Overview
The SN74LS221DRE4 is a monostable Multivibrator made by Texas Instruments in a SOIC-16 package with 16 pins. 0℃~+70℃ 2 4.75V~5.25V 400uA 45ns 8mA Monostable Reset input、Adjustable pulse width、Dual edge triggering SOIC-16 Monostable Multivibrators ROHS.
PCBKit's library has its KiCad symbol (74xx:74LS221, 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. JLCPCB lists it (part C2675238).
Symbol
Footprint
Parameters
8- Current - Output High(IOH)
- 400uA
- Current - Output Low(IOL)
- 8mA
- Function
- Adjustable pulse width；Reset input；Dual edge triggering
- Logic Type
- Monostable
- Number Of Channels
- 2
- Operating Temperature
- 0℃~+70℃
- Propagation Delay
- 45ns
- Voltage - Supply
- 4.75V~5.25V
Order codes
1- SN74LS221DRE4LCSC C2675238
Pinout
16| Pin | Name | Type |
|---|---|---|
| 1 | A | Input |
| 2 | B | Input |
| 3 | CLR | Input |
| 4 | Q | Output |
| 5 | Q | Output |
| 6 | Cext | Input |
| 7 | RCext | Input |
| 8 | GND | Power in |
| 9 | A | Input |
| 10 | B | Input |
| 11 | CLR | Input |
| 12 | Q | Output |
| 13 | Q | Output |
| 14 | Cext | Input |
| 15 | RCext | Input |
| 16 | VCC | Power in |
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Is there a KiCad symbol and footprint for the SN74LS221DRE4?
Yes. The symbol is 74xx:74LS221 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 SN74LS221DRE4?
SOIC-16, with 16 pins. Its footprint is drawn on this page.
Where is the SN74LS221DRE4 datasheet?
Texas Instruments publishes it: the Datasheet link on this page opens it.
Where can I order the SN74LS221DRE4?
JLCPCB lists it as part C2675238, with 0 in stock; the sellers' links on this page open their listings.
What can replace the SN74LS221DRE4?
Parts like it in the library: the 74HC123D by Nexperia, the CD14538BM96 by Texas Instruments, the CD4528BM/TR by HGSEMI and the CD4538BM(LX) by lingxingic. Check their datasheets: a part that fits the footprint may still differ in its ratings.
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