Nexperia USA Inc. 74HC73D,653

Overview

74HC73D,653 from Nexperia is a dual negative-edge-triggered JK flip-flop with asynchronous reset, designed for synchronous logic control in digital state machines and clock-domain interfacing. It operates across 2.0–6.0 V, delivers propagation delays as low as 15 ns at 6.0 V (CL = 50 pF), and features Schmitt-trigger clock inputs for robust noise immunity in industrial timing circuits.

For engineers reviewing the 74HC73D,653 datasheet, 74HC73D,653 pinout, 74HC73D,653 application, or 74HC73D,653 equivalent, this device is selected for precise edge-sensitive storage, reset-critical sequencing, and voltage-flexible TTL/CMOS interface bridging where deterministic toggle/set/reset behavior under asynchronous reset override is required.

Technical Context

The 74HC73D implements two independent JK flip-flops sharing no internal coupling-each with dedicated J, K, nCP (negative-edge clock), and nR (asynchronous active-LOW reset) terminals. Its Schmitt-trigger clock input accepts slow-rising signals (Δt/ΔV down to 83 ns/V at VCC = 6.0 V), enabling reliable operation with RC-generated clocks or noisy microcontroller outputs.

Functionally, it supports four modes per flip-flop: toggle (J=K=HIGH), set (J=HIGH/K=LOW), reset (J=LOW/K=HIGH), and hold (J=K=LOW), all conditioned on stable J/K inputs ≥14 ns before the HIGH-to-LOW clock transition at VCC = 6.0 V. The asynchronous nR input forces nQ = LOW / nQ = HIGH regardless of clock or data state.

Key Specifications

Pinout & Package

74HC73D,653 is housed in a 14-lead SO14 (SOT108-1) plastic small outline package, 3.9 mm body width, with standard JEDEC MS-012 footprint and gull-wing leads for reflow compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC73DR and 74HCT73D,653, the 74HC73D,653 provides optimal balance of low static current (40 μA max), wide VCC margin (2–6 V), and industrial temperature support - making it the default choice for new 3.3/5 V mixed-signal designs where ESD >2 kV suffices and TTL compatibility is unnecessary.

Availability

74HC73D,653 is available at Aetrix Electronics and suitable for industrial automation controllers, digital power management systems, and test instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC73D,653 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 specializing in high-performance, energy-efficient logic, analog, and discrete components for automotive, industrial, and consumer applications.

The 74HC73D belongs to Nexperia's 74HC logic family - engineered for low-power, high-noise-immunity digital interfacing and state retention in harsh electrical environments.

FAQ

Can 74HC73D,653 operate reliably at 2.0 V supply?

Yes. The device is fully specified from 2.0 V to 6.0 V, with guaranteed propagation delay ≤240 ns and set-up time ≤100 ns at 2.0 V. Output drive drops to ±2.5 mA, but remains sufficient for HC-load fan-out. All AC/DC parameters in Table 5 and Table 6 are validated across this full range.

Is the reset input truly asynchronous and level-sensitive?

Yes. Pins 2 and 6 (1R, 2R) are asynchronous active-LOW inputs. When pulled LOW, they force nQ = LOW and nQ = HIGH within 14 ns (min) at VCC = 6.0 V - independent of clock state or J/K values. This behavior is verified in Table 3 (Function table) and Fig. 8 (waveforms).

What is the maximum clock frequency supported at 3.3 V?

At VCC = 3.3 V and CL = 50 pF, the maximum operating frequency is 30 MHz (min) per flip-flop, derived from tpd ≤34 ns (max) in Table 7. With reduced load (CL = 15 pF), fmax reaches 77 MHz - confirmed in Table 7 footnote for VCC = 5.0 V and extrapolated per Δt/ΔV linearity.

Does 74HC73D,653 include input clamping diodes?

Yes. Section 1 states "Inputs include clamp diodes," and Table 4 lists IIK (input clamping current) ±20 mA. These diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors - a key feature for mixed-voltage signal routing and hot-swap protection.