CD4028 BCD-to-Decimal Decoder


CD4028 belongs to 4000 Series CMOS Logic Family of Integrated Circuits (IC’s) constructed with N- and P-channel enhancement mode transistors. CD4028 has BCD-to-Decimal Decoder

CD4028 has a supply voltage range of 5V to 20V, which is much higher than any contemporary logic family. It has buffered output which improves transfer characteristics by providing very high gain. All inputs are protected against static discharge with diodes to VDD and VSS.

CD4028 Features

  • High-Voltage Types (20V Rating)
  • BCD-to-Decimal Decoding or Binary-to-Octal Decoding
  • High Decoded Output Drive Capability
  • Standard Symmetrical Output Characteristics
  • 100% Tested for Maximum Quiescent Current at 20V
  • 5V, 10V, and 15V Parametric Ratings
  • Maximum Input Current of 1μA at 18V Over Full Package Temperature Range; 100nA at 18V and +25oC
  • Noise Margin (Over Full Package Temperature Range):
    • 1V at VDD = 5V
    • 2V at VDD = 10V
    • 2.5V at VDD = 15V

CD4028 Specifications

Absolute Maximum Ratings

  • DC Supply Voltage Range, (VDD): -0.5V to +20V (Voltage Referenced to VSS Terminals)
  • Input Voltage Range, All Inputs: -0.5V to VDD +0.5V
  • DC Input Current, Any One Input: ±10mA
  • Operating Temperature Range: -55oC to +125oC Package Types D, F, K, H
  • Storage Temperature Range (TSTG): -65oC to +150oC
  • Lead Temperature (During Soldering): +265oC
    • At Distance 1/16 ± 1/32 Inch (1.59mm ± 0.79mm) from case for 10s Maximum

CD4028 Pinout Diagram

CD4028 Pin Description

Pin NoPin NameDescription
14Decimal Decoded Output 4
22 Decimal Decoded Output 1
30 Decimal Decoded Output 0
47 Decimal Decoded Output 7
59 Decimal Decoded Output 9
65 Decimal Decoded Output 5
76 Decimal Decoded Output 6
8VSSSupply Voltage
98 Decimal Decoded Output 8
10ABCD Input Pin A
11D BCD Input Pin D
12C BCD Input Pin C
13B BCD Input Pin B
141 Decimal Decoded Output 1
153 Decimal Decoded Output 3
16VDDDrain Voltage

CD4028 Circuit


  • Code Conversion
  • Indication-Tube Decoder
  • Address Decoding – Memory Selection Control

CD4028 Alternative Equivalent


Download CD4028 BCD-to-Decimal Decoder Datasheet from the link given below.