Nexperia USA Inc. 74AHC74BQ,115

Overview

74AHC74BQ,115 from Nexperia is a dual positive-edge-triggered D-type flip-flop with asynchronous set (active LOW) and reset (active LOW), complementary Q/Q outputs, 14-terminal DHVQFN package, and operation up to 115 MHz at 5 V with 50 pF load. It serves as a synchronous storage element in clock-domain crossing, data latching, and state-machine control circuits within industrial microcontroller peripherals.

For engineers reviewing the 74AHC74BQ,115 datasheet, 74AHC74BQ,115 pinout, 74AHC74BQ,115 application, or 74AHC74BQ,115 equivalent, key selection criteria include propagation delay (≤9.5 ns at 5 V/50 pF), Schmitt-trigger clock input for noise immunity, TTL-compatible input thresholds (for AHCT variant), and thermal-enhanced DHVQFN-14 packaging for high-density PCB layouts.

Technical Context

This device implements two independent edge-triggered D flip-flops sharing no internal logic-each with dedicated D, CP, SD, RD, Q, and Q̅ terminals. Its asynchronous SD/RD inputs override clocked behavior and operate independently of CP timing, enabling immediate state initialization or clearing without clock synchronization.

The Schmitt-trigger action on all clock inputs ensures reliable triggering even with slow-rising or noisy clock edges (≤20 ns/V transition rate supported), while CMOS-level input compatibility (74AHC74) or TTL-level input compatibility (74AHCT74) defines voltage threshold behavior across supply ranges from 2.0 V to 5.5 V.

Key Specifications

Pinout & Package

DHVQFN14 (SOT762-1): 2.5 × 3.0 × 0.85 mm body, 14 copper terminals, no leads, exposed thermal pad (non-soldered by default), pin 1 index area marked.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT74BQ,115, the original part offers broader supply range and lower input threshold sensitivity, while SN74LVC74APWRE4 trades speed for lower voltage operation and reduced power - making each optimal for distinct voltage architecture and thermal constraints.

Availability

74AHC74BQ,115 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, medical infusion pump controllers, and test equipment digital pattern generators requiring stable component supply across extended temperature ranges.

Supply support for 74AHC74BQ,115 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 essential efficiency technologies - delivering high-performance, reliable standard products including logic, discrete, and MOSFET solutions.

The 74AHC series targets high-speed, low-power CMOS logic applications requiring robust noise immunity, wide supply range, and automotive-grade reliability - designed specifically for industrial control, automotive subsystems, and instrumentation where timing precision and thermal resilience are critical.

FAQ

What is the maximum operating frequency of the 74AHC74BQ,115 at 3.3 V?

At VCC = 3.0–3.6 V and CL = 50 pF, the 74AHC74BQ,115 achieves a maximum frequency of 75 MHz. This is specified in Table 7 of the datasheet under "fmax" for the 74AHC74 variant. Performance degrades at lower voltages due to increased propagation delay (tpd ≤15.0 ns at 3.3 V/50 pF).

Can the 74AHC74BQ,115 be used with a 2.5 V supply?

Yes - the 74AHC74BQ,115 is fully specified down to 2.0 V. At 2.5 V, VIH = 1.8 V min and VIL = 0.7 V max per Table 6, ensuring reliable switching. Propagation delay increases to ≤14.0 ns (CL = 50 pF), and fmax drops to approximately 45 MHz, but all DC and AC parameters remain guaranteed.

Is the exposed thermal pad on the DHVQFN package required to be soldered?

No - the exposed pad (pin 1 index area) has no electrical function and requires no solder connection. Per datasheet note, it may remain floating or be connected to GND if soldered, but thermal performance is maintained without soldering due to the package's intrinsic thermal resistance design (9.6 mW/K derating above 98 °C).

How does the Schmitt-trigger clock input improve system reliability?

The Schmitt-trigger action on CP inputs provides hysteresis (typically 0.3–0.5 V), allowing clean edge detection on slow-rising or noisy clock signals - such as those from mechanical switches, long PCB traces, or unbuffered oscillators. This eliminates false triggering and metastability without external RC filtering or dedicated clock conditioners.