4 layers113 × 69 mm
VideoMacPac
apmcpherson/VideoMacPacHack
Clone of the Video Mac Pac PDS video card for the Macintosh Portable
30 parts27
Overview
The 74F521PC is a digital Comparator made by onsemi in a PDIP-20 package with 5 pins. 0℃~+70℃ 10ns@5V,50pF 1mA 20mA 4.5V~5.5V 8 A=B Active Low Multi-device cascading PDIP-20 Digital Comparators ROHS.
PCBKit's library has its footprint (Package_DIP:DIP-20_W8.89mm_SMDSocket_LongPads, from KiCad's library), ready for a KiCad board. JLCPCB lists it (part C3717417). 8 open-source boards in 4 repositories on GitHub use it.
Symbol
The library has no symbol for this part yet.
Footprint
Order codes
1- 74F521PCLCSC C3717417
Open-source boards using it
All 8- 2 layers150 × 150 mm
- 4 layers254 × 134.6 mm
Z280-S100
cm68/Z280-S100
16-bit Zilog Z280 CPU card for the IEEE-696 S-100 backplane; glue logic in two ATF1508AS CPLDs
61 parts1CERN-OHL-P-2.0 - 2 layers101.6 × 101.6 mm
- 2 layers101.6 × 101.6 mm
- 2 layers101.6 × 101.6 mm
- 2 layers101.6 × 101.6 mm
- 4 layers101.6 × 101.6 mm
Show this part on your page
<iframe src="https://pcbkit.io/embed/parts/onsemi/74F521PC" title="74F521PC in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe><img src="https://pcbkit.io/embed/parts/onsemi/74F521PC.jpg" alt="74F521PC" width="1200" height="900">[](https://pcbkit.io/parts/onsemi/74F521PC)Questions
Is there a KiCad symbol and footprint for the 74F521PC?
Yes. 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 74F521PC?
PDIP-20, with 5 pins. Its footprint is drawn on this page.
Where is the 74F521PC datasheet?
onsemi publishes it: the Datasheet link on this page opens it.
Where can I order the 74F521PC?
JLCPCB lists it as part C3717417, with 0 in stock; the sellers' links on this page open their listings.
What can replace the 74F521PC?
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.
Which open-source boards use the 74F521PC?
8 boards in 4 repositories on GitHub; the most starred are listed on this page, with their KiCad files.
Parts like it
8
SN74LS688N
PDIP-200℃~+70℃ 23ns@5V,45pF 24mA 4.85V~5.25V 400uA 8 A=B Active Low Hysteresis comparison PDIP-20 Digital Comparators ROHSTexas InstrumentsDigital ComparatorsSN74HC682N
PDIP-20-40℃~+85℃ 2V~6V 47ns@6V,50pF 5.2mA 5.2mA 8 A=B,A>B Active Low PDIP-20 Digital Comparators ROHSTexas InstrumentsDigital ComparatorsDM74ALS520N
PDIP-200℃~+70℃ 2.6mA 20ns@5V,50pF 24mA 4.5V~5.5V 8 A=B Active Low Multi-device cascading PDIP-20 Digital Comparators ROHSonsemiDigital Comparators74HC688P-E
DIP-20-40℃~+125℃ 29ns@6V,50pF 2V~6V 5.2mA 5.2mA 8 8uA A=B Active Low Multi-device cascading DIP-20 Digital Comparators ROHSRenesas ElectronicsDigital Comparators74HCT688P-E
DIP-20-40℃~+125℃ 34ns@4.5V,50pF 4.5V~5.5V 4mA 4mA 8 8uA A=B Active Low Multi-device cascading DIP-20 Digital Comparators ROHSRenesas ElectronicsDigital ComparatorsCD74HC688EX
PDIP-20-55℃~+125℃ 29ns@6V,50pF 2V~6V 5.2mA 5.2mA 8 8uA A=B Active Low PDIP-20 Digital ComparatorsTexas InstrumentsDigital ComparatorsCD74HCT688EE4
PDIP-20Multi-device cascading PDIP-20 Digital Comparators ROHSTexas InstrumentsDigital ComparatorsSN74ALS518N
PDIP-200℃~+70℃ 100uA 24mA 33ns@5V,50pF 4.5V~5.5V 8 A=B Active High PDIP-20 Digital Comparators ROHSTexas InstrumentsDigital Comparators