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74LS47 Introduction: BCD to 7 segment decoder IC [Video]

Author: Mia Date: 4 Mar 2021  144

74ls47 pinout

74LS47 is a BCD to 7-segment decoder/driver IC.


This is an introduction blog to 74LS47 BCD to 7-segment decoder ic, which will cover as much information as possible, including its pinout, features, some useful application circuits and other information. Anyway, i hope you guys like it!

This tutorial video shows how to use 74LS47 in a display project.


74LS47 Description

74LS47 Pinout

74LS47 Features

74LS47 Parameter

74LS47 Application Circuits

74LS47 Package

74LS47 Manufacturer

Component Datasheet


74LS47 Description

74LS47 is a Low Power Schottky BCD to 7-Segment Decoder/Driver consisting of NAND gates, input buffers and 7 AND-OR-INVERT gates. They offer direct active low, high sink current outputs for driving indicators. Seven NAND gates and one driver are connected in pairs to make BCD data and its complement available to the seven AND-OR-INVERT gates.

74LS47 Pinout

74ls47 74ls47 pinout
74LS47 74LS47 Pinout


Pin No Pin Name Description
1 B BCD input of the IC
2 C BCD input of the IC
3 Display test/Lamp test To test the display LED
4 Blank Input To turn-off the LEDs of the display
5 Store Store or strobe a BCD code
6 D BCD input of the IC
7 A BCD input of the IC
8 GND Ground Pin
9 e 7 segment output 1
10 d 7 segment output 2
11 c 7 segment output 3
12 b 7 segment output 4
13 a 7 segment output 5
14 g 7 segment output 6
15 f 7 segment output 7
16 VCC Supply Voltage

74LS47 Features

  • Function: Decoder, Demultiplexer

  • Technology Family: LS

  • VCC (Min): 4.75V

  • VCC (Max): 5.25V

  • Channels: 1

  • Voltage (Nom): 5V

  • Max Frequency at normal Voltage: 35Mhz

  • tpd at normal Voltage (Max): 100 nsec

  • Configuration: 4:7

  • Type: Open-Collector

  • IOL (Max): 3.2mA

  • IOH (Max): -0.05mA

  • Rating: Catalog

  • Operating temperature range (C): 0 to 70

  • Bits (#): 7

  • Digital input leakage (Max): 5uA

  • ESD CDM (kV): 0.75

  • ESD HBM (kV): 2

74LS47 Parameter

Manufacturer: Texas Instruments
Series: -
Packaging: Tube
Part Status: Active
Display Type: LED
Configuration: 7 Segment
Interface: BCD
Digits or Characters: -
Current - Supply: 7mA
Voltage - Supply: 4.75V ~ 5.25V
Operating Temperature: 0°C ~ 70°C
Mounting Type: Through Hole
Package / Case: 16-DIP (0.300" 7.62mm)
Supplier Device Package: 16-PDIP
Base Part Number: SN74LS47

74LS47 Application Circuits

74LS47 has integral ripple-blanking facilities, but does not include data latches.


Figure 1 shows the functional diagrams and pin designations of these devices, each of which is housed in a 16-pin package.

74ls47 functional diagram

Figure 1. Functional diagram of the 74LS47 BCD-to-seven-segment decoder/driver ICs.


The 74LS47 has active-low outputs designed to drive a common-anode LED display via external current-limiting resistors (Rx) as shown in Figure 2.

74ls47 application circuit

Figure 2. Basic way of using a 74LS47 IC to drive a common-anode LED display.


Note: Figure 1 shows that each of these ICs has three input 'control' terminals, which are designated LT (Lamp Test), BI/RBO, and RBI. The LT terminal drives all display outputs when the terminal is connected to logic 0 with the RBO terminal open or to logic 1.


When the BI/RBO terminal is pulled low, all outputs are cleared; this pin also functions as a ripple-blanking output terminal. Figure 3 shows how to connect the ripple-blanking terminals to the leading zero suppression on the first three digits of the four-digit display.

74ls47 apllication circuit

Figure 3. Method of applying leading-zero suppression to the first three digits of a four-digit display using 74LS47 ICs.

74LS47 Package

74ls47 package

74LS47 Manufacturer


Texas Instruments Inc. (TI) is an American technology company that designs and manufactures semiconductors and various integrated circuits, which it sells to electronics designers and manufacturers globally. Its headquarters are in Dallas, Texas, United States. TI is one of the top ten semiconductor companies worldwide, based on sales volume. Texas Instruments's focus is on developing analog chips and embedded processors, which accounts for more than 80% of their revenue. TI also produces TI digital light processing (DLP) technology and education technology products including calculators, microcontrollers and multi-core processors. To date, TI has more than 43,000 patents worldwide.

Component Datasheet

74LS47 Datasheet


  • What is the function of IC 7447?

BCD Seven Segment Display Using IC 7447. A decoder is one kind of combinational logic circuit that connects the binary data from n-input lines toward 2n output lines. The IC7447 IC is a BCD to seven segment decoder.

  • What type of display will the 74LS47 drive?

Common-anode LED display. The 74LS47 has active-low outputs designed for driving a common-anode LED display via external current-limiting resistors (Rx), as shown in Figure 2. FIGURE 2. Basic way of using a 74LS47 IC to drive a common-anode LED display.

  • What is BCD to 7 segment decoder?

BCD to seven segment decoder is a circuit used to convert the input BCD into a form suitable for the display. It has four input lines (A, B, C and D) and 7 output lines (a, b, c, d, e, f and g).

  • How do you display a 7 segment?

The displays common pin is generally used to identify which type of 7-segment display it is. As each LED has two connecting pins, one called the “Anode” and the other called the “Cathode”, there are therefore two types of LED 7-segment display called: Common Cathode (CC) and Common Anode (CA).


Ordering & Quality

Photo Mfr. Part # Company Description Package PDF Qty Pricing
SN74LS47N SN74LS47N Company:Texas Instruments Remark:IC DRVR 7 SEGMENT 16DIP Package:16-DIP (0.300", 7.62mm)
In Stock:10875
1+: $0.68000
10+: $0.59400
25+: $0.55800
100+: $0.45540
250+: $0.42300
500+: $0.36000
1000+: $0.28800
2500+: $0.26100
5000+: $0.24300

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