Nexperia USA Inc. 74HCT74BZZ

Overview

74HCT74BZZ from Nexperia is a dual positive-edge-triggered D-type flip-flop with independent asynchronous set (nSD) and reset (nRD) inputs, complementary Q and Q̅ outputs per section, TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), 14-terminal DHXQFN package (2.0 × 2.0 × 0.48 mm), and operation across -40 °C to +125 °C for industrial timing and data synchronization in microcontroller peripheral interfaces.

For engineers reviewing the 74HCT74BZZ datasheet, 74HCT74BZZ pinout, 74HCT74BZZ application, or 74HCT74BZZ equivalent, this device supports precise edge-triggered state capture in clock-domain crossing, synchronous control logic, and dual-channel register storage where low-power CMOS performance and TTL-level compatibility are required.

Technical Context

The 74HCT74BZZ implements two independent D-type latches, each triggered on the LOW-to-HIGH transition of its dedicated clock input (nCP). Asynchronous nSD and nRD inputs override clocked behavior and force Q to HIGH or LOW respectively when asserted LOW, with propagation delays as low as 15 ns (tpd, VCC = 4.5 V, CL = 50 pF).

Schmitt-trigger action on clock inputs enhances noise immunity against slow-rising signals, while input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors - enabling robust integration into mixed-voltage digital systems.

Key Specifications

Pinout & Package

DHXQFN14 (SOT8014-1): leadless, 2.0 mm × 2.0 mm × 0.48 mm body, 0.4 mm pitch, 14 terminals, exposed thermal pad (non-soldered by default; may be floated or grounded).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT74PW and SN74HCT74DR, the 74HCT74BZZ delivers the smallest footprint and highest clock frequency among HCT74 variants, making it optimal for space-constrained, high-speed digital control where thermal management is handled via PCB layout rather than package size.

Availability

74HCT74BZZ is available at Aetrix Electronics and suitable for industrial PLC input latching, microcontroller GPIO expansion, digital audio bitstream synchronization, and motor control PWM edge alignment requiring stable component supply across extended temperature ranges.

Supply support for 74HCT74BZZ 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, reliable discrete, logic, and MOSFET solutions optimized for efficiency, miniaturization, and robustness in high-volume applications.

The 74HCT74BZZ belongs to Nexperia's 74HCT logic family, designed specifically for TTL-to-CMOS interfacing in industrial, automotive, and consumer systems where signal integrity, power efficiency, and small-form-factor packaging are essential.

FAQ

What is the minimum pulse width required on the clock input (nCP) for reliable operation?

The minimum clock pulse width (tW) for 74HCT74BZZ is 23 ns at VCC = 4.5 V, measured at the 10 %–90 % voltage points. This ensures sufficient time for internal metastability resolution and guarantees correct data capture on the rising edge. Pulse widths below this threshold risk setup/hold violations and unpredictable output states.

Can the 74HCT74BZZ operate reliably at 3.3 V supply?

No - the 74HCT74BZZ is specified only for VCC = 4.5 V to 5.5 V. At 3.3 V, input thresholds (VIH = 2.0 V min) remain valid, but output drive strength, propagation delay, and noise margins degrade outside guaranteed limits. For 3.3 V systems, use 74LVC74ABQ or 74AUP1G74 - not the HCT variant.

Is the exposed thermal pad on the SOT8014-1 package electrically connected?

No - the exposed pad (Pin 1 index area) has no internal electrical connection. Per Nexperia's datasheet, it may be left floating or connected to GND for thermal improvement, but must never be tied to VCC or any other voltage. Soldering it to GND improves θJA by ~15 °C/W but is optional.

How does the Schmitt-trigger action on nCP affect system-level timing analysis?

The Schmitt-trigger input raises effective hysteresis to ~0.4 V (typical), allowing reliable clocking even with slow rise times (≤120 ns at VCC = 2.0 V). This relaxes PCB trace impedance control requirements but does not alter tpd or setup/hold values - those remain referenced to the 50 % threshold point defined in Table 9 (VM = 1.3 V for HCT).