BCD to 7-Seg Decoder 7447 Common Anode

The BCD to 7-Seg Decoder 7447 is a 7400-series IC that converts a 4-bit binary-coded decimal (BCD) input into the seven segment signals needed to show the digits 0 to 9 on a common anode LED display. Its open-collector outputs are active LOW, so each output sinks current through a segment when that segment should light. It also has lamp test and ripple blanking inputs, which makes it a staple of digital electronics labs.

BCD to 7-Seg Decoder 7447 Specifications

• Function: BCD to 7-segment decoder/driver
• Display type: common anode (active-LOW, open-collector outputs)
• Outputs: segments a to g
• Inputs: A, B, C, D (BCD), /LT (lamp test), /RBI (ripple blanking input) and /BI-/RBO (blanking input / ripple blanking output)
• Logic family: 7400 series
• Supply voltage: 5 V
• Package: 16-pin DIP
• Pinout: 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 VCC

BCD to 7-Seg Decoder 7447 Applications

• Showing counter outputs, for example from a 7490 decade counter, on a 7-segment display
• Digital clocks, timers and scoreboards in electronics labs
• Teaching binary, BCD and combinational logic
• Blanking leading zeros in multi-digit displays

What's in the Box

• 1 × 7447 BCD to 7-segment decoder IC

Tip: Use it with a common anode display such as a 0.56 inch 1-digit CA display: connect the display's common pin to 5 V and fit a 220–330 Ω resistor between each 7447 output and its segment, because the outputs have no current limiting. Tie /LT and /RBI to 5 V for normal operation.

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