Overview
The SN74LS540DB is an inverter made by Texas Instruments in a SSOP-20 package with 20 pins. 0℃~+70℃ 15mA 15ns@5V,45pF 2.4V~3.4V 24mA 2V 4.75V~5.25V 500mV 52mA 600mV 74LS 8 SSOP-20 Buffers, Drivers, Receivers, Transceivers ROHS.
PCBKit's library has its KiCad symbol (74xx:74LS540, from KiCad's library) and its footprint (Package_SO:SSOP-20_5.3x7.2mm_P0.65mm, from KiCad's library), ready for a KiCad board. 139 are in stock at JLCPCB (part C2877474).
Symbol
Footprint
Parameters
12- Current - Output High(IOH)
- 15mA
- Current - Output Low(IOL)
- 24mA
- Input Logic Level - High
- 2V
- Input Logic Level -Low
- 600mV
- Number of Circuits
- 8
- Operating Temperature
- 0℃~+70℃
- Output Logic Level - High
- 2.4V~3.4V
- Output Logic Level - Low
- 500mV
- Propagation Delay
- 15ns@5V,45pF
- Quiescent Current(Iq)
- 52mA
- Series
- 74LS
- Voltage - Supply
- 4.75V~5.25V
Order codes
1- SN74LS540DBRLCSC C2877474
Pinout
20| Pin | Name | Type |
|---|---|---|
| 1 | G1 | Input |
| 2 | A0 | Input |
| 3 | A1 | Input |
| 4 | A2 | Input |
| 5 | A3 | Input |
| 6 | A4 | Input |
| 7 | A5 | Input |
| 8 | A6 | Input |
| 9 | A7 | Input |
| 10 | GND | Power in |
| 11 | Y7 | Tri-state |
| 12 | Y6 | Tri-state |
| 13 | Y5 | Tri-state |
| 14 | Y4 | Tri-state |
| 15 | Y3 | Tri-state |
| 16 | Y2 | Tri-state |
| 17 | Y1 | Tri-state |
| 18 | Y0 | Tri-state |
| 19 | G2 | Input |
| 20 | VCC | Power in |
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Is there a KiCad symbol and footprint for the SN74LS540DB?
Yes. The symbol is 74xx:74LS540 and the footprint Package_SO:SSOP-20_5.3x7.2mm_P0.65mm, both drawn on this page. PCBKit places them on a board for you when you design with it.
What package is the SN74LS540DB?
SSOP-20, with 20 pins. Its footprint is drawn on this page.
Where is the SN74LS540DB datasheet?
Texas Instruments publishes it: the Datasheet link on this page opens it.
Where can I order the SN74LS540DB?
JLCPCB lists it as part C2877474, with 139 in stock; the sellers' links on this page open their listings.
What can replace the SN74LS540DB?
Parts like it in the library: the SN74AC240DB by Texas Instruments, the SN74AHCT540DB by Texas Instruments and the SN74ABT2240ADB by Texas Instruments. Check their datasheets: a part that fits the footprint may still differ in its ratings.
