Texas Instruments SN74LVCH245ADGVRE4

Overview

SN74LVCH245ADGVRE4 from Texas Instruments is an octal bus transceiver with tri-state outputs, designed for bidirectional data translation between 1.65-V and 3.6-V logic domains. It supports mixed-mode operation (5-V-tolerant inputs with 3.3-V VCC), features bus-hold on all data inputs, Ioff for live insertion, and delivers 6.3 ns max propagation delay at 3.3 V - enabling use in high-speed server memory interfaces and PC chipset interconnects.

For engineers reviewing the SN74LVCH245ADGVRE4 datasheet, SN74LVCH245ADGVRE4 pinout, SN74LVCH245ADGVRE4 application, or SN74LVCH245ADGVRE4 equivalent, key selection criteria include its 1.65–3.6-V supply range, 5.5-V input tolerance, tri-state control via active-low OE and DIR, bus-hold functionality eliminating external resistors, and TVSOP-20 package compatibility with space-constrained embedded designs.

Technical Context

This device implements a dual-bus, direction-controllable transceiver architecture with independent A and B ports, each supporting eight I/O lines. Direction is controlled by the DIR input, while output enable/disable is managed by the active-low OE signal - both CMOS-compatible with rail-to-rail voltage thresholds across the full 1.65–3.6-V VCC range.

Its Ioff circuitry ensures isolation during partial power-down by disabling outputs when VCC = 0 V, preventing back-drive current. Bus-hold latches maintain valid logic states on floating A/B port inputs without external biasing, and input clamping diodes support robust 5.5-V tolerance regardless of VCC level.

Key Specifications

Pinout & Package

SN74LVCH245ADGVRE4 is packaged in a 20-pin TVSOP (Thin Very Small Outline Package) with 0.4-mm lead pitch and 5.00 mm × 4.40 mm body size - optimized for high-density PCB layouts in portable and networking equipment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC245A and 74ALVC245, SN74LVCH245ADGVRE4 uniquely combines 1.65-V operation, 5.5-V input tolerance, bus-hold, and Ioff - making it the only choice for thermally constrained, mixed-voltage, hot-pluggable systems requiring zero external bias components.

Availability

SN74LVCH245ADGVRE4 is available at Aetrix Electronics and suitable for server memory interconnects, PC chipset bridging, network switch fabric interfaces, and industrial PLC backplanes requiring stable component supply across extended temperature and voltage ranges.

Supply support for SN74LVCH245ADGVRE4 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 decades of expertise in logic interface ICs for industrial, computing, and communications markets.

SN74LVCH245ADGVRE4 belongs to TI's LVCH (Low-Voltage CMOS with Hold) logic family - engineered specifically for robust, low-power, mixed-voltage bus translation in space- and reliability-constrained embedded systems.

FAQ

What is the minimum operating voltage for SN74LVCH245ADGVRE4?

The SN74LVCH245ADGVRE4 operates down to 1.65 V VCC, as specified in the Recommended Operating Conditions table. This allows direct integration with modern low-voltage processors and FPGAs without intermediate regulation, while maintaining full 5.5-V input tolerance and bus-hold functionality across the entire range.

Does SN74LVCH245ADGVRE4 require external pull-up resistors on its A/B ports?

No - SN74LVCH245ADGVRE4 integrates bus-hold circuitry on all A1–A8 and B1–B8 inputs, actively maintaining valid logic states on floating lines. External pull-up or pull-down resistors are unnecessary and discouraged, as they conflict with the internal bus-hold current profile and may cause contention.

Can SN74LVCH245ADGVRE4 safely interface a 5-V microcontroller with a 1.8-V FPGA?

Yes - SN74LVCH245ADGVRE4 accepts 5-V inputs while operating at VCC = 1.8 V, and its outputs swing rail-to-rail between GND and 1.8 V. Direction control (DIR) and tri-state (OE) remain fully functional at 1.8 V, enabling reliable bidirectional translation without external level shifters.

What thermal metrics apply to SN74LVCH245ADGVRE4 in TVSOP-20 package?

For SN74LVCH245ADGVRE4 in TVSOP-20 (DGV), RθJA = 114.7°C/W and RθJB = 56.2°C/W per the Thermal Information table. These values assume JEDEC-standard PCB layout; actual junction temperature must stay below 150°C under worst-case load and ambient conditions.

Is SN74LVCH245ADGVRE4 compatible with hot-swap backplane systems?

Yes - SN74LVCH245ADGVRE4 includes Ioff circuitry that limits power-off leakage to ±10 µA when VCC = 0 V, preventing damaging back-current during live insertion. OE should be tied to VCC via a pullup resistor to ensure high-impedance state during power-up sequences.