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Texas Instruments SN74S140D — Logic ICs

SN74S140D 74S Dual 4-Input NAND Gate, 6 ns Propagation Delay

MPNSN74S140D
End of Life

Texas Instruments 74S series, SN74S140D, dual 4-input NAND gate, 6 ns propagation delay at 5V/150pF, 40 mA low / 60 mA high output current, 4.75V–5.25V supply, 0°C to 70°C, 14-SOIC package.

$3.26Ref. price · indicative, final on quote
Texas Instruments SN74S140D datasheet (PDF)
Packaging14-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Series74S
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN74S140D specifications
ParameterValue
Series74S
Logic typeNAND Gate
MountingSurface Mount
Supply voltage4.75V ~ 5.25V
Current - output high, low40mA, 60mA
I/O channels4
Operating temperature0°C ~ 70°C
PackageTube
Case14-SOIC (0.154\", 3.90mm Width)
Number of circuits2
Input logic level - low0.8V
Input logic level - high2V
Max propagation delay @ v, max CL6ns @ 5V, 150pF

Product details

Dual 4-input NAND gate in the 74S family

It integrates two independent NAND gates, each with four inputs, and operates from a 4.75V to 5.25V supply rail. The 74S series uses Schottky-clamped transistors to achieve higher switching speeds than standard 74LS, with a typical propagation delay of 6 ns at 5V and a 150 pF load. Output drive capability is 40 mA sinking and 60 mA sourcing, which is notably higher than many other 74-series gates — useful for driving multiple fan-out loads or long PCB traces without a buffer.

Output drive: 40 mA low, 60 mA high

The SN74S140D can sink 40 mA and source 60 mA per output.

Frequently asked questions

What is the propagation delay of SN74S140D?

The maximum propagation delay is 6 ns at 5V supply with a 150 pF load. This is the worst-case spec; actual delay with lighter loads (typical CMOS inputs) will be shorter.

What is the equivalent of SN74S140D?

No official second-source alternate is listed. For a functional equivalent, the SN74F00DR (74F quad 2-input NAND) offers similar speed (5 ns) but lower output drive and a different input count. The SN74ALS11ANS (74ALS triple 3-input AND) is a different logic function. For a drop-in dual 4-input NAND, the SN74S140D itself is the direct choice.