74HCT112D,653

Overview

The 74HCT112D,653 is a dual negative-edge triggered JK flip-flop manufactured by Nexperia USA Inc. It features individual J and K inputs, asynchronous active-low set (nSD) and reset (nRD) inputs, and complementary nQ and Q outputs. The device operates within a supply voltage range of 2V to 6V for the HC series baseline, though HCT logic typically specifies 4.5V to 5.5V; however, official datasheet text for this specific part number in the provided source material explicitly lists the 74HC112/74HCT112 family characteristics including CMOS/TTL input levels. It supports operation from -40°C to +85°C and up to +125°C. The component includes Schmitt-trigger action on the clock input for tolerance to slow rise/fall times and ESD protection exceeding 2000V HBM.

Feature Summary

• Dual negative-edge triggered JK flip-flop configuration with independent J and K inputs
• Asynchronous active-low set and reset inputs operating independently of the clock signal
• Schmitt-trigger action on the clock input ensures high tolerance to slower clock transition rates
• Complementary nQ and Q outputs available for flexible circuit interfacing

Applications

• Digital state storage and memory elements in sequential logic circuits
• Frequency division and counter applications utilizing JK toggle modes
• Shift register construction for serial-to-parallel or parallel-to-serial data conversion
• Timing control systems requiring precise edge-triggered state changes

Procurement Notes

Verify the specific suffix '653' against the manufacturer's current production status, as availability may vary. Confirm that the required operating temperature range (-40°C to +125°C) aligns with your system design constraints. Ensure interface voltage levels match the HCT TTL input specifications if driving from standard logic sources. Check for any recent Product Change Notifications regarding marking or assembly updates.

Selection Notes

Select this component when a dual JK flip-flop with asynchronous control is required. The HCT logic level compatibility allows direct interfacing with TTL-based systems while maintaining CMOS output drive capabilities. Consider the Schmitt-trigger clock input if the application involves noisy environments or signals with slow edges. Verify pinout compatibility if replacing older variants, as package dimensions remain consistent within the SOIC family.

Part Context

This component belongs to the Nexperia 74HCT112 family, which are dual JK flip-flops with set and reset. It is part of the broader 74HC/HCT logic series designed for high-speed digital applications. The device is housed in a surface-mount package, suitable for automated assembly processes. It complements other sequential logic devices like shift registers and counters within the same product line.

Replacement Considerations

Public confirmed substitute part numbers include 74HCT112PW,118 and 74HC112D,653. When substituting, verify that the alternative maintains the same HCT logic input levels and asynchronous set/reset functionality. Ensure the replacement package matches the physical footprint requirements of the existing design.