NXP Semiconductors 74LVC374AD,112

Overview

74LVC374AD from Nexperia is an octal positive-edge-triggered D-type flip-flop with 3-state outputs, designed for data latching and bus isolation in mixed-voltage digital systems. It operates from 1.2 V to 3.6 V supply, tolerates 5.5 V inputs/outputs, features IOFF partial power-down protection, and supports -40 °C to +125 °C industrial temperature range - used in FPGA I/O expansion, microcontroller peripheral interfacing, and level-translating data buses.

For engineers reviewing the 74LVC374AD datasheet, 74LVC374AD pinout, 74LVC374AD application, or 74LVC374AD equivalent, key selection criteria include its 5.5 V overvoltage-tolerant inputs, 3-state output control via active-low OE, 8-bit register synchronization on CP rising edge, and compatibility with both 3.3 V and 5 V logic domains without external level shifters.

Technical Context

This device implements eight independent D-type flip-flops sharing a common clock (CP) and output enable (OE) input. Each flip-flop captures Dn input state on the LOW-to-HIGH transition of CP, meeting set-up (2.0 ns min at VCC = 3.3 V) and hold (1.5 ns min) timing requirements. The OE signal controls all eight outputs simultaneously, placing them in high-impedance state without affecting internal register states.

Its IOFF circuitry disables outputs when VCC = 0 V, preventing backflow current during partial power-down - critical for hot-swap and power-gated subsystems. Schmitt-trigger inputs ensure robust operation with slow-rising signals, and JEDEC-compliant voltage thresholds support interoperability with TTL and CMOS families across 1.65 V–3.6 V supply ranges.

Key Specifications

Pinout & Package

74LVC374AD uses SO20 (SOT163-1) package: plastic small outline, 20 leads, 7.5 mm body width, 1.27 mm pitch. Pin 1 is index-marked; pin 10 = GND; pin 20 = VCC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop applications.

Compared with SN74LVC821APW, 74LVC374AD offers lower static current and no bus-hold overhead; versus 74LVCH16374ADGG, it provides minimal footprint and cost for 8-bit applications where byte granularity isn't needed.

Availability

74LVC374AD is available at Aetrix Electronics and suitable for industrial automation controllers, FPGA-based prototyping platforms, and mixed-voltage embedded gateways requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVC374AD 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, discrete, and MOSFET solutions - delivering energy-efficient, space-saving components for automotive, industrial, and consumer electronics.

The 74LVC series targets low-voltage, high-speed digital interfacing with robust mixed-voltage operation - engineered specifically for signal integrity and power efficiency in resource-constrained embedded systems.

FAQ

What is the maximum clock frequency supported by the 74LVC374AD?

The 74LVC374AD supports up to 150 MHz maximum clock frequency at VCC = 3.3 V and ambient temperatures ≤ +85 °C, and 120 MHz at -40 °C to +125 °C. This is determined by propagation delay (tpd ≤ 7.0 ns) and minimum pulse width (tW ≥ 3.0 ns) specifications under recommended operating conditions.

Can the 74LVC374AD safely interface a 5 V microcontroller with a 3.3 V FPGA?

Yes - its 5.5 V tolerant inputs accept 5 V logic levels while operating from a 3.3 V VCC supply, and its outputs swing rail-to-rail within the 3.3 V domain. No external level-shifting components are required, provided OE is actively controlled to prevent bus contention during power sequencing.

Does the 74LVC374AD support hot-swap or partial power-down operation?

Yes - its IOFF circuitry disables outputs when VCC = 0 V, limiting backflow current to ±10 μA max. This allows safe insertion/removal in live backplanes or power-gated subsystems, provided OE is held HIGH during power-off to maintain high-impedance state.

How does the Schmitt-trigger input improve noise immunity?

Schmitt-trigger inputs provide hysteresis (typically 0.3–0.5 V threshold separation), rejecting noise spikes smaller than the hysteresis window. This allows reliable operation with slow-rising signals (down to 10 ns/V) and eliminates false triggering on noisy industrial control lines without external RC filters.