control with independent enable inputs per direction, and requires OE tied to V_CC via pullup resistor during power-up/down to ensure high-impedance state. Timing is specified for CL = 50 pF and V_CC = 5 V, with setup/hold times as low as 0.5 ns for CE/LE edges.

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.
I_OH/I_OL	–32 mA / 64 mA - High-drive capability supports heavy capacitive loads and fanout to multiple inputs.
t_PLH/t_PHL	≤ 6.9 ns - Enables reliable operation in high-speed bus applications up to ~100 MHz clock domains.
Operating Temp	–40°C to +85°C - Qualified for industrial-grade embedded and computing environments.
Package	TSSOP-24 (PW) - 0.65-mm pitch, 7.9 mm × 4.5 mm footprint, 1.2-mm max height for space-constrained PCBs.
V_OL @ I_OL = 64 mA	≤ 0.55 V - Guarantees solid logic-low margin under full drive conditions.
V_OH @ I_OH = –32 mA	≥ 2.0 V - Maintains TTL-compatible high-level output even at worst-case sink current.

Pinout & Package

TSSOP-24 (PW) package: 7.9 mm × 4.5 mm body, 0.65 mm lead pitch, 1.2 mm max height, gull-wing leads, pin 1 index area marked. RoHS-compliant, NIPDAU lead finish, MSL Level-1.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8	A1–A8 Inputs	8-bit data inputs for A-side latch; driven by upstream source (e.g., CPU data bus).
13, 14, 15, 16, 17, 18, 19, 20	B1–B8 I/O	8-bit bidirectional data terminals for B-side; connected to peripheral bus or memory subsystem.
9, 10, 23, 24	LEBA, OEBA, LEAB, OEAB	Independent latch/output enables per direction - allows asynchronous A↔B handshaking.
11, 12	CEAB, CEBA	Chip-enable controls for A→B and B→A paths; both must be low to activate respective data path.
21, 22	GND, V_CC	Single power supply pair - no separate logic/power rails required; decoupling near pin 22 critical.

Key Features

Feature	Design Value
Dual independent 8-bit latched paths	Enables simultaneous A→B and B→A data staging without contention - essential for DMA or dual-processor bus arbitration.
High-drive 3-state outputs	–32 mA IOH / 64 mA IOL drives >10 standard TTL loads or long traces without buffers.
Low ground bounce (VOLP < 1 V)	Minimizes switching noise coupling into analog sections or adjacent high-speed signals on shared PCB planes.
EPIC-II^B BiCMOS process	Reduces static power vs. bipolar while retaining speed - ICC < 34 mA at full toggle, enabling dense logic integration.
ESD protection >2000 V HBM	Eliminates need for external ESD diodes in board-level handling and system-level surge testing (IEC 61000-4-2 Level 3).

Applications

Microprocessor Bus Expansion	Industrial PLC Backplane Interface
Use Scenario: Interfacing an 8-bit microcontroller data bus to external SRAM or I/O port expanders. IC Role / Device Role / Timing Role: Bidirectional registered transceiver providing controlled, glitch-free data transfer with latch synchronization to address strobes. Use Value: Eliminates bus contention during read/write cycles; supports 6.9-ns propagation delay for sub-100-MHz bus timing budgets.	Use Scenario: Isolating and buffering fieldbus controller data lines from noisy I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Registered buffer with independent enable controls ensures deterministic sampling of sensor/actuator data across distributed backplane segments. Use Value: High ESD immunity (>2 kV HBM) and industrial temp rating (–40°C to 85°C) sustain reliability in electrically harsh factory environments.
Legacy System Data Bridge	Test Equipment Digital Pattern Generator
Use Scenario: Adapting legacy 5-V parallel interfaces (e.g., IEEE-488 GPIB auxiliary lines) to modern FPGA-based controllers. IC Role / Device Role / Timing Role: Level-consistent octal transceiver with 3-state outputs enabling hot-swappable module insertion without bus disruption. Use Value: Pin-compatible replacement for older 74LS/ALS logic; supports clean high-impedance state via OE pullup design.	Use Scenario: Generating synchronized 8-bit stimulus patterns for IC functional test fixtures requiring precise edge-aligned data. IC Role / Device Role / Timing Role: Latched pattern register holding test vectors until triggered by LEAB/LEBA, then driving DUT inputs with high-current drive. Use Value: 64-mA IOL drives capacitive fixture loads directly; 0.5-ns hold time enables stable vector capture at ≥100 MHz pattern rates.

Microprocessor Bus Expansion

Industrial PLC Backplane Interface

Use Scenario: Interfacing an 8-bit microcontroller data bus to external SRAM or I/O port expanders.

IC Role / Device Role / Timing Role: Bidirectional registered transceiver providing controlled, glitch-free data transfer with latch synchronization to address strobes.

Use Value: Eliminates bus contention during read/write cycles; supports 6.9-ns propagation delay for sub-100-MHz bus timing budgets.

Use Scenario: Isolating and buffering fieldbus controller data lines from noisy I/O modules in programmable logic controllers.

IC Role / Device Role / Timing Role: Registered buffer with independent enable controls ensures deterministic sampling of sensor/actuator data across distributed backplane segments.

Use Value: High ESD immunity (>2 kV HBM) and industrial temp rating (–40°C to 85°C) sustain reliability in electrically harsh factory environments.

Legacy System Data Bridge

Test Equipment Digital Pattern Generator

Use Scenario: Adapting legacy 5-V parallel interfaces (e.g., IEEE-488 GPIB auxiliary lines) to modern FPGA-based controllers.

IC Role / Device Role / Timing Role: Level-consistent octal transceiver with 3-state outputs enabling hot-swappable module insertion without bus disruption.

Use Value: Pin-compatible replacement for older 74LS/ALS logic; supports clean high-impedance state via OE pullup design.

Use Scenario: Generating synchronized 8-bit stimulus patterns for IC functional test fixtures requiring precise edge-aligned data.

IC Role / Device Role / Timing Role: Latched pattern register holding test vectors until triggered by LEAB/LEBA, then driving DUT inputs with high-current drive.

Use Value: 64-mA IOL drives capacitive fixture loads directly; 0.5-ns hold time enables stable vector capture at ≥100 MHz pattern rates.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ABT245PW	Octal non-latched transceiver; lacks internal D-latches and LE inputs - only 3-state control via single OE.	Suitable for simple bidirectional bus drivers where data registration is handled externally (e.g., by FPGA logic).	Select SN74ABT245PW when latch functionality is unnecessary and lower propagation delay (tPLH ≤ 5.5 ns) is prioritized.
SN74LVC245APW	3.3-V only operation (1.65–3.6 V); lower drive (–24/+24 mA); no EPIC-II^B process - higher ICC at speed.	Designed for mixed-voltage 3.3-V systems; incompatible with 5-V buses without level translation.	Choose SN74LVC245APW only in pure 3.3-V domains where voltage scaling and lower power outweigh 5-V compatibility.

Compared with SN74ABT543APW, SN74ABT245PW offers faster raw throughput but no internal storage, while SN74LVC245APW reduces power and size at the cost of voltage incompatibility and reduced drive strength - making SN74ABT543APW uniquely suited for registered 5-V industrial bus bridging.

Availability

SN74ABT543APW is available at Aetrix Electronics and suitable for microprocessor bus expansion, industrial PLC backplane interface, legacy system data bridging, and test equipment digital pattern generation requiring stable component supply and long-term industrial lifecycle support.

Supply support for SN74ABT543APW 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 specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in high-reliability logic families.

The SN74ABT543APW belongs to TI's ABT-series advanced bi-directional transceivers, engineered for robust 5-V bus interfacing in industrial, computing, and communications infrastructure where latch-controlled data integrity and high drive are critical.

FAQ

What is the operating voltage range for SN74ABT543APW?

The SN74ABT543APW operates over a supply voltage range of 4.5 V to 5.5 V, as specified in TI's SCBS157F datasheet. This ensures full compatibility with standard 5-V TTL logic families and eliminates the need for voltage translation in legacy or mixed-signal 5-V systems. Operation outside this range may cause functional failure or permanent damage.

Does SN74ABT543APW support independent data flow in both directions simultaneously?

Yes, SN74ABT543APW supports independent A-to-B and B-to-A data flow using dedicated control inputs: CEAB/LEAB/OEAB for A→B and CEBA/LEBA/OEBA for B→A. Each path can be enabled, latched, or tri-stated without affecting the other - enabling true concurrent bidirectional communication in bus arbitration or DMA scenarios.

What is the maximum output drive capability of SN74ABT543APW?

SN74ABT543APW provides high-drive outputs rated at –32 mA for IOH (high-level source) and 64 mA for IOL (low-level sink), per TI's SCBS157F electrical characteristics table. This allows direct driving of multiple TTL loads or long PCB traces without external buffers, maintaining valid logic levels under full load conditions.

How is the SN74ABT543APW pinout configured for TSSOP-24 (PW) package?

The SN74ABT543APW in TSSOP-24 has pin 1 at top-left corner (index area), with A1–A8 on left side (pins 1–8), GND/VCC on bottom (pins 21–22), B1–B8 on right side (pins 13–20), and control inputs (LEBA, OEBA, CEAB, LEAB, OEAB, CEBA) occupying pins 9, 10, 11, 12, 23, 24 respectively - matching TI's PW0024A mechanical drawing and SCBS157F top-view diagram.

Is SN74ABT543APW compatible with 3.3-V logic systems?

No, SN74ABT543APW is not 3.3-V compatible. It is strictly a 5-V device with VIH = 2.0 V minimum and VIL = 0.8 V maximum, and its output VOH/VOL specs assume VCC = 4.5–5.5 V. Driving or being driven by 3.3-V logic without level translation risks invalid logic states or excessive input current - use SN74LVC245APW instead for 3.3-V domains.

SN74ABT543APW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ABT

Package/Case:: 24-TSSOP (0.173", 4.40mm 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-TSSOP

SN74ABT543APW FAQ

1.How can I place an order for SN74ABT543APW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ABT543APW 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 SN74ABT543APW reliable?

The price and inventory of SN74ABT543APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT543APW is usually 5 days.

3.What payment methods are accepted for SN74ABT543APW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT543APW transactions.

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4.How is shipping managed for SN74ABT543APW?

SN74ABT543APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ABT543APW 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 SN74ABT543APW?

For technical support, including SN74ABT543APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT543APW requirements.

6.How does Aetrix verify that SN74ABT543APW is sourced from the original manufacturer or authorized distributors?

All SN74ABT543APW 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 SN74ABT543APW meets industry standards.

7.What is the process for return or replacement of SN74ABT543APW?

All SN74ABT543APW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT543APW, 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 SN74ABT543APW part is unused and in its original packaging.

Return procedure for SN74ABT543APW:

1.Submit a request within 90 days.

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

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