NXP Semiconductors 74LVC573ADB,118

Overview

74LVC573ADB,118 from Nexperia is an octal D-type transparent latch with 3-state outputs, latch enable (LE) and output enable (OE) controls, 1.2 V to 3.6 V supply operation, 5.5 V overvoltage-tolerant inputs/outputs, and Schmitt-trigger inputs for noise immunity - used in bus interface and level translation between 3.3 V and 5 V logic domains in industrial control backplanes.

For engineers reviewing the 74LVC573ADB,118 datasheet, 74LVC573ADB,118 pinout, 74LVC573ADB,118 application, or 74LVC573ADB,118 equivalent, this device serves as a bidirectional voltage-level translator with IOFF partial power-down protection, high-impedance 3-state outputs, and flow-through pinout for PCB routing efficiency in mixed-voltage digital systems.

Technical Context

The 74LVC573ADB,118 implements eight independent D-latches with synchronous transparent mode (LE HIGH) and latched storage (LE LOW), where data is captured on the HIGH-to-LOW transition of LE. Its OE input operates independently to place all Q outputs in high-impedance state without affecting internal latch states.

Schmitt-trigger inputs ensure robust operation with slow-rising/falling signals, while the IOFF circuit disables outputs when VCC = 0 V, preventing backflow current during partial power-down - critical for hot-swap and power-gated subsystems. It complies with JEDEC standards JESD8-7A, JESD8-5A, and JESD8-C/JESD36 across its full 1.2–3.6 V VCC range.

Key Specifications

Pinout & Package

74LVC573ADB,118 is packaged in SOT360-1 (TSSOP20), a 20-pin thin shrink small outline package with 0.65 mm pitch, 4.4 mm body width, and thermal-enhanced construction for improved power dissipation in dense layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC573APWR and 74LVCH16373ADGG, the 74LVC573ADB,118 uniquely combines IOFF protection, flow-through pinout, and guaranteed −40 °C to +125 °C operation in a compact TSSOP20 package - making it optimal for space-constrained, mixed-voltage industrial and automotive control designs requiring robust power sequencing.

Availability

74LVC573ADB,118 is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded microcontroller bus expansion, automotive body control modules, and ATE digital pattern generation requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for 74LVC573ADB,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 for industrial, automotive, and consumer markets.

The 74LVC573A series belongs to Nexperia's advanced low-voltage logic portfolio, designed specifically for robust voltage translation and bus interfacing in mixed-supply systems with stringent power sequencing and ESD requirements.

FAQ

What is the maximum input voltage the 74LVC573ADB,118 can tolerate when VCC = 0 V?

The device tolerates up to 5.5 V on any input pin (D0–D7, LE, OE) even when VCC = 0 V, thanks to integrated overvoltage protection diodes and IOFF circuitry that blocks backflow current. This enables safe hot-plug operation in systems where input signals may be present before power-up.

Does the 74LVC573ADB,118 support true bidirectional level translation?

No - it is unidirectional: data flows from D inputs to Q outputs only. However, its 5.5 V tolerant inputs and 3-state outputs allow it to serve as a level-translating latch in either direction within a bus architecture (e.g., 3.3 V MCU → 5 V peripheral or 5 V status read-back via OE-controlled tristate).

How does the Schmitt-trigger input improve noise immunity?

Schmitt-trigger inputs provide ≥0.5 V hysteresis between rising and falling thresholds, rejecting noise spikes smaller than this window. This prevents false triggering on slow-rising signals (e.g., from long PCB traces or RC-filtered control lines) and ensures clean latching even with marginal signal integrity.

Can the 74LVC573ADB,118 be used without external pull-up or pull-down resistors on OE and LE?

Yes - OE and LE have no internal weak pull-ups or pull-downs, but their logic thresholds are defined relative to VCC (VIH ≈ 0.65×VCC, VIL ≈ 0.35×VCC). Driving them directly from CMOS outputs (e.g., MCU GPIO) eliminates need for external resistors; floating inputs are not permitted and will cause undefined behavior.