74HC47 ( BCD to 7-Segment Decoder)

Overview

The 74HC47 is a high-speed CMOS BCD to 7-segment decoder/driver IC, designed to interface directly with common anode (CA) seven-segment displays. It simplifies digital display systems by converting a 4-bit Binary Coded Decimal (BCD) input into the appropriate signals to light up the correct segments. With its open-collector outputs, it can drive displays directly, making it a staple for hobbyists and professionals building digital clocks, counters, and other numeric readouts.

Key Features

• BCD to 7-segment decoding: Converts 4-bit BCD input (0-9) to drive a 7-segment display.
• Common anode compatibility: Specifically designed for common anode displays.
• Open-collector outputs: Can sink up to 40mA per segment, allowing direct drive of LED displays.
• High-speed CMOS technology: Low power consumption and high noise immunity.
• Lamp test function: Allows checking that all segments are functional.
• Ripple blanking input/output: Enables leading/trailing zero suppression in multi-digit displays.
• Wide operating voltage: 2V to 6V, compatible with TTL levels.
• Standard 16-pin DIP package: Easy to use on breadboards and PCBs.

Technical Specifications

• Supply Voltage (VCC): 2V to 6V
• Input Voltage (VI): 0V to VCC
• Output Current (IO): Up to 40mA per segment (sink)
• Propagation Delay: Typically 15ns at 5V
• Operating Temperature: -40°C to +85°C
• Package: 16-pin DIP (also available in SOIC)
• Logic Family: 74HC (High-speed CMOS)
• Inputs: 4-bit BCD, Lamp Test, Ripple Blanking Input
• Outputs: 7-segment outputs (a-g), Ripple Blanking Output

Applications & Use Cases

• Digital clocks and timers: Display hours, minutes, and seconds.
• Counters and frequency meters: Show numerical values in real-time.
• Measurement instruments: Multimeters, thermometers, and other digital readouts.
• Embedded systems projects: Interfacing microcontrollers with 7-segment displays.
• Educational kits: Teaching digital logic and display driving.
• Industrial control panels: Numeric display for process parameters.

What's Included

• 1x 74HC47 BCD to 7-Segment Decoder/Driver IC (DIP-16)

Compatibility

• Works with any common anode 7-segment display (e.g., 0.36", 0.56", 1" displays).
• Can be used with microcontrollers (Arduino, Raspberry Pi, etc.) via BCD output pins.
• For common cathode displays, use 74HC48 or 74LS48 instead.
• Suitable for breadboard prototyping and PCB integration.

MOKWN Recommendation

For makers in Egypt looking to build reliable digital displays, the 74HC47 is an excellent choice. It's easy to use, widely available, and perfect for educational projects and prototypes. Pair it with a common anode 7-segment display and a current-limiting resistor on each segment for optimal brightness and longevity. If you're using a microcontroller, remember to set the BCD pins as outputs and drive them with the appropriate voltage levels.

Order your 74HC47 today from MOKWN and bring your digital display projects to life!