Nexperia USA Inc. 74HCT574D,653

Overview

74HCT574D,653 from Nexperia is an 8-bit positive-edge-triggered D-type flip-flop with 3-state outputs, designed for bus-oriented digital systems requiring synchronized data latching and controlled output driving. It operates at 4.5 V to 5.5 V, features TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), delivers 6 mA output drive, and supports industrial temperature range (−40 °C to +125 °C) in SO20 package.

For engineers reviewing the 74HCT574D,653 datasheet, 74HCT574D,653 pinout, 74HCT574D,653 application, or 74HCT574D,653 equivalent, this device serves as a synchronous octal register with active-low 3-state enable-critical for bidirectional bus buffering, microcontroller I/O expansion, and address/data latch isolation in embedded control and industrial logic designs.

Technical Context

The 74HCT574D,653 implements eight independent D-type flip-flops sharing a common clock (CP) and active-low output enable (OE). Each flip-flop captures the logic state of its D-input on the LOW-to-HIGH CP transition, meeting setup time (tsu = 12 ns min at VCC = 4.5 V) and hold time (th = 5 ns min) requirements. OE operates independently of clocking-asserting OE HIGH places all Q0–Q7 outputs in high-impedance state without altering internal latch states.

Its TTL-level inputs ensure direct compatibility with legacy 5 V logic families, while CMOS output structure provides rail-to-rail swing (VOH ≥ 3.98 V, VOL ≤ 0.26 V at IO = ±6 mA) and low static current (ICC ≤ 8 μA typical). Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors.

Key Specifications

Pinout & Package

74HCT574D,653 is housed in a plastic small outline package (SO20, SOT163-1) with 20 leads, 7.5 mm body width, and gull-wing leads compatible with standard surface-mount reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT574D,653, the TSSOP variant offers superior density and thermal performance but demands tighter manufacturing controls, while the DIP version sacrifices reliability and timing precision for ease of manual handling-making the SO20 version optimal for volume industrial deployment.

Availability

74HCT574D,653 is available at Aetrix Electronics and suitable for industrial automation, embedded control, and test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for 74HCT574D,653 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 specializing in high-performance logic, analog, and MOSFET solutions, with manufacturing rooted in process excellence and automotive-grade quality standards.

The 74HCT series targets robust 5 V digital interfacing-designed specifically for seamless integration between legacy TTL systems and modern CMOS-based controllers in industrial and consumer applications.

FAQ

What is the maximum clock frequency supported by the 74HCT574D,653?

The 74HCT574D,653 supports a maximum clock frequency of 20 MHz at VCC = 4.5 V and CL = 50 pF, verified by propagation delay (tpd ≤ 50 ns max) and setup/hold timing margins. At 5 V and reduced load (CL = 15 pF), fmax reaches 76 MHz per datasheet Table 7, but system-level timing must account for board trace capacitance and driver strength.

Can the 74HCT574D,653 operate at 3.3 V supply?

No-the 74HCT574D,653 is specified only for 4.5 V to 5.5 V operation per Table 5. Its TTL-compatible inputs require VIH ≥ 2.0 V, which is met at 3.3 V, but output drive strength, noise margins, and AC characteristics are not characterized below 4.5 V. For 3.3 V systems, use the 74LVC574 or 74ALVC574 instead.

How does the 3-state output behavior interact with the clock input?

The OE input operates entirely independently of CP: asserting OE HIGH places Q0–Q7 in high-impedance state regardless of CP activity or internal latch state. Clock edges continue to update internal flip-flops, but outputs remain disabled until OE returns LOW-enabling safe bus sharing without data corruption.

Is the SO20 package RoHS-compliant and lead-free?

Yes-74HCT574D,653 in SOT163-1 (SO20) package complies with RoHS Directive 2011/65/EU and is lead-free, with matte tin (Sn) termination finish. The device meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1, allowing unlimited floor life at ≤30 °C/85% RH.