74HC138 Signal Switches, Multiplexers, Decoders by Diodes Inc (Active Lifecycle)

Description

The 74HC138 is a hexadecimal decoded switch or multiplexer IC from Shenzhen Fuman Elec. It's a popular component in digital electronics, widely used for encoding and decoding binary information. In brief, the 74HC138 is an 8-input, 3-output mux that can be used as a demultiplexer or a decoder. Each input selector (S0 to S2) controls three decoded outputs Q0, Q1, and Q2, which correspond to unique hexadecimal codes (000 to 111). With the right combination of inputs, the IC can output any desirable binary code. The device operates with a standard Vcc voltage range of 2-6V and provides high-speed switching with a maximum frequency of up to 25 MHz. Its SOIC-16 package makes it easy to integrate into various electronic circuits and PCBs. If you have more specific questions about applications, usage, or specifications, feel free to ask!

Package

The package type of 74HC138 is SO-16 (Small Outline - 16).

Pinout

The 74HC138 is a 3-to-8 line decoder/demultiplexer. It has a pin count of 16.

Here's a brief overview of its functions:

• Pin 1: VCC (power supply)
• Pins 2-5: A0-A3 (address inputs)
• Pins 6-13: Y0-Y7 (output lines)
• Pins 14, 15: G (ground), OE (output enable)

The device decodes a 3-bit binary address to select one of the eight output lines. It can be used as an encoder or decoder, depending on the application.

Manufacturer

The manufacturer of the 74HC138 is Shenzhen Fuman Elec, which appears to be a Chinese electronics firm based in Shenzhen.

Applications

The 74HC138 is a 3-to-8 line decoder/demultiplexer, commonly used in various applications such as:

• Address decoding in microprocessors
• Memory chip select logic
• Data multiplexing in serial interfaces (e.g., SPI, I2C)
• Digital signal processing and control systems

Its versatility makes it suitable for a wide range of industries, including automotive, industrial automation, and consumer electronics.

Equivalent

The equivalent products of 74HC138 are:

• CD4012
• 74138
• 74LS138
• 74ACT138

These are all decoder/demultiplexer ICs with similar functionality to the 74HC138.