Nexperia USA Inc. 74HCT174DB,118

Overview

74HCT174DB,118 from Nexperia is a hex positive-edge-triggered D-type flip-flop with asynchronous master reset, designed for synchronous data latching in digital logic systems. It operates at 4.5 V to 5.5 V, delivers propagation delay as low as 18 ns (VCC = 5.0 V, CL = 15 pF), supports -40 °C to +125 °C industrial temperature range, and features TTL-compatible inputs for direct interfacing with legacy logic families. It is used in address register staging, control state storage, and parallel data capture in microcontroller peripheral interfaces.

For engineers reviewing the 74HCT174DB,118 datasheet, 74HCT174DB,118 pinout, 74HCT174DB,118 application, or 74HCT174DB,118 equivalent, key selection criteria include its 16-pin SO16 package, 5.0 V nominal supply compatibility, 18 ns typical tpd at 5 V/15 pF, asynchronous MR input behavior, and guaranteed operation across extended industrial temperature range without derating.

Technical Context

The 74HCT174DB,118 implements six independent edge-triggered D flip-flops sharing a common clock (CP) and active-low master reset (MR). Its TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5.0 V) ensure robust interfacing with 5 V bipolar logic while maintaining CMOS power efficiency.

Each flip-flop captures the Dn input on the LOW-to-HIGH transition of CP, provided setup (tsu = 16 ns min) and hold (th = 5 ns min) times are met. A LOW on MR forces all Qn outputs to LOW regardless of clock or data state - a fully asynchronous, non-clocked reset function critical for system initialization and fault recovery.

Key Specifications

Pinout & Package

74HCT174DB,118 is housed in a plastic small outline package (SO16) per SOT109-1, with 16 leads, 3.9 mm body width, and standard 1.27 mm lead pitch - compatible with automated PCB assembly and IPC-7351B footprint standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT174D,118, the 74HCT174DB,118 offers identical logic behavior in the same SO16 package - the 'B' suffix denotes tape-and-reel packaging per JEDEC standard, not functional variation. Versus SN74HCT174N, it provides superior high-frequency stability and smaller footprint but requires SMT assembly infrastructure.

Availability

74HCT174DB,118 is available at Aetrix Electronics and suitable for industrial PLC I/O registers, motor control state machines, microcontroller peripheral interfaces, and test equipment pattern generators requiring stable component supply across extended temperature ranges.

Supply support for 74HCT174DB,118 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 logic, analog, and discrete components optimized for efficiency and robustness in industrial, automotive, and consumer applications.

The 74HCT174DB,118 belongs to Nexperia's 74HCT logic family - engineered for TTL-compatible interfacing with CMOS power efficiency, targeting cost-sensitive, high-reliability digital control systems operating across harsh environmental conditions.

FAQ

What is the maximum clock frequency supported by the 74HCT174DB,118?

The 74HCT174DB,118 supports a maximum clock frequency of 69 MHz under recommended conditions (VCC = 5.0 V, CL = 15 pF, Tamb = -40 °C to +85 °C). At VCC = 4.5 V and CL = 50 pF, fmax drops to 24 MHz. These values derive directly from measured tpd and tW specifications in the official Nexperia datasheet Rev. 7.

Can the 74HCT174DB,118 operate reliably at 3.3 V supply?

No - the 74HCT174DB,118 is specified only for 4.5 V to 5.5 V operation. Its TTL-compatible input thresholds require minimum 2.0 V VIH, which cannot be guaranteed below 4.5 V supply. For 3.3 V systems, use the 74HC174 variant (CMOS input levels) or dedicated 3.3 V logic families like 74LVC174.

Is the master reset (MR) input truly asynchronous?

Yes - the MR input is fully asynchronous: asserting MR LOW immediately forces all Q outputs LOW within tPHL (max 53 ns at VCC = 4.5 V), independent of CP state or timing. This behavior is confirmed in the function table and dynamic characteristics section of the datasheet, with no clock dependency required for reset assertion or release.

Does the 74HCT174DB,118 have input clamp diodes, and how should they be used?

Yes - inputs include integrated clamp diodes to VCC and GND. When interfacing to voltages exceeding VCC (e.g., 12 V sensor signals), a series current-limiting resistor must be used to restrict IIK to ±20 mA maximum, as defined in the limiting values table. This protects the device while enabling robust overvoltage-tolerant input design.