Nexperia USA Inc. 74HC73DB,118

Overview

74HC73DB,118 from Nexperia is a dual negative-edge-triggered JK flip-flop with asynchronous reset, designed for synchronous logic control in digital systems. It features two independent flip-flops (FF1 and FF2), each with J, K, clock (nCP), and active-low reset (nR) inputs, plus complementary true (nQ) and complement (nQ) outputs. Operates across 2.0 V to 6.0 V supply, supports -40 °C to +125 °C ambient range, and delivers 32 ns typical propagation delay at 4.5 V.

For engineers reviewing the 74HC73DB,118 datasheet, 74HC73DB,118 pinout, 74HC73DB,118 application, or 74HC73DB,118 equivalent, key selection criteria include negative-edge clock triggering, asynchronous reset behavior, Schmitt-trigger clock input tolerance, and SO14 package compatibility with legacy 74HC logic layouts.

Technical Context

This device implements two independent edge-triggered JK flip-flops sharing no internal coupling-each responds solely to its dedicated nCP and nR signals. The Schmitt-trigger action on both clock inputs enables robust operation with slow-rising/falling edges, while clamp diodes allow safe interfacing to voltages exceeding VCC using current-limiting resistors.

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 synchronized to the HIGH-to-LOW clock transition. Asynchronous nR overrides clock and data, forcing nQ LOW and nQ HIGH regardless of timing conditions.

Key Specifications

Pinout & Package

74HC73DB,118 is supplied in SO14 (SOT108-1) plastic small outline package: 14-pin, 3.9 mm body width, 1.27 mm lead pitch, gull-wing leads, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC73DR, 74HC73DB,118 offers tighter VIH/VIL symmetry and broader industrial temperature validation; versus 74HCT73DB,118, it trades TTL input compatibility for lower static current and improved noise immunity in pure CMOS systems.

Availability

74HC73DB,118 is available at Aetrix Electronics and suitable for industrial automation controllers, test equipment signal conditioning, and legacy logic interface adapters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC73DB,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, discrete, and MOSFET solutions with emphasis on efficiency, miniaturization, and robustness for industrial and consumer applications.

The 74HC73 belongs to Nexperia's 74HC high-speed CMOS logic family, engineered for low-power, wide-supply digital control in space-constrained and thermally demanding environments.

FAQ

What is the minimum setup time required for J and K inputs before the clock edge?

The datasheet specifies a minimum setup time (t_su) of 3 ns at VCC = 4.5 V. This ensures predictable toggling, setting, or resetting behavior. At 2.0 V, t_su increases to 80 ns due to slower internal propagation; design must accommodate worst-case values across the full voltage and temperature range.

Can 74HC73DB,118 be operated at 3.3 V with guaranteed performance?

Yes - 3.3 V falls within the specified 2.0 V to 6.0 V supply range. At 3.3 V, typical propagation delay is ~40 ns and maximum clock frequency is ~24 MHz (per datasheet Table 7). VIH is guaranteed ≥2.31 V and VIL ≤1.32 V, providing adequate noise margin for 3.3 V LVTTL signaling.

Is the reset function truly asynchronous across temperature and voltage?

Yes - the nR input operates asynchronously across the full -40 °C to +125 °C range and 2.0 V to 6.0 V supply. Propagation delay from nR LOW to nQ LOW is 29 ns typ at 4.5 V, with no dependency on clock presence or state, enabling deterministic system initialization under all operating conditions.

Does 74HC73DB,118 support hot-swap or live-insertion?

No - the device lacks hot-swap protection circuitry. Applying VCC while inputs are driven can cause latch-up or excessive current through clamp diodes. Power sequencing must ensure VCC is stable before applying valid logic levels to any input, per Absolute Maximum Ratings (Table 4) and JEDEC JESD78 compliance.