Texas Instruments SN74LVTH543IPWREP

Overview

SN74LVTH543IPWREP from Texas Instruments is an octal transceiver with dual-directional D-type latches, designed for 3.3-V V_CC operation while supporting 5-V TTL-level inputs and outputs. It features independent A-to-B and B-to-A control (CEAB/LEAB/OEAB and CEBA/LEBA/OEBA), bus-hold on all data inputs, I_off and power-up 3-state for hot insertion, and operates from −40°C to 85°C in TSSOP-24 package.

For engineers reviewing the SN74LVTH543IPWREP datasheet, SN74LVTH543IPWREP pinout, SN74LVTH543IPWREP application, or SN74LVTH543IPWREP equivalent, this device serves as a robust level-shifting transceiver for mixed-voltage backplane and board-to-board communication where controlled bidirectional data flow, latch transparency, and undriven input stability are required.

Technical Context

The SN74LVTH543IPWREP implements two independent 8-bit latch registers with separate enable logic per direction: CEAB/LEAB/OEAB govern A-to-B flow, while CEBA/LEBA/OEBA control B-to-A flow. Each register supports transparent latch mode (LE low) and storage mode (LE rising edge), with 3-state outputs enabled only when both CE and OE are asserted low.

It integrates bus-hold circuitry on all A and B port inputs (±500 µA dynamic hold current at V_CC = 3.6 V), eliminates external pull resistors, and guarantees hot-insertion safety via I_off (±100 µA at V_CC = 0) and power-up 3-state behavior across 0–1.5 V V_CC ramp.

Key Specifications

Pinout & Package

TSSOP-24 (PW) package: 7.8 mm × 4.4 mm body, 0.65 mm pitch, lead-free NiPdAu finish, MSL Level-1 (260°C, unlimited reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVT543PWRE, the SN74LVTH543IPWREP delivers extended temperature operation, enhanced reliability qualification, and DMS support - critical for aerospace, defense, and infrastructure deployments. Against SN74LVTH16543DGGR, it offers half the channel count in a smaller, lower-cost package ideal for space-constrained 8-bit bridging.

Availability

SN74LVTH543IPWREP is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, and hot-swappable module interconnects requiring stable component supply across extended temperature and long lifecycle programs.

Supply support for SN74LVTH543IPWREP 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 connectivity technologies, with decades of experience in high-reliability logic and interface solutions.

The SN74LVTH543IPWREP belongs to TI's enhanced-product (EP) LVTH logic family, engineered for mission-critical applications demanding extended temperature operation, controlled baseline manufacturing, and DMS support in aerospace, defense, and industrial systems.

FAQ

What is the operating temperature range of the SN74LVTH543IPWREP?

The SN74LVTH543IPWREP is specified for continuous operation from −40°C to +85°C. This extended industrial temperature range is validated through JEDEC-qualified reliability testing including HAST, temperature cycling, and electromigration analysis - making it suitable for deployment in outdoor infrastructure, avionics, and ruggedized control systems where ambient conditions exceed commercial-grade limits.

Does the SN74LVTH543IPWREP support hot insertion, and how is it implemented?

Yes, the SN74LVTH543IPWREP supports hot insertion via two complementary mechanisms: I_off circuitry disables outputs when V_CC = 0 V (±100 µA leakage), preventing backdrive current, and power-up 3-state forces outputs into high-impedance during V_CC ramp (0–1.5 V). These features are integral to the SN74LVTH543IPWREP design and require no external components to ensure safe live-board connection.

Can the SN74LVTH543IPWREP interface directly between 3.3-V and 5-V logic systems?

Yes, the SN74LVTH543IPWREP is explicitly designed for mixed-mode operation: it accepts 5-V TTL inputs (VI up to 7 V) and drives 5-V TTL-compatible outputs while powered from a 3.3-V V_CC. This capability is inherent to the SN74LVTH543IPWREP's LVTH process and is verified across its full operating range - eliminating the need for external level-shifting ICs or resistor networks.

What is the purpose of bus-hold circuitry on the SN74LVTH543IPWREP, and how does it affect design?

The bus-hold circuitry on the SN74LVTH543IPWREP actively maintains valid logic states (high or low) on all A and B port inputs when left floating, drawing up to ±500 µA to override noise or leakage. This eliminates the need for external pullup/pulldown resistors - reducing component count, saving PCB area, and avoiding timing skew introduced by RC networks. Use of external resistors with the SN74LVTH543IPWREP is explicitly discouraged in the datasheet.

How many independent data paths does the SN74LVTH543IPWREP provide, and how are they controlled?

The SN74LVTH543IPWREP provides two fully independent 8-bit data paths: A-to-B and B-to-A. Each path has dedicated control inputs - CEAB/LEAB/OEAB for A-to-B, and CEBA/LEBA/OEBA for B-to-A - enabling simultaneous or asynchronous bidirectional operation. This architecture allows the SN74LVTH543IPWREP to serve as a flexible data bridge in shared-bus topologies without arbitration logic or external sequencing.