NXP Semiconductors 74HC74DB,112

Overview

74HC74DB,112 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 channel, 2.0–6.0 V supply range, and SO14 (SOT108-1) package. It stores data on LOW-to-HIGH clock transitions with 15 ns typical propagation delay at 4.5 V, Schmitt-trigger clock input for noise immunity, and operation from –40 °C to +125 °C - used in digital logic state storage, clock domain synchronization, and control sequencers.

For engineers reviewing the 74HC74DB,112 datasheet, 74HC74DB,112 pinout, 74HC74DB,112 application, or 74HC74DB,112 equivalent, this device serves as a foundational building block in synchronous logic design where deterministic edge-triggered state capture, robust noise tolerance, and dual-channel independence are required - especially in industrial control, instrumentation, and legacy TTL/CMOS interface bridging.

Technical Context

The 74HC74DB,112 implements two identical, electrically isolated D-type flip-flops in a single SO14 package. Each channel features fully asynchronous active-low set and reset, enabling immediate state forcing independent of clock timing. Its Schmitt-trigger clock input accepts slow-rising signals without metastability risk, while internal clamp diodes allow safe interfacing to voltages exceeding VCC via current-limiting resistors.

Functionally, it operates strictly on the LOW-to-HIGH transition of nCP: data present at nD and meeting setup/hold timing (15 ns su / 3 ns h at 4.5 V) is latched into the register and appears at nQ after tpd (17 ns typ). The function table confirms priority of nSD/nRD over clocked data, with no race condition between set and reset due to synchronous evaluation only during valid clock edges.

Key Specifications

Pinout & Package

74HC74DB,112 uses the SO14 (SOT108-1) plastic small outline package: 14-pin, 3.9 mm body width, 1.27 mm lead pitch, gull-wing leads, JEDEC MS-012 compliant. Pin 1 index located at top-left corner with beveled edge marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC74DB,112, the 74HCT74DB,112 offers guaranteed TTL input compatibility at 5 V but sacrifices some noise margin at lower VCC, while the SN74LVC74APWR delivers superior speed and efficiency in 3.3 V domains but forfeits voltage flexibility and industrial temperature support.

Availability

74HC74DB,112 is available at Aetrix Electronics and suitable for industrial control sequencing, digital signal edge detection, and legacy system interface bridging requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC74DB,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 focused on high-volume, high-reliability logic, analog, and MOSFET solutions - delivering robust, automotive-qualified components with stringent quality and longevity standards.

The 74HC74DB,112 belongs to Nexperia's 74HC logic family, engineered for universal compatibility across CMOS systems requiring low-power, wide-VCC operation and industrial-grade reliability in space-constrained packages.

FAQ

What is the maximum clock frequency supported by 74HC74DB,112?

The 74HC74DB,112 supports up to 24 MHz maximum clock frequency at VCC = 4.5 V and Tamb = +125 °C, based on its 53 ns maximum propagation delay (tpd) and 20 ns minimum clock pulse width (tW). At 6.0 V and 25 °C, fmax reaches 82 MHz, but system-level timing margins must account for PCB trace delays and load capacitance.

Can 74HC74DB,112 interface directly with 5 V TTL outputs?

No - the 74HC74DB,112 has CMOS-level inputs (VIH ≥ 3.15 V at VCC = 4.5 V), which may not reliably recognize standard 5 V TTL outputs (VOH ≈ 2.4 V). For guaranteed compatibility, use the pin-compatible 74HCT74DB,112 variant, whose TTL-input thresholds (VIH = 2.0 V min) ensure correct recognition of 5 V TTL logic levels.

Does 74HC74DB,112 require external pull-up or pull-down resistors on unused inputs?

Yes - unused inputs (especially nSD, nRD, nCP, and nD) must be tied to VCC or GND via resistors (typically 10 kΩ) to prevent floating states that cause excessive ICC, erratic switching, or increased EMI. The datasheet explicitly warns against leaving inputs unconnected due to CMOS gate sensitivity and potential oscillation.

Is the SO14 package of 74HC74DB,112 RoHS-compliant and lead-free?

Yes - the 74HC74DB,112 in SOT108-1 (SO14) package is RoHS-compliant and lead-free, conforming to Nexperia's standard environmental specifications. The "112" suffix denotes tape-and-reel packaging per JEDEC J-STD-020 moisture sensitivity level 1, with no special handling required prior to reflow soldering.