DM74LS47A 7447 BCD to 7-Segment Decoder Driver

The DM74LS47A / 7447 IC is a BCD (Binary-Coded Decimal) to 7-segment display decoder and driver designed for driving common anode LED displays. It accepts a 4-bit BCD input and provides the necessary outputs to display decimal digits (0–9) on a 7-segment display.

With active low outputs and TTL compatibility, this IC is widely used in digital display applications such as counters, timers, digital clocks, and calculators. The device also includes features like lamp test, ripple-blanking input (RBI), and ripple-blanking output (RBO) for enhanced display control.

🔹 Applications

• Digital clocks and timers

• Electronic counters and meters

• Calculator display units

• Numeric display in microcontroller projects

• Robotics and automation indicators

• Educational and DIY electronics projects

🔹 Precautions

• Works only with common anode displays

• Ensure proper supply voltage: 4.75V – 5.25V

• Do not exceed 7V absolute maximum rating

• Avoid incorrect wiring of BCD inputs to prevent display errors

• Protect from ESD damage during handling

• Limit soldering heat (<260°C for 10s max)

🔹 Technical Specifications

• IC Type: BCD to 7-Segment Decoder/Driver

• IC Family: TTL 74LS series

• Package: DIP-16

• Input Type: 4-bit BCD (Binary Coded Decimal)

• Output Type: Active Low, drives common anode display

• Special Features: Lamp Test, Ripple Blanking Input/Output

• Supply Voltage (Vcc): 4.75V – 5.25V

• Output Current: Sink current suitable for LED driving

• Propagation Delay: ~25ns (typical)

• Fan-out: 10 LS-TTL loads

• Operating Temperature Range: 0°C to +70°C

• Pin Count: 16 pins

📹 Tutorial Video

Watch 7447 BCD to 7-Segment Decoder Tutorial

🔹 Related Categories

• IC’s

• Electronics Components

• Tools and Accessories

🔹 Summary

The DM74LS47A / 7447 BCD to 7-Segment Decoder/Driver IC (DIP-16) is a must-have for digital display applications, enabling seamless conversion of BCD inputs into numeric display outputs on a common anode 7-segment display. With features like lamp test and ripple blanking, it is widely used in clocks, counters, calculators, and educational projects. A highly useful addition to your IC’s collection.