DM7474N

Overview

The DM7474N is a dual D-type flip-flop integrated circuit manufactured by National Semiconductor, now part of onsemi. It features positive-edge triggering and includes independent preset and clear inputs for each flip-flop. The device operates within a supply voltage range of 4.75V to 5.25V and supports a maximum clock frequency of 15 MHz. It utilizes a 14-pin Mini-DIP package with a pitch of 0.300 inches (7.62mm). Key electrical specifications include a maximum propagation delay of 40ns at 5V with 15pF load, output currents of 400µA (high) and 16mA (low), and a static current of 30 mA. The component is rated for commercial temperatures from 0°C to 70°C.

Feature Summary

• Dual D-type flip-flops with positive-edge clock triggering
• Independent active-low preset and clear inputs
• Complementary outputs for each flip-flop element
• Standard TTL logic levels compatible

Applications

• Data storage and register circuits
• Shift registers
• Frequency division circuits
• Timing control systems

Procurement Notes

Verify the manufacturer source carefully, as National Semiconductor was acquired by Texas Instruments, and this specific part number is primarily associated with onsemi production. Confirm RoHS compliance status, as older versions may not meet current environmental standards. Check for obsolescence notices, as the DM7474N has been listed as obsolete in various distributor catalogs. Ensure the package type matches the required 14-MDIP specification for PCB layout compatibility.

Selection Notes

Select this component when a dual D-type flip-flop with preset and clear functions is required in a through-hole design. Consider the 40ns propagation delay and 15MHz clock limit for timing constraints. Evaluate the 16mA low-level output current capability against load requirements. Compare against modern alternatives if lead-free or surface-mount options are necessary for the assembly process.

Part Context

The DM7474N belongs to the standard 7400 series of logic integrated circuits, widely used in digital electronics. It is functionally equivalent to the SN7474 and other generic 7474 variants. The 'DM' prefix typically denotes the plastic DIP package variant produced by National Semiconductor/onsemi. This series forms the basis for many sequential logic designs in industrial and consumer applications.

Replacement Considerations

Public confirmed substitute part numbers include SN7474N (Texas Instruments) and MC7474P (onsemi). Verify pinout compatibility and electrical characteristics before substitution.