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SN74HC138D

Name: SN74HC138D
Rating: 4.7 (12 reviews)

IC DECODER/DEMUX 1X3:8 16SOIC

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Mfr。パート #SN74HC138D
パッケージ 16-SOIC
データシート SN74HC138D DataSheet
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仕様

Package	Bulk,Tube
Series	74HC
ProductStatus	Active
Type	Decoder/Demultiplexer
Circuit	1 x 3:8
IndependentCircuits	1
Current-OutputHighLow	5.2mA, 5.2mA
VoltageSupplySource	Single Supply
Voltage-Supply	2V ~ 6V
OperatingTemperature	-40°C ~ 85°C
MountingType	Surface Mount
Package/Case	16-SOIC (0.154, 3.90mm Width)

概要

Description

The SN74HC138D is a high-speed, low-power 3-to-8 line decoder/demultiplexer from Texas Instruments, part of the 74HC (High-speed CMOS) series. It converts a 3-bit binary input into one of eight active low outputs. The device features three enable inputs, allowing for cascading multiple decoders, and operates within a wide voltage range, making it suitable for various digital logic applications.
Key specifications include a supply voltage range of 2V to 6V, fast switching times (max 15 ns at Vcc = 5V), and low power consumption. The outputs are designed to sink up to 20 mA, making the SN74HC138D compatible with TTL logic levels.
Common applications include memory address decoding, data routing in communication systems, and control signal distribution in digital circuits. Its compact 16-pin SOIC package makes it easy to integrate into modern PCB designs. Overall, the SN74HC138D is a versatile component widely used in both consumer and industrial electronics.

Features

The SN74HC138D is a high-speed CMOS 3-to-8 line decoder/demultiplexer. Key features include:
1. Input/Output Logic Levels: Compatible with both 5V and 3V logic levels.
2. High Speed: Fast propagation delay, typically around 4.5 ns at 5V.
3. Low Power Consumption: Consumes less power compared to traditional TTL devices.
4. Active Low Outputs: Provides eight active low outputs which are decoded from three binary inputs.
5. Enable Inputs: Has three enable inputs (G1, G2A, G2B) for flexible operation and controlling output activation.
6. Wide Operating Voltage: Operates from a supply voltage of 2V to 6V.
7. Thermal Protection: Features thermal shutdown for reliable operation.
8. High Noise Immunity: Offers excellent noise margin due to CMOS technology.
The SN74HC138D is widely used in applications such as data routing, memory addressing, and signal demultiplexing.

Package

The SN74HC138D is packaged in a Dual In-line Package (DIP) type, specifically a 16-pin DIP (D package). This package type is designed for through-hole mounting on printed circuit boards.

Pinout

The SN74HC138D is a 3-to-8 line decoder/demultiplexer with a pin count of 16. It converts a 3-bit binary input into one of eight active low outputs. The pin functions are as follows:
1. Inputs:
- A0 (Pin 1)
- A1 (Pin 2)
- A2 (Pin 3)
- G1 (Pin 4, active high enable)
- G2A (Pin 5, active low enable)
- G2B (Pin 6, active low enable)
2. Outputs:
- Y0 (Pin 7), Y1 (Pin 8), Y2 (Pin 9), Y3 (Pin 10), Y4 (Pin 11), Y5 (Pin 12), Y6 (Pin 13), Y7 (Pin 14) - all active low outputs.
3. Power and Ground:
- VCC (Pin 15) - power supply (typically +2V to +6V).
- GND (Pin 16) - ground.
The device can be used in various applications such as memory address decoding and data routing.

Manufacturer

The SN74HC138D is manufactured by Texas Instruments (TI), a leading global semiconductor company. Texas Instruments designs and produces a wide range of electronic components, including analog and digital integrated circuits, microcontrollers, and processors. The company serves various industries, including automotive, industrial, consumer electronics, and telecommunications, providing innovative solutions for both analog and embedded processing applications. TI is well-known for its commitment to research and development, enabling advancements in technology and fostering a strong presence in the semiconductor market.

Application

The SN74HC138D is a 3-to-8 line decoder/demultiplexer used in various application areas including memory address decoding, data routing, and signal multiplexing. It can facilitate the selection of devices in communication systems, control circuits in embedded systems, and address decoding in microcontroller applications. Its low power consumption and high-speed performance make it suitable for digital circuit designs in consumer electronics, automotive systems, and industrial automation.

Equivalent

Equivalent products to the SN74HC138D include the 74HC138, 74HCT138, and MC14538. These chips are 3-to-8 line decoders/demultiplexers with similar specifications, suitable for applications requiring address decoding or signal routing. Always verify specific features and voltage levels for compatibility in your design.