Texas Instruments SN74LVTH245AIPWREP

Overview

SN74LVTH245AIPWREP from Texas Instruments is a radiation-hardened, enhanced-product 3.3-V ABT octal bus transceiver with 3-state outputs and bus-hold circuitry, designed for asynchronous bidirectional data transfer between 3.3-V and 5-V systems. It supports hot insertion via Ioff and power-up 3-state, operates from 2.7 V to 3.6 V, delivers ±64 mA output drive, and features <0.8 V typical output ground bounce at VCC = 3.3 V - ideal for mixed-voltage industrial backplane interfaces.

For engineers reviewing the SN74LVTH245AIPWREP datasheet, SN74LVTH245AIPWREP pinout, SN74LVTH245AIPWREP application, or SN74LVTH245AIPWREP equivalent, key selection criteria include its 20-pin TSSOP package, DIR/OE control logic, bus-hold input retention, Ioff-enabled hot-swap capability, and guaranteed operation across –40°C to 85°C for aerospace and defense subsystems.

Technical Context

This device implements an ABT (Advanced BiCMOS Technology) architecture optimized for low-voltage 3.3-V operation while maintaining TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V) and 5-V-tolerant I/O. Its dual-bus topology enables configurable directionality per channel using a single DIR signal, with independent 3-state control via OE.

The integrated bus-hold circuitry actively maintains valid logic levels on floating A/B inputs without external resistors, and the Ioff specification (±100 µA at VCC = 0) ensures no backflow current during partial power-down - critical for live-insertion in modular avionics racks and telecom line cards.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.5 mm × 4.4 mm footprint, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVTH245AIPWREP, SN74LVC245AQPWRQ1 trades radiation hardening and bus-hold for automotive compliance, while SN74LVCH245AIPWREP adds Schmitt-trigger inputs but omits Ioff - making SN74LVTH245AIPWREP uniquely suited for high-reliability, mixed-voltage, hot-pluggable systems.

Availability

SN74LVTH245AIPWREP is available at Aetrix Electronics and suitable for industrial backplane interfaces, aerospace data bus bridges, defense radar chassis, secure communications modules, and radiation-tolerant embedded systems requiring stable component supply across extended temperature ranges and long lifecycle commitments.

Supply support for SN74LVTH245AIPWREP 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 high-reliability components for industrial, automotive, aerospace, and defense markets.

The SN74LVTH245A-EP product line delivers enhanced-product, radiation-tolerant logic devices engineered for mission-critical systems operating in extreme thermal, mechanical, and radiation environments.

FAQ

What is the maximum operating temperature range for SN74LVTH245AIPWREP?

The SN74LVTH245AIPWREP is rated for continuous operation from –40°C to +85°C. This industrial temperature range is validated per JEDEC standards and supported by TI's enhanced product qualification pedigree, including temperature cycling and biased 85/85 testing - confirming reliability in enclosed chassis and outdoor-mounted equipment where ambient temperatures exceed commercial-grade limits. The SN74LVTH245AIPWREP maintains full electrical specifications across this range without derating.

Does SN74LVTH245AIPWREP support hot insertion, and how is it implemented?

Yes, SN74LVTH245AIPWREP supports hot insertion through two complementary features: Ioff circuitry disables outputs when VCC = 0 V, limiting reverse current to ±100 µA, and power-up 3-state forces outputs into high-impedance during power ramp-up. These functions prevent bus contention and backflow damage when inserting or removing boards in live systems - a requirement verified in TI's enhanced product qualification for aerospace and telecom infrastructure applications.

Can SN74LVTH245AIPWREP interface directly between 3.3-V and 5-V logic domains?

Yes, SN74LVTH245AIPWREP supports mixed-mode signal operation: its inputs tolerate 5-V signals while powered from 3.3-V VCC, and its outputs drive 5-V TTL loads. This is enabled by ABT process design and confirmed by VI = 5.5 V absolute maximum rating and VIH = 2 V / VIL = 0.8 V thresholds - eliminating external level shifters in hybrid-voltage systems such as FPGA-to-ASIC interconnects or legacy controller upgrades.

What is the purpose of bus-hold circuitry in SN74LVTH245AIPWREP, and how does it affect system design?

The bus-hold circuitry in SN74LVTH245AIPWREP actively maintains the last-valid logic state on floating A/B inputs using ±750 µA dynamic current, preventing undefined states and reducing susceptibility to noise. This eliminates the need for external 10-kΩ pullup/pulldown resistors on unused data lines - simplifying PCB layout, lowering BOM cost, and improving signal integrity in modular backplanes where connectors may be partially mated during maintenance.

Is SN74LVTH245AIPWREP pin-compatible with other members of the SN74LVTH245A-EP family?

Yes, SN74LVTH245AIPWREP shares identical pinout, function mapping, and electrical behavior with SN74LVTH245AMDBREP (SSOP-20), differing only in package type (TSSOP vs. SSOP) and temperature grading (–40°C to 85°C vs. –55°C to 125°C). Both use the same LH245AEP top-side marking and support identical DIR/OE control logic, enabling drop-in substitution where board space and thermal constraints permit.