# CD74ACT161M96

**Texas Instruments** · Counters, Dividers · SOIC-16

CD74ACT161M96 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 | CLR | input | Asynchronous clear input; low level sets all four flip-flop outputs low regardless of other inputs. |
| 2 | CLK | input | Buffered clock input; triggers the four flip-flops on the rising edge of the clock waveform. |
| 3 | A | input | Preset data input A; defines the preset value for output bit A when LOAD is low. |
| 4 | B | input | Preset data input B; defines the preset value for output bit B when LOAD is low. |
| 5 | C | input | Preset data input C; defines the preset value for output bit C when LOAD is low. |
| 6 | D | input | Preset data input D; defines the preset value for output bit D when LOAD is low. |
| 7 | ENP | input | Parallel count enable input; counter counts only when both ENP and ENT are high. |
| 8 | GND | power_in | Ground; 0 V reference voltage. |
| 9 | LOAD | input | Load input; low level synchronously presets counter outputs to match preset data inputs on next clock pulse. |
| 10 | ENT | input | Terminal count enable input; counter counts when both ENP and ENT are high; fed forward to enable RCO. |
| 11 | QD | output | 4-bit binary counter output bit D (most significant bit). |
| 12 | QC | output | 4-bit binary counter output bit C. |
| 13 | QB | output | 4-bit binary counter output bit B. |
| 14 | QA | output | 4-bit binary counter output bit A (least significant bit). |
| 15 | RCO | output | Ripple-carry output; produces high-level pulse when counter reaches terminal count (maximum value) and ENT is high. |
| 16 | VCC | power_in | Positive supply voltage; 4.5 V to 5.5 V recommended operating range. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Logic |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `CD74ACT161M96`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files: `cd74act161m96-etched.step` / `cd74act161m96-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cd74act161m96.step` / `cd74act161m96.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/cd74act161) (18 pp, sha256 `131692bc612740db`, retrieved 2026-10-07, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-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).

[Datasheet PDF](docs/cd74act161m96-datasheet.pdf)