Texas Instruments SN74LVTH2245PW

Overview

SN74LVTH2245PW from Texas Instruments is an octal bus transceiver designed for 3.3-V V_CC operation with mixed-mode 5-V input/output tolerance, supporting bidirectional data flow between A and B buses via DIR control and isolation via OE. It features bus-hold circuitry, 22-Ω integrated series resistors on B-port outputs, I_off for hot insertion, and operates from −40°C to 85°C in TSSOP-20 package.

For engineers reviewing the SN74LVTH2245PW datasheet, SN74LVTH2245PW pinout, SN74LVTH2245PW application, or SN74LVTH2245PW equivalent, key selection considerations include its 3.3-V core with 5-V tolerant I/O, ±12 mA B-port drive, 2.7–3.6 V supply range, bus-hold elimination of external resistors, and hot-swap capability enabled by I_off and power-up 3-state.

Technical Context

This device implements asynchronous bidirectional bus translation using two independent 8-bit data paths (A↔B), controlled by a single DIR input to select direction and an active-low OE input to enable/disable both ports simultaneously. The architecture integrates bus-hold on all data inputs and internal 22-Ω series termination on B-port outputs to suppress signal reflections without external components.

It supports unregulated battery operation down to 2.7 V and ensures safe hot insertion via I_off current limiting (<±100 µA at V_CC = 0) and power-up 3-state behavior that forces high-impedance outputs when V_CC is below 1.5 V - critical for backplane and modular system designs requiring live module replacement.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 4.4 mm × 6.5 mm body, 0.65 mm pitch, 1.2 mm max height, exposed pad not present, RoHS-compliant NiPdAu lead 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 SN74ALVCH162245DL, the SN74LVTH2245PW uniquely combines 5-V I/O tolerance, bus-hold, and hot-swap readiness in a compact 20-pin TSSOP - making it optimal for legacy interface bridging where reliability under voltage mismatch and field serviceability are mandatory.

Availability

SN74LVTH2245PW is available at Aetrix Electronics and suitable for industrial backplanes, legacy bus bridges, modular test equipment slots, and hot-swappable communication modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVTH2245PW 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 SN74LVTH2245PW belongs to TI's LVTH (Low-Voltage BiCMOS Technology with TTL compatibility) logic family, engineered specifically for robust mixed-voltage system interfacing in industrial, telecom, and instrumentation applications.

FAQ

What is the maximum operating temperature range for the SN74LVTH2245PW?

The SN74LVTH2245PW is rated for operation from −40°C to +85°C ambient temperature, as confirmed in the recommended operating conditions table of the SCBS707E datasheet. This industrial-grade temperature range supports deployment in harsh environments such as factory automation controllers and outdoor telecom equipment where thermal stability is critical. The TSSOP-PW package's θ_JA of 83°C/W further defines its thermal derating envelope under continuous load.

Does the SN74LVTH2245PW require external pullup or pulldown resistors on its data inputs?

No, the SN74LVTH2245PW does not require external pullup or pulldown resistors because it integrates active bus-hold circuitry on all A and B data inputs. As specified in the datasheet, this feature maintains unused or floating inputs at valid logic levels with ±75 µA hold current at V_CC = 3 V. Using external resistors with the bus-hold function is explicitly discouraged in the datasheet to avoid conflict and increased power consumption.

Can the SN74LVTH2245PW safely interface between a 3.3-V microcontroller and a 5-V peripheral?

Yes, the SN74LVTH2245PW is explicitly designed for this use case: it operates from a 3.3-V V_CC supply while accepting and driving 5-V logic signals on all I/O pins (VI and VO rated to 5.5 V). Its mixed-mode signal operation allows seamless bidirectional communication without external level shifters - a core specification highlighted in the device description and absolute maximum ratings of the SCBS707E datasheet.

What is the purpose of the 22-Ω series resistors on the B-port outputs of the SN74LVTH2245PW?

The 22-Ω series resistors integrated into the B-port outputs of the SN74LVTH2245PW serve to damp signal reflections and reduce overshoot/undershoot on transmission lines, especially in unterminated or stub-loaded bus configurations. As stated in the datasheet, this eliminates the need for external series termination components, simplifying layout and improving signal integrity in medium-speed parallel interfaces up to 33 MHz without requiring impedance-matched PCB traces.

Is the SN74LVTH2245PW suitable for hot-insertion applications?

Yes, the SN74LVTH2245PW is qualified for hot-insertion use via two complementary features: I_off circuitry limits current to ±100 µA when V_CC = 0, preventing damaging backflow into powered systems, and power-up 3-state ensures outputs remain high-impedance until V_CC exceeds 1.5 V. These capabilities are validated per JESD standards and explicitly cited in the datasheet's key features and functional description sections.