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Texas Instruments SN74HCS21DR — Logic ICs

SN74HCS21DR TI AND Gate, Schmitt Trigger Input, 14-SOIC

MPNSN74HCS21DR
End of Life

Texas Instruments 74HCS series, AND Gate, 2 Circuits, 4 Inputs, Schmitt Trigger Input, 2V to 6V supply, -40°C to 125°C, 14-SOIC surface mount package, Tape & Reel.

$0.35Ref. price · indicative, final on quote
Texas Instruments SN74HCS21DR datasheet (PDF)
Packaging14-SOIC (0.154", 3.90mm Width)
RoHSNot applicable
Series74HCS
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN74HCS21DR specifications
ParameterValue
Series74HCS
Logic typeAND Gate
MountingSurface Mount
Supply voltage2V ~ 6V
Current - quiescent2 µA
Current - output high, low-, 7.8mA
I/O channels4
Operating temperature-40°C ~ 125°C
PackageTape & Reel (TR); Cut Tape (CT)
FeaturesSchmitt Trigger Input
Case14-SOIC (0.154\", 3.90mm Width)
Number of circuits2
Input logic level - low1V ~ 3V
Input logic level - high1.5V ~ 4.2V
Max propagation delay @ v, max CL16ns @ 6V, 50pF

Product details

Dual 4-input AND gate with Schmitt-trigger inputs

The SN74HCS21DR is a dual 4-input AND gate from the 74HCS series with Schmitt-trigger inputs. Supply range is 2V to 6V, operating temperature -40°C to 125°C, quiescent current 2 µA max, propagation delay 16 ns at 6V with 50 pF load.

Active and available — no LTB risk

Surface-mount in a 14-SOIC package (0.154" body width, 3.90 mm). The supplier device package is 14-SOIC, which is the standard SOIC-14 footprint. No special handling beyond standard SMD reflow profiles.

Frequently asked questions

What is the difference between SN74HCS21DR and SN74HC21DR?

The SN74HCS21DR adds Schmitt-trigger inputs and extends the operating temperature range to 125°C, while the SN74HC21DR lacks Schmitt-trigger inputs and is rated only to 85°C. Both are dual 4-input AND gates in the same 14-SOIC footprint and share the same 2V to 6V supply range. The HCS version also has a lower quiescent current (2 µA max vs 8 µA typical for HC).

Is SN74HCS21DR available in tape and reel?

Yes, the SN74HCS21DR is offered in Tape & Reel (TR) and Cut Tape (CT) packaging options, as indicated by the 'DR' suffix in the order code.

Is SN74HCS21DR a Schmitt trigger?

Yes, the SN74HCS21DR has Schmitt-trigger inputs on all four inputs per gate, providing hysteresis for noise rejection and slow-edge conditioning.