4027BDMQB

Overview

The National Semiconductor 4027BDMQB is a dual J-K master/slave flip-flop implemented in monolithic CMOS technology. It contains two independent 1-bit elements within a single package, utilizing N- and P-channel enhancement mode transistors for construction. The device features positive edge triggering for clock inputs and includes dedicated Set and Reset control lines for each element. Packaged in a 16-pin CDIP (0.300 inch / 7.62 mm) ceramic dual in-line format, it supports a maximum clock frequency of 24 MHz. Output drive capabilities provide 6.8 mA for both high and low states, with an input capacitance of 5 pF.

Feature Summary

• Dual independent J-K master/slave flip-flop elements
• Positive edge clock triggering mechanism
• Dedicated asynchronous Set and Reset controls per element
• Monolithic CMOS construction using complementary transistors

Applications

• Digital data storage and register circuits
• Frequency division and counter logic designs
• State machine implementation in sequential logic systems
• Pulse synchronization and timing control applications

Procurement Notes

Verify the manufacturer origin carefully, as National Semiconductor assets were acquired by Texas Instruments. Confirm that the specific 4027BDMQB part number corresponds to the original National Semiconductor production run rather than a TI equivalent. Check datasheet revisions to ensure compatibility with required voltage ranges and pin configurations before finalizing procurement orders.

Selection Notes

Select this component when dual independent JK functionality is required in a compact ceramic package. Ensure the design accommodates the 24 MHz maximum clock frequency limit and the specific output current drive requirements of 6.8 mA. Verify that the positive edge triggering aligns with the system timing architecture and that the 16-CDIP footprint fits the target PCB layout constraints.

Part Context

The 4027 series represents a standard dual JK flip-flop configuration widely used in digital electronics. The 4027BDMQB variant specifically denotes the National Semiconductor manufacturing source and the 16-CDIP package style. This component belongs to the broader family of CMOS logic devices, offering high noise immunity and low power consumption typical of complementary metal-oxide-semiconductor technologies.

Replacement Considerations

The CD4027 is the industry-standard equivalent part number for this function. Verify pinout compatibility between the National Semiconductor 4027BDMQB and alternative sources such as Texas Instruments or other manufacturers before substitution.