Nexperia USA Inc. 74HCT74D,652

Overview

74HCT74D,652 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 section, TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), propagation delay of 18 ns typical (VCC = 4.5 V, CL = 50 pF), and operation across -40 °C to +125 °C in SO14 (SOT108-1) package. It serves as a synchronous storage element in digital control logic, clock domain synchronization, and state machine sequencing.

For engineers reviewing the 74HCT74D,652 datasheet, 74HCT74D,652 pinout, 74HCT74D,652 application, or 74HCT74D,652 equivalent, key selection considerations include its TTL-level input compatibility, guaranteed 22 MHz maximum clock frequency at VCC = 4.5 V, 4 mA output drive capability, Schmitt-trigger clock input for noise immunity, and support for dual independent flip-flop channels with separate set/reset controls.

Technical Context

The device implements two identical edge-triggered D latches sharing no internal coupling-each has dedicated nD, nCP, nSD, nRD, nQ, and nQ̅ terminals. Clock triggering occurs exclusively on LOW-to-HIGH transitions, with setup time (tsu) of 15 ns and hold time (th) of 3 ns at VCC = 4.5 V, ensuring robust timing margin in synchronous designs.

Asynchronous nSD and nRD inputs override clock action when asserted LOW, forcing immediate nQ = HIGH or nQ = LOW respectively-both are active-low, level-sensitive, and operate independently per channel. Input clamping diodes enable safe interfacing to voltages beyond VCC when used with current-limiting resistors.

Key Specifications

Pinout & Package

74HCT74D,652 is housed in a plastic small outline package (SO14, SOT108-1) with 14 leads, 3.9 mm body width, and standard 1.27 mm lead pitch. Pin 1 is marked by a notch or dot; the package is RoHS-compliant and rated for reflow soldering per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT74DR and MC74HCT74ADG, the 74HCT74D,652 offers tighter static current spec (40 μA max), documented 125 °C operation with full dynamic characterization, and superior input hysteresis on the clock line-making it optimal for high-reliability, thermally constrained, or noise-prone environments.

Availability

74HCT74D,652 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, digital power supply sequencing, and test equipment pattern generation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT74D,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 global semiconductor expert delivering high-performance logic, analog, and discrete components optimized for efficiency, reliability, and manufacturability in high-volume applications.

The 74HCT74 series belongs to Nexperia's industry-standard logic portfolio, engineered specifically for seamless interoperability with legacy TTL systems while delivering CMOS power efficiency and robust noise immunity in automotive, industrial, and computing infrastructure.

FAQ

Is 74HCT74D,652 pin-compatible with 74HC74D?

Yes, 74HCT74D,652 and 74HC74D share identical pinout, package (SO14), and functional diagram. However, they differ in input voltage thresholds: 74HCT74D accepts TTL-level inputs (VIH ≥ 2.0 V), while 74HC74D requires CMOS-level inputs (VIH ≥ 3.15 V at VCC = 4.5 V). Swapping them may cause logic misreads in mixed-signal systems.

What is the minimum pulse width required on nSD or nRD for reliable reset/set?

The minimum active pulse width for nSD or nRD is 8 ns at VCC = 4.5 V, as specified in the tW parameter for asynchronous inputs. This ensures internal latch metastability is avoided and state change completes before the pulse ends. Shorter pulses risk incomplete assertion and unpredictable output behavior.

Can 74HCT74D,652 drive LED indicators directly?

No-its outputs are rated for ±4 mA at VCC = 4.5 V, insufficient to drive standard 2–20 mA LEDs. Direct connection risks violating output current limits and degrading VOL/VOH. Use a series current-limiting resistor with external transistor buffer or dedicated LED driver IC for indicator applications.

Does the Schmitt-trigger on nCP affect setup/hold timing requirements?

No-the Schmitt-trigger applies only to noise filtering on the clock input waveform and does not alter the defined setup (15 ns) or hold (3 ns) timing windows relative to the LOW-to-HIGH transition point. The trigger threshold remains fixed at VM = 1.3 V, and timing parameters are measured using that crossing point.