Nexperia USA Inc. 74HC574D,653

Overview

74HC574D,653 from Nexperia is an 8-bit positive-edge-triggered D-type flip-flop with 3-state outputs in SO20 (SOT163-1) package, operating from 2.0 V to 6.0 V supply, featuring clock (CP) and active-low output enable (OE), and specified for -40 °C to +125 °C. It latches parallel data on rising CP edge and places outputs in high-impedance state when OE is HIGH-used in bus-hold register interfaces in industrial control I/O modules.

For engineers reviewing the 74HC574D,653 datasheet, 74HC574D,653 pinout, 74HC574D,653 application, or 74HC574D,653 equivalent, this device serves as a synchronous octal latch for bidirectional data buffering, address/data bus isolation, and microcontroller peripheral interfacing where low-power CMOS logic and 3-state bus control are required.

Technical Context

The 74HC574D implements eight independent D-type flip-flops sharing a common clock (CP) and active-low output enable (OE). Each flip-flop captures its D-input value on the LOW-to-HIGH transition of CP, meeting setup/hold times down to 2 ns at VCC = 4.5 V. OE operates asynchronously and does not affect internal state retention.

Input clamping diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. The device complies with JEDEC JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V), supports TTL-level inputs only in 74HCT variant, and delivers guaranteed VOH ≥ 4.4 V and VOL ≤ 0.26 V at VCC = 4.5 V and IO = ±6 mA.

Key Specifications

Pinout & Package

74HC574D,653 uses the SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads, JEDEC MS-013 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC574D,653, the 74HCT574D,653 offers TTL input thresholds for seamless integration with older logic families, while SN74HC574N provides through-hole mounting and extended cold-temperature capability-neither matches the SO20's thermal performance or surface-mount manufacturability.

Availability

74HC574D,653 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, microcontroller bus expansion, automotive body control units, and ATE pattern generation requiring stable component supply across extended temperature ranges.

Supply support for 74HC574D,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 delivering high-performance logic, discrete, and MOSFET solutions with focus on reliability, efficiency, and miniaturization for industrial and automotive markets.

The 74HC574 belongs to Nexperia's 74HC logic family-designed for low-power, wide-supply-voltage digital interfacing in space-constrained, thermally demanding embedded systems.

FAQ

What is the minimum clock pulse width required for reliable operation of 74HC574D,653?

The minimum HIGH and LOW pulse widths for CP are both 14 ns at VCC = 6.0 V, 16 ns at VCC = 4.5 V, and 80 ns at VCC = 2.0 V per datasheet Table 7. These values ensure proper triggering of the internal edge detector and avoid metastability. Pulse widths below these limits may cause skipped or double-triggered latching.

Can OE be toggled while CP is active without affecting stored data?

Yes. OE is asynchronous and does not interact with the flip-flop storage elements. Changing OE state only affects output driver impedance-Q0–Q7 retain their latched values regardless of OE transitions, even during ongoing clock activity. This allows dynamic bus arbitration without data corruption.

Does 74HC574D,653 support mixed-voltage interfacing (e.g., 3.3 V inputs with 5 V VCC)?

No. With VCC = 5 V, VIH(min) = 3.15 V and VIL(max) = 1.35 V per Table 6. A 3.3 V logic HIGH falls below the guaranteed VIH threshold, risking unreliable recognition. Use 74LVC574 or level translators for true 3.3 V ↔ 5 V interfacing.

What is the thermal resistance (R_θJA) of the SO20 package for 74HC574D,653?

The SO20 (SOT163-1) package has a typical R_θJA of 109 °C/W when mounted on a standard FR-4 PCB with 1 cm² copper pour per JEDEC JESD51-7. Derating begins above 109 °C ambient, with Ptot decreasing by 12.3 mW/K - critical for sustained 5 V/6 mA operation in enclosed enclosures.