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NXP Semiconductors 74ABT543ADB,118
- Part No.:
- 74ABT543ADB,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74ABT543ADB,118.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,518
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Product details
Overview
74ABT543ADB,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 at 4.5 V to 5.5 V, delivers ±64 mA output drive, and achieves 4.5 ns max propagation delay (A↔B) at 5.0 V. It is used in bidirectional data bus isolation and buffering between microcontrollers and peripheral subsystems.
For engineers reviewing the 74ABT543ADB,118 datasheet, 74ABT543ADB,118 pinout, 74ABT543ADB,118 application, or 74ABT543ADB,118 equivalent, this page provides verified functional architecture, SSOP24 package mapping, latch timing constraints, 3-state enable behavior, and direct alternatives for bus interface redesign.
Technical Context
The 74ABT543ADB,118 implements 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. Its BiCMOS process enables simultaneous high-speed switching (sub-5 ns propagation) and robust DC output drive (64 mA sink, 32 mA source).
It supports live insertion/extraction and features power-up 3-state and power-up reset, ensuring defined I/O states during supply ramp. All inputs tolerate 5.5 V regardless of VCC, and outputs are specified for 5.5 V tolerance in OFF-state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 5.5 V - ensures compatibility with 5 V TTL/CMOS logic domains and stable operation across industrial temperature range. |
| Propagation delay (A↔B) | Max 4.5 ns at VCC = 5.0 V - enables reliable 200+ MHz bus handshaking in high-speed digital systems. |
| Output drive | 64 mA sink / 32 mA source - drives heavy capacitive loads (e.g., >10 pF per line) without signal degradation or timing skew. |
| Input voltage range | −1.2 V to +7.0 V - supports hot-swap, mixed-voltage interfacing, and overvoltage transient immunity on control pins. |
| Operating temperature | −40 °C to +85 °C - qualified for industrial-grade embedded control, instrumentation, and communications equipment. |
| ESD protection | HBM >2000 V, MM >200 V - reduces risk of field failure during handling and board-level assembly. |
| Latch-up immunity | Exceeds 500 mA per JESD78B Class II Level A - prevents destructive latch-up under transient overcurrent conditions. |
Pinout & Package
74ABT543ADB,118 is housed in a plastic shrink small outline package (SSOP24) with 24 leads, 0.65 mm pitch, and 5.3 mm body width (SOT340-1).
| 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 - enables synchronous capture of peripheral read data. |
| 2 (OEBA) | B-to-A output enable input | Active LOW; controls 3-state output drivers for A-side outputs - isolates A bus when disabled. |
| 3–10 (A0–A7) | A-side bidirectional I/O | Connects to microcontroller or CPU data bus; functions as input (when receiving from B) or output (when driving B). |
| 11 (EAB) | A-to-B enable input | Active LOW; enables transparent A-to-B path when LEAB and OEAB are also LOW - allows real-time forwarding without latching. |
| 12 (GND) | Ground reference | Primary return path for all internal logic and output current - must be low-impedance and decoupled near VCC pin. |
| 13 (OEAB) | A-to-B output enable input | Active LOW; enables/disables B-side outputs - critical for bus arbitration and multi-master conflict avoidance. |
| 14 (LEAB) | A-to-B latch enable input | Active LOW; latches A-side data into A-to-B register - synchronizes write operations to external peripherals. |
| 15–22 (B0–B7) | B-side bidirectional I/O | Connects to memory, FPGA, or peripheral device; direction controlled by EAB/LEAB/OEAB and EBA/LEBA/OEBA. |
| 23 (EBA) | B-to-A enable input | Active LOW; enables transparent B-to-A path - supports direct read-through mode from peripherals to host. |
| 24 (VCC) | Positive supply | +4.5 V to +5.5 V power rail; requires local 100 nF ceramic decoupling capacitor placed within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent latch banks | Enables concurrent A→B and B→A data staging - eliminates bus turnaround delays in full-duplex interfaces. |
| Separate LE/OE/E per direction | Allows asymmetric control: e.g., latch A→B while holding B→A in transparent mode - supports burst-mode transfers. |
| Power-up 3-state | Outputs remain high-impedance until VCC stabilizes - prevents bus contention during system power-on sequencing. |
| Live insertion/extraction support | Input clamping and robust ESD structure allow safe hot-plug operation in modular backplane or card-edge applications. |
| Back-to-back register architecture | Permits pipelined data flow: one bank latches while the other drives - essential for high-throughput DMA or FIFO bridging. |
Applications
| Microcontroller Bus Interface | FPGA-to-ASIC Data Bridge |
|---|---|
|
Use Scenario: Isolating and latching data between an ARM Cortex-M4 MCU and external SRAM or flash memory. IC Role / Device Role / Timing Role: Acts as bidirectional registered buffer with independent A→B (MCU→memory) and B→A (memory→MCU) paths, synchronized to MCU address strobes. Use Value: Eliminates timing closure issues caused by trace length mismatch; enables reliable 50 MHz parallel memory access without external glue logic. |
Use Scenario: Interfacing a Xilinx Artix-7 FPGA to a legacy ASIC with strict setup/hold requirements. IC Role / Device Role / Timing Role: Provides programmable latency insertion via latch enables, absorbing clock domain crossing jitter and skew. Use Value: Reduces FPGA timing closure effort by offloading setup/hold margin management to deterministic hardware latches. |
| Industrial I/O Module | Test Equipment Backplane |
|
Use Scenario: Managing bidirectional data flow between a PLC CPU and modular analog/digital I/O cards. IC Role / Device Role / Timing Role: Serves as hot-swappable bus transceiver with power-up 3-state and live-insertion capability. Use Value: Enables safe field replacement of I/O modules without powering down the entire controller rack. |
Use Scenario: Routing test signals between multiple instrument modules in a PXI or VXI chassis. IC Role / Device Role / Timing Role: Functions as reconfigurable data path selector with latch-controlled signal staging across shared backplane lines. Use Value: Allows precise synchronization of stimulus/response sequences across instruments using common clock and latch edges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latched transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVT543PW,118 | Lower drive (32 mA sink), 3.3 V only (VCC = 2.7–3.6 V), identical pinout and function | Suitable for 3.3 V systems only; not interoperable with 5 V buses without level translation | Select when migrating to lower-power 3.3 V designs and 5 V tolerance is unnecessary. |
| SN74ABT543DBR | Same logic function and specs; TI package (SSOP-24, PW package code) matches SOT340-1 footprint but differs in mold compound and marking | Drop-in PCB replacement in TI-design ecosystems; identical thermal and electrical behavior | Choose for supply chain diversification where TI sourcing is preferred and TI qualification documentation is required. |
Compared with 74ABT543ADB,118, the 74LVT543PW,118 reduces power and voltage compliance at the cost of 5 V interoperability, while the SN74ABT543DBR offers identical performance with alternate supply-chain validation - enabling design continuity across vendor transitions without layout change.
Availability
74ABT543ADB,118 is available at Aetrix Electronics and suitable for industrial I/O modules, FPGA interconnects, microcontroller expansion buses, and test equipment backplanes requiring stable component supply across extended product lifecycles.
Supply support for 74ABT543ADB,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 discrete, logic, and PowerMOS semiconductors, spun out from NXP's Standard Products division in 2017 and focused on automotive, industrial, computing, and consumer markets.
The 74ABT543ADB,118 belongs to Nexperia's ABT-series high-speed BiCMOS logic family, engineered for robust 5 V bus interfacing with low propagation delay, high noise immunity, and live-insertion reliability in demanding industrial environments.
FAQ
What is the maximum operating frequency supported by the 74ABT543ADB,118?
The 74ABT543ADB,118 does not specify a maximum clock frequency directly, but its 4.5 ns maximum propagation delay (A↔B) at 5.0 V implies reliable operation up to approximately 200 MHz for simple bus handshaking. Actual system frequency depends on board layout, load capacitance, and setup/hold margins - design validation is required for >100 MHz applications. The 74ABT543ADB,118 is optimized for burst-mode and strobe-driven interfaces rather than continuous clocked operation.
Does the 74ABT543ADB,118 support hot-swap or live insertion?
Yes, the 74ABT543ADB,118 explicitly supports live insertion and extraction per its datasheet features. This is enabled by its power-up 3-state behavior, robust input clamping (−1.2 V to +7.0 V), and high latch-up immunity (>500 mA). These characteristics prevent bus contention and damage during module replacement in powered-backplane systems. The 74ABT543ADB,118 is commonly deployed in industrial I/O racks and test equipment where hot-swap capability is mandatory.
How does the 74ABT543ADB,118 differ from the standard 74ABT245 or 74ABT373?
The 74ABT543ADB,118 integrates both 74ABT245 (octal transceiver) and 74ABT373 (octal D-latch) functionality into a single device, with separate control for A→B and B→A paths. Unlike the unidirectional 74ABT245 or single-direction 74ABT373, the 74ABT543ADB,118 provides back-to-back latches and independent LE/OE/E enables per direction - enabling true full-duplex staging without external logic. This reduces component count and PCB area in bidirectional bus architectures.
What are the absolute maximum ratings for VCC and input voltage on the 74ABT543ADB,118?
The 74ABT543ADB,118 has an absolute maximum VCC rating of −0.5 V to +7.0 V and an absolute maximum input voltage (VI) of −1.2 V to +7.0 V, regardless of VCC level. These ratings permit safe operation during power sequencing, transient overvoltage events, and mixed-voltage interfacing. However, recommended operating conditions restrict VCC to 4.5 V–5.5 V and VI to 0 V–VCC for reliable logic functionality. Exceeding recommended conditions may cause timing violations or increased leakage but will not immediately damage the 74ABT543ADB,118 if current limits are observed.
Is the 74ABT543ADB,118 pin-compatible with other packages in the 74ABT543A family?
Yes, the 74ABT543ADB,118 (SSOP24/SOT340-1) shares identical pin numbering and function with the SO24 (74ABT543AD, SOT137-1) and TSSOP24 (74ABT543APW, SOT355-1) variants. All three packages use the same 24-pin assignment per Table 2 in the datasheet. Mechanical differences (body width, pitch, height) require separate footprints, but logic design, schematic symbol, and netlist remain fully interchangeable across the 74ABT543A family.
74ABT543ADB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- Package/Case:
- 24-SSOP (0.209", 5.30mm 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-SSOP
74ABT543ADB,118 FAQ
1.How can I place an order for 74ABT543ADB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT543ADB,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 74ABT543ADB,118 reliable?
The price and inventory of 74ABT543ADB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT543ADB,118 is usually 5 days.
3.What payment methods are accepted for 74ABT543ADB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT543ADB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT543ADB,118?
74ABT543ADB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT543ADB,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 74ABT543ADB,118?
For technical support, including 74ABT543ADB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT543ADB,118 requirements.
6.How does Aetrix verify that 74ABT543ADB,118 is sourced from the original manufacturer or authorized distributors?
All 74ABT543ADB,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 74ABT543ADB,118 meets industry standards.
7.What is the process for return or replacement of 74ABT543ADB,118?
All 74ABT543ADB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT543ADB,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 74ABT543ADB,118 part is unused and in its original packaging.
Return procedure for 74ABT543ADB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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