Nexperia USA Inc. 74LVT573D,118

Overview

74LVT573D,118 from Nexperia is an 8-bit 3.3 V D-type transparent latch with 3-state outputs, latch enable (LE) and output enable (OE) controls, bus-hold inputs, and overvoltage-tolerant inputs up to 5.5 V - used for bidirectional data latching and bus isolation in 3.3 V microprocessor interfaces.

For engineers reviewing the 74LVT573D,118 datasheet, 74LVT573D,118 pinout, 74LVT573D,118 application, or 74LVT573D,118 equivalent, key selection criteria include 3-state timing (tPZH ≤ 5.7 ns), bus-hold current (IBHL = 75–150 μA), supply range (2.7–3.6 V), and SO20 package compatibility with legacy 5 V systems.

Technical Context

This BiCMOS octal latch operates in two distinct functional modes: transparent mode when LE is HIGH (Qn follows Dn), and latched mode when LE transitions LOW (data captured at setup time). OE independently controls high-impedance output state without affecting internal latch states.

Its bus-hold circuitry actively maintains unused D-input logic levels without external pull-ups, and IOFF protection enables live insertion/extraction by disabling leakage paths when VCC = 0 V. Input tolerance to 5.5 V allows safe interfacing with 5 V buses while powered from 3.3 V.

Key Specifications

Pinout & Package

74LVT573D,118 is housed in a plastic small outline package (SO20, SOT163-1) with 20 leads, 7.5 mm body width, and standard 1.27 mm lead pitch - compatible with automated PCB assembly and legacy socket footprints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVT573D,118, the 74LVC573APW,118 sacrifices 5 V bus compatibility for lower-voltage operation, while SN74LVTH573PW offers identical functionality in a different package with marginally slower timing - making the 74LVT573D,118 optimal for SO20-based industrial upgrades requiring 5 V tolerance and proven thermal reliability.

Availability

74LVT573D,118 is available at Aetrix Electronics and suitable for industrial PLC expansion, microprocessor bus interfacing, legacy system voltage translation, and test equipment signal conditioning requiring stable component supply across extended temperature ranges.

Supply support for 74LVT573D,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 high-volume, high-reliability logic, analog, and MOSFET solutions - delivering performance, efficiency, and scalability for industrial, automotive, and computing markets.

The 74LVT family delivers BiCMOS-enhanced speed and drive strength for 3.3 V systems interfacing with legacy 5 V infrastructure - designed specifically for robust bus-holding, hot-swap, and mixed-voltage interoperability in factory automation and embedded control.

FAQ

Can 74LVT573D,118 be used with a 5 V microcontroller data bus?

Yes - its inputs tolerate up to 5.5 V regardless of VCC, allowing direct connection to 5 V buses. Outputs swing rail-to-rail within the 2.7–3.6 V supply range, so external level shifting is required only if driving 5 V logic inputs. The device's bus-hold feature also stabilizes unconnected inputs without pull resistors.

What is the purpose of the IOFF circuitry in 74LVT573D,118?

IOFF disables I/O leakage paths when VCC = 0 V, limiting current to ±100 μA even with input/output voltages up to 4.5 V. This enables safe live insertion and extraction in powered backplane systems - critical for modular industrial controllers where modules must be swapped without shutting down the entire system.

How does bus-hold functionality eliminate external pull-up resistors?

Each D-input contains an active feedback circuit that sources or sinks ~100 μA to maintain the last-valid logic state when floating. At VI = 0.8 V, IBHL = 75–150 μA pulls toward LOW; at VI = 2.0 V, IBHH = −75 to −150 μA pulls toward HIGH - ensuring stable logic levels without discrete biasing components.

Is 74LVT573D,118 pin-compatible with older 74LS573 devices?

No - while both are octal transparent latches with LE/OE controls, 74LVT573D,118 uses BiCMOS technology for 3.3 V operation, 5.5 V tolerant inputs, and bus-hold, whereas 74LS573 is bipolar TTL operating at 5 V only. Pin functions match (D0–D7, Q0–Q7, LE, OE, GND, VCC), but voltage levels and timing are incompatible without level translation.