DM7442AN

Overview

The DM7442AN is a BCD-to-decimal decoder manufactured by onsemi, formerly Fairchild Semiconductor. It consists of eight inverters and ten four-input NAND gates to decode binary-coded decimal inputs into one-of-ten active-high outputs. The device operates within a supply voltage range of 4.75V to 5.25V and features diode-clamped inputs for transient protection. It is housed in a 16-lead Plastic Dual-In-Line Package (PDIP) with a width of 0.300 inches.

Feature Summary

• Diode-clamped inputs provide protection against fast-rising transients
• Full decoding ensures all outputs remain high for invalid input conditions
• Capable of functioning as a 4-line-to-16-line or 3-line-to-8-line decoder

Applications

• BCD to decimal decoding systems
• Data display drivers
• Control logic circuits requiring one-hot encoding

Procurement Notes

Verify the manufacturer origin, as the part was originally produced by Fairchild Semiconductor before its acquisition by onsemi. Confirm the package style matches the 16-lead PDIP specification. Check for RoHS compliance status if required by project specifications, as older revisions may differ from current manufacturing standards.

Selection Notes

Select this component when a dedicated BCD-to-decimal function is required with active-high outputs. Ensure the design accommodates the typical propagation delay of 17 ns and power dissipation of 140 mW. Verify that the load requirements align with the specified output current capabilities for reliable operation.

Part Context

This device belongs to the standard 74-series logic family, specifically designed for digital decoding applications. It provides a direct interface between binary-coded decimal data sources and decimal display or control units, simplifying circuit design by eliminating the need for external decoding logic.

Replacement Considerations

Direct substitutes include other manufacturers' versions of the DM7442A or SN7442. Ensure any replacement maintains the same 16-pin DIP footprint and electrical characteristics to guarantee pin compatibility and functional equivalence.