MC54145F

Overview

The MC54145F is a TTL-compatible decoder and driver integrated circuit manufactured by Motorola. It features a 1-of-10 decoding function with ten active-low outputs, designed to decode four binary inputs into one of ten distinct states. The device utilizes a ceramic flatpack package with fourteen terminals, suitable for dual in-line pin configurations. It operates within a military-grade temperature range from -55 °C to +125 °C, ensuring reliability in harsh environments. The component is constructed using standard TTL technology and includes specific terminal arrangements for power and ground connections.

Feature Summary

• Provides 1-of-10 decoding capability with active-low outputs
• Compatible with standard TTL logic families
• Military-grade temperature rating for extreme environment operation
• Ceramic flatpack construction for durability

Applications

• Decoding binary input signals in industrial control systems
• Driver circuits requiring high-temperature stability
• Military aerospace electronic assemblies
• Logic state selection in complex digital architectures

Procurement Notes

Verify the manufacturer origin carefully, as Motorola's semiconductor assets were acquired by NXP Semiconductors. Confirm that the specific part number corresponds to the original Motorola production run if historical authenticity is required. Check datasheet revisions to ensure compatibility with current design specifications. Validate the ceramic package integrity upon receipt. Ensure the component meets the specified military temperature standards for your application.

Selection Notes

Select this component when a robust, high-temperature tolerant decoder is required for critical applications. The ceramic package offers superior thermal and mechanical stability compared to plastic alternatives. Consider the active-low output polarity when designing interfacing logic. Verify voltage levels match the system's TTL requirements. Evaluate the physical footprint constraints against the flatpack dimensions before finalizing the PCB layout.

Part Context

This component belongs to the broader family of TTL logic devices produced during the era of discrete semiconductor manufacturing dominance. Motorola was a primary supplier of such logic gates and decoders for defense and industrial sectors. The MC54xx series typically denotes military-grade performance, distinguishing it from commercial variants. These parts laid the groundwork for modern complex logic integration.

Replacement Considerations

Check for equivalents from NXP Semiconductors, which acquired Motorola's semiconductor business. Other manufacturers may offer compatible 1-of-10 decoders, but verify pinout and electrical characteristics. Ensure any substitute maintains the same operating temperature range and package style for direct replacement.