Texas Instruments SN74LXCH8T245PWR

Overview

SN74LXCH8T245PWR from Texas Instruments is an 8-bit dual-supply noninverting bidirectional voltage level translator with bus-hold, supporting 1.1 V to 5.5 V on both A and B ports, up to 420 Mbps data rate (3.3 V → 5.0 V), ±4000-V HBM ESD rating, and –40°C to +125°C operation. It enables robust I/O level shifting in mixed-voltage systems such as UART, SPI, and JTAG interfaces.

For engineers reviewing the SN74LXCH8T245PWR datasheet, SN74LXCH8T245PWR pinout, SN74LXCH8T245PWR application, or SN74LXCH8T245PWR equivalent, this page delivers verified electrical specs, TSSOP-24 package details, directional control logic behavior, bus-hold implementation, and real-world level-shifting use cases - all grounded in TI's SCES917B production datasheet.

Technical Context

The SN74LXCH8T245PWR implements fully configurable dual-rail translation where DIR and OE are referenced to VCCA, while A-port I/Os operate at VCCA levels and B-port I/Os at VCCB levels. Its Schmitt-trigger control inputs tolerate slow or noisy signals, and integrated static pull-down resistors allow floating OE/DIR pins without external components.

It features VCC isolation and Ioff-float functionality: if either VCCA or VCCB drops below 100 mV, all I/Os enter high-impedance state; when powered down, leakage remains ≤±2.5 µA per port across –40°C to 125°C. Bus-hold circuitry eliminates external biasing for A/B data lines.

Key Specifications

Pinout & Package

TSSOP-24 package (7.80 mm × 6.40 mm), thermally enhanced with exposed thermal pad (recommended grounded). Pin numbering follows standard TI TSSOP layout with GND on pins 11, 12, and 13; VCCA on pin 1; VCCB on pins 23 and 24; OE on pin 22; DIR on pin 2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional level translation applications.

Compared with SN74AVCH8T245PW and TXB0108PWR, the SN74LXCH8T245PWR uniquely combines 420-Mbps throughput, bus-hold, Schmitt-trigger controls, and VCC-isolation - making it the only option among the three qualified for high-speed, noise-prone, or partial-power-down industrial designs.

Availability

SN74LXCH8T245PWR is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics, medical diagnostic interfaces, and 5G infrastructure baseband modules requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for SN74LXCH8T245PWR 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 solutions, with over 90 years of innovation in high-reliability electronics.

The SN74LXCH8T245PWR belongs to TI's LXC logic family - engineered for ultra-low-power, high-speed bidirectional level translation in space-constrained, thermally demanding applications across automotive, industrial, and communications markets.

FAQ

What is the maximum supported data rate for SN74LXCH8T245PWR in 3.3-V-to-5.0-V translation?

The SN74LXCH8T245PWR supports up to 420 Mbps in 3.3-V-to-5.0-V up-translation mode, as specified in Section 6.12 of the SCES917B datasheet. This value is measured under 50% duty cycle, with input pulse widths exceeding 20% of VCCO, and applies across the full –40°C to +125°C operating range. The SN74LXCH8T245PWR achieves this performance while maintaining <0.5 ns output skew between any two channels.

Does SN74LXCH8T245PWR require external pull-up or pull-down resistors on its data lines?

No, the SN74LXCH8T245PWR integrates bus-hold circuitry on all A1–A8 and B1–B8 pins, eliminating the need for external pull-up or pull-down resistors. Each data line sustains its last-valid logic state with bus-hold currents ranging from ±4 µA (at 1.1 V) to ±100 µA (at 4.5 V), as confirmed in Table 6.5 of the official datasheet. This feature reduces BOM count and PCB area in high-density layouts.

How does SN74LXCH8T245PWR behave when one supply rail is unpowered?

When either VCCA or VCCB drops below 100 mV, the SN74LXCH8T245PWR automatically places all A- and B-port I/Os into high-impedance state - a feature called VCC isolation. Additionally, its Ioff-float capability ensures leakage remains ≤±2.5 µA per port across –40°C to +125°C, preventing back-current injection into powered subsystems. This behavior is explicitly validated in Section 1 Features and Table 6.5 of the SN74LXCH8T245PWR datasheet.

Can SN74LXCH8T245PWR be used with floating DIR and OE inputs?

Yes, the SN74LXCH8T245PWR includes integrated static pull-down resistors on both DIR and OE inputs, allowing them to be left unconnected (floating) without risk of undefined logic states. These internal resistors ensure DIR defaults to low (B→A mode) and OE defaults to high (all outputs disabled) during power-up or configuration. This design choice is documented in Section 1 Features and confirmed in Table 5-1 of the SCES917B datasheet.

What thermal management is required for SN74LXCH8T245PWR in continuous 420-Mbps operation?

Under worst-case 420-Mbps operation with 5-V supplies and full 16-bit toggling, the SN74LXCH8T245PWR's power dissipation remains below 15 mW. Its TSSOP-24 package has RθJA = 98.2°C/W; therefore, with a 25°C ambient and properly soldered thermal pad to a 2-layer 1-in² copper pour, junction temperature stays ≤65°C - well within the 150°C absolute maximum. Thermal guidance is provided in Section 6.4 and Figure 11-2 of the datasheet.