DM7445N

Specialty Logic Overview

The DM7445N is a BCD-to-decimal decoder/driver manufactured by onsemi, belonging to the standard 7400 logic series. It operates within a supply voltage range of 4.75V to 5.25V and supports an operating temperature range of 0°C to 70°C. The component is housed in a 16-PDIP package with through-hole mounting capabilities. This integrated circuit functions as a dedicated logic device designed for decoding binary-coded decimal inputs into ten distinct active-low outputs.

Specialty Logic Feature Summary

• Performs conversion of four-bit binary-coded decimal input signals into one of ten mutually exclusive active-low output lines
• Designed specifically for driving high-voltage loads such as Nixie tubes or gas-display indicators
• Includes built-in suppression for invalid input states to ensure stable operation during undefined code conditions

Specialty Logic Applications

• Driving Nixie tube displays in vintage instrumentation and retro electronics restoration
• Gas-discharge indicator panel control systems
• Decimal decoding stages in legacy digital computing hardware

Specialty Logic Procurement Notes

Verify component authenticity carefully as this part is obsolete. Confirm that the specific manufacturer marking matches onsemi standards. Check for physical damage to the DIP leads. Ensure the replacement source provides valid traceability documentation. Validate that the substitute component meets the original electrical specifications for your application.

Specialty Logic Selection Notes

Select this component only when maintaining compatibility with existing 7400-series designs requiring BCD-to-decimal translation. Consider the through-hole packaging constraints for PCB layout. Evaluate if modern CMOS alternatives meet the required drive current and voltage levels for the intended load type without redesigning the surrounding circuitry.

Specialty Logic Part Context

This device is part of the extensive onsemi 7400 logic family, which established industry standards for TTL-compatible digital logic functions. The DM7445 serves a niche role in specialized display driving applications where direct interface to high-voltage indicators is necessary. Its discontinuation reflects the shift toward more integrated display controllers in modern electronics manufacturing.

Specialty Logic Replacement Considerations

SN7445N from Texas Instruments is confirmed as a direct functional substitute.