Nexperia USA Inc. 74AHCT574D,112

Overview

74AHCT574D,112 from Nexperia is an octal positive-edge-triggered D-type flip-flop with 3-state non-inverting outputs, designed for bus-oriented data latching in 5 V TTL-compatible systems. It features a single clock (CP) input, active-low output enable (OE), 8-bit parallel data storage, and operates across −40 °C to +125 °C. Its 20-pin SO20 package supports industrial control backplanes and microcontroller peripheral interfacing.

For engineers reviewing the 74AHCT574D,112 datasheet, 74AHCT574D,112 pinout, 74AHCT574D,112 application, or 74AHCT574D,112 equivalent, key selection criteria include TTL-level input compatibility (VIH = 2.0 V min), 3-state output timing (ten = 12.5 ns max at VCC = 5 V), propagation delay (tpd = 10.6 ns typ), and SO20 thermal derating (12.3 mW/K above 109 °C).

Technical Context

This device implements eight independent D-type latches synchronized on the LOW-to-HIGH transition of CP, with set-up time (tsu = 3.5 ns) and hold time (th = 1.5 ns) specified at VCC = 4.5–5.5 V and CL = 50 pF. OE controls output impedance without affecting internal state retention.

Input tolerance extends to 5.5 V regardless of VCC, enabling mixed-voltage translation between 3.3 V logic domains and 5 V buses. Schmitt-trigger inputs provide high noise immunity, and CMOS construction ensures low static current (ICC = 40 μA max at −40 °C to +125 °C).

Key Specifications

Pinout & Package

74AHCT574D,112 uses the SOT163-1 (SO20) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, with gull-wing leads and exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AHCT574N and 74LVC574APW, the 74AHCT574D,112 uniquely balances 5 V TTL interoperability, SO20 thermal performance, and industrial temperature support-making it optimal for retrofitting legacy 5 V control systems without redesigning power or layout.

Availability

74AHCT574D,112 is available at Aetrix Electronics and suitable for industrial PLC backplanes, microcontroller peripheral expansion, legacy bus isolation, and test equipment signal conditioning requiring stable component supply across extended temperature ranges.

Supply support for 74AHCT574D,112 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 delivering high-performance logic, discrete, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in high-volume applications.

The 74AHCT series targets industrial and automotive-adjacent systems requiring TTL-compatible 5 V logic with enhanced noise immunity, thermal resilience, and long-term supply stability-designed specifically for bus interface, data latching, and signal routing in harsh environments.

FAQ

Can 74AHCT574D,112 operate reliably at 4.5 V supply?

Yes. The 74AHCT574D,112 is fully specified from 4.5 V to 5.5 V per Table 5. At VCC = 4.5 V, it guarantees VIH ≥ 2.0 V, VOL ≤ 0.55 V at 8 mA, and tpd ≤ 13.5 ns with CL = 50 pF - meeting all timing and voltage thresholds for robust 5 V system integration.

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

Yes. The SOT163-1 package used in 74AHCT574D,112 is lead-free and complies with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Nexperia confirms full compliance in its material declarations and PPAP documentation.

What is the maximum clock frequency supported at 125 °C ambient?

At TA = +125 °C and VCC = 4.5–5.5 V, the minimum guaranteed fmax is 75 MHz (Table 7). This is validated with CL = 50 pF and accounts for worst-case propagation delay (tpd = 13.5 ns max) and pulse width (tW = 5.5 ns min), ensuring timing closure in thermally stressed environments.

Does OE assertion affect internal flip-flop state during power cycling?

No. As stated in Section 1, "Operation of the OE input does not affect the state of the flip-flops." Internal latches retain their last-clocked D-input values regardless of OE logic level, including during brown-out or partial power-down conditions - preserving data integrity across enable transitions.