MC74ACT139ML1

Overview

The MC74ACT139ML1 is a dual 1-of-4 decoder/demultiplexer manufactured by onsemi, belonging to the 74ACT logic family. It operates within a supply voltage range of 4.5V to 5.5V and features TTL-compatible inputs with CMOS outputs. The device provides two independent decoders, each utilizing three address inputs to select one of four active-low outputs. Designed for surface-mount applications, it is housed in a 16-pin ML1 plastic small outline package. The component supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Dual independent 1-of-4 decoding functionality integrated into a single package
• TTL-compatible input thresholds ensuring seamless interface with standard logic families
• Active-low output states providing direct compatibility with common control circuits

Applications

• Address decoding in microprocessor-based systems
• Data routing in digital communication interfaces
• Memory chip selection in embedded storage architectures

Procurement Notes

Verify the specific ML1 package designation against the manufacturer's current datasheet to confirm pinout and mechanical dimensions. Ensure the ordering suffix matches the required tape and reel or cut tape specifications. Confirm RoHS compliance status through official environmental declarations prior to final procurement approval.

Selection Notes

Select this component when dual independent decoding is required within a limited board area. The ACT series offers faster switching speeds compared to standard AC logic while maintaining low power consumption. Verify that the system voltage aligns with the 4.5V to 5.5V operational range and that input signals meet TTL compatibility requirements.

Part Context

This part belongs to the broader 74ACT139 family, which includes variants with different packaging options such as SOIC and DIP. The ML1 package specifically denotes a plastic small outline configuration suitable for automated surface-mount assembly processes. It serves as a functional equivalent to other industry-standard dual decoder ICs within the same logic family constraints.

Replacement Considerations

Cross-reference with MC74ACT139DG or MC74ACT139DR2G for alternative packaging options from the same manufacturer. Verify pin-to-pin compatibility before substituting with devices from other vendors to ensure electrical and mechanical alignment.