Texas Instruments SN74LVTH2245PWR

Overview

SN74LVTH2245PWR from Texas Instruments is an octal bus transceiver IC designed for 3.3-V V_CC operation with mixed-mode 5-V input/output tolerance, enabling asynchronous bidirectional data transfer between A and B buses. It supports hot insertion via I_off and power-up 3-state, features bus-hold on all data inputs, and integrates 22-Ω series resistors on B-port outputs to suppress overshoot/undershoot - used in industrial backplane interfaces and legacy-to-modern voltage domain bridging.

For engineers reviewing the SN74LVTH2245PWR datasheet, SN74LVTH2245PWR pinout, SN74LVTH2245PWR application, or SN74LVTH2245PWR equivalent, key selection criteria include its 20-pin TSSOP package, 2.7–3.6-V supply range, ±12 mA B-port drive capability, bus-hold functionality eliminating external resistors, and support for unregulated battery operation down to 2.7 V.

Technical Context

This device implements dual-directional bus transceivers with independent direction (DIR) and output-enable (OE) control logic. Its TTL-compatible inputs accept 5-V signals while operating from a 3.3-V supply, and B-port outputs incorporate integrated 22-Ω series termination to reduce signal integrity issues without external components.

The SN74LVTH2245PWR includes active bus-hold circuitry on all A- and B-port data lines to maintain valid logic states on floating inputs, and features I_off protection that disables outputs during power-down to prevent current backflow - critical for hot-plug systems and mixed-voltage board-level integration.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 4.4 mm × 6.5 mm body, 0.65 mm lead pitch, 1.2 mm max height, exposed pad not present, 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 SN74LVC2245APW and SN74AVC2245PW, the SN74LVTH2245PWR uniquely combines 5-V tolerant inputs, integrated B-port 22-Ω termination, and bus-hold - making it optimal for retrofitting legacy 5-V systems with modern 3.3-V logic without redesigning signal conditioning.

Availability

SN74LVTH2245PWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system voltage translation, hot-swappable module communication, and low-power battery-powered data hubs requiring stable component supply and long-term manufacturability.

Supply support for SN74LVTH2245PWR 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 over 50 years of innovation in industrial, automotive, and communications markets.

The SN74LVTH2245PWR belongs to TI's LVTH logic family, engineered for mixed-voltage system interoperability - specifically targeting seamless integration between legacy 5-V infrastructure and next-generation 3.3-V digital systems.

FAQ

What is the maximum input voltage the SN74LVTH2245PWR can tolerate on its data pins?

The SN74LVTH2245PWR supports an input voltage range of −0.5 V to 7 V on all A- and B-port data inputs, allowing direct connection to 5-V TTL sources while operating from a 3.3-V supply. This eliminates external level-shifting circuitry in mixed-voltage designs and ensures compatibility with legacy peripherals without risk of damage.

Does the SN74LVTH2245PWR require external pullup or pulldown resistors on unused inputs?

No - the SN74LVTH2245PWR includes active bus-hold circuitry on all A- and B-port inputs, which maintains valid logic states on floating lines. Using external pullup or pulldown resistors with bus-hold is explicitly discouraged per the datasheet, as it may cause excessive current draw or logic instability.

Can the SN74LVTH2245PWR be used in hot-insertion applications?

Yes - the SN74LVTH2245PWR incorporates I_off and power-up 3-state features certified for hot-insertion use. When V_CC is 0 V, outputs are disabled to prevent back-current; during power-up/down, outputs remain in high-impedance until V_CC stabilizes above 1.5 V, avoiding bus conflicts in modular systems.

What is the purpose of the 22-Ω series resistors on the B-port outputs of the SN74LVTH2245PWR?

The B-port outputs of the SN74LVTH2245PWR integrate 22-Ω series resistors to dampen signal reflections and reduce overshoot/undershoot on PCB traces - particularly beneficial for medium-length interconnects (≤10 cm) in industrial backplanes. This eliminates the need for discrete termination resistors and improves signal integrity without additional layout effort.

What are the thermal characteristics of the SN74LVTH2245PWR in its TSSOP-20 package?

The SN74LVTH2245PWR in the TSSOP-20 (PW) package has a junction-to-ambient thermal resistance (θ_JA) of 83°C/W under standard JEDEC conditions. With typical ICC of 0.19 mA in disabled state and ≤5 mA under load, self-heating remains minimal - enabling reliable operation in sealed enclosures up to +85°C ambient without forced airflow.