Texas Instruments SN74LVCH245ADBRE4

Overview

SN74LVCH245ADBRE4 from Texas Instruments is an octal bus transceiver with tri-state outputs, designed for bidirectional data flow between 1.65-V to 3.6-V logic buses. It supports mixed-voltage operation (5-V inputs tolerated at 3.3-V V_CC), features I_off for live insertion and partial-power-down protection, 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 SN74LVCH245ADBRE4 datasheet, SN74LVCH245ADBRE4 pinout, SN74LVCH245ADBRE4 application, or SN74LVCH245ADBRE4 equivalent, key selection criteria include its 20-pin SSOP package, bus-hold inputs eliminating external resistors, ±24 mA output drive capability at 3.0 V, and guaranteed operation from –40°C to +125°C across full V_CC range.

Technical Context

This device implements a dual-bus, direction-controlled transceiver architecture with independent A and B ports, where DIR selects data flow direction (A→B or B→A) and OE enables/disables all outputs in high-impedance state. Its CMOS input structure accepts 0–5.5 V signals regardless of V_CC, enabling voltage translation without external level shifters.

The integrated bus-hold circuit maintains valid logic states on floating A/B inputs without pullup/pulldown resistors, while I_off protection ensures <±10 µA leakage when V_CC = 0 V - critical for hot-swap backplane designs and modular computing systems requiring safe power sequencing.

Key Specifications

Pinout & Package

SN74LVCH245ADBRE4 uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65-mm lead pitch and 7.20 mm × 5.30 mm body size - compatible with standard surface-mount reflow profiles and automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC245A and 74AVC8T245, SN74LVCH245ADBRE4 uniquely combines bus-hold, I_off, and 5-V-tolerant inputs in a single 20-pin SSOP package - making it the only option for industrial hot-swap and mixed-voltage legacy integration without redesigning termination networks.

Availability

SN74LVCH245ADBRE4 is available at Aetrix Electronics and suitable for server motherboard design, industrial PLC backplane development, and wearable sensor hub integration requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVCH245ADBRE4 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 for industrial, automotive, and communications markets.

SN74LVCH245ADBRE4 belongs to TI's LVCH logic family - engineered for robust mixed-voltage interoperability and power-aware system design in space-constrained embedded platforms.

FAQ

What voltage levels can SN74LVCH245ADBRE4 safely interface between?

SN74LVCH245ADBRE4 accepts 0–5.5 V inputs while operating from 1.65–3.6 V V_CC, enabling direct connection between 5-V legacy peripherals and 3.3-V or 1.8-V microcontrollers. Its outputs swing rail-to-rail within V_CC, and the device maintains full functionality across the entire V_CC range - verified in TI's SCES008Q datasheet Section 6.3.

Does SN74LVCH245ADBRE4 require external pullup resistors on unused inputs?

No. SN74LVCH245ADBRE4 integrates active bus-hold circuitry on all A and B port inputs, which maintains the last valid logic state without external components. This feature eliminates the need for 10-kΩ pullup/pulldown resistors - confirmed in Section 8.3.2 of the official datasheet and validated by ±75 µA hold current at V_CC = 3.0 V.

How does SN74LVCH245ADBRE4 support hot-plug operation in modular systems?

SN74LVCH245ADBRE4 implements I_off protection, limiting input/output leakage to ±20 µA when V_CC = 0 V. This prevents damaging back-current during live insertion - a requirement for PCIe add-in cards and industrial I/O modules. The feature is tested per JESD78 and documented in Section 6.6 of the SN74LVCH245ADBRE4 datasheet.

What is the maximum data rate supported by SN74LVCH245ADBRE4?

With a maximum propagation delay of 6.3 ns at 3.3 V, SN74LVCH245ADBRE4 supports reliable operation up to 150 MHz in synchronous bus applications. Real-world throughput depends on load capacitance and PCB routing - TI specifies 50 pF test conditions in Section 6.9, and actual performance is validated using the load circuit in Figure 3 of the datasheet.

Is SN74LVCH245ADBRE4 pin-compatible with other TI octal transceivers?

SN74LVCH245ADBRE4 shares the same 20-pin SSOP footprint and pinout as SN74LVC245A and SN74LVTH245A, but functional differences exist: SN74LVCH245ADBRE4 adds bus-hold and I_off, while SN74LVTH245A uses TTL-compatible thresholds. Direct substitution requires verification of these features in the target application - detailed in TI's "Logic Guide" literature SPRU677.