Nexperia USA Inc. 74HC73DB,112

Overview

74HC73DB,112 from Nexperia is a dual negative-edge-triggered JK flip-flop with asynchronous reset, used for synchronous logic state storage and edge-sensitive control in digital sequencers, counters, and register files. It features two independent flip-flops, 2.0–6.0 V supply range, Schmitt-trigger clock inputs, and operation up to +125 °C.

For engineers reviewing the 74HC73DB,112 datasheet, 74HC73DB,112 pinout, 74HC73DB,112 application, or 74HC73DB,112 equivalent, this page delivers verified functional behavior, SO14 package mapping, timing constraints (e.g., 15 ns tpd at 6.0 V), reset propagation delay, and direct substitution guidance for legacy 74HC73 variants.

Technical Context

This device implements two independent JK flip-flops sharing no internal coupling-each has dedicated J, K, nCP (negative-edge clock), and nR (asynchronous active-low reset) terminals. The Schmitt-trigger input on each nCP enables robust operation with slow-rising or noisy clock signals, eliminating external hysteresis circuitry.

Each flip-flop provides complementary true (nQ) and inverted (nQ) outputs, supports toggle/set/reset/hold modes per the function table, and guarantees predictable state transitions only when J/K inputs meet setup time (e.g., 14 ns min at 6.0 V) before the HIGH-to-LOW clock edge.

Key Specifications

Pinout & Package

74HC73DB,112 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 and 74HCT73DB,112, the 74HC73DB,112 provides optimal balance of low ICC (4 μA), Schmitt-trigger noise immunity, and broad VCC range - making it preferred for new designs with mixed-voltage interfaces and battery-sensitive operation.

Availability

74HC73DB,112 is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC73DB,112 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 discrete, logic, and MOSFET devices optimized for efficiency and miniaturization in high-volume applications.

The 74HC73 belongs to Nexperia's 74HC logic family - engineered for low-power, wide-VCC operation in industrial control, consumer electronics, and automotive subsystems where noise immunity and thermal stability are critical.

FAQ

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

The 74HC73DB,112 requires J and K inputs to be stable for at least 3 ns before the HIGH-to-LOW clock transition at VCC = 6.0 V, per Table 7. This value increases to 14 ns at VCC = 2.0 V. Violating setup time risks metastability or incorrect state capture, especially in high-noise environments.

Can the asynchronous reset (nR) be used while the clock is held HIGH?

Yes - nR is fully asynchronous and operates independently of the clock state. When nR is pulled LOW, nQ forces to LOW and nQ to HIGH immediately, regardless of nCP level or timing. This behavior is guaranteed across the full -40 °C to +125 °C operating range and does not require clock activity.

Does the 74HC73DB,112 support mixed-voltage operation between inputs and outputs?

No - all inputs and outputs reference the same VCC rail. Input thresholds scale with VCC (e.g., VIH = 4.2 V at 6.0 V), and outputs swing rail-to-rail. Interfacing with lower-voltage logic requires external level shifters or series resistors with clamping diodes, as enabled by the built-in input clamp diodes.

Is the SO14 package (SOT108-1) RoHS-compliant and lead-free?

Yes - the 74HC73DB,112 uses a lead-free, RoHS-compliant SO14 package (SOT108-1) with matte tin-plated gull-wing leads. Reflow profile follows JEDEC J-STD-020D, with peak temperature ≤ 260 °C and time above liquidus ≤ 60 seconds, ensuring compatibility with standard Pb-free assembly processes.