Nexperia USA Inc. 74HCT574PW,118

Overview

74HCT574PW,118 from Nexperia is an 8-bit positive-edge-triggered D-type flip-flop with 3-state non-inverting outputs, designed for bus-oriented digital systems requiring synchronized data latching and controlled output enable. It operates at 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, and features TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) with 18 ns typical propagation delay (VCC = 4.5 V, CL = 50 pF). It is used in microcontroller peripheral interfacing, address/data bus buffering, and industrial control I/O expansion.

For engineers reviewing the 74HCT574PW,118 datasheet, 74HCT574PW,118 pinout, 74HCT574PW,118 application, or 74HCT574PW,118 equivalent, this device serves as a high-noise-immunity, low-power octal register for synchronous data capture and tri-state bus management in embedded and industrial logic designs - with confirmed timing parameters, thermal rating, and pin-validated TSSOP20 package compatibility.

Technical Context

The 74HCT574PW,118 implements eight independent D-type flip-flops sharing a common clock (CP) and active-low output enable (OE) input. Each flip-flop captures the logic state of its D-input on the LOW-to-HIGH CP transition, meeting 12 ns minimum setup time and 5 ns hold time at VCC = 4.5 V. OE controls all eight outputs simultaneously, placing them in high-impedance OFF-state without affecting internal latch states.

Its TTL-level inputs ensure direct compatibility with legacy 5 V logic families, while CMOS output stages deliver VOH ≥ 3.98 V (IO = −6 mA) and VOL ≤ 0.26 V (IO = 6 mA) under recommended conditions. Input clamping diodes allow safe interfacing to voltages exceeding VCC when current-limiting resistors are used.

Key Specifications

Pinout & Package

TSSOP20 plastic thin shrink small outline package (SOT360-1), 20-lead, 4.4 mm body width, 0.65 mm pitch - optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT574PWR and 74LCX574MTCX, the 74HCT574PW,118 offers superior thermal qualification (−40 °C to +125 °C), lower typical supply current (8 μA vs. 160 μA), and integrated input clamp diodes - making it the preferred choice for ruggedized industrial and long-lifecycle embedded deployments.

Availability

74HCT574PW,118 is available at Aetrix Electronics and suitable for microcontroller bus interface, industrial I/O expansion, memory address latching, and digital test equipment control requiring stable component supply across extended temperature ranges and high-volume production.

Supply support for 74HCT574PW,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 energy-efficient, robust components for industrial, automotive, and consumer markets.

The 74HCT574 belongs to Nexperia's 74HCT logic family, engineered specifically for seamless integration between legacy TTL systems and modern CMOS-based controllers - emphasizing noise immunity, wide supply tolerance, and extended temperature reliability.

FAQ

What is the maximum clock frequency supported by the 74HCT574PW,118?

The 74HCT574PW,118 supports a maximum clock frequency of 24 MHz at VCC = 4.5 V and CL = 50 pF, based on its 18 ns typical propagation delay and 16 ns minimum clock pulse width. At VCC = 5.0 V with CL = 15 pF, fmax increases to 76 MHz per datasheet Table 7 - but system-level timing margins must account for setup/hold times and board-level signal integrity.

Can the 74HCT574PW,118 operate with a 3.3 V supply?

No - the 74HCT574PW,118 is specified only for 4.5 V to 5.5 V operation per Table 5. Its TTL-compatible inputs require VIH ≥ 2.0 V, but VCC < 4.5 V violates recommended operating conditions and risks unreliable switching, increased propagation delay, and potential failure to meet timing specs. For 3.3 V systems, use 74LVC574 or 74ALVC574 instead.

How does the output enable (OE) pin behave during power-up?

The OE pin is active-low and has no internal pull-up; during power-up, its state is undefined until externally driven. To prevent bus contention, OE must be held HIGH (disabled) or actively pulled LOW only after VCC stabilizes and CP is held inactive. Nexperia recommends using a reset supervisor or RC network to ensure OE remains HIGH until system initialization completes.

Is the 74HCT574PW,118 pin-compatible with the 74HC574PW variant?

Yes - both share identical TSSOP20 (SOT360-1) pinout, footprint, and mechanical dimensions. However, the 74HC574PW uses CMOS input thresholds (VIH = 3.15 V min at VCC = 4.5 V), while the 74HCT574PW uses TTL thresholds (VIH = 2.0 V min). Swapping them requires verifying source driver compatibility to avoid marginal logic levels or increased static current.