Overview
The CD74HC688EX is a digital Comparator made by Texas Instruments in a PDIP-20 package with 20 pins. -55℃~+125℃ 29ns@6V,50pF 2V~6V 5.2mA 5.2mA 8 8uA A=B Active Low PDIP-20 Digital Comparators.
PCBKit's library has its KiCad symbol (74xx:74HC688, from KiCad's library) and its footprint (Package_DIP:DIP-20_W8.89mm_SMDSocket_LongPads, from KiCad's library), ready for a KiCad board. JLCPCB lists it (part C3658590).
Symbol
Footprint
Order codes
1- CD74HC688EXLCSC C3658590
Pinout
20| Pin | Name | Type |
|---|---|---|
| 1 | G | Input |
| 2 | P0 | Input |
| 3 | R0 | Input |
| 4 | P1 | Input |
| 5 | R1 | Input |
| 6 | P2 | Input |
| 7 | R2 | Input |
| 8 | P3 | Input |
| 9 | R3 | Input |
| 10 | GND | Power in |
| 11 | P4 | Input |
| 12 | R4 | Input |
| 13 | P5 | Input |
| 14 | R5 | Input |
| 15 | P6 | Input |
| 16 | R6 | Input |
| 17 | P7 | Input |
| 18 | R7 | Input |
| 19 | P=R | Output |
| 20 | VCC | Power in |
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Is there a KiCad symbol and footprint for the CD74HC688EX?
Yes. The symbol is 74xx:74HC688 and the footprint Package_DIP:DIP-20_W8.89mm_SMDSocket_LongPads, both drawn on this page. PCBKit places them on a board for you when you design with it.
What package is the CD74HC688EX?
PDIP-20, with 20 pins. Its footprint is drawn on this page.
Where is the CD74HC688EX datasheet?
Texas Instruments publishes it: the Datasheet link on this page opens it.
Where can I order the CD74HC688EX?
JLCPCB lists it as part C3658590, with 0 in stock; the sellers' links on this page open their listings.
What can replace the CD74HC688EX?
Parts like it in the library: the SN74LS688N by Texas Instruments, the SN74HC682N by Texas Instruments, the DM74ALS520N by onsemi and the 74HC688P-E by Renesas Electronics. Check their datasheets: a part that fits the footprint may still differ in its ratings.
Parts like it
8
SN74LS688N
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PDIP-200℃~+70℃ 2.6mA 20ns@5V,50pF 24mA 4.5V~5.5V 8 A=B Active Low PDIP-20 Digital Comparators ROHSTexas InstrumentsDigital Comparators