7447 BCD to 7-Segment Decoder/Driver IC (DIP)

Overview: 7447 BCD to 7-Segment Decoder/Driver IC (DIP)The 7447 BCD to 7-Segment Decoder/Driver converts a 4-bit binary coded decimal input into the seven-segment signals needed to display digits 0 to 9 on common-anode LED displays. With open-collector, active-LOW outputs and TTL-compatible inputs, the 7447 simplifies numeric display designs in counters, clocks, meters, microcontroller projects, and educational kits.Key FeaturesBCD (A, B, C, D) to seven-segment decode for digits 0 to 9Common-anode display driver with open-collector, active-LOW outputs (a–g)Control pins: LT (Lamp Test), BI̅ (Blanking Input), RBI and RBO for cascading and blankingTTL-compatible inputs; nominal 5 V supply for rapid switchingStandard DIP-16 package, compatible with breadboards and through-hole PCBsTechnical SpecificationsSupply voltage: 4.75 to 5.25 V (TTL)Inputs: A, B, C, D (BCD), LT, BI̅, RBIOutputs: a, b, c, d, e, f, g (active-LOW), plus RBODisplay type: Common-anode 7-segmentPackage: DIP-16Control Pins and FunctionsLT (Lamp Test): Forces all segment outputs LOW to illuminate every segment for testing.BI̅ (Blanking Input): When asserted, blanks the display by turning off all segments.RBI (Ripple Blanking In) and RBO (Ripple Blanking Out): Support leading-zero suppression when cascading multiple digits. Use RBI from the next digit to propagate blanking signals.Wiring and Usage TipsConnect the display common anode to 5 V.Place a current-limiting resistor in series with each segment between the segment pin and the 7447 output to limit LED current.Inputs A, B, C, D receive the BCD code. Drive them with TTL outputs or a microcontroller interface at 5 V logic levels.Use LT for quick lamp tests during manufacturing or debugging. Use BI̅ to blank the display for power saving or visual effects.For multi-digit displays, cascade RBO of the less significant digit to RBI of the next digit to implement ripple blanking and leading-zero suppression.Typical ApplicationsUp/down counters and frequency displaysDigital clocks, timers, and stopwatchesMicrocontroller numeric readouts and training labsEducational kits, prototyping boards, and hobby electronicsPackage and PrototypingThe DIP-16 package makes the 7447 ideal for breadboard prototyping and through-hole PCB designs. Its TTL-level inputs allow direct interfacing with legacy logic families and many microcontrollers when run at standard 5 V.Usage tip: When wiring, remember the 7447 outputs are active-LOW open-collector. The common anode goes to 5 V and each segment line should include a resistor to limit LED current.Note: Images are for illustration purposes only. Category: Integrated Circuits (ICs) Tags: 7-segment driver, 7447, 7447 IC, 74xx logic IC, BCD to 7-segment decoder, BI RBI RBO, common-anode driver, DIP-16, display decoder, Electronics Components, Lamp Test, Student Projects, TTL display driver College Road Electronics4.85 (317 Reviews)