7447 BCD to 7-Segment Decoders/Drivers Common Anode 5V 24mA IC DIP-16
The 7447 (SN74LS47) is a TTL-based BCD to 7-segment decoder/driver designed to interface digital systems with common anode LED displays. It converts 4-bit binary-coded decimal (BCD) inputs into the corresponding 7-segment output signals, allowing easy display of decimal numbers (0–9). The IC features open-collector outputs capable of directly driving LED segments with high current sinking capability.
This device includes built-in functions such as lamp test, ripple blanking, and input blanking, making it highly versatile for display systems. It is widely used in digital clocks, counters, calculators, and embedded systems where numeric display is required. Its robust design ensures reliable operation in standard TTL logic environments.
Features
- BCD to 7-segment decoding (0–9).
- Designed for common anode displays.
- Open-collector outputs for direct LED driving.
- High current sinking capability (up to 24mA per segment).
- Built-in lamp test (LT) function.
- Ripple blanking input/output (RBI/RBO) for leading zero suppression.
- Blanking input (BI) for display control and brightness modulation.
- TTL compatible inputs.
Specifications:
| Parameter | Value | Unit |
|---|---|---|
| Supply voltage | 4.75 to 5.25 | V |
| Operating ambient temperature | 0 to 70 | °C |
| Output off‑state voltage (a‑g) | 15 | V |
| On‑state output current (a‑g) | 24 | mA |
| Output LOW current (BI/RBO) | 3.2 | mA |
| Output HIGH current (BI/RBO) | -50 | µA |
| High‑level input current (1 U.L.) | 40 | µA |
| Low‑level input current (1 U.L.) | 1.6 | mA |
| Output LOW drive factor | 15 | U.L. |
Pinout:
| Pin No. | Name |
|---|---|
| 1 | B |
| 2 | C |
| 3 | LT |
| 4 | BI/RBO |
| 5 | RBI |
| 6 | D |
| 7 | A |
| 8 | GND |
| 9 | e |
| 10 | d |
| 11 | c |
| 12 | b |
| 13 | a |
| 14 | g |
| 15 | f |
| 16 | V |
Package Included:
- 1x 7447 BCD to 7-Segment Decoders/Drivers Common Anode 5V 24mA IC DIP-16.