Texas Instruments SN74LVCZ245APW

Overview

SN74LVCZ245APW 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-used in mixed-voltage system interconnects such as industrial PLC backplanes and embedded processor I/O expansion.

For engineers reviewing the SN74LVCZ245APW datasheet, SN74LVCZ245APW pinout, SN74LVCZ245APW application, or SN74LVCZ245APW equivalent, key selection criteria include voltage translation capability (3.3-V VCC with 5-V input tolerance), guaranteed 3-state isolation during power sequencing, ground-bounce and undershoot performance (VOLP < 0.8 V, VOHV > 2 V), latch-up immunity (>100 mA per JESD 78 Class II), and TSSOP-20 package compatibility with high-density PCB layouts.

Technical Context

The SN74LVCZ245APW 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 simultaneously into high-impedance state. Its Ioff circuitry actively disables outputs when VCC = 0, preventing current backflow during hot insertion.

It features mixed-mode signal operation: all I/O ports tolerate 0–5.5 V inputs regardless of VCC (2.7–3.6 V), enabling seamless interfacing between legacy 5-V logic and modern 3.3-V microcontrollers. Power-up 3-state ensures outputs remain high-Z until VCC exceeds 1.5 V, eliminating bus contention during supply ramp-up.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.95 mm × 4.4 mm × 1.2 mm body, 0.65 mm lead pitch, exposed pad not electrically connected, RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC245APW and TXB0108PWR, the SN74LVCZ245APW uniquely combines 5.5-V input tolerance, ±24-mA drive, and Ioff-enabled hot insertion-making it the only option among the three qualified for robust, high-fanout mixed-voltage bus bridging in industrial and automotive environments.

Availability

SN74LVCZ245APW is available at Aetrix Electronics and suitable for industrial automation backplanes, embedded processor I/O expansion, and automotive body control modules requiring stable component supply across multi-year production cycles.

Supply support for SN74LVCZ245APW 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 SN74LVCZ245APW belongs to TI's LVCZ advanced CMOS logic family, engineered specifically for robust mixed-signal voltage translation and hot-pluggable system interconnects in industrial, automotive, and communications infrastructure.

FAQ

What is the maximum input voltage the SN74LVCZ245APW can tolerate on its I/O pins?

The SN74LVCZ245APW accepts input voltages up to 5.5 V on all A- and B-port pins, independent of VCC (2.7–3.6 V). This 5.5-V tolerance enables direct interfacing with 5-V TTL and CMOS logic families without external level-shifting circuitry. The absolute maximum rating remains –0.5 V to 6.5 V, but functional operation is specified up to 5.5 V per the recommended operating conditions table in the SCES275G datasheet.

Does the SN74LVCZ245APW support hot insertion, and how is it implemented?

Yes, the SN74LVCZ245APW supports hot insertion via two integrated features: Ioff circuitry disables outputs when VCC = 0 V, preventing damaging back-current flow, and power-up 3-state holds all outputs in high-impedance until VCC exceeds 1.5 V. These functions are explicitly verified per JEDEC standards and documented in the device's functional description and absolute maximum ratings sections of the SCES275G datasheet.

What is the propagation delay of the SN74LVCZ245APW at 3.3 V, and how does it impact timing-critical designs?

The SN74LVCZ245APW 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 spec ensures reliable operation in 100-MHz parallel bus systems where total round-trip delay budgets often require sub-10-ns per stage. The typical value is 1.5 ns, offering significant timing margin for hold-time-critical interfaces.

Can the SN74LVCZ245APW be used in a purely 3.3-V system without 5-V signals present?

Yes, the SN74LVCZ245APW functions fully in 3.3-V-only systems: its VCC range (2.7–3.6 V), input thresholds (VIH = 2.0 V, VIL = 0.8 V), and output drive (VOH ≥ 2.2 V, VOL ≤ 0.4 V at 12 mA) are all optimized for 3.3-V LVTTL/LVCMOS compatibility. The 5.5-V input tolerance remains inactive but harmless, and all timing, power, and DC specs apply identically whether or not 5-V signals are present.

What package type and thermal characteristics apply to the SN74LVCZ245APW?

The SN74LVCZ245APW uses the TSSOP-20 (PW) package: 6.95 mm × 4.4 mm × 1.2 mm body, 0.65 mm lead pitch, with θJA = 83°C/W. This thermal resistance implies a maximum power dissipation of ~150 mW at 85°C ambient before junction temperature exceeds 125°C. The package is RoHS-compliant, MSL Level-1 rated, and features NiPdAu lead finish for reliable solderability and long-term interconnect integrity.