component
CD74HCT191M
Public Made by Adomby adom
Texas Instruments Counters, Dividers, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownCD74HCT191M
Texas Instruments · Counters, Dividers · SOIC-16
CD74HCT191M from Texas Instruments, in a SOIC-16. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | B | input | Preset data input B for asynchronous parallel load. |
| 2 | QB | output | Counter output QB. |
| 3 | QA | output | Counter output QA. |
| 4 | CTEN | input | Active-low count enable; counting occurs when CTEN is low and LOAD is high, and it should be changed only when the clock is high. |
| 5 | D/U | input | Down/up control; high counts down, low counts up, and it should be changed only when the clock is high. |
| 6 | QC | output | Counter output QC. |
| 7 | QD | output | Counter output QD. |
| 8 | GND | power_in | Ground. |
| 9 | D | input | Preset data input D for asynchronous parallel load. |
| 10 | C | input | Preset data input C for asynchronous parallel load. |
| 11 | LOAD | input | Active-low asynchronous parallel load input that presets the counter to the number on A-D. |
| 12 | MAX/MIN | output | Goes high and stays high for one clock cycle on counter overflow or underflow, usable for look-ahead carry. |
| 13 | RCO | output | Active-low ripple clock output, normally high, goes low for the low-level portion of the clock pulse when MAX/MIN is high, used for cascading. |
| 14 | CLK | input | Clock input; the counter counts on the low-to-high clock transition. |
| 15 | A | input | Preset data input A for asynchronous parallel load. |
| 16 | VCC | power_in | Supply voltage, 4.5-V to 5.5-V operation for the HCT191. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Logic |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
CD74HCT191M - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files:
cd74hct191m-etched.step/cd74hct191m-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cd74hct191m.step/cd74hct191m.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (34 pp, sha256
c9b6587e141f0d79, retrieved 2026-10-06, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(vision), consensusclaude-opus-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).