component
CD74AC161M
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
markdownCD74AC161M
Texas Instruments · Counters, Dividers · SOIC-16
CD74AC161M 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, active low; sets all Q outputs to low regardless of CLK, LOAD, or enable inputs. |
| 2 | CLK | input | Synchronous clock input, rising edge triggered. |
| 3 | A | input | Data input A for parallel preset operation; loaded to QA when LOAD is low. |
| 4 | B | input | Data input B for parallel preset operation; loaded to QB when LOAD is low. |
| 5 | C | input | Data input C for parallel preset operation; loaded to QC when LOAD is low. |
| 6 | D | input | Data input D for parallel preset operation; loaded to QD when LOAD is low. |
| 7 | ENP | input | Count enable input; ENP and ENT must both be high for counting; does not affect RCO output. |
| 8 | GND | power_in | Ground connection for power return and logic reference. |
| 9 | LOAD | input | Parallel load input, active low; disables counting and loads data A-D to Q outputs on next clock edge. |
| 10 | ENT | input | Count enable input; ENP and ENT must both be high for counting; feed-forward enables RCO at maximum count. |
| 11 | QD | output | Counter output D (most significant bit) for 4-bit binary count. |
| 12 | QC | output | Counter output C for 4-bit binary count. |
| 13 | QB | output | Counter output B for 4-bit binary count. |
| 14 | QA | output | Counter output A (least significant bit) for 4-bit binary count. |
| 15 | RCO | output | Ripple carry output; high pulse when counter reaches maximum (9 or 15) and ENT is high. |
| 16 | VCC | power_in | Power supply input voltage; operating range 1.5V to 5.5V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Logic |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
CD74AC161M - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files:
cd74ac161m-etched.step/cd74ac161m-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cd74ac161m.step/cd74ac161m.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (23 pp, sha256
cc0df0be38defb4e, retrieved 2026-09-27, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-4-6(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).