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Texas Instruments SN74LS40N Dual 4-Input NAND Buffer LS TTL 14-Pin DIP IC 74LS40
Texas Instruments SN74LS40N Dual 4-Input NAND Buffer LS TTL 14-Pin DIP IC 74LS40
Regular price
$3.99 USD
Regular price
Sale price
$3.99 USD
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10 in stock
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ITEM SPECIFICS
Brand: Texas Instruments
MPN: SN74LS40N
Series: 74LS
Type: Dual 4-Input Positive-NAND Buffer
Logic Technology: Low-Power Schottky TTL
Number of Gates: 2
Inputs per Gate: 4
Supply Voltage: 5 V Nominal
Operating Temperature: 0°C to +70°C
Package: 14-Pin Plastic DIP (N)
Mounting Type: Through Hole
Additional Visible Markings: MALAYSIA / 618AS / H1 (underside)
Country of Manufacture: Malaysia
Quantity: 1
Condition: New
DESCRIPTION
Texas Instruments SN74LS40N dual 4-input positive-NAND buffer in a 14-pin plastic dual in-line package. The photographed unit carries the TI logo with the SN74LS40N, MALAYSIA, and 618AS markings, plus H1 molded on the underside.
Features:
Two independent 4-input NAND buffer gates.
Buffer outputs for driving higher loads than standard LS gates.
Low-power Schottky TTL.
Commercial temperature range, 0°C to +70°C.
14-pin plastic DIP for through-hole mounting.
Compatibility:
Direct replacement for SN74LS40N, 74LS40N, and 74LS40 in 14-pin sockets designed for the 7440 pinout. The SN7440, SN74S40, and SN74ALS40A share the same dual 4-input NAND buffer function in other logic families. Check speed and drive requirements before substituting across families. Common in line driving and clock distribution on vintage computer, arcade, and test equipment boards.
Q&A:
Q: What does the 74LS40 do?
A: It contains two 4-input NAND gates with buffered outputs. Each output goes low only when all four inputs are high.
Q: Can I use a 74LS20 instead?
A: The 74LS20 is also a dual 4-input NAND, but it is not a buffer and has lower output drive. Use the 74LS40 where the circuit needs the higher drive.
Q: Is this a genuine TI part?
A: Yes. It is marked with the Texas Instruments logo and SN74LS40N part number, as shown in the photos.
Troubleshooting:
Check 5 V at VCC (pin 14) and ground at pin 7.
Tie unused inputs high. Do not leave TTL inputs floating.
Confirm each output goes low only when all four of its inputs are high.
DISCLAIMER
Please review all photos and specifications before purchasing, and make sure this part is right for your application. Item is sold as shown in the photos.
LEGAL DISCLAIMER
American Industrial Parts Group is not an authorized distributor, reseller, or representative of Texas Instruments. All product names, trademarks, brands, and logos are the property of their respective owners and are used for identification purposes only. As an independent reseller, the original manufacturer warranty does not apply.
SN74LS40N, SN74LS40, 74LS40N, 74LS40, Texas Instruments SN74LS40N, TI 74LS40, dual 4-input NAND buffer, NAND buffer IC, 4-input NAND gate, 7440, SN7440, 74S40, 74ALS40, LS TTL logic IC, 14-pin DIP IC, vintage TI IC, arcade board repair IC, vintage computer repair IC.
Thank you for shopping with American Industrial Parts Group!
Brand: Texas Instruments
MPN: SN74LS40N
Series: 74LS
Type: Dual 4-Input Positive-NAND Buffer
Logic Technology: Low-Power Schottky TTL
Number of Gates: 2
Inputs per Gate: 4
Supply Voltage: 5 V Nominal
Operating Temperature: 0°C to +70°C
Package: 14-Pin Plastic DIP (N)
Mounting Type: Through Hole
Additional Visible Markings: MALAYSIA / 618AS / H1 (underside)
Country of Manufacture: Malaysia
Quantity: 1
Condition: New
DESCRIPTION
Texas Instruments SN74LS40N dual 4-input positive-NAND buffer in a 14-pin plastic dual in-line package. The photographed unit carries the TI logo with the SN74LS40N, MALAYSIA, and 618AS markings, plus H1 molded on the underside.
Features:
Two independent 4-input NAND buffer gates.
Buffer outputs for driving higher loads than standard LS gates.
Low-power Schottky TTL.
Commercial temperature range, 0°C to +70°C.
14-pin plastic DIP for through-hole mounting.
Compatibility:
Direct replacement for SN74LS40N, 74LS40N, and 74LS40 in 14-pin sockets designed for the 7440 pinout. The SN7440, SN74S40, and SN74ALS40A share the same dual 4-input NAND buffer function in other logic families. Check speed and drive requirements before substituting across families. Common in line driving and clock distribution on vintage computer, arcade, and test equipment boards.
Q&A:
Q: What does the 74LS40 do?
A: It contains two 4-input NAND gates with buffered outputs. Each output goes low only when all four inputs are high.
Q: Can I use a 74LS20 instead?
A: The 74LS20 is also a dual 4-input NAND, but it is not a buffer and has lower output drive. Use the 74LS40 where the circuit needs the higher drive.
Q: Is this a genuine TI part?
A: Yes. It is marked with the Texas Instruments logo and SN74LS40N part number, as shown in the photos.
Troubleshooting:
Check 5 V at VCC (pin 14) and ground at pin 7.
Tie unused inputs high. Do not leave TTL inputs floating.
Confirm each output goes low only when all four of its inputs are high.
DISCLAIMER
Please review all photos and specifications before purchasing, and make sure this part is right for your application. Item is sold as shown in the photos.
LEGAL DISCLAIMER
American Industrial Parts Group is not an authorized distributor, reseller, or representative of Texas Instruments. All product names, trademarks, brands, and logos are the property of their respective owners and are used for identification purposes only. As an independent reseller, the original manufacturer warranty does not apply.
SN74LS40N, SN74LS40, 74LS40N, 74LS40, Texas Instruments SN74LS40N, TI 74LS40, dual 4-input NAND buffer, NAND buffer IC, 4-input NAND gate, 7440, SN7440, 74S40, 74ALS40, LS TTL logic IC, 14-pin DIP IC, vintage TI IC, arcade board repair IC, vintage computer repair IC.
Thank you for shopping with American Industrial Parts Group!
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