Nexperia USA Inc. 74HCT74DB,112

Overview

74HCT74DB,112 from Nexperia is a dual positive-edge-triggered D-type flip-flop with independent asynchronous set (nSD) and reset (nRD) inputs, complementary Q/nQ outputs per section, TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), 14-pin SO14 package (SOT108-1), and operation across -40 °C to +125 °C for industrial timing and data synchronization in microcontroller peripheral interfaces.

For engineers reviewing the 74HCT74DB,112 datasheet, 74HCT74DB,112 pinout, 74HCT74DB,112 application, or 74HCT74DB,112 equivalent, this device serves as a robust edge-triggered storage element in clock-domain crossing, debounce logic, and state machine sequencing where deterministic setup/hold timing (tsu = 15 ns, th = 3 ns at VCC = 4.5 V) and Schmitt-trigger clock tolerance are required.

Technical Context

The 74HCT74DB,112 implements two independent D-flip-flops sharing no internal coupling-each with dedicated nD, nCP, nSD, nRD, nQ, and nQ signals. Its TTL-level inputs enable direct interfacing with legacy 5 V logic families without level translation, while Schmitt-trigger action on nCP ensures reliable triggering even with slow-rising clock edges (Δt/ΔV down to 139 ns/V at VCC = 4.5 V).

Asynchronous nSD and nRD operate active-low with propagation delays as low as 18 ns (nSD → nQ) and 24 ns (nRD → nQ) at VCC = 4.5 V, enabling fast forced state initialization. The device supports dual-rail operation from 4.5 V to 5.5 V and exhibits symmetrical output drive (VOH ≥ 3.84 V, VOL ≤ 0.33 V at IO = ±4 mA), ensuring clean signal integrity in mixed-signal control paths.

Key Specifications

Pinout & Package

74HCT74DB,112 uses the SO14 (SOT108-1) plastic small outline package: 14-lead, 3.9 mm body width, 1.27 mm lead pitch, gull-wing leads, and JEDEC MS-012 compliant footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT74PW,118, the 74HCT74DB,112 offers easier hand-soldering and legacy board compatibility; versus SN74HCT74DR, it delivers superior high-temperature reliability for under-hood or enclosed industrial environments.

Availability

74HCT74DB,112 is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics modules, and test equipment requiring stable component supply with guaranteed long-term availability and traceable lot documentation.

Supply support for 74HCT74DB,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, analog, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in industrial and automotive systems.

The 74HCT74 series belongs to Nexperia's legacy logic portfolio designed specifically for robust, pin-compatible replacements of industry-standard 74-series functions in harsh-environment applications demanding wide temperature range and high noise immunity.

FAQ

What is the maximum clock frequency supported by 74HCT74DB,112?

The 74HCT74DB,112 achieves a maximum clock frequency of 22 MHz at VCC = 4.5 V and Tamb = 25 °C, based on tpd = 18 ns (max) and tW = 23 ns (min pulse width). At full industrial temperature range (-40 °C to +125 °C), fmax drops to 18 MHz due to increased propagation delay and reduced pulse width margins.

Can 74HCT74DB,112 be used with a 3.3 V supply?

No-74HCT74DB,112 is specified only for VCC = 4.5 V to 5.5 V. Its TTL-compatible inputs require VIH ≥ 2.0 V, but the internal CMOS structure is not characterized below 4.5 V; operation at 3.3 V may result in undefined output states, excessive ICC, or failure to meet timing specifications.

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

The Schmitt-trigger on nCP provides hysteresis (~0.3 V typical), allowing reliable edge detection even with slow-rising clock signals (e.g., from RC oscillators or long PCB traces). This prevents multiple triggering on noisy or slew-limited edges, eliminating false toggles that would corrupt stored data in synchronous systems.

Are the set and reset inputs truly asynchronous?

Yes-nSD and nRD are fully asynchronous, active-low inputs that force nQ = H or nQ = L immediately upon assertion, regardless of nCP state or timing. Their propagation delay (18–24 ns max) is independent of clock phase, enabling hard real-time state overrides in safety-critical control loops.