CD74HC138M

Signal Switches, Multiplexers, Decoders Overview

The CD74HC138M is a high-speed CMOS logic decoder/driver manufactured by Harris Corporation. It belongs to the HC/UH series and features inverted outputs in a PDSO16 package. The device operates within a temperature range of -55°C to 125°C and supports a load capacitance of 50 pF. It has a maximum output current of 0.004 A and includes three enable inputs for cascading applications. Classified as an OTHER DECODER/DRIVER type, it utilizes plastic/epoxy material for its SOP body.

Signal Switches, Multiplexers, Decoders Feature Summary

• Features inverted outputs suitable for specific decoding logic requirements
• Includes three enable inputs to facilitate cascaded decoder configurations
• Operates across an extended industrial temperature range

Signal Switches, Multiplexers, Decoders Applications

• Memory address decoding
• Data routing applications
• System control logic

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify component authenticity due to potential availability from secondary markets or obsolete status. Confirm RoHS compliance status as documentation indicates non-compliance. Ensure the PDSO16 package matches design constraints. Validate manufacturer origin given historical corporate acquisitions affecting production lineage. Check for lead time variations associated with legacy inventory sources.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when inverted logic outputs are required for 3-to-8 line decoding. Consider the HC series speed and power characteristics relative to system needs. Verify voltage compatibility with target CMOS interfaces. Evaluate thermal performance within the specified operating range. Compare against HCT variants if TTL input compatibility is necessary instead.

Signal Switches, Multiplexers, Decoders Part Context

This part is part of the broader CD74HC138 family, which includes non-inverting counterparts like the CD74HC238. Manufactured originally by Harris Semiconductor, these devices were designed for high-speed CMOS applications. The M suffix denotes the surface-mount SOIC package variant. These decoders bridge low-power CMOS operation with speeds comparable to low-power Schottky TTL.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Public confirmed substitute part numbers include CD74HC238M for non-inverting logic requirements. Other compatible family members may include variants from different manufacturers adhering to the standard 74HC138 specification.