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Quad Buffer Line Driver 74HC126E 14-Pin DIP

Quad Buffer Line Driver 74HC126E 14-Pin DIP

$0.69 USD
$0.69 USD
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Title

The 74HC126E is a quad non-inverting buffer/line driver IC in a 14-pin DIP (Dual In-line Package) format, part of the 74HC (High-speed CMOS) family. Here are its key characteristics:

  • Operating Voltage: 2V to 6V typical, optimized for 5V operation
  • Features four independent non-inverting buffers with 3-state outputs
  • Each buffer has a separate output enable (OE) control pin
  • Active-high enable inputs (output is enabled when OE is HIGH)
  • High noise immunity characteristic of CMOS devices
  • Propagation delay: typically 7ns at VCC = 5V
  • Output drive capability: ±4mA at 5V
  • Input levels compatible with both CMOS and TTL devices

Pin configuration (14-pin DIP):

  1. 1OE (Output Enable 1)
  2. 1A (Input 1)
  3. 1Y (Output 1)
  4. 2OE (Output Enable 2)
  5. 2A (Input 2)
  6. 2Y (Output 2)
  7. GND (Ground)
  8. 3Y (Output 3)
  9. 3A (Input 3)
  10. 3OE (Output Enable 3)
  11. 4Y (Output 4)
  12. 4A (Input 4)
  13. 4OE (Output Enable 4)
  14. VCC (Power Supply)

Common applications include:

  • Bus interfacing
  • Level translation
  • Line driving for longer PCB traces
  • Signal buffering between different logic families
  • Data transmission in digital systems

 

74HC126E Quad Buffer Tutorial

What You'll Need

  • 74HC126E IC
  • 5V power supply
  • Breadboard
  • Jumper wires
  • LEDs with current-limiting resistors (330Ω recommended)
  • Push buttons or switches
  • Pull-down resistors (10kΩ)
  • 0.1µF bypass capacitor

Initial Setup

  1. Position the 74HC126E on your breadboard across the center gap
  2. Connect pin 7 (GND) to ground rail
  3. Connect pin 14 (VCC) to 5V supply rail
  4. Install a 0.1µF bypass capacitor between VCC and GND near the IC

Basic Buffer Operation

Testing Buffer 1:

  • Pin 1: Output Enable (1OE)
  • Pin 2: Input (1A)
  • Pin 3: Output (1Y)

Basic Circuit Setup:

  1. Connect a 10kΩ pull-down resistor from Input pin (Pin 2) to ground
  2. Install a push button between 5V and the Input pin
  3. Connect the Output Enable pin (Pin 1) to 5V
  4. Connect an LED and 330Ω resistor from Output pin (Pin 3) to ground

How It Works

When you press the button:

  1. Input pin receives 5V (HIGH)
  2. Buffer activates (Output Enable is HIGH)
  3. Output follows input, lighting the LED
  4. Releasing the button returns output to LOW

Common Applications

1. Level Translation

Perfect for connecting 5V devices to 3.3V systems

2. Fan-out Expansion

Drive multiple devices from a single source

3. Bus Buffering

Isolate and protect sensitive circuits

Troubleshooting Tips

  • Always use bypass capacitors for stable operation
  • Keep voltage below 6V maximum
  • Check Output Enable pins if output isn't working
  • Verify all power and ground connections
  • Consider using pull-up/down resistors for long connections

Technical Specifications

  • Operating Voltage: 2V to 6V
  • Optimized for 5V operation
  • Four independent non-inverting buffers
  • Individual output enable controls
  • Compatible with both CMOS and TTL devices
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