HD74LS138P DIP-16 Decoder Multiplexer IC – 5 Pack | 74LS138

HD74LS138P 3-to-8 Line Decoder / Demultiplexer – 5-Piece Set

Get five brand-new HD74LS138P integrated circuits in a single pack. These DIP-16 through-hole ICs are 3-to-8 line decoder/demultiplexers built on the proven 74LS TTL logic family — a staple in digital design, prototyping, and electronics repair projects. Each chip features three enable inputs for straightforward cascading and glitch-free switching, making them ideal for memory address decoding, data routing, and embedded system design.

• Part Number: HD74LS138P / HD74LS138
• Package: DIP-16 (Dual In-Line, 16-pin, straight/through-hole)
• Function: 3-to-8 Line Decoder / Demultiplexer
• Logic Family: 74LS (Low-Power Schottky TTL)
• Condition: Brand New
• Quantity: 5 pieces per order
• High-Concern Chemicals: None
• Made in Mainland China

Key Features

• 3-to-8 line decoding with active-LOW outputs for versatile logic interfacing
• Three enable inputs (2 active-LOW, 1 active-HIGH) allow easy cascading and chip selection
• Standard DIP-16 footprint fits breadboards, perfboards, and PCB sockets with no special tooling
• Low-power Schottky (LS) process ensures fast switching with minimal current draw
• Compatible with all standard 74-series TTL and CMOS logic designs
• Pack of 5 — great for prototyping spares, classroom kits, or multi-board builds

Common Applications

• Memory address decoding in microcontroller and microprocessor circuits
• Data demultiplexing and bus expansion
• Seven-segment display driving via decoder logic
• Digital logic education, breadboard experimentation, and lab projects
• Replacement or spare for existing HD74LS138 or compatible 74LS138 chips

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Frequently Asked Questions

Q: Are these HD74LS138P ICs compatible with standard 74LS138 pinouts and circuits?

A: Yes. The HD74LS138P follows the industry-standard 74LS138 pinout and electrical specification, making it a direct drop-in replacement for any circuit designed around the 74LS138, SN74LS138, or M74LS138 in a DIP-16 package. It works with both TTL and CMOS 5V logic systems.

Q: What does the 3-to-8 decoder/demultiplexer function mean in practice?

A: The HD74LS138P takes a 3-bit binary input (8 possible combinations) and activates one of eight corresponding active-LOW output lines. This makes it perfect for selecting one of eight memory chips, I/O ports, or devices in a digital system — only the selected output goes LOW while all others remain HIGH.

Q: Is the DIP-16 package breadboard-compatible?

A: Absolutely. The DIP-16 through-hole package has standard 0.1-inch (2.54 mm) pin spacing, so it plugs directly into any standard breadboard, PCB socket, or perfboard without adapters or soldering fixtures.

Q: Why buy a 5-pack instead of a single chip?

A: Having multiple units on hand is ideal for multi-board projects, prototyping iterations, classroom or lab kits, and keeping spares for future repairs. The 5-pack offers better value per chip compared to buying individually.