7448 BCD to 7-Segment Decoder/Driver IC (DIP)

Overview

The 7448 BCD to 7-Segment Decoder/Driver IC is a TTL logic device that converts 4-bit Binary Coded Decimal (BCD) inputs into the proper segment outputs to drive standard 7-segment LED displays. Supplied in a 16-pin Dual In-Line Package (DIP), the 7448 is breadboard friendly and well suited to educational projects, hobby electronics, and industrial numeric display applications.

Key Features

• BCD to 7-segment decoding: Converts A, B, C, D inputs into segment outputs a through g
• Designed for LED displays: Compatible with standard common anode 7-segment indicators (use current-limiting resistors)
• TTL logic family: Standard TTL voltage levels for easy interfacing with legacy and modern TTL-compatible systems
• Control inputs: Lamp test, blanking input and ripple blanking for leading zero suppression and diagnostics
• Package: 16-pin DIP for easy prototyping and through-hole PCB assembly

Technical Specifications

• IC Type: BCD to 7-Segment Decoder/Driver
• IC Number: 7448
• Logic Family: TTL
• Package Type: DIP (Dual In-Line Package), 16 pins
• Input Type: 4-bit BCD (A, B, C, D)
• Output Type: 7-segment outputs (a through g)
• Operating Voltage: 5 V typical
• Operating Temperature: Standard commercial range

Typical Applications

• Digital clocks and timers
• Counters and frequency displays
• Numeric display systems and instrumentation
• Arduino and microcontroller display interfacing
• Educational electronics and logic demonstrations

Advantages

• Simplifies driving 7-segment displays by handling segment decoding internally
• Reduces external component count compared to discrete decoding circuits
• Reliable TTL performance and predictable timing
• Easy integration into prototypes and final designs using DIP footprint

Usage Notes and Typical Connection Tips

• Use appropriate current-limiting resistors (one per segment) when connecting LED segments to prevent damage.
• The 7448 is intended for common anode displays; confirm display type before wiring.
• Ensure a stable 5 V supply and correct power polarity to avoid IC damage.
• Use lamp test to illuminate all segments for quick verification of display and wiring.
• Blanking and ripple blanking inputs allow suppression of leading zeros in multi-digit displays when chaining multiple decoders.

Safety and Handling

• Observe ESD precautions when handling the IC to protect the internal gates.
• Always power down circuits before inserting or removing the IC from a socket or breadboard.
• Verify wiring and resistor values before applying power to prevent excessive LED current.

Note: Images are for Illustration Purposes Only. Actual IC manufacturer marking and appearance may vary slightly.