NXP Semiconductors 74HCT174N,652

Overview

74HCT174N,652 from Nexperia is a hex positive-edge-triggered D-type flip-flop with asynchronous master reset, operating at 4.5 V to 5.5 V supply voltage, delivering 21 ns typical propagation delay (CP to Q) at VCC = 4.5 V and CL = 50 pF, and supporting industrial temperature range from −40 °C to +125 °C. It functions as a synchronous data latch in digital control logic, bus interface timing, and state register stages of microcontroller peripherals.

For engineers reviewing the 74HCT174N,652 datasheet, 74HCT174N,652 pinout, 74HCT174N,652 application, or 74HCT174N,652 equivalent, this page delivers verified package mapping (SO16/SOT109-1), TTL-compatible input thresholds, six independent D-to-Q storage paths, and validated alternatives for logic-level translation and legacy 74-series upgrades.

Technical Context

The 74HCT174N,652 implements six identical edge-triggered D-type latches sharing one common clock (CP) and one active-low asynchronous master reset (MR). Each flip-flop samples its Dn input on the LOW-to-HIGH transition of CP and updates Qn within nanoseconds-no internal feedback or combinational logic is present.

All inputs accept TTL-level signals (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5 V–5.5 V), while outputs drive CMOS loads with VOH ≥ 3.98 V and VOL ≤ 0.26 V under 4 mA sink/source conditions. The device complies with JEDEC JESD7A and JESD8C standards and exhibits latch-up immunity exceeding 100 mA per JESD78 Class II Level B.

Key Specifications

Pinout & Package

74HCT174N,652 is supplied in SO16 plastic small outline package (SOT109-1), 16-pin, 3.9 mm body width, with standard 1.27 mm pitch and gull-wing leads. Pin 1 is marked by notch or bevel; device is lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT174N and 74HCT174PW,118, the 74HCT174N,652 uniquely combines SO16 mechanical compatibility, full −40 °C to +125 °C qualification, and Nexperia's enhanced ESD robustness-making it optimal for high-reliability industrial replacements where drop-in fit and extended temperature margin are mandatory.

Availability

74HCT174N,652 is available at Aetrix Electronics and suitable for programmable logic controllers, digital panel meters, microcontroller GPIO expansion, and legacy bus interface synchronization requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT174N,652 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 leading Dutch semiconductor manufacturer specializing in high-performance analog, logic, and discrete components, with global manufacturing and R&D centers focused on reliability and efficiency.

The 74HCT174N,652 belongs to Nexperia's 74HCT logic family-designed specifically for TTL-to-CMOS bridging in industrial control, automotive subsystems, and power management systems where robustness, wide temperature operation, and noise immunity are essential.

FAQ

What is the maximum clock frequency supported by the 74HCT174N,652?

The 74HCT174N,652 supports a maximum clock frequency of 24 MHz over the full −40 °C to +125 °C operating range (fmax = 24 MHz at VCC = 4.5 V, CL = 50 pF). At 25 °C and VCC = 4.5 V, typical fmax reaches 63 MHz. These values assume proper load capacitance, decoupling, and signal integrity-actual system-level timing must account for board-level propagation delays and setup/hold margins.

Does the 74HCT174N,652 require external pull-up resistors on its inputs?

No, the 74HCT174N,652 does not require external pull-up resistors on its inputs. Its TTL-compatible inputs have defined VIH (≥2.0 V) and VIL (≤0.8 V) thresholds and include internal clamp diodes that allow safe interfacing with current-limiting resistors when voltages exceed VCC. Pull-ups are only needed if floating inputs must be held HIGH in unconnected states-unused Dn or MR pins should be tied to VCC or GND respectively.

Can the 74HCT174N,652 be used with a 3.3 V microcontroller?

The 74HCT174N,652 is not recommended for direct interface with 3.3 V microcontrollers because its input thresholds are optimized for 5 V TTL (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and its minimum VCC is 4.5 V. Driving it from 3.3 V logic may cause unreliable recognition of HIGH inputs. For 3.3 V systems, use 74LVC174 or level-shifting circuitry-never operate the 74HCT174N,652 below 4.5 V.

What is the purpose of the MR (master reset) pin on the 74HCT174N,652?

The MR pin on the 74HCT174N,652 is an asynchronous active-LOW input that forces all six Qn outputs LOW immediately-regardless of clock state or data inputs. It provides deterministic initialization, fault recovery, or emergency clear functionality without waiting for a clock edge. To ensure reliable reset, MR must be held LOW for ≥5 ns (tW) before release, and released at least 3 ns before the next CP rising edge (trec).

Is the 74HCT174N,652 pin-compatible with the older 74HC174 series?

Yes, the 74HCT174N,652 is pin-compatible and functionally identical to the 74HC174 series in SO16 packaging, including identical pinout, terminal functions, and timing behavior. However, the 74HCT174N,652 uses TTL-compatible inputs (VIH = 2.0 V min), whereas the 74HC174 requires CMOS-level inputs (VIH = 3.15 V min at VCC = 4.5 V)-making the HCT variant ideal for direct replacement in legacy 5 V TTL systems without redesign.