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CD4028B BCD-to-Decimal Decoder

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by Ray

BCD-to-decimal (1-of-10) decoder in the 4000B CMOS family, 3 V to 18 V.

logicdecoderbcd4000-seriestisoic-16
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CD4028B

Texas Instruments · Decoder / Demultiplexer · SOIC-16

The CD4028B is a BCD-to-decimal decoder that converts a 4-bit BCD input to one of ten mutually exclusive active-high outputs. Inputs above 9 force all outputs low. Its wide 3 V to 18 V supply range makes it a common decoder for display scanning and 1-of-N selection.

Pinout

Pin Name Type Function
1 4 output Buffered decoded output 4. HIGH when input code DCBA = 0100.
2 2 output Buffered decoded output 2. HIGH when input code DCBA = 0010.
3 0 output Buffered decoded output 0. HIGH when input code DCBA = 0000.
4 7 output Buffered decoded output 7. HIGH when input code DCBA = 0111.
5 9 output Buffered decoded output 9. HIGH when input code DCBA = 1001.
6 5 output Buffered decoded output 5. HIGH when input code DCBA = 0101.
7 6 output Buffered decoded output 6. HIGH when input code DCBA = 0110.
8 VSS power_in Negative supply / ground reference (0 V).
9 8 output Buffered decoded output 8. HIGH when input code DCBA = 1000.
10 A input BCD input A (LSB). Buffered CMOS input; 3-18 V logic levels.
11 D input BCD input D (MSB). Tie LOW for 3-bit binary-to-octal operation.
12 C input BCD input C. Buffered CMOS input; 3-18 V logic levels.
13 B input BCD input B. Buffered CMOS input; 3-18 V logic levels.
14 3 output Buffered decoded output 3. HIGH when input code DCBA = 0011.
15 1 output Buffered decoded output 1. HIGH when input code DCBA = 0001.
16 VDD power_in Positive supply, 3 V to 18 V (absolute max 20 V).

Key specifications

Parameter Value
Type BCD-to-decimal (1-of-10) decoder
Logic family 4000B (CMOS)
Outputs 10, active-high, mutually exclusive
Supply voltage 3 V to 18 V
Operating temperature -55 C to 125 C

Ordering variants

Same part, different packaging or reel option.

  • CD4028BBE
  • CD4028BBE.A
  • CD4028BBEE4
  • CD4028BBF
  • CD4028BBF.A
  • CD4028BBF3A
  • CD4028BBF3A.A
  • CD4028BBM
  • CD4028BBM96
  • CD4028BBM96.A
  • CD4028BBMT
  • CD4028BBNSR
  • CD4028BBNSR.A
  • CD4028BBPW
  • CD4028BBPWR

CAD (KiCad official)

  • Symbol: cd4028.kicad_sym
  • Footprint: cd4028.kicad_mod
  • 3D model: SOIC-16 body from KiCad Package_SO/SOIC-16_3.9x9.9mm_P1.27mm.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (19 pp, sha256 f89c5f50a4af474d, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF