NXP Semiconductors 74HC73N,652

Overview

74HC73N,652 from Nexperia is a dual negative-edge-triggered JK flip-flop with asynchronous reset, operating across 2.0 V to 6.0 V supply, featuring 14-pin SO14 (SOT108-1) package, Schmitt-trigger clock inputs for noise immunity, and guaranteed operation from –40 °C to +125 °C - used in synchronous logic control, state machines, and clock-domain synchronization circuits.

For engineers reviewing the 74HC73N,652 datasheet, 74HC73N,652 pinout, 74HC73N,652 application, or 74HC73N,652 equivalent, key selection criteria include negative-edge triggering behavior, asynchronous reset timing (t_pd ≤ 41 ns at V_CC = 6.0 V), input voltage thresholds (V_IL ≤ 1.8 V, V_IH ≥ 4.2 V at 6.0 V), output drive capability (±5.2 mA), and JEDEC-compliant ESD robustness (HBM > 2000 V).

Technical Context

The 74HC73N,652 implements two independent JK flip-flops sharing no internal coupling, each with separate J, K, clock (nCP), and asynchronous reset (nR) inputs plus complementary nQ/nQ outputs. Its negative-edge-triggered architecture requires stable J/K inputs one setup time (t_su ≥ 3 ns at 6.0 V) before the HIGH-to-LOW clock transition.

Schmitt-trigger action on nCP inputs enables reliable operation with slow-rising/falling clocks, while clamp diodes on all inputs permit interfacing to voltages exceeding V_CC when current-limiting resistors are used. The device complies with JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V) standards and supports industrial and extended temperature operation.

Key Specifications

Pinout & Package

74HC73N,652 is supplied in plastic small outline package (SO14), SOT108-1 variant: 14-lead, 3.9 mm body width, 1.27 mm lead pitch, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC73PW,118 and SN74HC73DR, the 74HC73N,652 offers the lowest propagation delay in SO14 packaging and highest ESD robustness (HBM >2000 V), making it optimal for noise-critical, space-constrained, and high-reliability applications where legacy SO14 compatibility is mandatory.

Availability

74HC73N,652 is available at Aetrix Electronics and suitable for industrial counter systems, digital power sequencing, programmable logic interface, and legacy bus glue logic requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 74HC73N,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, reliable logic, discrete, and MOSFET solutions with leadership in efficiency, miniaturization, and reliability.

The 74HC73N,652 belongs to Nexperia's 74HC logic family - engineered for low-power, high-noise-immunity digital control in industrial automation, power management, and legacy system modernization.

FAQ

What is the maximum clock frequency supported by the 74HC73N,652?

The 74HC73N,652 supports a maximum clock frequency of 35 MHz at V_CC = 6.0 V and CL = 50 pF. At lower supply voltages, the maximum frequency decreases - e.g., 6.0 MHz at V_CC = 2.0 V. This value is derived from the minimum clock pulse width (t_W) specification and verified across the full –40 °C to +125 °C operating range. The 74HC73N,652 datasheet confirms this in Table 7 under f_max.

Does the 74HC73N,652 have Schmitt-trigger inputs on all pins or only the clock?

Only the clock inputs (1CP and 2CP) feature Schmitt-trigger action in the 74HC73N,652. The J, K, and reset (nR) inputs are standard CMOS inputs without hysteresis. This is explicitly stated in Section 1 ("General description") of the Nexperia datasheet: "Schmitt-trigger action in the clock input makes the circuit highly tolerant to slower clock rise and fall times." The 74HC73N,652 pin description table confirms no Schmitt functionality is specified for other inputs.

Can the 74HC73N,652 operate reliably at 2.0 V supply voltage?

Yes, the 74HC73N,652 is fully specified for operation at 2.0 V, with validated parameters including propagation delay (≤240 ns), setup time (≥80 ns), and output drive (±4 mA). Its recommended operating conditions (Table 5) explicitly list V_CC = 2.0 V as the minimum, and static/dynamic characteristics tables provide measured values across this voltage. This makes the 74HC73N,652 suitable for single-cell Li-ion or 2xAA battery-powered logic subsystems.

What is the function of the clamp diodes in the 74HC73N,652 inputs?

The 74HC73N,652 includes input clamp diodes to protect against overvoltage transients. As described in Section 1, these diodes allow safe interfacing to signals exceeding V_CC - up to V_CC + 0.5 V - when used with external current-limiting resistors. This enables level-shifting without additional components, such as connecting a 5 V microcontroller GPIO to a 3.3 V 74HC73N,652 input. The clamp diodes are not intended for continuous conduction and require proper resistor sizing per datasheet guidelines.

Is the 74HC73N,652 pin-compatible with older 74LS73 devices?

No, the 74HC73N,652 is not pin-compatible with the bipolar 74LS73. While both are dual JK flip-flops with reset, the 74LS73 uses a different pinout: its reset inputs are active-HIGH and located on pins 4 and 11, whereas the 74HC73N,652 has active-LOW resets on pins 2 and 6. Additionally, the 74HC73N,652 places V_CC on pin 4 and GND on pin 11 - opposite to the 74LS73 (V_CC = pin 14, GND = pin 7). Direct replacement requires PCB modification; the 74HC73N,652 is a functional but not mechanical drop-in for 74LS73.