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

NXP Semiconductors 74ABT543APW,118

Name: 74ABT543APW,118
Brand: NXP Semiconductors
SKU: 74ABT543APW,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74ABT543APW,118

Manufacturer:: NXP Semiconductors

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74ABT543APW,118.pdf

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

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Product details

Overview

74ABT543APW,118 from Nexperia is an octal latched transceiver with dual-directional D-type latch registers, 3-state outputs, and independent A-to-B and B-to-A control (LEAB/OEAB/EAB and LEBA/OEBA/EBA). It operates from 4.5 V to 5.5 V, delivers ±32 mA/±64 mA output drive, and supports −40 °C to +85 °C industrial temperature range. It is used in bidirectional data buffering between bus domains with temporary storage.

For engineers reviewing the 74ABT543APW,118 datasheet, 74ABT543APW,118 pinout, 74ABT543APW,118 application, or 74ABT543APW,118 equivalent, key selection criteria include latch enable timing (tWL = 3.5 ns min), propagation delay (tPLH = 1.0–5.2 ns), output drive asymmetry (+64 mA sink / −32 mA source), and TSSOP24 package compatibility with high-density PCB layouts.

Technical Context

The 74ABT543APW,118 integrates two independent 8-bit D-type latch banks - one for A-to-B flow and one for B-to-A flow - each with dedicated latch enable (LE), output enable (OE), and direction enable (E) inputs. This enables concurrent or isolated bidirectional data staging without bus contention.

Its BiCMOS architecture delivers low static current (ICC ≤ 250 µA in HIGH/LOW states) alongside fast switching (tPLH/tPHL ≤ 5.2/5.7 ns at VCC = 5.0 V), while maintaining robust ESD immunity (HBM > 2000 V, MM > 200 V) and latch-up protection (>500 mA per JESD78B Class II Level A).

Key Specifications

Parameter	Value and Actual Design Meaning
Supply voltage	4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails and tolerant of typical power rail ripple.
Output drive	+64 mA sink / −32 mA source - sufficient to drive heavy capacitive loads or multiple TTL inputs without external buffers.
Propagation delay	1.0–5.2 ns (tPLH, A/B to B/A) - enables sub-200 MHz bus operation with tight timing margins.
Latch pulse width	≥3.5 ns minimum (tWL) - supports high-speed register capture without violating setup/hold windows.
Operating temperature	−40 °C to +85 °C - qualified for industrial-grade embedded systems and computing backplanes.
ESD rating	HBM > 2000 V, MM > 200 V - meets IEC 61000-4-2 level 2 for board-level handling robustness.
Package	TSSOP24 (SOT355-1), 4.4 mm body width - surface-mount footprint optimized for space-constrained PCBs.

Pinout & Package

TSSOP24 plastic thin shrink small outline package (SOT355-1), 24-lead, 0.65 mm pitch, 4.4 mm body width, lead finish matte tin.

Pin/Terminal	Circuit Role	Design Meaning
1 (LEBA)	B-to-A latch enable input	Active LOW; captures B-side data into B-to-A latches on rising edge when OEBA and EBA are asserted.
2 (OEBA)	B-to-A output enable input	Active LOW; enables/disables B-to-A 3-state outputs independently of latch state.
3–10 (A0–A7)	A-side bidirectional I/O	Data path for A-to-B or B-to-A transfer; electrically buffered with 3-state control and latch storage.
11 (EAB)	A-to-B enable input	Active LOW; enables A-to-B data path transparency or latched mode depending on LEAB/OEAB state.
12 (GND)	Ground reference	Primary 0 V return for all internal logic and output drivers; must be low-inductance connection.
13 (OEAB)	A-to-B output enable input	Active LOW; controls 3-state behavior of A-to-B outputs without affecting latch contents.
14 (LEAB)	A-to-B latch enable input	Active LOW; samples A-side data on rising edge when EAB and OEAB are asserted.
15–22 (B0–B7)	B-side bidirectional I/O	Complementary data path to A0–A7; supports full-duplex staging between separate bus domains.
23 (EBA)	B-to-A enable input	Active LOW; enables B-to-A path transparency or latched operation, decoupled from A-side controls.
24 (VCC)	Positive supply	+4.5 V to +5.5 V power rail; requires local 100 nF ceramic decoupling adjacent to pin.

Key Features

Feature	Design Value
Dual independent latch banks	Enables simultaneous A→B and B→A data staging without arbitration logic or shared control timing.
Separate direction enable (EAB/EBA) and output enable (OEAB/OEBA)	Allows transparent, latched, or high-Z states per direction - critical for hot-swap and bus isolation.
Power-up 3-state and reset	Outputs default to high-impedance at power-on, preventing bus conflicts during system initialization.
Live insertion/extraction support	Input clamping (VIK = −1.2 V) and controlled ICC behavior allow safe in-circuit replacement without system shutdown.
Back-to-back register architecture	Eliminates need for external glue logic when interfacing mismatched clock domains or asynchronous subsystems.

Applications

Industrial Backplane Interface	Memory-Mapped I/O Expansion
Use Scenario: Bidirectional data exchange between a microcontroller bus and a fieldbus controller (e.g., CAN or RS-485 interface IC) across galvanically isolated barriers. IC Role / Device Role / Timing Role: Acts as a latch-buffered bus transceiver, holding data during isolation barrier latency and enabling synchronized read/write handshaking. Use Value: Eliminates external latch ICs and reduces PCB area by 30% versus discrete 74ABT245 + 74ABT373 solution.	Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU via parallel memory-mapped peripheral interface with address/data multiplexing. IC Role / Device Role / Timing Role: Provides registered data capture on address-valid strobes and drives expanded peripheral data lines with controlled slew rate. Use Value: Supports 100+ ns setup/hold timing margins at 50 MHz bus clock, enabling reliable peripheral access without FPGA glue logic.
Test Equipment Digital Pattern Generator	Legacy ISA Bus Adapter
Use Scenario: Generating deterministic digital stimulus patterns in automated test equipment where pattern stability must persist across trigger events. IC Role / Device Role / Timing Role: Stores pattern words in latched registers and drives them onto DUT pins with precise timing alignment using LEAB/LEBA strobes. Use Value: Achieves <5 ns jitter on pattern edges due to matched tPLH/tPHL and low-propagation-delay BiCMOS core.	Use Scenario: Adapting modern peripherals to legacy PC/AT ISA bus architecture requiring bidirectional 8-bit data transfer with handshake signals. IC Role / Device Role / Timing Role: Serves as the primary data transceiver between ISA data bus and FPGA-based peripheral controller, managing DIR, IOR/IOW, and READY timing. Use Value: Meets ISA specification's 250 ns maximum data hold time with tWL ≥ 3.5 ns and guaranteed VOL ≤ 0.55 V at 64 mA.

Industrial Backplane Interface

Memory-Mapped I/O Expansion

Use Scenario: Bidirectional data exchange between a microcontroller bus and a fieldbus controller (e.g., CAN or RS-485 interface IC) across galvanically isolated barriers.

IC Role / Device Role / Timing Role: Acts as a latch-buffered bus transceiver, holding data during isolation barrier latency and enabling synchronized read/write handshaking.

Use Value: Eliminates external latch ICs and reduces PCB area by 30% versus discrete 74ABT245 + 74ABT373 solution.

Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU via parallel memory-mapped peripheral interface with address/data multiplexing.

IC Role / Device Role / Timing Role: Provides registered data capture on address-valid strobes and drives expanded peripheral data lines with controlled slew rate.

Use Value: Supports 100+ ns setup/hold timing margins at 50 MHz bus clock, enabling reliable peripheral access without FPGA glue logic.

Test Equipment Digital Pattern Generator

Legacy ISA Bus Adapter

Use Scenario: Generating deterministic digital stimulus patterns in automated test equipment where pattern stability must persist across trigger events.

IC Role / Device Role / Timing Role: Stores pattern words in latched registers and drives them onto DUT pins with precise timing alignment using LEAB/LEBA strobes.

Use Value: Achieves <5 ns jitter on pattern edges due to matched tPLH/tPHL and low-propagation-delay BiCMOS core.

Use Scenario: Adapting modern peripherals to legacy PC/AT ISA bus architecture requiring bidirectional 8-bit data transfer with handshake signals.

IC Role / Device Role / Timing Role: Serves as the primary data transceiver between ISA data bus and FPGA-based peripheral controller, managing DIR, IOR/IOW, and READY timing.

Use Value: Meets ISA specification's 250 ns maximum data hold time with tWL ≥ 3.5 ns and guaranteed VOL ≤ 0.55 V at 64 mA.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ABT543PW	Same logic function, pinout, and AC/DC specs; TI-manufactured, identical TSSOP24 package (PW suffix), but lower HBM ESD rating (1500 V vs. 2000 V).	Suitable for non-handling-intensive production environments; not recommended for manual assembly or field-replaceable modules.	Select SN74ABT543PW only if TI supply chain integration or existing TI BOM alignment is required.
74LVT543PW	Lower VCC range (2.7–3.6 V), reduced drive (±24 mA), slower propagation (tPLH up to 7.5 ns); otherwise identical pinout and register structure.	Applicable only in 3.3 V systems with relaxed timing budgets; incompatible with 5 V buses or high-capacitance loads.	Choose 74LVT543PW exclusively for 3.3 V domain bridging where power efficiency outweighs speed and drive strength.

Compared with SN74ABT543PW and 74LVT543PW, the 74ABT543APW,118 provides superior 5 V drive capability, faster timing, and higher ESD robustness - making it the preferred choice for industrial backplanes, test equipment, and mixed-voltage bus interfaces demanding reliability and performance headroom.

Availability

74ABT543APW,118 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory-mapped I/O expansion, and legacy bus adapters requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 74ABT543APW,118 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

Nexperia is a global leader in high-performance discrete, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and focused on automotive, industrial, computing, and consumer markets.

The 74ABT543APW,118 belongs to Nexperia's ABT-series advanced BiCMOS logic family, engineered for high-speed, high-drive bidirectional bus interfacing in noise-immune industrial and computing systems.

FAQ

What is the maximum clock frequency supported by the 74ABT543APW,118 for reliable latch operation?

The 74ABT543APW,118 does not operate on a clock signal - it uses edge-triggered latch enables (LEAB/LEBA). Its minimum latch enable pulse width is 3.5 ns, supporting effective data capture rates up to 285 MHz in ideal conditions. Real-world maximum usable frequency depends on system-level setup/hold timing, load capacitance, and signal integrity; for 50 pF loads and 5 V supply, reliable operation is confirmed to 100 MHz with proper PCB layout. The 74ABT543APW,118 datasheet specifies tWL ≥ 3.5 ns at VCC = 5.0 V.

Does the 74ABT543APW,118 support live insertion in powered backplanes?

Yes, the 74ABT543APW,118 supports live insertion and extraction per its datasheet features. It includes input clamping diodes (VIK = −1.2 V), power-up 3-state behavior, and controlled ICC during power ramp-up. These features prevent bus contention and latch-up during hot-swap events. The 74ABT543APW,118 also meets JESD78B Class II Level A latch-up immunity (>500 mA), making it suitable for modular industrial backplanes requiring field-replaceable modules.

Can the 74ABT543APW,118 be used in a 3.3 V system?

No - the 74ABT543APW,118 is specified only for 4.5 V to 5.5 V operation. Its VIH minimum is 2.0 V, but DC characteristics (VOL, VOH, IOL) and AC timing (propagation delays, setup/hold) are guaranteed only within the 4.5–5.5 V range. Using it at 3.3 V risks undefined output states, excessive VOL, and timing violations. For 3.3 V systems, consider the pin-compatible 74LVT543PW instead. The 74ABT543APW,118 must be operated strictly within its recommended VCC range.

How does the 74ABT543APW,118 differ from the standard 74ABT245 transceiver?

The 74ABT543APW,118 integrates both transceiver and latch functionality - combining the roles of a 74ABT245 (octal bus transceiver) and a 74ABT373 (octal D-type latch) in one device. Unlike the 74ABT245, which offers only transparent bidirectional flow, the 74ABT543APW,118 provides independent latch-enable control per direction, enabling data staging, pipeline synchronization, and hold-mode operation. This eliminates interposer logic and reduces component count. The 74ABT543APW,118 also adds EAB/EBA enables for finer-grained path control.

What is the thermal resistance (θ_JA) of the 74ABT543APW,118 in TSSOP24 package?

The datasheet does not specify θ_JA for the 74ABT543APW,118 in SOT355-1 (TSSOP24) package. However, based on Nexperia's published thermal data for equivalent ABT-series TSSOP24 devices (e.g., 74ABT244APW), θ_JA is typically 120 °C/W on a 1-layer 1-in² copper pad. Maximum junction temperature remains 150 °C; with worst-case ICC = 250 µA and IOL = 64 mA at VOL = 0.55 V, power dissipation stays below 40 mW - well within safe thermal limits under standard PCB conditions. The 74ABT543APW,118 requires no heatsink in typical applications.

74ABT543APW,118 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: 74ABT

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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

74ABT543APW,118 FAQ

1.How can I place an order for 74ABT543APW,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74ABT543APW,118 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 74ABT543APW,118 reliable?

The price and inventory of 74ABT543APW,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT543APW,118 is usually 5 days.

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Once your 74ABT543APW,118 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 74ABT543APW,118?

For technical support, including 74ABT543APW,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT543APW,118 requirements.

6.How does Aetrix verify that 74ABT543APW,118 is sourced from the original manufacturer or authorized distributors?

All 74ABT543APW,118 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 74ABT543APW,118 meets industry standards.

7.What is the process for return or replacement of 74ABT543APW,118?

All 74ABT543APW,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT543APW,118, 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 74ABT543APW,118 part is unused and in its original packaging.

Return procedure for 74ABT543APW,118:

1.Submit a request within 90 days.

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

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