2 layers245.1 × 160 mm
8-Bit CPU 32k
slu4coder/Minimal-64x4-Home-Computer
My DIY TTL home computer with VGA and PS/2 and 4x the processing power of a Commodore C64 or Apple II.
139 parts326
Overview
The 74HC161S is a counters, Divider made by GR in a SOP-16 package with 16 pins. 0℃~+70℃ 20MHz 2V~6V 4 500mW Asynchronous Hexadecimal Counter Rising Edge Synchronous Up Counter SOP-16 Counters, Dividers ROHS.
PCBKit's library has its KiCad symbol (74xx:74LS161, from KiCad's library) and its footprint (Package_SO:SOIC-16_3.9x9.9mm_P1.27mm, from KiCad's library), ready for a KiCad board. 671 are in stock at JLCPCB (part C22357610). 64 open-source boards in 43 repositories on GitHub use it.
Symbol
Footprint
Parameters
14- Count Rate
- 20MHz
- Direction
- Up Counter
- Features
- Synchronous counting
- Logic Type
- Hexadecimal Counter
- Number of Elements
- 4
- Operating Temperature
- 0℃~+70℃
- Power Dissipation
- 500mW
- Propagation Delay
- 25ns@5V,16pF
- Reset
- Asynchronous
- Resolution
- 4
- Series
- 74HC
- Timing
- Synchronous
- Trigger Type
- Rising Edge
- Voltage - Supply
- 2V~6V
Order codes
1- 74HC161SLCSC C22357610
Pinout
16| Pin | Name | Type |
|---|---|---|
| 1 | MR | Input |
| 2 | CP | Input |
| 3 | D0 | Input |
| 4 | D1 | Input |
| 5 | D2 | Input |
| 6 | D3 | Input |
| 7 | CEP | Input |
| 8 | GND | Power in |
| 9 | PE | Input |
| 10 | CET | Input |
| 11 | Q3 | Output |
| 12 | Q2 | Output |
| 13 | Q1 | Output |
| 14 | Q0 | Output |
| 15 | TC | Output |
| 16 | VCC | Power in |
Open-source boards using it
All 64- 2 layers191.8 × 121.3 mm
8-Bit CPU 32k
slu4coder/Minimal-UART-Computer-1-2
Legacy: Version 1 and 2 of my TTL-only CPU featuring UART I/O, an expansion port, 512KB SSD at up to 10MHz clock speed
109 parts184 - 2 layers306.1 × 130.2 mm
8-Bit CPU 32k
slu4coder/Minimal-64-Home-Computer
Legacy: Full TTL-only home computer with VGA and PS/2 and twice the processing power of a Commodore 64
132 parts94 - 2 layers100 × 75 mm
RTSS Power Supply V2-5C
RadioThermal/RadioThermal_Soldering_OSHW
Open Source Hardware 470KHz Induction Soldering Iron
69 parts84CERN-OHL-P-2.0 - 2 layers208.9 × 170.8 mm
8-Bit CPU 32k
slu4coder/Minimal-UART-Computer-3
Version 3 of my educational DIY TTL computer built around a UART serial interface - now with blinkenlights!
207 parts54 - 2 layers99.7 × 63.9 mm
NES CN ROM-256-05
emeargt/nes-cnrom
KiCad project for NES-CN-ROM-256-05 cartridge schematic and PCB
17 parts31CC-BY-SA-4.0 - 2 layers208 × 110 mm
- 4 layers158.8 × 104.1 mm
Show this part on your page
<iframe src="https://pcbkit.io/embed/parts/gr/74HC161S" title="74HC161S in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe><img src="https://pcbkit.io/embed/parts/gr/74HC161S.jpg" alt="74HC161S" width="1200" height="900">[](https://pcbkit.io/parts/gr/74HC161S)Questions
Is there a KiCad symbol and footprint for the 74HC161S?
Yes. The symbol is 74xx:74LS161 and the footprint Package_SO:SOIC-16_3.9x9.9mm_P1.27mm, both drawn on this page. PCBKit places them on a board for you when you design with it.
What package is the 74HC161S?
SOP-16, with 16 pins. Its footprint is drawn on this page.
Where is the 74HC161S datasheet?
GR publishes it: the Datasheet link on this page opens it.
Where can I order the 74HC161S?
JLCPCB lists it as part C22357610, with 671 in stock; the sellers' links on this page open their listings.
What can replace the 74HC161S?
Parts like it in the library: the CD4017BM96 by Texas Instruments, the HEF4060BT by Nexperia, the MC14060BD by onsemi and the CD4060BDTR(XBLW) by XBLW. Check their datasheets: a part that fits the footprint may still differ in its ratings.
Which open-source boards use the 74HC161S?
64 boards in 43 repositories on GitHub; the most starred are listed on this page, with their KiCad files.
Parts like it
8
CD4017BM96
SOIC-16-55℃~+125℃ 1 135ns 3V~18V 5.5MHz Asynchronous Divide-by-10 Rising Edge Up Counter SOIC-16 Counters, Dividers ROHSTexas InstrumentsCounters, DividersHEF4060BT
SOP-16-40℃~+85℃ 1 210ns 30MHz 3V~15V Asynchronous Divide-by-2 Falling Edge SOIC-16 Counters, Dividers ROHSNexperiaCounters, DividersMC14060BD
SOIC-16-55℃~+125℃ 0.4us 1 14 17MHz 3V~18V 500mW Asynchronous Divide-by-2 Falling Edge MC14060B Reset function、Static operation Up Counter SOIC-16 Counters, Dividers ROHSonsemiCounters, DividersCD4060BDTR(XBLW)
SOP-16-40℃~+85℃ 100ns 12MHz 3V~15V 500mW Asynchronous Asynchronous Binary Counter Falling Edge Reset function、Static operation SOP-16 Counters, Dividers ROHSXBLWCounters, Dividers74HC40103D,653
SOIC-16-40℃~+125℃ 1 2V~6V 32MHz 35ns 500mW 8 Asynchronous Divide-by-2 Down Counter Rising Edge Synchronous SOIC-16 Counters, Dividers ROHSNexperiaCounters, DividersCD4060BM96
SOIC-16-55℃~+125℃ 1 100ns 12MHz 3V~18V Asynchronous Divide-by-2 Falling Edge Up Counter SOIC-16 Counters, Dividers ROHSTexas InstrumentsCounters, Dividers74HC161M/TR
SOP-16-40℃~+85℃ 18ns 2V~6V 36MHz 4 500mW 74HC Asynchronous Binary Counter Reset function、Cascade counter、Synchronous counting Rising Edge Synchronous SOP-16 Counters, Dividers ROHSHGSEMICounters, DividersHEF4017BT(LX)
SOP-16-40℃~+85℃ 1 11MHz 3V~15V 500mW 85ns Asynchronous Divide-by-10 HEF Reset function、Cascade counter、Auto calibration Rising Edge Up Counter SOP-16 Counters, Dividers ROHSlingxingicCounters, Dividers