CD4028B BCD-to-Decimal Decoder

@@ -0,0 +1,70 @@+# 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++- `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](https://www.ti.com/lit/ds/symlink/cd4028b.pdf) (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](docs/cd4028-datasheet.pdf)

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