Nexperia USA Inc. 74LVT573DB,118

Overview

74LVT573DB,118 from Nexperia is a 3.3 V octal D-type transparent latch with 3-state outputs, designed for bus interfacing in high-speed digital systems. It features independent latch enable (LE, active HIGH) and output enable (OE, active LOW), bus hold inputs eliminating external pull-ups, and overvoltage-tolerant inputs up to 5.5 V - enabling direct TTL and 5 V system interfacing in industrial control backplanes.

For engineers reviewing the 74LVT573DB,118 datasheet, 74LVT573DB,118 pinout, 74LVT573DB,118 application, or 74LVT573DB,118 equivalent, key selection criteria include its 2.7–3.6 V supply range, sub-6 ns LE-to-Q propagation delay at 3.3 V, ±64 mA output drive, IOFF power-down capability, and SO20 (SOT163-1) package compatibility with legacy 74-series footprint layouts.

Technical Context

This BiCMOS device implements eight independent D-type latches with transparent mode when LE is HIGH and transparent-to-latched transition on LE HIGH-to-LOW edge. Its 3-state outputs are controlled solely by OE, with no effect on internal latch states - supporting bidirectional bus arbitration without data corruption.

Bus hold circuitry maintains valid logic levels on unused D inputs without external resistors, while IOFF protection ensures minimal leakage (<100 µA) when VCC = 0 V, enabling live insertion/extraction and partial power-down operation in mixed-voltage systems.

Key Specifications

Pinout & Package

74LVT573DB,118 is packaged in SO20 (SOT163-1): plastic small outline, 20-pin, 7.5 mm body width, 1.27 mm pitch - pin-compatible with industry-standard 74-series SOIC footprints.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal transparent latch applications.

Compared with SN74LVC573APWR, 74LVT573DB,118 delivers 2.7× higher output current and eliminates external biasing components; versus obsolete 74LVTH573PW, it maintains full pin-and-function compatibility while offering updated thermal performance and guaranteed long-term availability.

Availability

74LVT573DB,118 is available at Aetrix Electronics and suitable for industrial backplane interfaces, microcontroller bus expansion, automated test fixture control, and signal conditioning systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 74LVT573DB,118 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

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74LVT family targets high-speed, low-voltage bus interface applications - engineered for robustness in noisy industrial environments, with emphasis on voltage tolerance, ESD resilience, and thermal stability.

FAQ

What is the maximum clock frequency supported by 74LVT573DB,118?

The 74LVT573DB,118 does not operate on a clock signal - it is a transparent latch controlled by the LE (latch enable) input. Its usable data rate is determined by propagation delays: LE→Q max 5.6 ns at 3.6 V implies reliable operation up to ~150 MHz for latch-enable-triggered sampling, assuming proper setup/hold timing margins are maintained per datasheet Table 7.

Can 74LVT573DB,118 safely interface with 5 V logic without level shifters?

Yes - its inputs are overvoltage tolerant to 5.5 V, and outputs can drive 5 V TTL loads directly. When VCC = 3.3 V, VOH remains ≥2.0 V (min) at −32 mA, meeting TTL VIH minimum of 2.0 V. No level-shifting circuitry is required for bidirectional 3.3 V ↔ 5 V bus interfacing, provided OE and LE control signals are also 5.5 V-tolerant.

Does 74LVT573DB,118 require external pull-up resistors on unused D inputs?

No - the device integrates bus hold circuitry on all D0–D7 inputs, providing ±75 µA to ±150 µA active current to maintain valid logic states. This eliminates the need for external pull-up or pull-down resistors, reducing component count, PCB area, and potential signal integrity issues from unterminated stubs.

Is 74LVT573DB,118 suitable for hot-swap applications?

Yes - it supports live insertion and extraction per datasheet Section 2. The IOFF circuitry blocks current flow when VCC = 0 V, and bus hold inputs prevent undefined states during power ramp-up/down. Combined with ESD ratings exceeding 2000 V HBM, it meets requirements for hot-pluggable modules in telecom and industrial backplanes.