Texas Instruments SN74LVCZ245ADBR

Overview

SN74LVCZ245ADBR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between 3.3-V and 5-V buses. It operates from 2.7 V to 3.6 V, accepts 5.5-V-tolerant inputs, delivers 6.3 ns max propagation delay at 3.3 V, and supports hot insertion via Ioff and power-up 3-state logic. It is used in mixed-voltage system interconnects such as industrial PLC backplanes and embedded processor memory expansion interfaces.

For engineers reviewing the SN74LVCZ245ADBR datasheet, SN74LVCZ245ADBR pinout, SN74LVCZ245ADBR application, or SN74LVCZ245ADBR equivalent, key selection criteria include 5-V input tolerance, guaranteed 3.3-V output swing, hot-swap capability, latch-up immunity (>100 mA), and SSOP-20 package compatibility with high-density PCB layouts.

Technical Context

The SN74LVCZ245ADBR implements dual-directional bus control using a single DIR input to select A→B or B→A data flow, while OE enables/disables all outputs into high-impedance state. Its Ioff circuitry blocks current backflow when powered down, and power-up 3-state ensures outputs remain tri-stated until VCC exceeds 1.5 V.

It supports mixed-mode signal operation: inputs tolerate 0–5.5 V regardless of VCC (2.7–3.6 V), enabling direct interfacing between legacy 5-V logic and modern 3.3-V microcontrollers. Output drive strength is ±24 mA at 3 V, with ground bounce (VOLP) <0.8 V and undershoot (VOHV) >2 V under typical conditions.

Key Specifications

Pinout & Package

SN74LVCZ245ADBR uses a 20-pin SSOP (DB) package with 0.65-mm lead pitch, 7.4-mm body width, and 2.0-mm maximum height. Pin 1 is located in quadrant Q1 per tape-and-reel orientation standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC245A, SN74LVCZ245ADBR adds 5-V input tolerance and Ioff for safer hot insertion; compared with 74ALVC16245, it offers smaller footprint and verified hot-swap support at the cost of half the bus width - making SN74LVCZ245ADBR optimal for 8-bit industrial interconnects where reliability and density are prioritized.

Availability

SN74LVCZ245ADBR is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded memory expansion interfaces, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LVCZ245ADBR 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 industrial-grade logic and interface solutions.

The SN74LVCZ245ADBR belongs to TI's LVCZ logic family, engineered specifically for robust mixed-voltage system interfacing in harsh industrial and automotive environments where voltage translation, hot-swap safety, and latch-up immunity are critical.

FAQ

What is the maximum input voltage the SN74LVCZ245ADBR can safely accept?

The SN74LVCZ245ADBR accepts input voltages from 0 V to 5.5 V on all A- and B-port pins, independent of VCC level. This 5-V tolerance allows direct connection to legacy 5-V logic families without external level-shifting components, provided VCC remains within its specified 2.7–3.6 V range. The absolute maximum rating for any input is 6.5 V, but operation above 5.5 V is not guaranteed or characterized.

Does the SN74LVCZ245ADBR support hot insertion, and how is it implemented?

Yes, the SN74LVCZ245ADBR supports hot insertion through two integrated features: Ioff circuitry disables outputs when VCC = 0 V to prevent damaging current backflow, and power-up 3-state logic holds all outputs in high-impedance until VCC exceeds 1.5 V. These functions are fully specified per JEDEC standards and eliminate bus contention during live board replacement - a key requirement in modular industrial systems using the SN74LVCZ245ADBR.

What is the propagation delay of the SN74LVCZ245ADBR at 3.3 V, and how does it impact timing budgets?

The SN74LVCZ245ADBR has a maximum propagation delay (tpd) of 6.3 ns at VCC = 3.3 V, measured from input transition to valid output transition under loaded conditions (CL = 30 pF). This value enables use in high-speed 100-MHz parallel bus systems with adequate setup/hold margin. The typical tpd is lower (≈1.5 ns), but design timing analysis must use the 6.3-ns worst-case figure to ensure robust operation across voltage, temperature, and process corners.

Can the SN74LVCZ245ADBR be used in a 5-V-only system?

No - the SN74LVCZ245ADBR is not rated for 5-V VCC operation. Its supply voltage must be strictly maintained between 2.7 V and 3.6 V. However, its inputs are 5.5-V tolerant, so it can safely receive signals from 5-V sources in a 3.3-V system. Using it with 5-V VCC would exceed absolute maximum ratings and risk permanent damage; for true 5-V systems, consider the SN74LS245 or SN74ALS245 instead of the SN74LVCZ245ADBR.

What package type and dimensions does the SN74LVCZ245ADBR use?

The SN74LVCZ245ADBR uses a 20-pin SSOP (Shrink Small Outline Package) with designation DB, measuring 7.4 mm × 5.3 mm × 2.0 mm max height and 0.65-mm lead pitch. Pin 1 is located in quadrant Q1 per JEDEC MO-150 standard. This compact, gull-wing package supports high-density PCB layouts and is compatible with standard reflow profiles (MSL Level-1, peak 260°C).